Updated on 2023/07/19

写真a

 
NAKANISHI Kazuki
 
Organization
Institute of Materials and Systems for Sustainability Division of Materials Research (DM) Professor
Graduate School
Graduate School of Engineering
Title
Professor

Degree 1

  1. Doctor (Engineering) ( 1991.9   Kyoto University ) 

Research Interests 1

  1. ゾル-ゲル法

Research Areas 3

  1. Nanotechnology/Materials / Inorganic compounds and inorganic materials chemistry

  2. Nanotechnology/Materials / Inorganic materials and properties

  3. Nanotechnology/Materials / Inorganic materials and properties

Current Research Project and SDGs 1

  1. Development of super thermal-insulating materials based on low-density porous materials

Research History 9

  1. Kyoto University

    2019.8

      More details

    Country:Japan

  2. Kyoto University   Institute for Integrated Cell-Material Sciences   Program-Specific Professor

    2019.8

      More details

    Country:Japan

    Notes:Cross Appointment

  3. Nagoya University   Institute of Materials and Systems for Sustainability   Professor

    2019.1

      More details

    Country:Japan

  4. University of Montpellier 2   Institute of Charles Gerhardt   Visiting Professor

    2011.9

      More details

    Country:Japan

  5. Kyoto University   Graduate School of Science   Associate professor

    2005.5 - 2018.12

      More details

    Country:Japan

  6. 科学技術振興機構   さきがけ研究研究員

    2000.10 - 2003.9

      More details

    Country:Japan

  7. Johannes Gutenberg University, Mainz   Department of Inorganic and Analytical Chemistry   Designated professor

    2000.9 - 2000.11

      More details

    Country:Germany

  8. Kyoto University   Graduate School of Engineering   Associate Professor

    1995.7 - 2005.6

      More details

    Country:Japan

  9. Kyoto University   Faculty of Engineering   Assistant

    1986.7 - 1995.6

      More details

    Country:Japan

▼display all

Education 2

  1. Kyoto University

    1979.4 - 1983.3

      More details

    Country: Japan

  2. Kyoto University   Graduate School, Division of Engineering   Industrial Chemistry

    1983.4 - 1985.3

      More details

    Country: Japan

Professional Memberships 7

  1. Japanese Sol-Gel Society   President

    2019.8

  2. International Sol-Gel Society   Fellow

    2019.8

  3. Japan Society of Powder and Powder Metallurgy

  4. Chemical Society of Japan   Member

  5. Society of Polymer Science Japan   Member

  6. アメリカセラミックス学会

  7. Ceramic Society Japan

▼display all

Awards 9

  1. D. R. Ulrich Award

    1997.8   9th International Workshop on Glasses, Ceramics, Hybrids and Nanocomposites from Gels   For outstanding work in the field of sol-gel science and technology

    Kazuki Nakanishi

     More details

    Award type:Award from international society, conference, symposium, etc.  Country:United Kingdom

  2. Professor Vittorio Gottardi Memorial Prize

    1999.6   International Commission on Glass   Outstanding individual accomplishments in the field of glass

    Kazuki Nakanishi

     More details

    Award type:Award from international society, conference, symposium, etc.  Country:Czech Republic

  3. 日本セラミックス協会 学術賞

    2006.5   日本セラミックス協会   相分離を伴うゾル-ゲル法による機能性多孔材料の開発

    中西 和樹

     More details

    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  4. 平成22年度科学技術分野の文部科学大臣表彰 科学技術賞(研究部門)

    2010.4   文部科学省   シリカモノリスの構造制御とHPLCの高 性能化に関する研究

    田中信男,水口博義,中西和樹

     More details

    Country:Japan

  5. 大学発ベンチャー表彰2017 経済産業大臣賞

    2017.8   科学技術振興機構(JST)   ティエムファクトリ、YKK APとの透明断熱材の開発

    山地正洋、東克起、中西和樹

     More details

    Country:Japan

  6. ISGS Fellow

    2019.8   International Sol-Gel Society  

     More details

    Country:United States

  7. Lifetime Achievement Award

    2021.9   International Sol-Gel Society   Outstanding contributions to sol-gel science and technology

    Kazuki Nakanishi

     More details

    Award type:Award from international society, conference, symposium, etc.  Country:United States

    Outstanding contributions to sol-gel science and technology through broad and productive scholarship; by achievements in commercial and industrial applications of sol-gel science and technology; and/or by outstanding service to the sol-gel community that has been sustained over an entire career

  8. ISGS Lifetime Achievement Award

    2021.9   International Sol-Gel Society   Outstanding contributions to sol-gel science and technology through broad and productive scholarship

    Kazuki Nakanishi

  9. D. R. Ulrich Award (Sol-Gel '97)

    1997.9   International Sol-Gel Society  

    NAKANISHI Kazuki

▼display all

 

Papers 377

  1. Fabrication process development and basic evaluation of eggshell-based column packing material for reversed-phase preparative separation Reviewed

    Yoshii Tomoka, Sakama Akihiro, Kanamori Kazuyoshi, Nakanishi Kazuki, Imai Hiroaki, Citterio Daniel, Hiruta Yuki

    JOURNAL OF CHROMATOGRAPHY A   Vol. 1688   page: 463722   2023.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Journal of Chromatography A  

    Purification of basic drugs in reversed-phase mode is often difficult, mainly due to adsorption of positively charged compounds to the silica gel-based stationary phase. Since this adsorption can be suppressed under alkaline condition, columns with alkali-resistance are required. In addition, compounds with acid-sensitive structures are sometimes degraded during separation on silica gel-based columns which exhibit acidity due to their surface structure. We prepared an alkali-resistant reversed-phase packing material, Eggshell-PMAcO based on eggshells modified with an amphiphilic copolymer, poly(maleic acid-alt-1-octadecene) (PMAcO). The height equivalent to a theoretical plate (HETP) of the Eggshell-PMAcO column was improved by surface treatment with ammonium acetate buffer (900 mM, pH = 3.7), which is an inexpensive reagent, and the retention behavior for hydrophobic compounds was compared to a typical ODS column based on silica gel, resulting in sufficient selectivity of the eggshell-based column for hydrophobic compounds, as indicated by the ratio of retention factors of pentylbenzene and butylbenzene (Eggshell-PMAcO column: 1.55, ODS column: 1.65). Column temperature-dependent retention behavior of naphthalene was investigated in the temperature range from 25 °C to 45 °C, followed by the calculation of thermodynamic parameters. There was little difference in the standard molar enthalpy (Eggshell-PMAcO: −19.6 kJ/mol, ODS: −21.7 kJ/mol). The absolute value of the standard free Gibbs energy for the Eggshell-PMAcO column was much smaller than that of the ODS column (Eggshell-PMAcO: −0.284 kJ/mol, ODS: −13.0 kJ/mol), indicating that the Eggshell-PMAcO column had a weaker retention strength for naphthalene than the ODS column mainly due to the large difference in the standard molar entropy (Eggshell-PMAcO: −64.9 J/mol K, ODS column: −29.2 J/mol K). The retention capacities for imipramine under neutral (water/methanol) and alkaline (0.1% triethylamine water/methanol) conditions were 0.2 mg and 5 mg, respectively, based on injection mass-dependent HETP, retention factor and symmetry factor. Finally, the prepared column was applied to the purification of a building block for nucleic acid drugs. This study demonstrated that reversed-phase columns, which can be fabricated from eggshells and an amphiphilic copolymer in an inexpensive and eco-friendly way, have the ability to purify basic compounds and acid-sensitive compounds.

    DOI: 10.1016/j.chroma.2022.463722

    Web of Science

    Scopus

    PubMed

  2. Macroporous Niobium Phosphate-Supported Magnesia Catalysts for Isomerization of Glucose-to-Fructose Reviewed

    Gao Da-Ming, Shen Yong-Bing, Zhao Bohan, Liu Qian, Nakanishi Kazuki, Chen Jie, Kanamori Kazuyoshi, Wu Huaping, He Zhiyong, Zeng Maomao, Liu Haichao

    ACS SUSTAINABLE CHEMISTRY & ENGINEERING   Vol. 7 ( 9 ) page: 8512 - 8521   2019.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ACS Sustainable Chemistry and Engineering  

    The catalytic performance of hierarchically porous niobium phosphate (NbP) supported magnesia for the glucose isomerization to fructose, was investigated under atmospheric air atmosphere. Porous NbP showed improved support effects on MgO in comparison to other metal oxides tested for glucose isomerization. Also, the amount and distribution of basic sites were largely changed by supporting magnesia on NbP. Although the textural properties were reduced and solid acids formed on the MgO/NbP catalysts, glucose isomerization was promoted by increasing magnesium content. The maximum yield of fructose reached ∼24.6% over 40%MgO/NbP-500 with selectivity of 65.7% for 1.0 wt % glucose at 120 °C. The fructose productivity peaked as high as 13.6 g g catalyst-1 h -1 over 40%MgO/NbP-700 catalyst. The leaching of cations and anions resulted in a homogeneous system for glucose isomerization. Regeneration almost fully reactivated the catalyst to its initial activity. The MgO/NbP showed high stability under air atmosphere for 15 days, and high potential use for glucose isomerization.

    DOI: 10.1021/acssuschemeng.9b00292

    Web of Science

    Scopus

  3. Hierarchically Porous Monoliths of Oxygen-deficient Anatase TiO2-x with Electronic Conductivity (vol 3, pg 7205, 2013) Reviewed

    Kitada Atsushi, Hasegawa George, Kobayashi Yoji, Miyazaki Kohei, Abe Takeshi, Kanamori Kazuyoshi, Nakanishi Kazuki, Kageyama Hiroshi

    RSC ADVANCES   Vol. 3 ( 48 ) page: 26475 - 26475   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Web of Science

  4. Elastic Aerogels and Xerogels Synthesized From Methyltrimethoxysilane (MTMS) Reviewed

    Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi

    POLYMER-BASED SMART MATERIALS - PROCESSES, PROPERTIES AND APPLICATION   Vol. 1134   page: 173 - +   2009

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Web of Science

  5. Examination of mesopore structure of hierarchically macro/mesoporous silica by thermoporometry Reviewed

    E. Fukui, K. Shinohara, K. Nakanishi, K. Kanamori, T. Hanada

    Materials Research Society Symposium Proceedings   Vol. 1056   page: 28 - 33   2008.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Thermoporometry was employed to monitor the mesopore evolution in wet, drying and heat-treatment stages of monolithic macro/mesoporous silica with SBA-15 like structure. Direct comparison of mesopores in wet state was only possible with the samples extracted with sulfuric acid. In good agreement with the preceding study, the sulfuric acid not only removed the surfactant but also modified the silica gel network into that with reduced amount of micropores and increased stability against the drying stress. Thermoporometry revealed that the structural evolution takes place completely in the wet condition, which accompanies a decrease in the thickness of non-freezable water. © 2008 Materials Research Society.

    Scopus

  6. Hierarchically porous oxides, hybrids and polymers via sol-gel accompanied by phase separation Reviewed

    Kazuki Nakanishi

    ORGANIC/INORGANIC HYBRID MATERIALS - 2007   Vol. 1007   page: 51 - 62   2008.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:MATERIALS RESEARCH SOCIETY  

    In various crosslinking systems containing metal oxides, organo-siloxane polymers and pure hydrocarbons, monolithic materials with hierarchical well-defined macropores and controlled mesopores have been synthesized. Synthetic progress in alkoxy-derived macroporous silica lead to the preparation of long-range ordered mesoporous skeletons in well-defined. macroporous framework. Alkylene-bridged silicon alkoxides can also be prepared into similarly hierarchical porous structures with broadened variations in framework morphology. Macro-mesoporous alkoxy-derived pure titania and zirconia have been prepared using hydrochloric acid - mediated processes. Compared with those prepared from colloidal dispersions, alkoxy-derived macroporous titania exhibited much higher mechanical strength. Titania monolith is a promising candidate as a separation medium to discriminate phosphorylated compounds in a liquid chromatography mode. Pure alumina macroporous monolith has been first synthesized from aluminum salt using propylene glycol as a proton scavenger to thrust the solution pH from acidic into neutral conditions. Alumina-based complex oxides such as garnets and spinels can also be prepared in pure phases. Polymerization and phase separation in organic crosslinker system was also controlled to obtain well-defined co-continuous macro-frameworks instead of those composed of aggregated particles. These examples demonstrate the versatility of using phase-separation in gelling systems to obtain well-defined macroporous structures.

    Web of Science

    Scopus

  7. Elastic aerogels and xerogels synthesized from methyltrimethoxysilane (MTMS) Reviewed

    Kanamori K., Nakanishi K., Hanada T.

    Materials Research Society Symposium Proceedings   Vol. 1134   page: 173 - 178   2008.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Materials Research Society Symposium Proceedings  

    Transparent organic-inorganic hybrid aerogels and aerogel-like xerogels have been prepared from methyltrimethoxysilane (MTMS) respectively by supercritical drying (SCD) and ambient pressure drying (APD). The new aerogels and xerogels significantly deform without collapsing on uniaxial compression and almost fully relax when unloaded. This elastic behavior, termed as "spring-back", allows APD without noticeable shrinkage and cracking. The flexible network composed of lower cross-linking density (up to three bonds per every silicon atom) compared to silica gels (up to four bonds) and repulsion between hydrophobic methyl groups bonded to every silicon atom largely contributes to the pronounced deformability and relaxing, respectively. Lower surface silanol group density also plays a crucial role for the "spring-back" behavior. © 2009 Materials Research Society.

    Scopus

  8. Hierarchically porous oxides, hybrids and polymers via sol-gel accompanied by phase separation Reviewed

    Nakanishi Kazuki

    ORGANIC/INORGANIC HYBRID MATERIALS - 2007   Vol. 1007   page: 51 - 62   2008

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Web of Science

  9. Living radical polymerization in size-exclusion silica gel column reactors Reviewed

    Katsube M., Ouchi M., Ando T., Sawamoto M., Nakanishi K., Ishizuka N.

    Polymer Preprints, Japan   Vol. 55 ( 1 )   2006.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Polymer Preprints, Japan  

    This work was aimed to development of continuous-flow living radical polymerization in a silica-gel column, "Chromolith", focusing its separation function by combination of surface chemical absorption and size-exclusion via uniquely shaped mesopores, Thus, living radical copolymerization of two monomers with different polarities, methyl methacrylate (MMA) and 2(dimethylamino)ethyl methacrylate (DMAEMA) was performed with a catalyst [2; Ru(Ind)Cl(PPh3)2] coupled with an initiator (1). Copolymers were continuously produced, and molecular weight distributions were narrower than that in the corresponding batch process.

    Scopus

  10. New macroporous crosslinked polymer gels prepared via living radical polymerization Reviewed

    Kanamori K., Nakanishi K., Hanada T.

    Materials Research Society Symposium Proceedings   Vol. 947   page: 66 - 71   2006

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Materials Research Society Symposium Proceedings  

    Macroporous crosslinked polymer gels have been prepared via TEMPO-mediated living radical polymerization of divinylbenzene (DVB) in a solvent with a counter polymer. Incorporating a counter polymer, poly(dimethylsiloxane) (PDMS), induced macroscopic spinodal-type phase separation during the course of polymerization of DVB while suppressing the segregation of DVB-derived particles from the solution by living polymerization. Well-defined macroporous morphologies comprising continuous DVB-derived skeletons have thus obtained. Macropore volume and diameter were independently controlled by altering the concentrations of PDMS and the solvent. Since the present polymer gels are prepared using only the multifunctional "crosslinker", mechanical durability against bending and compression was found to be as high as inorganic ceramics with similar morphologies and porosities. © 2007 Materials Research Society.

    DOI: 10.1557/proc-0947-a03-27

    Scopus

  11. Monolithic O/I-hybrids with hierarchically ordered meso- And macropores Reviewed

    Nakanishi K., Kobayashi Y., Amatani T., Hirao K., Kodaira T.

    Materials Research Society Symposium Proceedings   Vol. 847   page: 147 - 157   2005.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Materials Research Society Symposium Proceedings  

    Organic-Inorganic hybrid gels with hierarchical well-defined macropores and supramolecularly templated mesopores with long-range orders have been synthesized in the systems of bridged poly(silsesquioxane) systems. Nonionic surfactants such as poly(ethyleneglycol)-poly(propyleneglycol)- poly(ethyleneglycol) triblock copolymers, EOPOEOs, were found to be effective both in inducing the phase separation to give macroporous morphology and in templating the mesopores with narrow size distribution. The number of methylene units in the bridge, changed from 1 to 6 in the present experiments, affected both the phase separation tendency and template strength. In the system containing 1,2-bis(trimethoxysilyl)ethane, 2D-hexagonal arrangement of mesopores have been prepared in the gel skeleton comprising the well-defined continuous macroporous network with an aid of micelle-stabilizing agent. © 2005 Materials Research Society.

    Scopus

  12. Hierarchical macro-mesoporous silica monolith Reviewed

    Amatani T., Nakanishi K., Hirao K., Kodaira T.

    Materials Research Society Symposium Proceedings   Vol. 847   page: 121 - 126   2005.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Materials Research Society Symposium Proceedings  

    Monolithic pure silica gels with hierarchical macro-mesoporous structure have been synthesized via spontaneous sol-gel process from silicon alkoxidc using a structure-directing agent and a micelle-swelling agent. Monolithic body with well-defined co-continuous macropores is a result of concurrent phase separation and sol-gel transition induced by the polymerization reaction, whereas the mesopores are templated by the cooperative self-assembly of inorganic species, a structure-directing agent and a micelle-swelling agent. The following removal of surfactants by heat-treatment gives silica gels with hierarchical and fully accessible pores in discrete size ranges of micrometers and nanometers. The highly ordered 2D-hexagonal arrays of mesopores have been confirmed by X-ray diffraction measurements and FE-SEM observations. Furthermore, by further additions of the micelle-swelling agent, the mesostructural transition from well-ordered 2D-hexagonal arrays to mesostructured cellular foams (MCF) have been induced accompanied by minor modifications of the micrometer-range structure. © 2005 Materials Research Society.

    Scopus

  13. Living radical polymerization in ruthenium-bearing size-exclusion silica gel column reactors Reviewed

    Katsube M., Ando T., Ouchi M., Sawamoto M., Nakanishi K., Ishizuka N.

    Polymer Preprints, Japan   Vol. 54 ( 2 )   2005.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Polymer Preprints, Japan  

    A catalyst corresponding to Ru(Ind)Cl(PPh3)2 was covalently supported onto a mesopore and silica-gel (Chromolith™) to construct a "size-exclusion column reactor" in which "physical control" of polymer molecular weight is expected by the retention-time difference of each mobile substrate according to its size exclusion (Scheme 2). With Ru(II)-catalyzed living radical polymerization continuously performed in this column, better reaction control is expected by not only the supported catalyst but by this column separation (Fig. 1). The Ru-bearing column 5 (powder form) in fact induced living radical polymerization of methyl methacrylate with initiator 6 and an additive (n-Bu2NH) in toluene at 80°C (Fig. 2). Continuous flow polymerization in the column reactor will be discussed and compared with those in batch systems.

    Scopus

  14. Mechanical and thermal properties of porous polyimide monoliths crosslinked with aromatic and aliphatic triamines Reviewed

    Mitsuhiro Ishida, Yutaro Sashiyama, Hirofumi Akamatsu, Katsuro Hayashi, Kazuki Nakanishi, George Hasegawa

    Journal of Sol-Gel Science and Technology   Vol. 104 ( 3 ) page: 526 - 535   2022.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1007/s10971-022-05843-8

    Web of Science

    Scopus

    Other Link: https://link.springer.com/article/10.1007/s10971-022-05843-8/fulltext.html

  15. Dedicated to Professor Sumio Sakka, Founding Editor of Journal of Sol-Gel Science and Technology Reviewed

    Nakanishi Kazuki, Kozuka Hiromitsu

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 104 ( 3 ) page: 447 - 448   2022.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Journal of Sol-Gel Science and Technology  

    DOI: 10.1007/s10971-022-05955-1

    Web of Science

    Scopus

  16. Amphiphilic Copolymer-Modified Eggshell-Based Column Packing Materials for the Preparative Separation of Basic Drugs Reviewed

    Yoshii T., Mochida M., Kaizu K., Soda Y., Kanamori K., Nakanishi K., Sato T., Imai H., Citterio D., Hiruta Y.

    ACS Applied Polymer Materials   Vol. 4 ( 10 ) page: 6949 - 6957   2022.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ACS Applied Polymer Materials  

    A way to utilize eggshells is desired because most of the eggshell waste is disposed of in landfills. Despite eggshells having attractive features such as a thermodynamically stable porous crystalline structure, their effective utilization as a functional material has yet to be demonstrated. Herein, we developed an alkali-stable column packing material for reversed-phase preparative high-performance liquid chromatography (HPLC) based on eggshells. Nanocrystals and biopolymers present on eggshell powder were removed by surface treatment with buffered ethylenediaminetetraacetic acid (EDTA) and sodium hypochlorite solutions, resulting in bare calcium carbonate with a uniform porous surface. The obtained particles were modified with poly(maleic acid-alt-1-octadecene) (PMAcO) having hydrophobic alkyl chains and anionic carboxylate groups. The prepared PMAcO-modified eggshell-based material was applied to an HPLC column, and its performance is evaluated. The column succeeded in the separation of alkylbenzenes, steroids, and diastereomers. It was also used for the separation of basic tricyclic antidepressants in an alkaline mobile phase, showing excellent retention capacity and alkali stability. This study demonstrates the potential of eggshell utilization, providing not only a practical stationary phase for HPLC but also a solution for recycling calcium carbonate-based biomineral waste.

    DOI: 10.1021/acsapm.2c00866

    Scopus

  17. Oxide-on-Oxide Porous Electrodes Revealing Superior Reversible Li<sup>+</sup>-Coupled Electron-Transfer Properties by Unconventional Heterojunction Effects Reviewed

    Yosuke Hara, Rikuo Shigetake, Kazuki Nakanishi, Kazuyoshi Kanamori, Ken Sakaushi

    ACS Applied Materials &amp; Interfaces   Vol. 14 ( 31 ) page: 35883 - 35893   2022.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society (ACS)  

    DOI: 10.1021/acsami.2c06297

    Web of Science

    Scopus

    PubMed

  18. Porous polymer-derived ceramics: Flexible morphological and compositional controls through sol–gel chemistry Reviewed

    Hasegawa G., Kanamori K., Nakanishi K.

    Journal of the American Ceramic Society   Vol. 105 ( 1 ) page: 5 - 34   2022.1

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of the American Ceramic Society  

    Porous nonoxide ceramics have exhibited impressive progress in terms of synthesis and applications over the past few decades because of their unique characteristics distinguished from the oxide counterparts. From the synthetic aspect, the preceramic polymer route, where nonoxide ceramics such as carbides and nitrides are produced from molecular precursors, offers exceptional opportunities to elaborate and control the material shape as well as the micro- and nanostructures in concert with various techniques. This review presents monolithic ceramic materials based on various reduced phases bearing hierarchical porosity with a focus on those obtained from macroporous preceramic monoliths prepared via the one-pot sol–gel process accompanied by spinodal decomposition. Here, we highlight two classes of preceramic inorganic–organic hybrid gels: organometallic crosslinked polymers based on poly(silsesquioxane)s and nonorganometallic hybrid networks related to Ti without Ti–C bonds. The polymer-to-ceramic conversion processes are discussed with concern for the crystal transition behaviors and the variation of pore properties in different length scales upon heating. In addition, although out of the preceramic polymer category, some examples of inorganic–organic nanocomposite gels with a carbonizable polymer and/or urea for yielding porous metal carbides and nitrides in a monolithic form are introduced as well, which provides extended versatility toward a variety of transition metal systems.

    DOI: 10.1111/jace.18130

    Scopus

  19. Designing hierarchical porosity in tin oxide monoliths and their application as a solid acid catalyst Reviewed

    Yoshinao Suzuki, George Hasegawa, Kazuyoshi Kanamori, Kazuki Nakanishi

    New Journal of Chemistry   Vol. 45 ( 37 ) page: 17558 - 17565   2021.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry ({RSC})  

    DOI: 10.1039/d1nj03307g

    Web of Science

    Scopus

  20. Sol-gel based structural designs of macropores and material shapes of metal-organic framework gels Reviewed

    Hara Y., Manabe K., Nakanishi K., Kanamori K.

    Materials Advances   Vol. 2 ( 13 ) page: 4235 - 4239   2021.7

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Materials Advances  

    We have developed a general synthetic strategy to control macroporous structures and material shapes of metal-organic framework (MOF) gels via a sol-gel based structural control process. A series of 1,3,5-benzene tricarboxylic acid (BTC) based MOF gels, Cr-BTC and Zr-BTC, have been chosen as a proof of concept.

    DOI: 10.1039/d0ma01009j

    Web of Science

    Scopus

  21. Utility of glomerular Gd-IgA1 staining for indistinguishable cases of IgA nephropathy or Alport syndrome Reviewed

    Ishiko S., Tanaka A., Takeda A., Hara M., Hamano N., Koizumi M., Ueno T., Hayashi H., Kondo A., Nagai S., Aoto Y., Sakakibara N., Nagano C., Horinouchi T., Yamamura T., Ninchoji T., Shima Y., Nakanishi K., Yoshikawa N., Iijima K., Nozu K.

    Clinical and Experimental Nephrology   Vol. 25 ( 7 ) page: 779 - 787   2021.7

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Clinical and Experimental Nephrology  

    Background: Pathological findings in Alport syndrome frequently show mesangial proliferation and sometimes incidental IgA deposition, in addition to unique glomerular basement membrane (GBM) changes including thin basement membrane and/or lamellation. However, similar GBM abnormalities are also often observed in IgA nephropathy. Both diseases are also known to show hematuria, proteinuria, and sometimes macrohematuria when associated with viral infection. Therefore, it can be difficult to make a differential diagnosis, even based on clinical and pathological findings. Some recent articles demonstrated that galactose-deficient IgA1 (Gd-IgA1)-specific monoclonal antibody (KM55) could potentially enable incidental IgA deposition to be distinguished from IgA nephropathy. Methods: We performed comprehensive gene screening and glomerular Gd-IgA1 and type IV collagen α5 chain immunostaining for five cases with both IgA deposition and GBM changes to confirm that Gd-IgA1 can help to distinguish these two diseases. Results: Four of the cases were genetically diagnosed with Alport syndrome (Cases 1–4) and one was IgA nephropathy with massive GBM changes, which had a negative gene test result (Case 5). In Cases 1–4, glomerular Gd-IgA1 deposition was not detected, although there was positivity for IgA in the mesangial area. In Case 5, glomerular Gd-IgA1 deposition was observed. Conclusion: Gd-IgA1 expression analysis could clearly differentiate these two disorders. This approach can be applied to identify these two diseases showing identical clinical and pathological findings.

    DOI: 10.1007/s10157-021-02054-3

    Scopus

  22. Global wellposedness for the energy-critical Zakharov system below the ground state Reviewed

    Candy T., Herr S., Nakanishi K.

    Advances in Mathematics   Vol. 384   2021.6

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Advances in Mathematics  

    The Cauchy problem for the Zakharov system in the energy-critical dimension d=4 is considered. We prove that global well-posedness holds in the full (non-radial) energy space for any initial data with energy and wave mass below the ground state threshold. The result is based on a Strichartz estimate for the Schrödinger equation with a potential. More precisely, a Strichartz estimate is proved to hold uniformly for any potential solving the free wave equation with mass below the ground state constraint. The key new ingredient is a bilinear (adjoint) Fourier restriction estimate for solutions of the inhomogeneous Schrödinger equation with forcing in dual endpoint Strichartz spaces.

    DOI: 10.1016/j.aim.2021.107746

    Scopus

  23. The Correlation between Fluid Distribution and Swelling or Subjective Symptoms of the Trunk in Lymphedema Patients: A Preliminary Observational Study Reviewed

    Hisano F., Niwa S., Nakanishi K., Mawaki A., Murota K., Fukuyama A., Takeno Y., Watanabe S., Fujimoto E., Oshima C.

    Lymphatic Research and Biology   Vol. 19 ( 3 ) page: 269 - 273   2021.6

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Lymphatic Research and Biology  

    Background: Manual lymph drainage (MLD) is one of the common treatments for breast cancer-related lymphedema (BCRL). Although the primary goal of MLD is to drain the excessive fluid accumulated in the affected upper limb and trunk to an area of the body that drains usually, the use of MLD is decided based on swelling and subjective symptoms, without assessing whether there is fluid accumulated in the affected region. The purpose of this study was to examine truncal fluid distribution in a sample of BCRL patients and investigate any correlation between such fluid distribution and swelling or subjective symptoms. Methods and Results: An observational study was conducted with 13 women who had unilateral, upper extremity BCRL. Fluid distribution was evaluated by using two magnetic resonance imaging (MRI) sequences: half-Fourier acquisition single-shot turbo spin echo and three-dimensional double-echo steady-state. The presence of swelling was determined by lymphedema therapists, and subjective symptoms were measured by using a visual analog scale. On MRI, no participants had any free water signals in the trunk. However, seven had swelling and all 13 had some kind of subjective symptoms on the affected side of their trunk. Conclusions: These results suggest that swelling and subjective symptoms do not correlate with the presence of truncal fluid. For such cases, a different approach than MLD may be needed to address truncal swelling and related subjective symptoms. Checking for the presence of fluid in the truncal region may help MLD be used more appropriately.

    DOI: 10.1089/lrb.2020.0075

    Scopus

  24. Preparation of hierarchically porous spinel CoMn<inf>2</inf>O<inf>4</inf> monoliths via sol–gel process accompanied by phase separation Reviewed

    Lu X., Kanamori K., Hasegawa G., Nakanishi K.

    Journal of the American Ceramic Society   Vol. 104 ( 6 ) page: 2449 - 2459   2021.6

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of the American Ceramic Society  

    Cobalt manganite-based hierarchically porous monoliths (HPMs) with three-dimensionally (3D) interconnected macropores and open nanopores have been prepared via the sol–gel process accompanied by phase separation. The controlled hydrolysis and polycondensation of the brominated metal alkoxides, which are generated from an incomplete reaction between epichlorohydrin and MBr2 (M = Co and Mn) in N,N-dimethylformamide (DMF), form a monolithic gel based on the two divalent metal cations. The dual-polymer strategy using polyvinylpyrrolidone (PVP) and poly(ethylene oxide) (PEO) effectively induces the spinodal decomposition, where PVP and PEO are preferentially distributed to the gel phase and fluid phase, respectively, resulting in a porous gel characterized by the co-continuous structure. The effects of DMF and PVP on the porous morphology derived from the phase separation have been systematically studied. Calcination of the as-dried gels allows for the crystallization into the spinel phase yielding hierarchically porous CoMn2O4 monoliths, which have been examined in detail by the structural and compositional analyses.

    DOI: 10.1111/jace.17662

    Scopus

  25. Highly porous melamine-formaldehyde monoliths with controlled hierarchical porosity toward application as a metal scavenger Reviewed

    Yuki Nakanishi, Yosuke Hara, Riichi Miyamoto, Kazuki Nakanishi, Kazuyoshi Kanamori

    Materials Advances   Vol. 2 ( 8 ) page: 2604 - 2608   2021.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry (RSC)  

    <p>Hierarchically porous melamine-formaldehyde monoliths were prepared <italic>via</italic> sol–gel accompanied by phase separation, followed by a hydrothermal process. The obtained monoliths showed efficient adsorption of precious metal ions.</p>

    DOI: 10.1039/d1ma00034a

    Web of Science

    Scopus

  26. Tunable and Well-Defined Bimodal Porous Model Electrodes for Revealing Multiscale Structural Effects in the Nonaqueous Li-O<inf>2</inf>Electrode Process Reviewed

    Hara Y., Ono M., Matsuda S., Nakanishi K., Kanamori K., Sakaushi K.

    Journal of Physical Chemistry C   Vol. 125 ( 2 ) page: 1403 - 1413   2021.1

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Physical Chemistry C  

    Porous architecture is key in the nonaqueous lithium-oxygen (Li-O2) electrode process, which is attracting huge interest because of its application in reversible energy storage with high theoretical energy density. However, it is still challenging to understand the optimal porous structure to obtain high reversibility of the reaction. One main reason is because of instability and undefined porous structures of standard electrodes consisting of carbonaceous materials, and this issue hinders from unveiling the fundamental mechanism in the complicated electrode process. Here, we developed a new synthetic strategy to design monolithic electrodes of pure metallic nickel with controlled bimodal porous structures. The present work aims to investigate the fundamental effects of the bimodal macroporous structure in the Li-O2 electrode process under carbon-/binder-free stable model electrodes. As the result, we found that, depending on the multiscale structural configurations, the bimodal macroporous structure gave significant influences to key properties, such as the efficiency of redox-mediators, discharge overpotential, and cycling life. This work indicates that the rational design of stable and conductive porous materials is one of the promising approaches to investigate highly complicated electrochemical reactions in porous electrodes and suggest new guidelines for further development of hierarchically structured electrodes toward advanced electrochemical systems.

    DOI: 10.1021/acs.jpcc.0c10446

    Scopus

  27. Hierarchically porous monoliths based on low-valence transition metal (Cu, Co, Mn) oxides: Gelation and phase separation Reviewed

    Lu, X., Kanamori, K., Nakanishi, K.

    National Science Review   Vol. 7 ( 11 ) page: 1656 - 1666   2020.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/nsr/nwaa103

    Web of Science

    Scopus

    PubMed

  28. Hierarchically porous monoliths prepared via sol–gel process accompanied by spinodal decomposition Reviewed

    Xuanming Lu, George Hasegawa, Kazuyoshi Kanamori, Kazuki Nakanishi

    Journal of Sol-Gel Science and Technology   Vol. 95 ( 3 ) page: 530 - 550   2020.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media {LLC}  

    DOI: 10.1007/s10971-020-05370-4

    Web of Science

    Scopus

  29. Variation of meso- and macroporous morphologies in resorcinol-formaldehyde (RF) gels tailored via a sol-gel process combined with soft-templating and phase separation Reviewed

    Hasegawa George, Yano Takaya, Akamatsu Hirofumi, Hayashi Katsuro, Nakanishi Kazuki

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 95 ( 3 ) page: 801 - 812   2020.9

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Sol-Gel Science and Technology  

    A wide-range control over multimodal pore systems in porous monoliths is a key technology for developing functional materials, as the favorable pore structures in different length scales are required to be tailored depending on their application fields. In the alkoxy-derived sol–gel systems of silica and organosilicates, the synthetic methodology of meso- and macroporous monoliths with tunable pore properties has been developed by combining the supramolecular self-assembly of a Pluronic surfactant and polymerization-induced phase-separation techniques. This strategy has been applied to the sol–gel process of phenolic resins, giving rise to the hierarchically porous polymer gels with ordered mesoporosity and the corresponding carbon monoliths after carbonization. However, the controllable size range has been limited so far. This study has explored the relationship between the starting composition and the bimodal pore properties in further detail aiming at a better control of pore properties in phenolic resins. The enlargement of mesopore size has been achieved, yet associated with broadening the mesopore size distribution and coarsening the macropore morphology, resulting in the particle aggregates. The systematical investigation also reveals that the addition of KCl can improve the micelle arrangement in macroframework and provide the narrower mesopore size distribution. [Figure not available: see fulltext.]

    DOI: 10.1007/s10971-020-05236-9

    Web of Science

    Scopus

  30. On-site formation of small Ag nanoparticles on superhydrophobic mesoporous silica for antibacterial application Reviewed

    Zhu Yang, Chunhua Wu, Kazuyoshi Kanamori, Toshiyuki Kamei, Toyoshi Shimada, Kazuki Nakanishi

    New Journal of Chemistry   Vol. 44 ( 32 ) page: 13553 - 13556   2020.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry ({RSC})  

    DOI: 10.1039/d0nj02502j

    Web of Science

    Scopus

  31. Superhydrophobic highly flexible doubly cross-linked aerogel/carbon nanotube composites as strain/pressure sensors Reviewed

    Zu G., Wang X., Kanamori K., Nakanishi K.

    Journal of Materials Chemistry B   Vol. 8 ( 22 ) page: 4883 - 4889   2020.6

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Materials Chemistry B  

    We report novel superhydrophobic highly flexible composites based on a doubly cross-linked (DCL) aerogel and carbon nanotubes (CNTs) for strain/pressure sensing. The DCL aerogel/CNT composite is prepared by radical polymerization of vinylmethyldimethoxysilane and vinyldimethylmethoxysilane, respectively, followed by hydrolytic co-polycondensation of the obtained polyvinylmethyldimethoxysilane and polyvinyldimethylmethoxysilane, combined with the incorporation of CNTs. Benefiting from the flexible methyl-rich DCL structure of the aerogel and conductive CNTs, the resultant DCL aerogel/CNT composite combines superhydrophobicity, high compressibility, high bendability, high elasticity, and strain- and pressure-sensitive conductivity. We demonstrate that the composite can be applied as a high-performance strain/pressure sensor for the detection of arterial pulse waves and joint bending with high sensitivity and high durability against humidity.

    DOI: 10.1039/c9tb02953b

    Scopus

    PubMed

  32. Superelastic Triple-Network Polyorganosiloxane-Based Aerogels as Transparent Thermal Superinsulators and Efficient Separators Reviewed

    Zu G., Kanamori K., Wang X., Nakanishi K., Shen J.

    Chemistry of Materials   Vol. 32 ( 4 ) page: 1595 - 1604   2020.2

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Chemistry of Materials  

    We report new polyorganosiloxane aerogels with superhydrophobicity, high elasticity, and high bendability based on polyvinyl-poly(dimethylsiloxane) (PVPDMS)/polymethylsilsesquioxane (PMSQ). They are synthesized by a radical polymerization/co-polycondensation strategy that involves radical polymerization of vinyldimethylmethoxysilane to obtain chainlike polyvinyldimethylmethoxysilane (PVDMMS) polymers followed by hydrolytic co-polycondensation of PVDMMS polymers and methyltrimethoxysilane combined with ambient pressure drying without any post-gelation modifications. The resultant PVPDMS/PMSQ aerogels exhibit a highly tunable triple-network structure consisting of flexible inter-cross-linked hydrocarbon polymers, poly(dimethylsiloxane), and PMSQ. The aerogels with a low content of PVPDMS exhibit small pore sizes (2-80 nm), good transparency, high surface areas, and thermal superinsulation (λ = 0.0148 W m-1 K-1), while those with a high content of PVPDMS exhibit large pore sizes (100 nm-3 μm) and excellent selective absorption for organic liquids. In addition, incorporation of graphene oxide (GO) in PVPDMS/PMSQ aerogels can afford highly flexible PVPDMS/PMSQ/GO composite aerogels, which show efficient separation of three-component water/oil/dye mixtures. These aerogels are promising in the practical applications of thermal insulation, absorption/adsorption, and separation.

    DOI: 10.1021/acs.chemmater.9b04877

    Scopus

  33. Colorless Transparent Melamine-Formaldehyde Aerogels for Thermal Insulation Reviewed

    Nakanishi, Y., Hara, Y., Sakuma, W., Saito, T., Nakanishi, K., Kanamori, K.

    ACS Applied Nano Materials   Vol. 3 ( 1 ) page: 49 - 54   2020.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/acsanm.9b02275

    Web of Science

    Scopus

  34. Self-Assembly of Metal–Organic Frameworks into Monolithic Materials with Highly Controlled Trimodal Pore Structures Reviewed

    Hara Y., Kanamori K., Nakanishi K.

    Angewandte Chemie - International Edition   Vol. 58 ( 52 ) page: 19047 - 19053   2019.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Angewandte Chemie - International Edition  

    We present a two-step template-free approach toward monolithic materials with controlled trimodal porous structures with macro-, meso-, and micropores. Our method relies on two ordering processes in discrete length scales: 1) Spontaneous formation of macroporous structures in monolithic materials by the sol–gel process through the short-range ordered self-assembly of metal–organic frameworks (MOFs), and 2) reorganization of the framework structures in a mediator solution. The Zr-terephthalate-based MOF (UiO-66-NH2) was adopted as a proof of concept. The self-assembly-induced phase separation process offered interconnected macropores with diameters ranging from 0.9 to 1.8 μm. The subsequent reorganization process converted the microporous structure from low crystalline framework to crystalline UiO-66. The resultant mesopore size within the skeletons was controlled in the range from 9 to 21 nm. This approach provides a novel way of designing spaces from nano- to micrometer scale in network-forming materials.

    DOI: 10.1002/anie.201911499

    Scopus

    PubMed

  35. Self‐Assembly of Metal–Organic Frameworks into Monolithic Materials with Highly Controlled Trimodal Pore Structures Reviewed

    Yosuke Hara, Kazuyoshi Kanamori, Kazuki Nakanishi

    Angewandte Chemie   Vol. 131 ( 52 ) page: 19223 - 19229   2019.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    DOI: 10.1002/ange.201911499

  36. Resilient, fire-retardant and mechanically strong polyimide-polyvinylpolymethylsiloxane composite aerogel prepared via stepwise chemical liquid deposition Reviewed

    Zhang Z., Wang X., Zu G., Kanamori K., Nakanishi K., Shen J.

    Materials and Design   Vol. 183   2019.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Materials and Design  

    Resilient, fire-retardant and mechanically strong polyimide-polyvinylpolymethylsiloxane (PI-PVPMS) composite aerogels have been prepared via stepwise chemical liquid deposition (SCLD). The synthesis is based on the formation of PI-PVPMS crosslinked network structure with (3-aminopropyl)trimethoxysilane (APTMS) as a coupling agent to provide reactive sites on the backbone. We successfully realize the PI in-situ growth on the whole super-flexible PVPMS gel skeleton with this simple method. The effect of APTMS amount and deposition time on the properties of final samples is deeply investigated. The resultant PI-PVPMS composite aerogels show excellent mechanical and thermal properties. They can support at least 10,000 times of their own weight and can recover 20% from a 60% of compressive strain, with an elastic modulus of 32 MPa. For thermal performance, they can maintain their structural integrity after being subjected to the alcohol lamp outer flame of around 650 °C for 30 min. These results together with the simple synthesis process demonstrate the potential for construction materials using PI-PVPMS composite aerogels. Furthermore, the SCLD synthesis method could also be applied to prepare other composite aerogels, especially for those containing complex polymer.

    DOI: 10.1016/j.matdes.2019.108096

    Scopus

  37. Superelastic Multifunctional Aminosilane-Crosslinked Graphene Aerogels for High Thermal Insulation, Three-Component Separation, and Strain/Pressure-Sensing Arrays Reviewed

    Zu G., Kanamori K., Nakanishi K., Lu X., Yu K., Huang J., Sugimura H.

    ACS Applied Materials and Interfaces   Vol. 11 ( 46 ) page: 43533 - 43542   2019.11

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:ACS Applied Materials and Interfaces  

    Aerogels have attracted great interest for their unique properties, but their mechanical brittleness and poor functionality highly limit their practical applications. Herein, we report unprecedented superelastic multifunctional aminosilane-crosslinked reduced graphene oxide (AC-rGO) aerogels that are prepared via a facile and scalable strategy involving simultaneous crosslinking and reducing of graphene oxide nanosheets with different kinds of aminosilanes via C-N coupling and hydrolytic polycondensation reactions. It is found that 3-aminopropyl(diethoxy)methylsilane (APDEMS) is the better choice to enhance hydrophobicity, elasticity, and other properties of the resulting aerogels compared with (3-aminopropyl)triethoxysilane. One APDEMS molecule plays three roles as a crosslinker, a reductant, and a hydrophobizing agent. An outstanding combination of high surface area, ultralow density, superhydrophobicity, supercompressibility, superelasticity, low thermal conductivity, ultrahigh absorption capacity for organic liquids, efficient three-component separation, and strain/pressure sensing has been achieved in a single APDEMS-crosslinked rGO aerogel for the first time. In addition, a flexible, highly sensitive, and moisture-resistant AC-rGO aerogel-based strain/pressure-sensing array for the effective detection of strain (0-80%)/pressure (10 Pa to 10 kPa) distributions and object shapes has been demonstrated.

    DOI: 10.1021/acsami.9b16746

    Scopus

    PubMed

  38. Thermogravimetric Evolved Gas Analysis and Microscopic Elemental Mapping of the Solid Electrolyte Interphase on Silicon Incorporated in Free-Standing Porous Carbon Electrodes Reviewed

    Hasegawa G., Kanamori K., Nakanishi K., Hayashi K.

    Langmuir   Vol. 35 ( 39 ) page: 12680 - 12688   2019.10

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Langmuir  

    Free-standing electrodes, which are free from additives (binders and conductive agents) and even current collectors, are useful in terms of both application research and fundamental study. Here, we demonstrate the preparation of binder-free monolithic carbon electrodes embracing Si nanoparticles in their well-defined porous scaffolds via the one-pot sol-gel reaction followed by carbonization. The free-standing electrodes with a thickness of 150 μm work out as a high-areal-density anode for Li-ion batteries, delivering up to ca. 7 mA h cm-2. As the Si content increases, the capacity decay on cycling becomes pronounced, which is likely to associate with the fracturing and pulverization of Si nanoparticles even with the size smaller than 100 nm after long-term cycles. The thermogravimetry-mass spectrometry profile of the cycled electrode corroborates the successive electrolyte decomposition to grow solid electrolyte interphase (SEI) mainly composed of lithium alkylcarbonates, polymeric species, and LiF, rendering the electrode mass nearly double of its original state after 200 cycles. The elemental mapping analysis reveals that LiF is generated inhomogeneously in the monolithic electrodes unlike the other SEI components, resulting in the concentration gradient depending on the distance from a Li counter electrode.

    DOI: 10.1021/acs.langmuir.9b02085

    Scopus

    PubMed

  39. Thermogravimetric evolved gas analysis and microscopic elemental mapping of the solid electrolyte interphase on silicon incorporated in free-standing porous carbon electrodes Reviewed

    George Hasegawa, Kazuyoshi Kanamori, Kazuki Nakanishi, Katsuro Hayashi

    Langmuir     2019.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  40. Ambient-dried highly flexible copolymer aerogels and their nanocomposites with polypyrrole for thermal insulation, separation, and pressure sensing Reviewed

    Guoqing Zu, Kazuyoshi Kanamori, Ayaka Maeno, Hironori Kaji, Kazuki Nakanishi, Jun Shen

    Polymer Chemistry   Vol. 10 ( 36 ) page: 4980 - 4990   2019.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry ({RSC})  

    Aerogels exhibit unique properties, but their practical applications have been restricted by low mechanical strength and costly supercritical drying; it remains difficult to obtain highly flexible aerogels with good thermal insulation and absorption by ambient pressure drying (APD). Here, we report novel highly flexible aerogels based on the polyvinylpolymethylsiloxane (PVPMS)/polyvinyltrimethylsilane (PVTMS) co-network, which consists of inter-cross-linked hydrocarbon and siloxane polymers with dangling trimethylsilyl groups, and its nanocomposite with polypyrrole (PPy). The PVPMS/PVTMS copolymer aerogels are facilely synthesized by a consecutive radical co-polymerization and hydrolytic polycondensation strategy from two monomers vinylmethyldimethoxysilane and trimethylvinylsilane without additional cross-linkers, followed by APD without any post-gelation modification. The PPy nanocomposite aerogels are synthesized by an in situ oxidation polymerization of pyrrole in the copolymer aerogel networks, followed by APD. The resulting aerogels consist of meso- to macro-scaled pore structures with tunable skeleton and pore sizes with variable cross-linking density and bulk density. In addition, these aerogels show good hydrophobicity and high flexibility in both compression and bending. Moreover, different functionalities such as excellent thermal insulation, oil-water separation, and pressure sensing can be imparted, allowing them to exhibit potential applications in thermal insulation, separation, and sensing.

    DOI: 10.1039/c9py00751b

    Web of Science

    Scopus

  41. Superhydrophobic Ultraflexible Triple-Network Graphene/Polyorganosiloxane Aerogels for a High-Performance Multifunctional Temperature/Strain/Pressure Sensing Array Reviewed

    Zu G., Kanamori K., Nakanishi K., Huang J.

    Chemistry of Materials   Vol. 31 ( 16 ) page: 6276 - 6285   2019.8

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Chemistry of Materials  

    Recently, many efforts have been made to develop various smart sensors. However, achieving flexible multifunctional sensors combining excellent sensing of temperature, strain, and pressure with a single material is still challenging. Here, we report unprecedented superhydrophobic ultraflexible reduced graphene oxide (rGO)/polyorganosiloxane aerogels and high-performance multifunctional temperature/strain/pressure sensors based on these aerogels. GO nanosheets are first cross-linked and reduced with (3-aminopropyl)triethoxysilane (APTES) to obtain APTES-modified rGO aerogels, which are then further covalently cross-linked with polyvinylmethyldimethoxysilane polymers and vinylmethyldimethoxysilane via copolycondensation to afford rGO/polyorganosiloxane aerogels. The resulting aerogels exhibit a coralline-like triple-network nanostructure consisting of rGO nanosheets, polyvinyl-poly(methylsiloxane), and poly(vinylmethylsiloxane) that are cross-linked with each other. The aerogels combine superhydrophobicity, high compressibility, high bendability, superelasticity, excellent machinability, and temperature-, strain-, and pressure-sensitive conductivity, which is a combination not observed with traditional materials. In addition, an rGO/polyorganosiloxane aerogel-based flexible multifunctional sensing array combining sensing of temperature (20-100 °C), strain (in the wide range of 0.1-80%), and pressure (in the wide range of 10 Pa to 110 kPa) with high sensitivity and high durability against compression, bending, and humidity has been demonstrated for the first time.

    DOI: 10.1021/acs.chemmater.9b02437

    Scopus

  42. Preparation of zinc oxide with a three-dimensionally interconnected macroporous structure via a sol-gel method accompanied by phase separation Reviewed

    Lu Xuanming, Kanamori Kazuyoshi, Nakanishi Kazuki

    NEW JOURNAL OF CHEMISTRY   Vol. 43 ( 29 ) page: 11720 - 11726   2019.8

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:New Journal of Chemistry  

    A facile method for the preparation of zinc oxide with three-dimensionally (3D) interconnected macropores has been developed. The Zn-based monolithic gel was obtained using citric acid (CA) as a structure supporter via an epoxide-mediated sol-gel method accompanied by phase separation. The size of the macropores could be controlled by the ratio of methanol to propylene oxide in the starting solution. The Zn-based gel was heat-treated in air with the purpose of removing the organic components and crystallizing the ZnO, finally resulting in pure ZnO (purity >90%, with negligible carbon content) with 3D interconnected macropores and an open nanoscale network. The influence of the starting solvent composition on the Zn-based gel morphologies has been examined and discussed based on the chemical compatibility of the Zn-CA complex with other components.

    DOI: 10.1039/c9nj02373a

    Web of Science

    Scopus

  43. Preparation of surface-coated macroporous silica (core-shell silica monolith) for HPLC separations: Graphical Abstract Reviewed

    Ito Risako, Morisato Kei, Kanamori Kazuyoshi, Nakanishi Kazuki

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 90 ( 1 ) page: 105 - 112   2019.4

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Sol-Gel Science and Technology  

    Abstract: Utilizing the spontaneous wetting of oligomeric silica-phase via phase-separation onto a solid surface in a confined dimension, sub-micrometer thick mesoporous layers have been coated on the surface of nonporous skeletons of preformed macroporous silica gels. The size and volume of mesopores within the layers could be controlled by subsequent aging conditions similarly to those reported for fully porous monolithic silica. Comparison of HPLC efficiencies of these novel type monolithic gels, core-shell silica monoliths, with those of a conventional silica monolith revealed that the retention factor per unit surface area became larger for core-shell silica monoliths. The increase in dynamic accessibility of analyte molecules to the mesopores well explain the improved retention factors in core-shell silica monoliths. [Figure not available: see fulltext.]

    DOI: 10.1007/s10971-018-4889-2

    Web of Science

    Scopus

  44. Hybrid silicone aerogels toward unusual flexibility, functionality, and extended applications Reviewed

    Kanamori Kazuyoshi, Ueoka Ryota, Kakegawa Takayuki, Shimizu Taiyo, Nakanishi Kazuki

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 89 ( 1 ) page: 166 - 175   2019.1

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Sol-Gel Science and Technology  

    Abstract: Here, we overview the developments in the past decade made on organic–inorganic hybrid aerogels and xerogels based on silicone (polyorganosiloxanes) through persistent works by the authors to increase the mechanical strength and flexibility and add functionality. Polymethylsilsesquioxane (PMSQ, CH3SiO3/2) has been found to show unusual strength and flexibility against compression, and their bending properties can also be improved by several strategies. Silicone-based networks with organic bridges between inorganic moieties are also beneficial for these improvements. In particular, organic bridges with a higher fraction and more extended length have been found to allow higher durability against large deformations. In addition, functional groups such as vinyl, chloromethyl, and amino can readily be introduced by starting from organoalkoxysilanes with these functional substituents (e.g., FG−Si(OR)3 or (RO)3Si−FG−Si(OR)3, where FG shows an organic substituent containing functional groups and R is typically methyl or ethyl), and other functional groups such as carboxyl can be introduced by post-gelation modifications on the pre-installed FG in the network. Possibilities in applications such as thermal insulators, photoluminescent media, and photocatalysts are also discussed. [Figure not available: see fulltext.].

    DOI: 10.1007/s10971-018-4804-x

    Web of Science

    Scopus

  45. Synthesis of hierarchically porous MgO monoliths with continuous structure via sol-gel process accompanied by phase separation Reviewed

    Lu Xuanming, Kanamori Kazuyoshi, Nakanishi Kazuki

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 89 ( 1 ) page: 29 - 36   2019.1

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Sol-Gel Science and Technology  

    Hierarchically porous magnesium oxide, MgO, monoliths with a well-defined continuous macroporous structure have been synthesized via the sol–gel route accompanied by phase separation. Magnesium chloride hexahydrate was used as a precursor, and propylene oxide was used as an acid scavenger to raise the pH of a reaction solution homogenously. In order to obtain a crack-free monolith after heating in air, poly(vinylpyrrolidone), PVP, was employed as a scaffold of the skeleton as well as a phase separation controller to form the continuous macropores with higher homogeneity. Due to the moderate hydrogen-bonding interaction with magnesium hydroxide, PVP reinforces the gel network essentially composed of fine grained magnesium hydroxide. Even after the removal of all organic components by calcination, the porous gel samples maintained their monolithic form. On the other hand, an additional incorporation of 1,3,5-benzenetricarboxylic acid, H3BTC, was found to be effective in suppressing the oriented growth of the micrometer-sized crystalline phase. The polycrystalline MgO monoliths with specific surface area of 185, 64, and 48 m2 g−1 were prepared after heating at 400, 500, and 600 °C in air, respectively. [Figure not available: see fulltext.].

    DOI: 10.1007/s10971-018-4682-2

    Web of Science

    Scopus

  46. Uric acid enhances alteplase-mediated thrombolysis as an antioxidant. Reviewed

    Kikuchi K, Setoyama K, Tanaka E, Otsuka S, Terashi T, Nakanishi K, Takada S, Sakakima H, Ampawong S, Kawahara KI, Nagasato T, Hosokawa K, Harada Y, Yamamoto M, Kamikokuryo C, Kiyama R, Morioka M, Ito T, Maruyama I, Tancharoen S

    Scientific reports   Vol. 8 ( 1 ) page: 15844   2018.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1038/s41598-018-34220-1

    PubMed

  47. Sol-gel preparation of hierarchically porous magnesium aluminate (MgAl2O4) spinel monoliths for dye adsorption Reviewed

    Guo Xingzhong, Yin Pengan, Kanamori Kazuyoshi, Nakanishi Kazuki, Yang Hui

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 88 ( 1 ) page: 114 - 128   2018.10

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Sol-Gel Science and Technology  

    Abstract: Hierarchically porous spinel-type binary metal oxide MgAl2O4 with cocontinuous skeletons and interconnected macropores has been synthesized by a facile sol–gel method accompanied by phase separation, in which poly (ethylene oxide) (PEO) works as phase separation inducer to form micrometer-scale phase-separated macrochannels at the same time of sol–gel transition. The obtained xerogels exhibit in the form of a monolith with well-defined macropores and cocontinuous dense skeletons by adjusting the amount of PEO. The xerogel and those heat-treated at or below 600 °C are amorphous, and heat-treatment at or above 700 °C allows the precipitation of complete crystalline MgAl2O4 spinel with a macropore size of 0.7–0.9 μm, a porosity of 60–70%, and a BET surface area of 40–80 m2 g−1, without spoiling the macrostructure of monoliths. Three anionic dyes and two cationic dyes are selected as targeted adsorbates to investigate the selective adsorption ability of a hierarchically porous MgAl2O4 spinel. The resultant MgAl2O4 spinel shows a high affinity and adsorption rate toward anionic dyes Congo Red, Methyl Orange, and Methyl Blue. The maximum adsorption capacity of MgAl2O4 spinel toward these three anionic dyes are 2721.6 mg g−1 for Congo Red, 2469.7 mg g−1 for Methyl Orange, and 6771.9 mg g−1 for Methyl Blue, respectively. [Figure not available: see fulltext.]

    DOI: 10.1007/s10971-018-4781-0

    Web of Science

    Scopus

  48. The gravitationally unstable gas disk of a starburst galaxy 12 billion years ago Reviewed

    Tadaki K., Iono D., Yun M.S., Aretxaga I., Hatsukade B., Hughes D.H., Ikarashi S., Izumi T., Kawabe R., Kohno K., Lee M., Matsuda Y., Nakanishi K., Saito T., Tamura Y., Ueda J., Umehata H., Wilson G.W., Michiyama T., Ando M., Kamieneski P.

    Nature   Vol. 560 ( 7720 ) page: 613 - 616   2018.8

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Nature  

    Galaxies in the early Universe that are bright at submillimetre wavelengths (submillimetre-bright galaxies) are forming stars at a rate roughly 1,000 times higher than the Milky Way. A large fraction of the new stars form in the central kiloparsec of the galaxy1–3, a region that is comparable in size to the massive, quiescent galaxies found at the peak of cosmic star-formation history4 and the cores of present-day giant elliptical galaxies. The physical and kinematic properties inside these compact starburst cores are poorly understood because probing them at relevant spatial scales requires extremely high angular resolution. Here we report observations with a linear resolution of 550 parsecs of gas and dust in an unlensed, submillimetre-bright galaxy at a redshift of z = 4.3, when the Universe was less than two billion years old. We resolve the spatial and kinematic structure of the molecular gas inside the heavily dust-obscured core and show that the underlying gas disk is clumpy and rotationally supported (that is, its rotation velocity is larger than the velocity dispersion). Our analysis of the molecular gas mass per unit area suggests that the starburst disk is gravitationally unstable, which implies that the self-gravity of the gas is stronger than the differential rotation of the disk and the internal pressure due to stellar-radiation feedback. As a result of the gravitational instability in the disk, the molecular gas would be consumed by star formation on a timescale of 100 million years, which is comparable to gas depletion times in merging starburst galaxies5.

    DOI: 10.1038/s41586-018-0443-1

    Scopus

  49. On-line Redox Derivatization Liquid Chromatography Using a Carbon Monolithic Column Reviewed

    Miyashita Ken, Tanaka Ryo, Hasegawa George, Nakanishi Kazuki, Morioka Kazuhiro, Zeng Hulie, Kato Shungo, Uchiyama Katsumi, Saitoh Kazunori, Shibukawa Masami, Nakajima Hizuru

    BUNSEKI KAGAKU   Vol. 67 ( 8 ) page: 469 - 478   2018.8

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Web of Science

  50. Superflexible Multifunctional Polyvinylpolydimethylsiloxane-Based Aerogels as Efficient Absorbents, Thermal Superinsulators, and Strain Sensors Reviewed

    Zu G., Kanamori K., Maeno A., Kaji H., Nakanishi K.

    Angewandte Chemie - International Edition   Vol. 57 ( 31 ) page: 9722 - 9727   2018.7

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Angewandte Chemie - International Edition  

    Aerogels are porous materials but show poor mechanical properties and limited functionality, which significantly restrict their practical applications. Preparation of highly bendable and processable aerogels with multifunctionality remains a challenge. Herein we report unprecedented superflexible aerogels based on polyvinylpolydimethylsiloxane (PVPDMS) networks, PVPDMS/polyvinylpolymethylsiloxane (PVPMS) copolymer networks, and PVPDMS/PVPMS/graphene nanocomposites by a facile radical polymerization/hydrolytic polycondensation strategy and ambient pressure drying or freeze drying. The aerogels have a doubly cross-linked organic–inorganic network structure consisting of flexible polydimethylsiloxanes and hydrocarbon chains with tunable cross-linking density, tunable pore size and bulk density. They have a high hydrophobicity and superflexibility and combine selective absorption, efficient separation of oil and water, thermal superinsulation, and strain sensing.

    DOI: 10.1002/anie.201804559

    Scopus

    PubMed

  51. Superflexible Multifunctional Polyvinylpolydimethylsiloxane-Based Aerogels as Efficient Absorbents, Thermal Superinsulators, and Strain Sensors Reviewed

    Guoqing Zu, Kazuyoshi Kanamori, Ayaka Maeno, Hironori Kaji, Kazuki Nakanishi

    Angewandte Chemie   Vol. 130 ( 31 ) page: 9870 - 9875   2018.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    DOI: 10.1002/ange.201804559

  52. Comprehensive studies on phosphoric acid treatment of porous titania toward titanium phosphate and pyrophosphate monoliths with pore hierarchy and a nanostructured pore surface Reviewed

    Zhu Y., Hasegawa G., Kanamori K., Nakanishi K.

    Inorganic Chemistry Frontiers   Vol. 5 ( 6 ) page: 1397 - 1404   2018.6

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Inorganic Chemistry Frontiers  

    Simple post-treatments of the porous titania monolith in varied concentrations of phosphoric acid solution provide a series of monolithic titanium phosphates (TiPs) with a hierarchically porous structure together with an exquisite macropore surface. Depending on the reaction conditions, platy crystallites composed of either Ti2O3(H2PO4)2·2H2O, Ti(HPO4)2·H2O (α-TiP), or Ti2O(PO4)2·2H2O (π-TiP) are generated on the macropore skeleton via a dissolution and reprecipitation process, which forms distinct wrinkled surface morphologies. In addition, the treatments effectively suppress the shrinkage during drying, leading to lower bulk density. Post-calcination in air yields porous titanium pyrophosphates preserving the intricate porous architecture in some cases. Notably, the hierarchically porous TiP2O7 monoliths prepared from the α-TiP precursors have a good thermal robustness related to bulk density.

    DOI: 10.1039/c8qi00146d

    Scopus

  53. Iron(III) oxyhydroxide and oxide monoliths with controlled multiscale porosity: synthesis and their adsorption performance Reviewed

    Hara, Yosuke, Kanamori, Kazuyoshi, Morisato, Kei, Miyamoto, Riichi, Nakanishi, Kazuki

    Journal of Materials Chemistry a   Vol. 6 ( 19 ) page: 9041 - 9048   2018.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry  

    Iron(iii) oxyhydroxide and oxide monoliths with controlled multiscale porosity have been successfully fabricated via the sol-gel process accompanied by phase separation. The size of macropores was controlled by synthesis parameters such as starting compositions. The as-dried iron(iii) oxyhydroxide monoliths were amorphous and possessed surface areas over 340 m2 g-1, of which mesostructures could be further controlled by a heat-treatment at 250-350 °C without collapse of macrostructures and monolithic forms. When the as-dried gel was heated at 300 °C, the resultant gel transformed to crystalline α-Fe2O3 and exhibited a specific surface area of 124 m2 g-1. Heat-treatment at 350 °C resulted in the broadened size distribution of mesopores. The adsorption behavior of Congo red has revealed that the interconnected macroporous structure contributed to faster diffusion and better accessibility in a continuous flow-through set up, and the crack-free monolithic forms accounted for an advantageous use of the flow-through adsorbents.

    DOI: 10.1039/c8ta01691g

    Web of Science

    Scopus

  54. Versatile Double-Cross-Linking Approach to Transparent, Machinable, Supercompressible, Highly Bendable Aerogel Thermal Superinsulators Reviewed

    Zu G., Kanamori K., Shimizu T., Zhu Y., Maeno A., Kaji H., Nakanishi K., Shen J.

    Chemistry of Materials   Vol. 30 ( 8 ) page: 2759 - 2770   2018.4

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Chemistry of Materials  

    A facile yet versatile approach to transparent, highly flexible, machinable, superinsulating organic-inorganic hybrid aerogels is presented. This method involves radical polymerization of a single alkenylalkoxysilane to obtain polyalkenylalkoxysilane, and subsequent hydrolytic polycondensation to afford a homogeneous, doubly cross-linked nanostructure consisting of polysiloxanes and hydrocarbon polymer units. Here we demonstrate that novel aerogels based on polyvinylpolysilsesquioxane (PVPSQ), polyallylpolysilsesquioxane (PAPSQ), polyvinylpolymethylsiloxane (PVPMS), and polyallylpolymethylsiloxane (PAPMS) are facilely prepared via this approach from vinyltrimethoxysilane (VTMS; or vinyltriethoxysilane, VTES), allyltrimethoxysilane (ATMS; or allyltriethoxysilane, ATES), vinylmethyldimethoxysilane (VMDMS), and allylmethyldimethoxysilane (AMDMS), respectively. These aerogels combine low density, uniform nanopores, high transparency, supercompressibility, high bendability, excellent machinability, and thermal superinsulation (λ = 14.5-16.4 mW m-1 K-1). More importantly, transparent, superflexible, superinsulating aerogels are obtained with PVPMS and PAPMS via highly scalable ambient pressure drying without any solvent-exchange and modifications for the first time. This work will open a new way to transparent, highly flexible porous materials, promising in the practical applications of thermal superinsulators, adsorbents, sensors, etc.

    DOI: 10.1021/acs.chemmater.8b00563

    Scopus

  55. Transparent, Superflexible Doubly Cross-Linked Polyvinylpolymethylsiloxane Aerogel Superinsulators via Ambient Pressure Drying Reviewed

    Zu G., Shimizu T., Kanamori K., Zhu Y., Maeno A., Kaji H., Shen J., Nakanishi K.

    ACS Nano   Vol. 12 ( 1 ) page: 521 - 532   2018.1

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:ACS Nano  

    Aerogels have many attractive properties but are usually costly and mechanically brittle, which always limit their practical applications. While many efforts have been made to reinforce the aerogels, most of the reinforcement efforts sacrifice the transparency or superinsulating properties. Here we report superflexible polyvinylpolymethylsiloxane, (CH2CH(Si(CH3)O2/2))n, aerogels that are facilely prepared from a single precursor vinylmethyldimethoxysilane or vinylmethyldiethoxysilane without organic cross-linkers. The method is based on consecutive processes involving radical polymerization and hydrolytic polycondensation, followed by ultralow-cost, highly scalable, ambient-pressure drying directly from alcohol as a drying medium without any modification or additional solvent exchange. The resulting aerogels and xerogels show a homogeneous, tunable, highly porous, doubly cross-linked nanostructure with the elastic polymethylsiloxane network cross-linked with flexible hydrocarbon chains. An outstanding combination of ultralow cost, high scalability, uniform pore size, high surface area, high transparency, high hydrophobicity, excellent machinability, superflexibility in compression, superflexibility in bending, and superinsulating properties has been achieved in a single aerogel or xerogel. This study represents a significant progress of porous materials and makes the practical applications of transparent flexible aerogel-based superinsulators realistic.

    DOI: 10.1021/acsnano.7b07117

    Scopus

    PubMed

  56. On-line redox derivatization liquid chromatography using a carbon monolithic column Reviewed

    Miyashita K., Tanaka R., Hasegawa G., Nakanishi K., Morioka K., Zeng H., Kato S., Uchiyama K., Saitoh K., Shibukawa M., Nakajima H.

    Bunseki Kagaku   Vol. 67 ( 8 ) page: 469 - 478   2018

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Bunseki Kagaku  

    A macroporous resorcinol-formaldehyde (RF) xerogel was synthesized via sol–gel reaction, accompanied by phase separation; a graphitized carbon monolith was then prepared by calcining the RF xerogel at a relatively low temperature (1200 °C) utilizing catalytic graphitization. The retention behaviors of metal-EDTA complexes on the carbon monolithic column were investigated. The carbon monolith exhibited catalytic activity for redox reactions, like porous graphitic carbon packing materials do; they oxidized Co(II)-EDTA to Co(III)-EDTA during elution. Their redox activity could be modified by treating with an eluent containing an oxidizing or reducing agent. A novel on-line redox derivatization HPLC system using a carbon monolithic column was developed for enhancing the separation selectivity. This on-line redox derivatization HPLC system consisted of two ODS columns as a separation column and one carbon monolithic column as redox derivatization unit placed between them. The Co(II)-EDTA migrated as its original oxidation state in the first ODS column, while it migrated as Co(III)-EDTA in the second ODS column, since Co(II)-EDTA was rapidly oxidized to Co(III)-EDTA in the carbon monolithic column. On the other hand, other metal-EDTA complexes migrated as their original oxidation states in these columns. Therefore, the Co-EDTA could be separated from the other metal-EDTA complexes. This on-line redox derivatization HPLC system was successfully used for determining the trace amount of cobalt in a reference copper alloy.

    DOI: 10.2116/bunsekikagaku.67.469

    Scopus

  57. Synthesis of a hierarchically porous niobium phosphate monolith by a sol-gel method for fructose dehydration to 5-hydroxymethylfurfural Reviewed

    Gao D.M., Zhao B., Liu H., Morisato K., Kanamori K., He Z., Zeng M., Wu H., Chen J., Nakanishi K.

    Catalysis Science and Technology   Vol. 8 ( 14 ) page: 3675 - 3685   2018

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Catalysis Science and Technology  

    Hierarchically porous niobium phosphate (NbP) was synthesised via a sol-gel method accompanied by phase separation and employed as a catalyst for fructose dehydration. The niobium precursor was prepared by digesting ammonium niobate(v) oxalate in aqueous H2O2 with citric acid as a chelating agent to prevent the precipitation of niobium hydroxide. Poly(acrylamide) and poly(ethylene glycol) were used as phase separation inducers to produce co-continuous macropores and gel skeletons. The NbP sample calcined at 600 °C for 8 h had a high surface area (SBET ∼140 m2 g-1) and large acidity (0.84 mmol-NH3 g-1). The NbP monolith was amorphous after calcination at 600 °C and transformed into an α-NbOPO4 phase at 1000 °C. The NbP monolith calcined at 600 °C was an efficient acid catalyst for the dehydration of fructose to 5-hydroxymethylfurfural in water (70% yield) or in aqueous dimethyl sulfoxide (90% yield). The productivity of HMF reached 7.3 × 10-2 mol h-1 per kg-solution at an initial fructose concentration of 10.0 wt% in water with a catalyst loading of 2.0 wt%.

    DOI: 10.1039/c8cy00803e

    Scopus

  58. The effect of exercise frequency on neuropathic pain and pain-related cellular reactions in the spinal cord and midbrain in a rat sciatic nerve injury model. Reviewed

    Sumizono M, Sakakima H, Otsuka S, Terashi T, Nakanishi K, Ueda K, Takada S, Kikuchi K

    Journal of pain research   Vol. 11   page: 281 - 291   2018

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.2147/JPR.S156326

    PubMed

  59. Synthesis and characterization of monolithic ZnAl2O4 spinel with well-defined hierarchical pore structures via a sol-gel route Reviewed

    Guo Xingzhong, Yin Pengan, Lei Wei, Yang Hui, Kanamori Kazuyoshi, Nakanishi Kazuki

    JOURNAL OF ALLOYS AND COMPOUNDS   Vol. 727   page: 763 - 770   2017.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Alloys and Compounds  

    Hierarchically porous ZnAl2O4 spinel monolith derived from ionic precursors has been successfully prepared via the sol-gel route accompanied by phase separation in the presence of poly (ethylene oxide) (PEO) and propylene oxide (PO). Appropriate amounts of PEO as a phase-separation inducer and PO as a gelation mediator allow the formation of the xerogel with bicontinuous macrostructure and a monolithic shape. The macropore size of the resultant dried gel is mainly distributed in the range of 0.2–1 μm, and the whole porosity is about 65%. The dried gel is constructed by crystalline Zn–Al hydrotalcite, becoming amorphous after heat-treated at 300–500 °C in air, and is further transformed into single phase ZnAl2O4 spinel with plate-like shape at 600 °C. The macroporous structure is well maintained while the porosity increases to 75% and the surface area rises to 109 m2 g−1 after heat-treatment.

    DOI: 10.1016/j.jallcom.2017.08.172

    Web of Science

    Scopus

  60. Aerogels from Chloromethyltrimethoxysilane and Their Functionalizations Reviewed

    Kimura, Tomoki, Shimizu, Taiyo, Kanamori, Kazuyoshi, Maeno, Ayaka, Kaji, Hironori, Nakanishi, Kazuki

    Langmuir   Vol. 33 ( 48 ) page: 13841 - 13848   2017.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    Reactions of "chloromethyltriinethoxysilane (CMTMS) and its derived colloidal network polychlorome-thylsilsesquioxane (PCMSQ) have been investigated to extend the material design strategy toward functionalized and mechanically reinforced aerogels. In a carefully designed sol gel system, CMTMS has afforded transparent aerogels in the presence of cationic surfactant. The surface chloromethyl groups with polarity and reactivity are shown to be useful for supporting nanostructures, with photoluminescent carbon dots (C-dots) prepared from polyethylenimine and citric acid as an example. Furthermore, since nucleophilic substitution (S(N)2) reactions on the surface chloromethyl groups are found to control the equilibrium of formation/dissociation of siloxane bonds, a new gelation strategy triggered by S(N)2 reactions in sol-gel has been developed. In the presence of nucleophilic organic species such as polyamines, a hybrid network consisting of PCMSQ cross-linked with a polyamine nucleophile can be prepared to enhance mechanical properties of aerogel.

    DOI: 10.1021/acs.langmuir.7b03013

    Web of Science

    Scopus

    PubMed

  61. Polymer-assisted shapeable synthesis of porous frameworks consisting of silica nanoparticles with mechanical property tuning Reviewed

    Sato Kanako, Ishii Kanji, Oaki Yuya, Nakanishi Kazuki, Imai Hiroaki

    POLYMER JOURNAL   Vol. 49 ( 12 ) page: 825 - 830   2017.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Polymer Journal  

    We report the shapeable synthesis of porous silica frameworks using polyacrylamide (PAAm) gel as an organic template and hydrolyzed silicon alkoxide as a silica source. Macroscopically shaped porous frameworks - such as plates, tablets and sheets - comprised of 20- to 40-nm diameter silica particles are obtained via PAAm-silica precursor gels. The mechanical properties (i.e., hardness and Young's modulus) of the silica frameworks depend on the packing density and are controlled by changing the silica content in PAAm gels.

    DOI: 10.1038/pj.2017.62

    Web of Science

    Scopus

  62. Synthesis, Reduction, and Electrical Properties of Macroporous Monolithic Mayenite Electrides with High Porosity Reviewed

    Wang R., Yang H., Lu Y., Kanamori K., Nakanishi K., Guo X.

    ACS Omega   Vol. 2 ( 11 ) page: 8148 - 8155   2017.11

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:ACS Omega  

    Room-temperature stable macroporous mayenite electride (C12A7:e-) has been successfully prepared via a sol-gel method accompanied by phase separation, followed by heat-treatment and reduction processes. The obtained xerogel monoliths possess controllable macrostructure and a porosity of more than 60%, depending on adjusting the amount of poly(ethylene oxide) as a phase separation inducer. Heat-treatment allows the formation of multicrystals Ca12Al14O32Cl2 and Ca12Al14O33 (C12A7), and the porosity increases to 78.67% after being heat-treated at 1100 °C. Further reduction promotes the transformation from Ca12Al14O32Cl2 or C12A7 to C12A7:e- as well as the conversion from an insulator to a semiconductive electride. The carrier concentration of the electride reaches 3.029 × 1018 cm-3 after being reduced at 1100 °C under Ar atmosphere, and the porosity still remains 66%. The macrostructure of the resultant mayenite electride before and after heat-treatment and reduction is perfectly preserved, indicating that the obtained macroporous monolithic mayenite electride could be utilized in the electronic components.

    DOI: 10.1021/acsomega.7b01121

    Scopus

    PubMed

  63. Very Compact Millimeter Sizes for Composite Star-forming/AGN Submillimeter Galaxies Reviewed

    Ikarashi S., Caputi K.I., Ohta K., Ivison R.J., Lagos C.D.P., Bisigello L., Hatsukade B., Aretxaga I., Dunlop J.S., Hughes D.H., Iono D., Izumi T., Kashikawa N., Koyama Y., Kawabe R., Kohno K., Motohara K., Nakanishi K., Tamura Y., Umehata H., Wilson G.W., Yabe K., Yun M.S.

    Astrophysical Journal Letters   Vol. 849 ( 2 )   2017.11

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Astrophysical Journal Letters  

    We report the study of the far-infrared (IR) sizes of submillimeter galaxies (SMGs) in relation to their dustobscured star formation rate (SFR) and active galactic nuclei (AGN) presence, determined using mid-IR photometry. We determined the millimeter-wave (λobs = 1100 μm) sizes of 69 Atacama Large Millimeter/ submillimeter Array (ALMA)-identified SMGs, selected with ≥10 δ confidence on ALMA images (F1100 μm = 1.7-7.4 mJy). We found that all of the SMGs are located above an avoidance region in the sizeflux plane, as expected by the Eddington limit for star formation. In order to understand what drives the different millimeter-wave sizes in SMGs, we investigated the relation between millimeter-wave size and AGN fraction for 25 of our SMGs at z=1-3. We found that the SMGs for which the mid-IR emission is dominated by star formation or AGN have extended millimeter-sizes, with respective median Rc,e = 1.6-0.21+0.34 and 1.5 -0.24+0.93 kpc. Instead, the SMGs for which the mid-IR emission corresponds to star-forming/AGN composites have more compact millimeter-wave sizes, with median Rc,e1.0 -0.20+0.20kpc. The relation between millimeter-wave size and AGN fraction suggests that this size may be related to the evolutionary stage of the SMG. The very compact sizes for composite star-forming/AGN systems could be explained by supermassive black holes growing rapidly during the SMG coalescing, star-formation phase.

    DOI: 10.3847/2041-8213/aa9572

    Scopus

  64. Aerogels from chloromethyltrimethoxysilane and their functionalizations Reviewed

    Tomoki KIMURA, Taiyo SHIMIZU, Kazuyoshi KANAMORI, Ayaka MAENO, Hironori KAJI, Kazuki NAKANISHI

    Langumuir     2017.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  65. Nanostructured titanium phosphates prepared via hydrothermal reaction and their electrochemical Li- and Na-ion intercalation properties Reviewed

    Zhu, Y., Hasegawa, G., Kanamori, K., Kiyomura, T., Kurata, H., Hayashi, K., Nakanishi, K.

    Crystengcomm   Vol. 19 ( 31 ) page: 4551 - 4560   2017.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    In this report, we demonstrate a facile and versatile methodology for synthesizing a series of titanium phosphates (TiPs) with various morphologies. The hydrothermal reactions of TiO2 in different concentrations of H3PO4 aq. yield 4 types of crystal structures with diverse shapes, such as nanoparticles, nanorods and nanosheets, which are assembled into a variety of flower-like morphologies. The dependence of the crystal phases and morphologies of TiPs on the synthesis conditions have been comprehensively investigated. This synthetic process can be further extended to other TiP derivatives incorporated with guest cations (e.g. NH4+ and Na+) simply by adding the corresponding phosphate salts to the starting composition, which leads to the morphological variation associated with the change of the crystal phase. The mechanism for the formation of the TiPs is discussed in terms of the stable Ti-based ion species relying on the pH value of the reaction solution. In addition, the correlation between the crystal structures and morphologies of TiPs and their electrochemical Li- and Na-ion storage behaviors are demonstrated as well, which discloses the different tendencies of morphological effects between the Li- and Na-ion systems.

    DOI: 10.1039/c7ce01123g

    Web of Science

    Scopus

  66. Ultralow-Density, Transparent, Superamphiphobic Boehmite Nanofiber Aerogels and Their Alumina Derivatives (vol 27, pg 3, 2015) Reviewed

    Hayase Gen D, Nonomura Kazuya, Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki

    CHEMISTRY OF MATERIALS   Vol. 29 ( 12 ) page: 5413 - 5413   2017.6

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/acs.chemmater.7b02431

    Web of Science

  67. Fabrication of hydrophobic polymethylsilsesquioxane aerogels by a surfactant-free method using alkoxysilane with ionic group Reviewed

    Hayase, Gen, Nagayama, Shuya, Nonomura, Kazuya, Kanamori, Kazuyoshi, Maeno, Ayaka, Kaji, Hironori, Nakanishi, Kazuki

    Journal of Asian Ceramic Societies   Vol. 5 ( 2 ) page: 104 - 108   2017.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier B.V.  

    Phase separation control is an important factor to prepare a porous monolith by an aqueous sol–gel reaction. Here, we report a surfactant-free synthesis method to obtain hydrophobic polymethylsilsesquioxane aerogels by copolymerizing a cationic-functionalized alkoxysilane N-trimethoxysilylpropyl-N,N,N-trimethylammonium chloride. The resultant materials have low-density, high visible-light transmittance, and high thermal insulating equivalent to those of prepared under the presence of surfactant.

    DOI: 10.1016/j.jascer.2017.02.003

    Web of Science

    Scopus

  68. Functionalization of hierarchically porous silica monoliths with polyethyleneimine (PEI) for CO2 adsorption Reviewed

    Guo, Xingzhong, Ding, Li, Kanamori, Kazuyoshi, Nakanishi, Kazuki, Yang, Hui

    Microporous and Mesoporous Materials   Vol. 245   page: 51 - 57   2017.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    A novel CO2 sorbent was prepared by modifying polyethyleneimine (PEI) on hierarchically porous silica (HPS) monoliths with well-defined macro-mesopores through wet impregnation method. HPS monoliths before and after functionalization were characterized by scanning electron microscopy (SEM), differential thermal analysis/thermogravimetry (DTA/TG), fourier transform infrared spectroscopy (FT-IR) and nitrogen adsorption/desorption analysis (BET), and the CO2 adsorption-regeneration properties of as synthesized sorbents were investigated by thermogravimetric analysis (TG). The effects of loaded PEI amount as well as adsorption temperature and CO2 partial pressure on the CO2 adsorption performance of the as-prepared sorbents were also studied. The results showed that the porous structure of HPS-PEI sorbents was preserved after functionalization, while the specific surface area and pore volume decreased with increasing amount of amines to some extent. The use of PEI had a remarkable improvement on the CO2 adsorption capacity. With the increasing amount of PEI loaded, the CO2 adsorption capacity improved significantly. The highest CO2 adsorption capacity of 2.44 mmol (g sorbent)-1 was obtained at 75 degrees C in the CO2 partial pressure of 100 kPa for the HPS loaded with 60 wt% PEI. Adsorption/desorption cycles indicated that the PEI-modified HPS sorbents had a good stability and regeneration. (C) 2017 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.micromeso.2017.02.076

    Web of Science

    Scopus

  69. Transparent Ethenylene-Bridged Polymethylsiloxane Aerogels: Mechanical Flexibility and Strength and Availability for Addition Reaction Reviewed

    Shimizu T., Kanamori K., Maeno A., Kaji H., Doherty C.M., Nakanishi K.

    Langmuir   Vol. 33 ( 18 ) page: 4543 - 4550   2017.5

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Langmuir  

    Transparent, low-density ethenylene-bridged polymethylsiloxane [Ethe-BPMS, O2/2(CH3)Si-CHCH-Si(CH3)O2/2] aerogels from 1,2-bis(methyldiethoxysilyl)ethene have successfully been synthesized via a sol-gel process. A two-step sol-gel process composed of hydrolysis under acidic conditions and polycondensation under basic conditions in a liquid surfactant produces a homogeneous pore structure based on cross-linked nanosized colloidal particles. Visible-light transmittance of the aerogels varies with the concentration of the base catalyst and reaches as high as 87% (at a wavelength of 550 nm for a 10 mm thick sample). Gelation and aging temperature strongly affect the deformation behavior of the resultant aerogels against uniaxial compression, and the obtained aerogels prepared at 80 °C show high elasticity after being unloaded. This highly resilient behavior is primarily derived from the rigidity of ethenylene groups, which is confirmed by a comparison with other aerogels with similar molecular structures, ethylene-bridged polymethylsiloxane and polymethylsilsesquioxane. Applicability of the addition reaction using a Diels-Alder reaction of benzocyclobutene has also been investigated, revealing that a successful addition takes place on the ethenylene linkings, which is verified using Raman and solid-state NMR spectroscopies. Insights into the effect of molecular structure on mechanical properties and the availability of surface functionalization provided in this study are important for realizing transparent aerogels with the desired functionality.

    DOI: 10.1021/acs.langmuir.7b00434

    Scopus

    PubMed

  70. Silicone-Based Organic–Inorganic Hybrid Aerogels and Xerogels Reviewed

    Shimizu T., Kanamori K., Nakanishi K.

    Chemistry - A European Journal   Vol. 23 ( 22 ) page: 5176 - 5187   2017.4

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Chemistry - A European Journal  

    Aerogels are attracting increasing attention due to their high thermal insulation ability as well as unique properties such as high porosity, surface area, and transparency. However, low mechanical strengths, originating from their unique porous structure, impede handling, formability, mass production, and extended applications. This minireview focuses on the strengthening of aerogels by several organic–inorganic hybridization strategies. In particular, successful strengthening methodologies, which employ organo-substituted alkoxysilanes as the single precursor for the sol–gel preparations, developed by the authors are highlighted. Moreover, improvements in compressive strength and elasticity lead to monolithic aerogel-like xerogels through ambient pressure drying. Correlations between structures in different length scales (e.g., molecular, network, and pore structure levels) and resultant mechanical properties are discussed for further understandings and better design toward mechanically improved aerogels/xerogels and their applications.

    DOI: 10.1002/chem.201603680

    Scopus

    PubMed

  71. Transparent polyvinylsilsesquioxane aerogels: investigations on synthetic parameters and surface modification Reviewed

    Shimizu T., Kanamori K., Nakanishi K.

    Journal of Sol-Gel Science and Technology   Vol. 82 ( 1 ) page: 2 - 14   2017.4

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Sol-Gel Science and Technology  

    Abstract: Systematic investigations on the effect of synthetic conditions onto the properties of polyvinylsilsesquioxane (CH2=CHSiO3/2) aerogels have been conducted. As previously reported, transparent polyvinylsilsesquioxane aerogels can be obtained by utilizing a liquid surfactant as a solvent and a two-step sol–gel reaction involving hydrolysis catalyzed by a strong acid and subsequent polycondensation by a strong base. In this study, effects of base catalyst, gelation and aging conditions, amount of surfactant and concentration of acid catalyst have been investigated. With the optimized synthetic condition, the value of light transmittance reaches as high as 70% (at the wavelength of 550 nm for a 10-mm thick sample). Applicability of addition reactions utilizing thiol-ene reactions and hydrosilylation has also been surveyed. Thiol-ene reactions are relatively effective and can modify surface hydrophobicity and mechanical properties of polyvinylsilsesquioxane aerogels. In the case of hydrosilylation, a partial addition of a hydrosilane compound onto the polyvinylsilsesquioxane gel surface can be observed. Addition reactions, in particular thiol-ene reactions, are found to be profitable for implementing chemical functionality on the transparent aerogels. Graphical Abstract: [InlineMediaObject not available: see fulltext.]

    DOI: 10.1007/s10971-017-4339-6

    Scopus

  72. Highly Flexible Hybrid Polymer Aerogels and Xerogels Based on Resorcinol-Formaldehyde with Enhanced Elastic Stiffness and Recoverability: Insights into the Origin of Their Mechanical Properties Reviewed

    Hasegawa, George, Shimizu, Taiyo, Kanamori, Kazuyoshi, Maeno, Ayaka, Kaji, Hironori, Nakanishi, Kazuki

    Chemistry of Materials   Vol. 29 ( 5 ) page: 2122 - 2134   2017.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    Flexible low-density materials, such as aerogels and polymer foams, have received increasing attention as energy absorbers and cushions that protect artificial products and human bodies. Microscopic geometry is a crucial factor determining their mechanical functions, i.e. strength and toughness (flexibility). However, it is a formidable challenge to combine these two properties because they are mutually elusive in general; stiff materials are brittle, while flexible ones are soft. Here, we demonstrate lightweight porous polymeric materials based on a common phenolic resin, resorcinol-formaldehyde (RF) gels, with salient combinatorial properties of high stiffness (up to 100 MPa) and good recoverable compressibility (against 80-90% strain), which can deliver remarkable energy absorption and dissipation performances repetitively. The detailed investigation reveals that the unique mechanical features originate from the synergetic effect of interdigitated hard and soft components in polymer matrices as well as exquisitely designed highly branched microstructures both generated through the spontaneous supramolecular self-assembly of the nonionic block copolymer (F127) and RF oligomer, which is essentially analogous to how natural organisms create biological structural materials, e.g. nacre and bone.

    DOI: 10.1021/acs.chemmater.6b04706

    Web of Science

    Scopus

  73. Amine/Hydrido Bifunctional Nanoporous Silica with Small Metal Nanoparticles Made Onsite: Efficient Dehydrogenation Catalyst Reviewed

    Zhu, Yang, Nakanishi, Takahiro, Kanamori, Kazuyoshi, Nakanishi, Kazuki, Ichii, Shun, Iwaida, Kohji, Masui, Yu, Kamei, Toshiyuki, Shimada, Toyoshi, Kumamoto, Akihito, Ikuhara, Yumi H., Jeon, Mina, Hasegawa, George, Tafu, Masamoto, Yoon, Chang Won, Asefa, Tewodros

    Acs Applied Materials & Interfaces   Vol. 9 ( 1 ) page: 36 - 41   2017.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    Multifunctional catalysts are of great interest in catalysis because their multiple types of catalytic or functional groups can cooperatively promote catalytic transformations better than their constituents do individually. Herein we report a new synthetic route involving the surface functionalization of nanoporous silica with a rationally designed and synthesized dihydrosilane (3-aminopropylmethylsilane) that leads to the introduction of catalytically active grafted organoamine as well as single metal atoms and ultrasmall Pd or Ag-doped Pd nanoparticles via on-site reduction of metal ions. The resulting nanomaterials serve as highly effective bifunctional dehydrogenative catalysts for generation of H-2 from formic acid.

    DOI: 10.1021/acsami.6b12972

    Web of Science

    Scopus

    PubMed

  74. Grafted Polymethylhydrosiloxane on Hierarchically Porous Silica Monoliths: A New Path to Monolith-Supported Palladium Nanoparticles for Continuous Flow Catalysis Applications Reviewed

    Pelisson, Carl-Hugo, Nakanishi, Takahiro, Zhu, Yang, Morisato, Kei, Kamei, Toshiyuki, Maeno, Ayaka, Kaji, Hironori, Muroyama, Shunki, Tafu, Masamoto, Kanamori, Kazuyoshi, Shimada, Toyoshi, Nakanishi, Kazuki

    Acs Applied Materials & Interfaces   Vol. 9 ( 1 ) page: 406 - 412   2017.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    Polyrnethylhydrosiloxane has been grafted on the surface of a hierarchically porous silica monolith using a facile catalytic reaction between Si-H and silanol to anchor the polymer. This easy methodology leads to the functionalization of the surface of a silica monolith, where a large amount of free Si-H bonds remain available for reducing metal ions in solution. Palladium nanoparticles of 15 nm have been synthesized homogeneously inside the mesopores of the monolith without any stabilizers, using a flow of a solution containing Pd2+. This monolith was used as column-type fixed bed catalyst for continuous flow hydrogenation of styrene and selective hydrogenation of 3-hexyn-1-ol, in each case without a significant decrease of the catalytic activity after several hours or days. Conversion, selectivity, and stereoselectivity of the alkyne hydrogenation can be tuned by flow rates of hydrogen and the substrate solution, leading to high productivity (1.57 mol g(Pd)(-1) h(-1)) of the corresponding cis-alkene.

    DOI: 10.1021/acsami.6b12653

    Web of Science

    Scopus

    PubMed

  75. Low-density, transparent aerogels and xerogels based on hexylene-bridged polysilsesquioxane with bendability Reviewed

    Aoki, Yosuke, Shimizu, Taiyo, Kanamori, Kazuyoshi, Maeno, Ayaka, Kaji, Hironori, Nakanishi, Kazuki

    Journal of Sol-Gel Science and Technology   Vol. 81 ( 1 ) page: 42 - 51   2017.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER  

    Low-density, transparent aerogels based on a hexylene-bridged polysilsesquioxane ([O1.5Si-(CH2)(6)SiO1.5](n)) network have been prepared for the first time via a simple sol-gel process. An optimized base-catalyzed onestep hydrolysis-polycondensation process of a bridged alkoxysilane precursor 1,6-bis(trimethoxysilyl) hexane in a low-polarity solvent N,N-dimethylformamide allows for the formation of a pore structure of a length scale of several tens nanometers, resulting in low-density, transparent aerogels after supercritical drying. Because of the incorporated organic moiety that bridges the silicon atoms in the network, these aerogels show higher flexibility and strength against compression and bending as compared to silica aerogel counterparts. In addition, minimizing the residual silanol groups in the network by a surface modification with hexamethyldisilazane has further improved resilience after compression and bending flexibility and strength, due to the decreased chance of the irreversible formation of the siloxane bonds upon compression. The resulting trimethylsilylated hydrophobic gels have been subjected to ambient pressure drying to obtain xerogels, resulting in low-density (0.13 g cm(-3), 90 % porosity), transparent (71 % transmittance) xerogels. These results are promising for the development of transparent thermal superinsulators applicable to window insulating systems that manage heat transfer in a more efficient way.

    DOI: 10.1007/s10971-016-4077-1

    Web of Science

    Scopus

  76. Effects of nanostructured biosilica on rice plant mechanics Reviewed

    Sato, Kanako, Ozaki, Noriaki, Nakanishi, Kazuki, Sugahara, Yoshiyuki, Oaki, Yuya, Salinas, Christopher, Herrera, Steven, Kisailus, David, Imai, Hiroaki

    Rsc Advances   Vol. 7 ( 22 ) page: 13065 - 13071   2017

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    Nanostructured amorphous silica in rice plants (biosilica or plant opal) plays an important role in plant growth related to food production. However, the same silica has a structural supporting role as well that has not been uncovered. The current study focuses on the structural design of the two main types of biosilicas in rice plants for the improvement of their mechanical properties. One structural motif is platelike silicas, which cover most of the surfaces of leaf blades. Another is fan-shaped silicas, which are aligned inside leaf blades, providing a stiff backbone. These biosilica structures consist of 10-100 nm diameter nanoparticles. The mechanical properties, such as hardness and Young's modulus, of the biosilicas are associated with their relative density. Thus, the rice plant mechanics is inferred to be designed by changing the packing of the nanoparticles. Silica plates consisting of loosely packed particles have relatively low density and high flexibility enabling coverage of leaf blade surfaces, while fan-shaped silicas, which consist of tightly packed nanoparticles, are rigid to support the leaf blades as a backbone.

    DOI: 10.1039/c6ra27317c

    Web of Science

    Scopus

  77. Highly Efficient Encapsulation of Ingredients in Poly(methyl methacrylate) Capsules Using a Superoleophobic Material Reviewed

    Takei, Takayuki, Araki, Kiyotaka, Terazono, Keita, Ozuno, Yoshihiro, Hayase, Gen, Kanamori, Kazuyoshi, Nakanishi, Kazuki, Yoshida, Masahiro

    Polymers & Polymer Composites   Vol. 25 ( 2 ) page: 129 - 134   2017

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ISMITHERS  

    Increasing the efficiency of encapsulation of ingredients into spherical capsules can decrease the manufacturing costs of the capsules. Ingredients can be encapsulated with high efficiency (&gt;99%) into nondegradable hard resin capsules prepared by polymerization of spherical droplets of trimethylolpropane trimethacrylate (TRIM) monomer placed on a superoleophobic material. Poly(methyl methacrylate) (PMMA) resin is a more versatile capsule material than poly-TRIM resin. In this study, the efficiency of encapsulation in PMMA resin capsules prepared from methyl methacrylate (MMA) monomer was investigated. To reduce the volatility of the MMA monomer, pre-polymerized MMA was used for capsule preparation. Although non-volatile a-tocopherol and doxorubicin could be encapsulated in the capsules with high efficiency by heat polymerization at 60 degrees C for 3 h, the efficiency for volatile tetradecane was much lower (approximately 60%) because it evaporated. Furthermore, even when using pre-polymerized MMA, more than 70% of the prepolymer evaporated during polymerization. To prevent the evaporation of tetradecane and the prepolymer, ultraviolet photopolymerization was adopted because it was faster and could be conducted at a lower temperature. The photopolymerization prevented the evaporation of the prepolymer and increased the efficiency of encapsulation of tetradecane (approximately 90% efficiency). This polymerization system is effective for encapsulation of ingredients in PMMA capsules with high efficiency.

    DOI: 10.1177/096739111702500202

    Web of Science

    Scopus

  78. Transparent Ethylene-Bridged Polymethylsiloxane Aerogels and Xerogels with Improved Bending Flexibility. Reviewed

    Shimizu T, Kanamori K, Maeno A, Kaji H, Nakanishi K

    Langmuir : the ACS journal of surfaces and colloids   Vol. 32 ( 50 ) page: 13427 - 13434   2016.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Langmuir  

    Transparent, monolithic aerogels with nanosized colloidal skeletons have been obtained from a single precursor of 1,2-bis(methyldiethoxysilyl)ethane (BMDEE) by adopting a liquid surfactant and a two-step process involving strong-acid, followed by strong-base, sol-gel reactions. This precursor BMDEE forms the ethylene-bridged polymethylsiloxane (EBPMS, O2/2(CH3)Si-CH2CH2-Si(CH3)O2/2) network, in which each silicon has one methyl, two bridging oxygens, and one bridging ethylene, exhibiting an analogous structure to that of the previously reported polymethylsilsesquioxane (PMSQ, CH3SiO3/2) aerogels having one methyl and three bridging oxygen atoms. Obtained aerogels consist of fine colloidal skeletons and show high visible-light transparency and a flexible deformation behavior against compression without collapse. Similar to the PMSQ aerogels, a careful tuning of synthetic conditions can produce low-density (0.19 g cm-3) and highly transparent (76% at 550 nm, corresponding to 10 mm thick samples) xerogels via ambient pressure drying by solvent evaporation due to their high strength and resilience against compression. Moreover, EBPMS aerogels exhibit higher bending strength and bending strain at break against the three-point bending mode compared to PMSQ aerogels. This improved bendability is presumably derived from the introduced ethylene-bridging parts, suggesting the potential for realizing transparent and bendable aerogels in such polysiloxane materials with organic linking units.

    DOI: 10.1021/acs.langmuir.6b03249

    Scopus

    PubMed

  79. Monolithic acidic catalysts for the dehydration of xylose into furfural Reviewed

    Yang Zhu, Kazuyoshi Kanamori, Nicolas Brun, Carl-Hugo Pelisson, Nirmalya Moitra, Francois Fajula, Vasile Hulea, Anne Galarneau, Kazuyuki Takeda, Kazuki Nakanishi

    CATALYSIS COMMUNICATIONS   Vol. 87   page: 112 - 115   2016.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    We report the application of hierarchically porous zirconium phosphate monoliths with high surface area as acidic heterogeneous catalysts for the dehydration of xylose into furfural. Analyses by NH3-temperature programmed desorption and P-31 solid state NMR reveal the presence of both Lewis and Bronsted acid sites in the as-synthesized zirconium phosphate monolith and that calcined at 600 degrees C. High accessibility and availability of the acidic sites and easy separation of the monolith from the liquid medium result in good catalytic activity (initial reaction rate for furfural production as 8.7 mmol g(cat)(-1) h(-1)) with easy handling of the catalyst. (C) 2016 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.catcom.2016.09.014

    Web of Science

    Scopus

  80. Transparent, Highly Insulating Polyethyl- and Polyvinylsilsesquioxane Aerogels: Mechanical Improvements by Vulcanization for Ambient Pressure Drying Reviewed

    Shimizu T., Kanamori K., Maeno A., Kaji H., Doherty C., Falcaro P., Nakanishi K.

    Chemistry of Materials   Vol. 28 ( 19 ) page: 6860 - 6868   2016.10

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Chemistry of Materials  

    Silica aerogels are unique porous materials possessing high visible-light transparency and low thermal conductivity. However, the practical applications are limited due to the native fragility of silica, and a lot of research focuses on the improvement of mechanical properties by organic-inorganic hybridization, and so forth. Here, the first synthesis of polyethylsilsesquioxane (PESQ; CH3CH2SiO1.5) and polyvinylsilsesquioxane (PVSQ; CH2 - CHSiO1.5) aerogels is reported. The resultant PESQ and PVSQ aerogels obtained through a two-step acid-base sol-gel reaction in a surfactant-based solution exhibit visible-light transmittance and flexibility against compression without collapsing. The microstructural variations of these aerogels are systematically investigated by positron annihilation lifetime spectroscopy (PALS) in order to clarify the differences in properties derived from substituent groups. Furthermore, a post cure on the PVSQ wet gel using a radical initiator induces polymerization of vinyl groups in the solid network, resulting in mechanically reinforced aerogels with higher compressive modulus and resilience. This chemical modification, similar to vulcanization in silicone rubber materials, helps to produce xerogels with comparable properties to those of aerogels via ambient pressure drying. Since the resultant xerogel obtained from the vulcanization of PVSQ shows sufficiently low thermal conductivity of 15.3 mW m-1 K-1, these novel polysilsesquioxane materials are promising for transparent aerogels/xerogels superinsulators.

    DOI: 10.1021/acs.chemmater.6b01936

    Scopus

  81. The XVIII International Sol-Gel Conference: Sol-Gel 2015 was held in Kyoto, Japan, September 6-11, 2015 Reviewed

    Nakanishi Kazuki

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 79 ( 2 ) page: 241 - 241   2016.8

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s10971-016-4124-y

    Web of Science

  82. Facile preparation of well-defined macroporous yttria-stabilized zirconia monoliths via sol-gel process accompanied by phase separation Reviewed

    Guo, Xingzhong, Song, Jie, Ren, Jing, Yang, Fanger, Kanamori, Kazuyoshi, Nakanishi, Kazuki

    Journal of Porous Materials   Vol. 23 ( 4 ) page: 867 - 875   2016.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER  

    Yttria-stabilized zirconia monoliths with well-defined macropores and high porosity have been successfully fabricated via sol-gel process accompanied by phase separation. Propylene oxide acts as an acid consumer to mediate sol-gel process, and poly (ethylene oxide) is used to induce phase separation. Ethylene glycol is applied as chelating agent, and formamide serves as drying control chemical additive to inhibit cracking during drying stage. Proper proportion of the starting compositions allows the generation of well-defined macroporous YSZ monoliths with co-continuous skeletons and porosity as high as more than 60 %. The dried gels are amorphous and crystalline of ZrO2 precipitates after heat treatment between 400 and 1200 A degrees C without formation of monoclinic ZrO2, which indicating a wide application prospects.

    DOI: 10.1007/s10934-016-0143-x

    Web of Science

    Scopus

  83. Hierarchically Porous Carbon Monoliths Comprising Ordered Mesoporous Nanorod Assemblies for High-Voltage Aqueous Supercapacitors Reviewed

    George Hasegawa, Kazuyoshi Kanamori, Tsutomu Kiyomura, Hiroki Kurata, Takeshi Abe, Kazuki Nakanishi

    CHEMISTRY OF MATERIALS   Vol. 28 ( 11 ) page: 3944 - 3950   2016.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    This report demonstrates a facile one-pot synthesis of hierarchically porous resorcinol-formaldehyde (RF) gels comprising mesoporous nanorod assemblies with two-dimensional (2D) hexagonal ordering by combining a supramolecular self-assembly strategy in the nanometer scale and phase separation in the micrometer scale. The tailored multilevel pore system in the polymer scaffolds can be preserved through carbonization and thermal activation, yielding the multimodal porous carbon and activated carbon (AC) monoliths. The thin columnar macroframeworks are beneficial for electrode materials due to the short mass diffusion length through small pores (micro- and mesopores). By employing the nanostructured AC monolith as a binder-free electrode for supercapacitors, we have also explored the capability of "water-in-salt" electrolytes, aiming at high-voltage aqueous supercapacitors. Despite that the carbon electrode surface is supposed to be covered with salt-derived decomposition products that hinder the water reduction, the effective surface area contributing to electric double-layer capacitance in 5 M bis(trifluoromethane sulfonyl)imide (LiTFSI) is found to be comparable to that in a conventional neutral aqueous electrolyte. The expanded stability potential window of the superconcentrated electrolyte allows for a 2.4 V-class aqueous AC/AC symmetric supercapacitor with good cycle performance.

    DOI: 10.1021/acs.chemmater.6b01261

    Web of Science

    Scopus

    Other Link: http://orcid.org/0000-0002-8069-4780

  84. Boehmite Nanofiber-Polymethylsilsesquioxane Core-Shell Porous Monoliths for a Thermal Insulator under Low Vacuum Conditions Reviewed

    Hayase, Gen, Nonomura, Kazuya, Kanamori, Kazuyoshi, Maeno, Ayaka, Kaji, Hironori, Nakanishi, Kazuki

    Chemistry of Materials   Vol. 28 ( 10 ) page: 3237 - 3240   2016.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    DOI: 10.1021/acs.chemmater.6b01010

    Web of Science

    Scopus

  85. Metal zirconium phosphate macroporous monoliths: Versatile synthesis, thermal expansion and mechanical properties Reviewed

    Yang Zhu, Kazuyoshi Kanamori, Nirmalya Moitra, Kohei Kadono, Shugo Ohi, Norimasa Shimobayashi, Kazuki Nakanishi

    MICROPOROUS AND MESOPOROUS MATERIALS   Vol. 225   page: 122 - 127   2016.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    A versatile synthetic method has been developed for the fabrication of metal zirconium phosphate (MZP) macroporous monoliths via a sol-gel process accompanied by phase separation. More than 30 kinds of MZP monolithic polycrystalline monoliths with co-continuous macroporous structure have been synthesized by simply adding the target metal salt in the starting solution with optimized compositions. Glycerol, due to its high boiling point, plays the key role as the solvent to prevent metal salt from recrystallization, allowing a homogeneous distribution of metal salts over the polymerizing zirconium phosphate network. Hierarchically porous polycrystalline strontium zirconium phosphate (SrZrP) monolith has been obtained when the dried gel was calcined at 1000 degrees C. Very low thermal expansion (coefficient of thermal expansion (CTE) as 1.4 x 10(-6) K-1) over a wide temperature range (38 degrees C-1000 degrees C) together with good mechanical properties (flexural modulus as 8.0 GPa from 3 point bending test and Young's modulus as 1.9 GPa from uniaxial compression test) has been demonstrated, while high porosity (43%) due to the presence of macropores reduces bulk density. As compared with dense ceramics of the same composition, the CTE value is lower and can be attributed to the presence of nanometer-sized small pores, which absorbs the anisotropic thermal expansion of each crystallite in the macropore skeletons at elevated temperatures. (C) 2015 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.micromeso.2015.12.002

    Web of Science

    Scopus

  86. Dynamic spring-back behavior in evaporative drying of polymethylsilsesquioxane monolithic gels for low-density transparent thermal superinsulators Reviewed

    Hayase, Gen, Kanamori, Kazuyoshi, Maeno, Ayaka, Kaji, Hironori, Nakanishi, Kazuki

    Journal of Non-Crystalline Solids   Vol. 434   page: 115 - 119   2016.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Ambient pressure drying of polymethylsilsesquioxane gels via dynamic shrinkage-reexpansion has been investigated for preparation of aerogel-like xerogels and their application to thermal superinsulators. An extended aging of wet gels in aqueous solution containing precursor-derived species is found to be crucial in obtaining crack-free, monolithic xerogels with sufficiently low thermal conductivity (13.7 mW m(-1) K-1) at bulk density of 0.140 g cm(-3) (porosity similar to 90%). (C) 2015 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jnoncrysol.2015.12.016

    Web of Science

    Scopus

  87. Encapsulation of hydrophobic ingredients in hard resin capsules with ultrahigh efficiency using a superoleophobic material Reviewed

    Takei, Takayuki, Terazono, Keita, Araki, Kiyotaka, Ozuno, Yoshihiro, Hayase, Gen, Kanamori, Kazuyoshi, Nakanishi, Kazuki, Yoshida, Masahiro

    Polymer Bulletin   Vol. 73 ( 2 ) page: 409 - 417   2016.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER  

    Spherical capsules have been used in various fields because of their many advantages. In many industrial applications, hydrophobic hard resins (e.g., polyacrylate, epoxy and polystyrene) are used as a shell material for stable packaging of ingredients within capsules. However, it is difficult to encapsulate ingredients in such capsules without loss by conventional techniques. The purpose of this study was to encapsulate hydrophobic ingredients within polyacrylate resin capsules with ultrahigh efficiency. In our methodology, a small volume of resin monomer solution containing the ingredients was first placed on a superoleophobic material and the resulting spherical droplets were then solidified by polymerization of the monomer. Doxorubicin (an anticancer drug), a-tocopherol (an antioxidant) and tetradecane (a phase change material used for heat storage) could be encapsulated in spherical hard capsules with almost no loss by heat and photopolymerization. We showed that tetradecane in the capsules had almost identical thermal properties to pure tetradecane. These results demonstrate that our technique is promising for encapsulation of hydrophobic ingredients in hard resin capsules.

    DOI: 10.1007/s00289-015-1497-y

    Web of Science

    Scopus

  88. The chromatographic performance of flow-through particles: A computational fluid dynamics study Reviewed

    Smits Wim, Nakanishi Kazuki, Desmet Gert

    JOURNAL OF CHROMATOGRAPHY A   Vol. 1429   page: 166 - 174   2016.1

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.chroma.2015.12.019

    Web of Science

    PubMed

  89. Hierarchically porous titanium phosphate monoliths and their crystallization behavior in ethylene glycol Reviewed

    Yang Zhu, Koji Yoneda, Kazuyoshi Kanamori, Kazuyuki Takeda, Tsutomu Kiyomura, Hiroki Kurata, Kazuki Nakanishi

    NEW JOURNAL OF CHEMISTRY   Vol. 40 ( 5 ) page: 4153 - 4159   2016

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    Hierarchically porous titanium phosphate monoliths combining well-defined co-continuous macropores and accessible large mesopores have been synthesized for the first time via a sol-gel process accompanied by phase separation using titanium oxysulfate and phosphoric acid as precursors. The macropore size was tunable over a broad range from 0.6 mu m to 10 mu m by changing the starting composition, while the mesopore size and the specific surface area of the as-synthesized amorphous monoliths are 21 nm and 320 m(2) g (1), respectively. Crystallization of the gel network can be induced in two different ways. Calcination at elevated temperature (800 degrees C) leads to the formation of TiP2O7 and the collapse of both the macro- and meso-structures, while the solvothermal treatment of the as-synthesized gel in ethylene glycol leads to the formation of platy crystals of titanium phosphate with a layered structure at relatively low temperature. The titanium phosphate monoliths with a hierarchically porous structure are expected to be useful in various applications such as continuous-flow catalysis, water remediation and ion batteries.

    DOI: 10.1039/c5nj02820e

    Web of Science

    Scopus

  90. Hard Carbon Anodes for Na-Ion Batteries: Toward a Practical Use Reviewed

    George Hasegawa, Kazuyoshi Kanamori, Naokatsu Kannari, Jun-ichi Ozaki, Kazuki Nakanishi, Takeshi Abe

    CHEMELECTROCHEM   Vol. 2 ( 12 ) page: 1917 - 1920   2015.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-V C H VERLAG GMBH  

    Hard carbons have immense potential as anode materials for Na-ion batteries, because the expanded graphene interlayers and nanovoids between randomly stacked aromatic fragments can accommodate a substantial amount of sodium. However, the large irreversible capacity in the first cycle still remains as a significant issue in terms of a practicable battery technology. Here, we show that hard carbon electrodes derived from a common phenol resin deliver a high reversible capacity within the narrow potential range of 0.1-0.005V (vs. Na+/Na) and an excellent initial coulombic efficiency up to 95%. The former allows the sustainable high voltage, whereas the latter minimizes the amount of unavailable Na+ in a closed cell. The findings in this work put forward a guideline for manufacturing hard carbon electrodes, which goes against the current trend of nanostructuring and downsizing.

    DOI: 10.1002/celc.201500412

    Web of Science

    Scopus

  91. Synthesis of hierarchically porous polymethylsilsesquioxane monoliths with controlled mesopores for HPLC separation Reviewed

    Yang Zhu, Yoshie Morimoto, Taiyo Shimizu, Kei Morisato, Kazuyuki Takeda, Kazuyoshi Kanamori, Kazuki Nakanishi

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   Vol. 123 ( 1441 ) page: 770 - 778   2015.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    Sol-gel synthesis of macroporous polymethylsilsesquioxane (PMSQ) monoliths has been successful over the past decade, and applications to separation media have been investigated. However, the control of mesopores to tailor hierarchical porosity, which is promising for improvement of the separation efficiency, remains challenging. In particular, an independent control of meso- and macropores has not been achieved in PMSQ. Herein we present a method to synthesize PMSQ monoliths with well-defined macropores and controlled mesostructure (pore size ranging from 10 to 60 nm, total pore volume from 0.2 to 0.6 cm(3) g(-1)) via sol-gel accompanied by phase separation. Different Pluronic-type nonionic surfactants were used to control phase separation of the hydrophobic PMSQ network in aqueous media. Due to different packing density of the colloidal PMSQ constituents in the continuous skeletons in the micrometer-scale (termed as macropore skeletons) and their rearrangements through the hydrothermal post-treatment under basic conditions, mesopore characteristics have been successfully controlled independently of the preformed macropore structure. Separation columns for high-performance liquid chromatography (HPLC) have been fabricated using the PMSQ monoliths, and acceptable separation performances in both the reversed-phase and normal-phase modes have been demonstrated due to the presence of both hydrophilic silanol groups and hydrophobic methyl groups. (C) 2015 The Ceramic Society of Japan. All rights reserved.

    DOI: 10.2109/jcersj2.123.770

    Web of Science

  92. Novel soft touch silicone beads from methyltrimethoxysilane and dimethyldimethoxysilane using easy aqueous solution reaction Reviewed

    Reiichiro Tsuchiya, Takumi Tanaka, Gen Hayase, Kazuyoshi Kanamori, Kazuki Nakanishi

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   Vol. 123 ( 1441 ) page: 714 - 718   2015.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    Conventionally, commercialized spherical silicone powders, such as silicone resin powder [INCI: POLYMETHYLSILSESQUIOXANE (PMSQ beads)] 1) and silicone rubber powder [INCI: DIMETHICONE/VINYL DIMETHICONE CROSSPOLYMER (DVDC beads)], 2) have been formulated into cosmetics for soft and smooth feeling. Due to the low crosslink density, silicone rubber powder shows soft touch and high oil absorption. However, it is too agglomerative to be formulated into powder foundation. In this work, we have developed the novel soft touch spherical silicone beads made from methyltrimethoxysilane (MTMS) and dimethyldimethoxysilane (DMDMS), using a surfactant, cetyltrimethylammonium chloride (CTAC). The preparation procedure of the novel silicone beads requires only homogeneous mixing and includes no other complicated operations. The Si-29 NMR and TG measurements indicate that DMDMS is randomly incorporated into the methylsiloxane network. The particle size of the beads can be controlled by the concentration of urea as well as by the stirring speed in the sol-gel reaction. By carefully adjusting these parameters, the size of the beads has been optimized for the use in make-up cosmetics. It was revealed by various evaluation measurements that the novel silicone beads exhibit unique characteristics, such as softness, low oil absorption, high transparency and light diffusion effects. (C) 2015 The Ceramic Society of Japan. All rights reserved.

    DOI: 10.2109/jcersj2.123.714

    Web of Science

    Scopus

  93. High-performance liquid chromatography separation of unsaturated organic compounds by a monolithic silica column embedded with silver nanoparticles Reviewed

    Yang Zhu, Kei Morisato, George Hasegawa, Nirmalya Moitra, Tsutomu Kiyomura, Hiroki Kurata, Kazuyoshi Kanamori, Kazuki Nakanishi

    JOURNAL OF SEPARATION SCIENCE   Vol. 38 ( 16 ) page: 2841 - 2847   2015.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-V C H VERLAG GMBH  

    The optimization of a porous structure to ensure good separation performances is always a significant issue in high-performance liquid chromatography column design. Recently we reported the homogeneous embedment of Ag nanoparticles in periodic mesoporous silica monolith and the application of such Ag nanoparticles embedded silica monolith for the high-performance liquid chromatography separation of polyaromatic hydrocarbons. However, the separation performance remains to be improved and the retention mechanism as compared with the Ag ion high-performance liquid chromatography technique still needs to be clarified. In this research, Ag nanoparticles were introduced into a macro/mesoporous silica monolith with optimized pore parameters for high-performance liquid chromatography separations. Baseline separation of benzene, naphthalene, anthracene, and pyrene was achieved with the theoretical plate number for analyte naphthalene as 36 000 m(-1). Its separation function was further extended to cis/trans isomers of aromatic compounds where cis/trans stilbenes were chosen as a benchmark. Good separation of cis/trans-stilbene with separation factor as 7 and theoretical plate number as 76 000 m(-1) for cis-stilbene was obtained. The trans isomer, however, is retained more strongly, which contradicts the long-established retention rule of Ag ion chromatography. Such behavior of Ag nanoparticles embedded in a silica column can be attributed to the differences in the molecular geometric configuration of cis/trans stilbenes.

    DOI: 10.1002/jssc.201500444

    Web of Science

    Scopus

    PubMed

  94. High-Level Doping of Nitrogen, Phosphorus, and Sulfur into Activated Carbon Monoliths and Their Electrochemical Capacitances Reviewed

    George Hasegawa, Takeru Deguchi, Kazuyoshi Kanamori, Yoji Kobayashi, Hiroshi Kageyama, Takeshi Abe, Kazuki Nakanishi

    CHEMISTRY OF MATERIALS   Vol. 27 ( 13 ) page: 4703 - 4712   2015.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    The present report demonstrates a new technique for doping heteroatoms (nitrogen, phosphorus, and sulfur) into carbon materials via a versatile post-treatment. The heat-treatment of carbon materials with a reagent, which is stable at ambient temperatures and evolves reactive gases on heating, in a vacuum-closed tube allows the introduction of various heteroatom-containing functional groups into a carbon matrix. In addition, the sequential doping reactions give rise to dual- and triple-heteroatom-doped carbons. The pore properties of the precursor carbon materials are preserved through each heteroatom doping process, which indicates that independent tuning of heteroatom doping and nanostructural morphology can be achieved in various carbon materials. The electrochemical investigation on the undoped and doped carbon monolithic electrodes applied to supercapacitors provides insights into the effects of heteroatom doping on electrochemical capacitance.

    DOI: 10.1021/acs.chemmater.5b01349

    Web of Science

    Scopus

  95. Effect of Calcination Conditions on Porous Reduced Titanium Oxides and Oxynitrides via a Preceramic Polymer Route (vol 54, pg 2802, 2015) Reviewed

    Hasegawa George, Sato Tatsuya, Kanamori Kazuyoshi, Sun Cheng-Jun, Ren Yang, Kobayashi Yoji, Kageyama Hiroshi, Abe Takeshi, Nakanishi Kazuki

    INORGANIC CHEMISTRY   Vol. 54 ( 11 ) page: 5614 - 5614   2015.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/acs.inorgchem.5b00810

    Web of Science

    PubMed

  96. Preparation of macroporous zirconia monoliths from ionic precursors via an epoxide-mediated sol-gel process accompanied by phase separation. Reviewed

    Guo X, Song J, Lvlin Y, Nakanishi K, Kanamori K, Yang H

    Science and technology of advanced materials   Vol. 16 ( 2 ) page: 025003   2015.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1088/1468-6996/16/2/025003

    PubMed

  97. Effect of Calcination Conditions on Porous Reduced Titanium Oxides and Oxynitrides via a Preceramic Polymer Route Reviewed

    George Hasegawa, Tatsuya Sato, Kazuyoshi Kanamori, Cheng-Jun Sun, Yang Ren, Yoji Kobayashi, Hiroshi Kageyama, Takeshi Abe, Kazuki Nakanishi

    INORGANIC CHEMISTRY   Vol. 54 ( 6 ) page: 2802 - 2808   2015.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    A preceramic polymer route from Ti-based inorganicorganic hybrid networks provides electroconductive N-doped reduced titanium oxides (Ti(n)O2(n-1)) and titanium oxynitrides (TiOxNy) with a monolithic shape as well as well-defined porous structures. This methodology demonstrates an advantageously lower temperature of the crystal phase transition compared to the reduction of TiO2 by carbon or hydrogen. In this study, the effect of calcination conditions on various features of the products has been explored by adopting three different atmospheric conditions and varying the calcination temperature. The detailed crystallographic and elemental analyses disclose the distinguished difference in the phase transition behavior with respect to the calcination atmosphere. The correlation between the crystallization and nitridation behaviors, porous properties, and electric conductivities in the final products is discussed.

    DOI: 10.1021/ic502972v

    Web of Science

    Scopus

    PubMed

  98. Efficiency of short, small-diameter columns for reversed-phase liquid chromatography under practical operating conditions Reviewed

    Yan Ma, Alexander W. Chassy, Shota Miyazaki, Masanori Motokawa, Kei Morisato, Hideyuki Uzu, Masayoshi Ohira, Masahiro Furuno, Kazuki Nakanishi, Hiroyoshi Minakuchi, Khaled Mriziq, Tivadar Farkas, Oliver Fiehn, Nobuo Tanaka

    JOURNAL OF CHROMATOGRAPHY A   Vol. 1383   page: 47 - 57   2015.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Prototype small-size (1.0 mm I.D., 5 cm long) columns for reversed-phase HPLC were evaluated in relation to instrument requirements. The performance of three types of columns, monolithic silica and particulate silica (2 mu m, totally porous and 2.6 mu m, core-shell particles) was studied in the presence of considerable or minimal extra-column effects, while the detector contribution to band broadening was minimized by employing a small size UV-detector cell (6- or 90 nL). A micro-LC instrument having small system volume (&lt;1 mu L) provided extra-column band variance of only 0.01-0.02 mu L-2. The three columns generated about 8500 theoretical plates for solutes with retention factor, k&gt; 1-3 (depending on the column), in acetonitrile/water mobile phase (65/35 = vol/vol) at 0.05 mL/min, with the instrument specified above. The column efficiency was lower by up to 30% than that observed with a 2.1 mm 1.12 commercial column. The small-size columns also provided 8000-8500 theoretical plates for well retained solutes with a commercial ultrahigh-pressure liquid chromatography (UHPLC) instrument when extra-column contributions were minimized. While a significant extra-column effect was observed for early eluting solutes (k&lt;2-4, depending on column) with methanol/water (20/80 = vol/vol) as weak-wash solvent, the use of methanol/water = 50/50 as wash solvent affected the column efficiency for most analytes. The results suggest that the band compression effect by the weak-wash solvent associated with partial-loop injection may provide a practical means to reducing the extra-column effect for small-size columns, while the use of an instrument with minimum extra-column effect is highly desirable. (C) 2015 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.chroma.2015.01.014

    Web of Science

    Scopus

    PubMed

    Other Link: http://orcid.org/0000-0002-8069-4780

  99. Hierarchically Porous Li4Ti5O12 Anode Materials for Li- and Na-Ion Batteries: Effects of Nanoarchitectural Design and Temperature Dependence of the Rate Capability Reviewed

    George Hasegawa, Kazuyoshi Kanamori, Tsutomu Kiyomura, Hiroki Kurata, Kazuki Nakanishi, Takeshi Abe

    ADVANCED ENERGY MATERIALS   Vol. 5 ( 1 )   2015.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-V C H VERLAG GMBH  

    Integrated design of both porous structure and crystalline morphology is expected to open up the way to a new class of materials. This report dem- onstrates new nanostructured Li4Ti5O12 materials with hierarchically porous structures and ?ower-like morphologies. Electrochemical studies of the electrodes of Li-ion and Na-ion batteries clearly reveal the advantage of nano- architectural design of active materials. In addition, the temperature depend- ence of Na + -insertion/extraction capacity in relation to Li4Ti5O12 electrodes is for the ?rst time evaluated and it is found that elevation of the cell operating temperature effectively improves the rate capability of the Na-ion batteries. Based on the new ?ndings, it is suggested that specially designed Li4Ti5O12 materials allow for high-performance Na-ion batteries that are available as large-scale storage devices for applications such as automotive and stationary energy storage.

    DOI: 10.1002/aenm.201400730

    Web of Science

    Scopus

  100. Direct preparation and conversion of copper hydroxide-based monolithic xerogels with hierarchical pores Reviewed

    Shotaro Fukumoto, Kazuki Nakanishi, Kazuyoshi Kanamori

    NEW JOURNAL OF CHEMISTRY   Vol. 39 ( 9 ) page: 6771 - 6777   2015

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    Copper hydroxide-based monolithic xerogels with controlled hierarchical pores have been prepared directly by a sol-gel process from an ionic precursor, CuCl2 center dot 2H(2)O. Propylene oxide acts as a gelation inducer by increasing pH homogeneously in a reaction solution. Poly(acrylamide) is utilized not only to control macroscopic phase separation but also to support the network physically. Glycerol contributes to the formation of monolithic gels by suppressing the growth of copper hydroxide crystals. An appropriate starting composition leads to co-continuous gel skeletons and macropores. Although the as-dried gels were amorphous, post-treatments (calcination and solvothermal treatment) formed metallic copper and copper oxides (CuO and Cu2O) without the collapse of the monolithic form and macrostructure.

    DOI: 10.1039/c5nj00479a

    Web of Science

    Scopus

  101. Mesoscopic superstructures of flexible porous coordination polymers synthesized via coordination replication Reviewed

    Kenji Sumida, Nirmalya Moitra, Julien Reboul, Shotaro Fukumoto, Kazuki Nakanishi, Kazuyoshi Kanamori, Shuhei Furukawa, Susumu Kitagawa

    CHEMICAL SCIENCE   Vol. 6 ( 10 ) page: 5938 - 5946   2015

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    The coordination replication technique is employed for the direct conversion of a macro- and mesoporous Cu(OH)(2)-polyacrylamide composite to three-dimensional superstructures consisting of the flexible porous coordination polymers, Cu-2(bdc)(2)(MeOH)(2) and Cu-2(bdc)(2)(bpy) (bdc(2-) = 1,4-benzenedicarboxylate, bpy = 4,4'-bipyridine). Detailed characterization of the replicated systems reveals that the structuralization plays an important role in determining the adsorptive properties of the replicated systems, and that the immobilization of the crystals within a higher-order architecture also affects its structural and dynamic properties. The polyacrylamide polymer is also found to be crucial for maintaining the structuralization of the monolithic systems, and in providing the mechanical robustness required for manual handling. In all, the results discussed here demonstrate a significant expansion in the scope of the coordination replication strategy, and further confirms its utility as a highly versatile platform for the preparation of functional three-dimensional superstructures of porous coordination polymers.

    DOI: 10.1039/c5sc02034d

    Web of Science

    Scopus

    PubMed

  102. Mechanically stable, hierarchically porous Cu-3(btc)(2) (HKUST-1) monoliths via direct conversion of copper(II) hydroxide-based monoliths Reviewed

    Nirmalya Moitra, Shotaro Fukumoto, Julien Reboul, Kenji Sumida, Yang Zhu, Kazuki Nakanishi, Shuhei Furukawa, Susumu Kitagawa, Kazuyoshi Kanamori

    CHEMICAL COMMUNICATIONS   Vol. 51 ( 17 ) page: 3511 - 3514   2015

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    The synthesis of highly crystalline macro-meso-microporous monolithic Cu-3(btc)(2) (HKUST-1; btc(3-) = benzene-1,3,5-tricarboxylate) is demonstrated by direct conversion of Cu(OH)(2)-based monoliths while preserving the characteristic macroporous structure. The high mechanical strength of the monoliths is promising for possible applications to continuous flow reactors.

    DOI: 10.1039/c4cc09694k

    Web of Science

    Scopus

    PubMed

  103. Preparation of silver nanoparticles embedded hierarchically porous AlPO4 monoliths Reviewed

    Cai Xiaobo, Zhu Wenjun, Yang Hui, Xu Chenyang, Nakanishi Kazuki, Kanamori Kazuyoshi, Guo Xingzhong

    NEW JOURNAL OF CHEMISTRY   Vol. 39 ( 8 ) page: 6238 - 6243   2015

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1039/c5nj00490j

    Web of Science

  104. Spontaneous preparation of hierarchically porous silica monoliths with uniform spherical mesopores confined in a well-defined macroporous framework Reviewed

    Guo Xingzhong, Wang Rui, Yu Huan, Zhu Yang, Nakanishi Kazuki, Kanamori Kazuyoshi, Yang Hui

    DALTON TRANSACTIONS   Vol. 44 ( 30 ) page: 13592 - 13601   2015

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1039/c5dt01672j

    Web of Science

    PubMed

  105. Sol-gel synthesis of nanocrystal-constructed hierarchically porous TiO2 based composites for lithium ion batteries Reviewed

    Zhu Wenjun, Yang Hui, Nakanishi Kazuki, Kanamori Kazuyoshi, Guo Xingzhong

    RSC ADVANCES   Vol. 5 ( 31 ) page: 24803 - 24813   2015

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1039/c5ra03491d

    Web of Science

  106. Impact of Electrolyte on Pseudocapacitance and Stability of Porous Titanium Nitride (TiN) Monolithic Electrode Reviewed

    George Hasegawa, Atsushi Kitada, Shota Kawasaki, Kazuyoshi Kanamori, Kazuki Nakanishi, Yoji Kobayashi, Hiroshi Kageyama, Takeshi Abe

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   Vol. 162 ( 1 ) page: A77 - A85   2015

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELECTROCHEMICAL SOC INC  

    We report the fabrication of porous titanium nitride (TiN) monoliths through the ammonolysis of porous TiO2 monoliths prepared via the sol-gel process accompanied by phase separation. The obtained TiN monoliths possess good mechanical strength as well as excellent electric conductivity with a superconducting transition at T-c similar to 5.0 K. We have investigated the electrochemical properties of the porous TiN monoliths as an electrode using various electrolytes. The results reveal that the pseudocapacitance of TiN increases in the order of K+ &lt; Na+ &lt; Li+ contrary to the case of EDL capacitance in neutral aqueous electrolytes. It is also found that acidic and strongly basic electrolytes are not suitable due to high corrosivity, while there is no significant deterioration when neutral aqueous electrolytes and organic electrolytes are used. (C) 2014 The Electrochemical Society. All rights reserved.

    DOI: 10.1149/2.0491501jes

    Web of Science

    Scopus

  107. Fabrication of hierarchically porous monolithic layered double hydroxide composites with tunable microcages for effective oxyanion adsorption Reviewed

    Naoki Tarutani, Yasuaki Tokudome, Megu Fukui, Kazuki Nakanishi, Masahide Takahashi

    RSC ADVANCES   Vol. 5 ( 70 ) page: 57187 - 57192   2015

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    Removal of toxic substances from industrial wastes is an urgent issue for realizing a sustainable society. Layered double hydroxides ( LDHs) are expected to be an effective adsorbent for toxic anions, especially oxyanions, because of their high anion adsorption capacity and reusability. Monolithic LDH materials with rational meso- and macropores are expected to show high adsorption capacity/rate towards targeted toxic substances owing to their large specific surface area and liquid transport property. Besides fabricating hierarchical pores, size control of microcages in LDH crystals is required to achieve selective removal of oxyanions. Herein, we prepared hierarchically porous monolithic LDH composites with tunable microcages by changing the combination of cationic species in the LDH crystal. Monolithic Mg-, Mn-, Fe-, Co- and Ni-Al type LDH composites with hierarchical pores were successfully prepared via an epoxide-mediated sol-gel reaction accompanied with phase separation. The monolithic Co-Al type LDH composite with hierarchical pores exhibited the highest CrO42- adsorption capacity because its microcage size easily fits the CrO42- size. Also Co-Al type LDH composites adsorbed different oxyanions, depending on their affinity with the LDH, in a SO42-, CrO42-, MoO42- and HVO42- co-existing solution. The pore size controllability in discrete length-scales of micrometers, nanometers, and picometers offers LDHs with tailored surface chemistries and physical properties desirable for effective and selective oxyanion adsorption.

    DOI: 10.1039/c5ra05942a

    Web of Science

    Scopus

  108. Facile synthesis of monolithic mayenite with well-defined macropores via an epoxide-mediated sol-gel process accompanied by phase separation Reviewed

    Xingzhong Guo, Xiaobo Cai, Jie Song, Yang Zhu, Kazuki Nakanishi, Kazuyoshi Kanamori, Hui Yang

    NEW JOURNAL OF CHEMISTRY   Vol. 38 ( 12 ) page: 5832 - 5839   2014.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    Monolithic mayenite with well-defined macropores has been successfully synthesized from ionic precursors via a sol-gel process accompanied by phase separation. The addition of propylene oxide (PO) to the starting solution leads to homogenous gelation and modifies the gel skeleton, whereas the addition of poly(ethylene oxide) (PEO) induces phase separation. Glycol acts as a chelating agent to suppress the precipitation of Ca2+ ions, and formamide works as a drying control chemical additive to enhance the drying behavior. Appropriate amounts of solvents, PEO, and PO allow the formation of calcium aluminate gets with co-continuous macroporous structure. The reaction mechanism of the sol-gel process of the Ca-Al-O system is also investigated by TG-DSC, FT-IR and NMR. The dried gels are amorphous and the crystalline phase Ca12Al14O32Cl2 forms after heat-treatment at 1000 degrees C in air, while the macroporous structure is preserved. The resultant monoliths before and after heat-treatment possess both high porosity and smooth and dense skeletons.

    DOI: 10.1039/c4nj00898g

    Web of Science

    Scopus

    Other Link: http://orcid.org/0000-0002-8069-4780

  109. Facile preparation of silver nanoparticles homogeneously immobilized in hierarchically monolithic silica using ethylene glycol as reductant Reviewed

    Huan Yu, Yang Zhu, Hui Yang, Kazuki Nakanishi, Kazuyoshi Kanamori, Xingzhong Guo

    DALTON TRANSACTIONS   Vol. 43 ( 33 ) page: 12648 - 12656   2014.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    A facile and "green" method was proposed to introduce Ag nanoparticles (Ag NPs) into the hierarchically monolithic silica uniformly in the presence of (3-aminopropyl)-triethoxysilane (APTES) and ethylene glycol. APTES is used to modify the monolith by incorporating amino groups onto the surface of meso-macroporous skeletons, while ethylene glycol is employed as the productive reductant. Ag NPs are homogeneously immobilized in hierarchically monolithic silica after reduction and drying at 40 degrees C for different duration times, and the embedded amount of Ag NPs can reach 15.44 wt% when treated once. The embedment of Ag NPs increases with the repeat treatment and the APTES amount, without uncontrollable crystalline growth. The surface areas of Ag NPs embedded in silica monoliths after heat treatment at 300 and 400 degrees C are higher than those before heat treatment. The modification via APTES and the embedment of Ag NPs does not spoil the morphology of monolithic silica, while changing the pore structures of the monolith. A tentative formation process and a reduction mechanism are proposed for the modification, reduction and embedment. Ag NPs embedded in monolithic silica is promising for wide applications such as catalysis and separation.

    DOI: 10.1039/C4DT00655K

    Web of Science

    Scopus

    PubMed

  110. Surface functionalization of silica by Si-H activation of hydrosilanes. Reviewed

    Moitra N, Ichii S, Kamei T, Kanamori K, Zhu Y, Takeda K, Nakanishi K, Shimada T

    Journal of the American Chemical Society   Vol. 136 ( 33 ) page: 11570 - 3   2014.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/ja504115d

    PubMed

  111. Experimental and numerical validation of the effective medium theory for the B-term band broadening in 1st and 2nd generation monolithic silica columns Reviewed

    Sander Deridder, Alison Vanmessen, Kazuki Nakanishi, Gert Desmet, Deirdre Cabooter

    JOURNAL OF CHROMATOGRAPHY A   Vol. 1351   page: 46 - 55   2014.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Effective medium theory (EMT) expressions for the B-term band broadening in monolithic silica columns are presented at the whole-column as well as at the mesoporous skeleton level. Given the bi-continuous nature of the monolithic medium, regular as well as inverse formulations of the EMT-expressions have been established. The established expressions were validated by applying them to a set of experimental effective diffusion (D-eff)-data obtained via peak parking on a number of 1st and 2nd generation monolithic silica columns, as well as to a set of numerical diffusion simulations in a simplified monolithic column representation (tetrahedral skeleton model) with different external porosities and internal diffusion coefficients. The numerically simulated diffusion data can be very closely represented over a very broad range of zone retention factors (up to k '' = 80) using the established EMT-expressions, especially when using the inverse variant. The expressions also allow representing the experimentally measured effective diffusion data very closely. The measured D-eff/D-mol-values were found to decrease significantly with increasing retention factor, in general going from about D-eff/D-mol = 0.55 to 0.65 at low k '' (k '' congruent to 1.5-3.8) to D-eff/D-mol = 0.25 at very high k '' (k '' congruent to 40-80). These values are significantly larger than observed in fully-porous and core-shell particles. The intra-skeleton diffusion coefficient (D-pz) was typically found to be of the order of D-pz/D-mol = 0.4, compared to D-pz/D-mol = 0.2-0.35 observed in most particle-based columns. These higher D-pz/D-mol values are the cause of the higher D-eff/D-mol values observed. In addition, it also appears that the higher internal diffusion is linked to the higher porosity of the mesoporous skeleton that has a relatively open structure with relatively wide pores. The observed (weak) relation between D-pz/D-mol and the zone retention factor appears to be in good agreement with that predicted when applying the regular variant of the EMT-expression directly to the mesoporous skeleton level. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.chroma.2014.04.099

    Web of Science

    Scopus

    PubMed

    Other Link: http://orcid.org/0000-0002-8069-4780

  112. Polymethylsilsesquioxane-cellulose nanofiber biocomposite aerogels with high thermal insulation, bendability, and superhydrophobicity. Reviewed

    Hayase G, Kanamori K, Abe K, Yano H, Maeno A, Kaji H, Nakanishi K

    ACS applied materials & interfaces   Vol. 6 ( 12 ) page: 9466 - 71   2014.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/am501822y

    PubMed

  113. Preparation of macroporous cordierite monoliths via the sol-gel process accompanied by phase separation Reviewed

    Guo Xingzhong, Nakanishi Kazuki, Kanamori Kazuyoshi, Zhu Yang, Yang Hui

    JOURNAL OF THE EUROPEAN CERAMIC SOCIETY   Vol. 34 ( 3 ) page: 817 - 823   2014.3

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.jeurceramsoc.2013.08.016

    Web of Science

  114. Fabrication of nitrogen-doped TiO2 monolith with well-defined macroporous and bicrystalline framework and its photocatalytic performance under visible light Reviewed

    Olim Ruzimuradov, Suvankul Nurmanov, Mirabbos Hojamberdiev, Ravi Mohan Prasad, Aleksander Gurlo, Joachim Broetz, Kazuki Nakanishi, Ralf Riedel

    JOURNAL OF THE EUROPEAN CERAMIC SOCIETY   Vol. 34 ( 3 ) page: 809 - 816   2014.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCI LTD  

    In this study, hierarchically porous bicrystalline nitrogen-doped titania (N-doped TiO2) monolithic material was fabricated by a simple two-step approach: (i) preparation of TiO2 porous monolith by a sol-gel process of titanium alkoxide in a mild condition utilizing a chelating agent and mineral salt and (ii) annealing of TiO2 porous monolith obtained under a modest flow of ammonia gas at 700 degrees C for 2 h. The phase composition, crystal structure, morphology, pore structure, and porous properties of the final product were studied by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), mercury porosimetry, and nitrogen physisorption measurement, respectively. The resultant N-doped TiO2 porous monolith possesses a bicrystalline (anatase and rutile) framework with a well-defined macroporosity. The results from X-ray photoelectron spectroscopy (XPS) confirm the formation of O-Ti-N bonds in the N-doped TiO2 porous monolith. The photocatalytic activity of N-doped TiO2 porous monolith was evaluated by the photodegradation of Rhodamine B over the samples under visible light. Nearly 50% of Rhodamine B in aqueous solution was efficiently degraded by N-doped TiO2 porous monolith with the mixed-phase of anatase and ruffle under visible light within 120 mm. (C) 2013 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jeurceramsoc.2013.10.009

    Web of Science

    Scopus

    J-GLOBAL

  115. Controlled polymerization of protic ionic liquid monomer by ARGET-ATRP and TERP Reviewed

    Nakamura Y., Nakanishi K., Yamago S., Tsujii Y., Takahashi K., Morinaga T., Sato T.

    Macromolecular Rapid Communications   Vol. 35 ( 6 ) page: 642 - 648   2014.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Macromolecular Rapid Communications  

    The direct synthesis of structurally well-defined protic polymeric ionic liquid (PIL) with controlled molecular weight and molecular weight distribution is examined using N,N-diethyl-N-(2-methacryloylethyl) ammonium bis(tri-fluoromethylsulfonyl)imide (DEMH-TFSI) as a monomer. Three polymerization methods, namely, atom transfer radical polymerization (ATRP), activators regenerated by electron transfer (ARGET)-ATRP, and organotellurium-mediated living radical polymerization (TERP) are employed in this study. While the polymerization by ATRP is slow and does not reach high monomer conversion that under ARGET-ATRP and TERP proceeds smoothly and affords structurally well-defined poly(DEMH-TFSI)s. TERP is especially efficient for the control and poly(DEMH-TFSI)s with low to high molecular weights (M̄n = 49 100-392 500) and narrow molecular weight distributions (M̄w/M̄n = 1.17-1.46) are obtained. These results represent the first example of synthesis of a structurally well-defined protic, ammonium PIL by direct polymerization of the protic ionic liquid monomer. The polymerization of N,N-diethyl-N-(2- methacryloylethyl)-N-methylammonium bis(trifluoromethylsulfonyl)imide (DEMM-TFSI), which possesses a quaternary ammonium salt, also proceeds in a highly controlled manner under TERP conditions. A diblock copolymer, polystyrene-block-poly(DEMH-TFSI), is also successfully synthesized by TERP. Structurally well-defined protic polymeric ionic liquid is prepared by the direct polymerization of protic ammonium-salt ionic liquid monomers, N,N-diethyl-N-(2-methacryloylethyl) ammonium bis(tri-fluoromethylsulfonyl)imide (DEMH-TFSI), under ARGET-ATRP and TERP conditions. TERP is especially suitable for the controlled polymerization and afforded poly(DEMH-TFSI) with low to high molecular weight (M̄n = 49 100-392 500) and a narrow molecular weight distribution (M̄w/M̄n = 1.17-1.46). © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

    DOI: 10.1002/marc.201300855

    Scopus

    PubMed

  116. Detailed characterization of the kinetic performance of first and second generation silica monolithic columns for reversed-phase chromatography separations Reviewed

    Deirdre Cabooter, Ken Broeckhoven, Roman Sterken, Alison Vanmessen, Isabelle Vandendael, Kazuki Nakanishi, Sander Deridder, Gert Desmet

    JOURNAL OF CHROMATOGRAPHY A   Vol. 1325   page: 72 - 82   2014.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    The kinetic performance of commercially available first generation and prototype second generation silica monoliths has been investigated for 2.0 mm and 3.0-3.2 mm inner diameter columns. It is demonstrated that the altered sol-gel process employed for the production of second generation monoliths results in structures with a smaller characteristic size leading to an improved peak shape and higher efficiencies. The permeability of the columns however, decreases significantly due to the smaller throughpore and skeleton sizes. Scanning electron microscopy pictures suggest the first generation monoliths have cylindrical skeleton branches, whereas the second generation monoliths rather have skeleton branches that resemble a single chain of spherical globules. Using recently established correlations for the flow resistance of cylindrical and globule chain type monolithic structures, it is demonstrated that the higher flow resistance of the second generation monoliths can be entirely attributed to their smaller skeleton sizes, which is also evident from the external porosity that is largely the same for both monolith generations (epsilon(e) similar to 0.65). The recorded van Deemter plots show a clear improvement in efficiency for the second generation monoliths (minimal plate heights of 13.6-14.1 mu m for the first and 6.5-8.2 mu m for the second generation, when assessing the plate count using the Foley-Dorsey method). The corresponding kinetic plots, however, indicate that the much reduced permeability of the second generation monoliths results in kinetic performances (time needed to achieve a given efficiency) which are only better than those of the first generation for plate counts up to N similar to 45,000. For more complex samples (N &gt;= 50,000), the first generation monoliths can intrinsically still provide faster analysis due to their high permeability. It is also demonstrated that - despite the improved efficiency of the second generation monoliths in the practical range of separations (N = 10,000-50,000) - these columns can still not compete with state-of-the-art core-shell particle columns when all columns are evaluated at their own maximum operating pressure (200 bar for the monolithic columns, 600 bar for core-shell columns). It is suggested that monolithic columns will only become competitive with these high efficiency particle columns when further improvements to their production process are made and their pressure resistance is raised. (C) 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.chroma.2013.11.047

    Web of Science

    Scopus

    PubMed

    Other Link: http://orcid.org/0000-0002-8069-4780

  117. The thermal conductivity of polymethylsilsesquioxane aerogels and xerogels with varied pore sizes for practical application as thermal superinsulators Reviewed

    G. Hayase, K. Kugimiya, M. Ogawa, Y. Kodera, K. Kanamori, K. Nakanishi

    JOURNAL OF MATERIALS CHEMISTRY A   Vol. 2 ( 18 ) page: 6525 - 6531   2014

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    High-performance thermal insulating materials are desired especially from the viewpoint of saving energy for a sustainable society. Aerogel is the long-awaited material for extended applications due to its excellent thermal insulating ability. These materials are, however, seriously fragile against even small mechanical stress due to their low density, and their poor mechanical properties inhibit their practical use as superinsulators. In this paper, we report relationships between the thermal conductivity, pore size and mechanical properties of organic-inorganic hybrid polymethylsilsesquioxane (PMSQ) aerogels with improved mechanical properties and controllable pore sizes from similar to 50 nm to 3 mu m. The dependency of thermal conductivity on gas pressure and pore properties can be well explained by the thermal conduction theory of porous materials. These PMSQ aerogels show improved mechanical properties due to their elastic networks, which enable easier handling compared to conventional aerogels and facile production by simple ambient pressure drying. An aerogel-like "xerogel" monolithic panel has been successfully prepared via ambient pressure drying, which shows a low thermal conductivity (0.015 W m(-1) K-1) comparable with those of the corresponding PMSQ aerogel and conventional silica aerogels. These results would open the gate for practical applications of these porous materials.

    DOI: 10.1039/c3ta15094a

    Web of Science

  118. Layered double hydroxide composite monoliths with three-dimensional hierarchical channels: structural control and adsorption behavior Reviewed

    Naoki Tarutani, Yasuaki Tokudome, Kazuki Nakanishi, Masahide Takahashi

    RSC ADVANCES   Vol. 4 ( 31 ) page: 16075 - 16080   2014

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    Hierarchically porous layered double hydroxide (LDH) materials have potential in anion-exchange, adsorption and catalysis applications, because of their large surface areas and liquid transportation capabilities. The preparation of monolithic LDH-Al(OH)(3) composites with hierarchical mm and nm-scale channels and their adsorption behavior is reported. Monolithic gels were synthesized via sol-gel processing, from metal salt precursor solutions. mu m-scale macrochannels spontaneously formed by inducing phase separation during sol-gel transition. nm-scale mesochannels were accommodated as interstices between primary/secondary particles. In this study, these hierarchical channel sizes were controlled. The macrochannel size was controlled by tuning the degree of phase separation. The mesochannel size was controlled independently, by tuning the crystallite size of LDH under different solvothermal conditions. The relationship between pore characteristics and adsorption behavior of tailored hierarchically porous LDH-Al(OH)(3) monolithic gels were investigated by using dye molecules as adsorbates. Monolithic gels with larger macrochannels and mesochannels exhibit faster adsorption rate and higher affinity, respectively. LDH-Al(OH)(3) monolithic gels with hierarchical channels may have potential in some applications such as biosensing, water purification and catalysis.

    DOI: 10.1039/c4ra00873a

    Web of Science

    Scopus

    Other Link: http://orcid.org/0000-0002-8069-4780

  119. A new hierarchically porous Pd@HSQ monolithic catalyst for Mizoroki-Heck cross-coupling reactions Reviewed

    Nirmalya Moitra, Ayumi Matsushima, Toshiyuki Kamei, Kazuyoshi Kanamori, Yumi H. Ikuhara, Xiang Gao, Kazuyuki Takeda, Yang Zhu, Kazuki Nakanishi, Toyoshi Shimada

    NEW JOURNAL OF CHEMISTRY   Vol. 38 ( 3 ) page: 1144 - 1149   2014

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    Pore architecture of catalyst supports is an important factor facilitating accessibility of reactants to catalytic sites. This holds the key to improving catalytic activities. Amongst various catalytic reactions, supported Pd nanoparticles-catalyzed C-C cross-coupling reactions have been attracting a great deal of attention in the last decade. Although various supports have been examined, applications of hierarchically porous monolithic materials have never been reported, mainly because of difficulties in multistep synthesis of catalysts. We herein report a novel on-site reduction-based methodology using hierarchically porous hydrogen silsesquioxane (HSQ) monoliths for one-step synthesis of Pd nanoparticles-embedded monoliths (Pd@HSQ). Characterization of these monoliths evidences the on-site reduction, i.e. formation of Pd nanoparticles and conversion of Si-H present in the monolith to Si-OB similar to. Fast, quantitative reduction of Pd2+ to Pd(0) to form supported Pd nanoparticles is achieved with preservation of the porous structure of the original monolith, which makes this material attractive as a catalyst for C-C cross-coupling reactions. The obtained Pd@HSQ catalyst has been employed in the Mizoroki-Heck cross-coupling reaction. High accessibility of reactant molecules, undetectable leaching of Pd nanoparticles and easy separation of the monolith from liquid media provide high catalytic activity, reusability and easy handling.

    DOI: 10.1039/c3nj01433a

    Web of Science

    Scopus

  120. Pore structure control of macroporous methylsilsesquioxane monoliths prepared by in situ two-step processing Reviewed

    Guo Xingzhong, Yu Huan, Yang Hui, Kanamori Kazuyoshi, Zhu Yang, Nakanishi Kazuki

    JOURNAL OF POROUS MATERIALS   Vol. 20 ( 6 ) page: 1477 - 1483   2013.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s10934-013-9733-z

    Web of Science

  121. A Superamphiphobic Macroporous Silicone Monolith with Marshmallow-like Flexibility Reviewed

    Gen Hayase, Kazuyoshi Kanamori, George Hasegawa, Ayaka Maeno, Hironori Kaji, Kazuki Nakanishi

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   Vol. 52 ( 41 ) page: 10788 - 10791   2013.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-V C H VERLAG GMBH  

    DOI: 10.1002/anie.201304169

    Web of Science

    Scopus

    PubMed

    J-GLOBAL

  122. Recyclable functionalization of silica with alcohols via dehydrogenative addition on hydrogen silsesquioxane. Reviewed

    Moitra N, Kamei T, Kanamori K, Nakanishi K, Takeda K, Shimada T

    Langmuir : the ACS journal of surfaces and colloids   Vol. 29 ( 39 ) page: 12243 - 53   2013.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/la402205j

    PubMed

  123. Hierarchically porous monoliths based on N-doped reduced titanium oxides and their electric and electrochemical properties Reviewed

    George Hasegawa, Tatsuya Sato, Kazuyoshi Kanamori, Kousuke Nakano, Takeshi Yajima, Yoji Kobayashi, Hiroshi Kageyama, Takeshi Abe, Kazuki Nakanishi

    Chemistry of Materials   Vol. 25 ( 17 ) page: 3504 - 3512   2013.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    In this report, we demonstrate a novel synthesis method to obtain reduced titanium oxides with monolithic shape and with a well-defined hierarchically porous structure from the titanium-based network bridged with ethylenediamine. The hierarchically porous monoliths are fabricated by the nonhydrolytic sol-gel reaction accompanied by phase separation. This method allows a low-temperature crystallization into Ti4O7 and Ti3O5 at 800 and 900 C, respectively, with N-doped carbon. These reduced titanium oxides are well-doped with N atoms even under argon atmosphere without NH 3, which accounts for the low-temperature reduction. The resultant monolithic materials possess controllable macropores and high specific surface area together with excellent electric conductivity up to 230 S cm-1, indicating promise as a conductive substrate that can substitute carbon electrodes. © 2013 American Chemical Society.

    DOI: 10.1021/cm401933a

    Web of Science

    Scopus

    J-GLOBAL

  124. Preparation of mullite monoliths with well-defined macropores and mesostructured skeletons via the sol-gel process accompanied by phase separation Reviewed

    Guo Xingzhong, Li Wenyan, Nakanishi Kazuki, Kanamori Kazuyoshi, Zhu Yang, Yang Hui

    JOURNAL OF THE EUROPEAN CERAMIC SOCIETY   Vol. 33 ( 10 ) page: 1967 - 1974   2013.9

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.jeurceramsoc.2013.02.018

    Web of Science

  125. Sol-gel synthesis of macroporous TiO2 from ionic precursors via phase separation route Reviewed

    Li Wenyan, Guo Xingzhong, Zhu Yang, Hui Yang, Kanamori Kazuyoshi, Nakanishi Kazuki

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 67 ( 3 ) page: 639 - 645   2013.9

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s10971-013-3123-5

    Web of Science

  126. Gelation behavior and phase separation of macroporous methylsilsesquioxane monoliths prepared by in situ two-step processing Reviewed

    Xingzhong Guo, Wenyan Li, Hui Yang, Kazuyoshi Kanamori, Yang Zhu, Kazuki Nakanishi

    Journal of Sol-Gel Science and Technology   Vol. 67 ( 2 ) page: 406 - 413   2013.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    An in situ two-step processing using an initial acid catalysis step accompanied by an epoxide-mediated condensation step in the presence of ammonium chloride (NH4Cl) is reported, and macroporous cocontinuous methylsilsesquioxane (MSQ) monoliths have been successfully prepared by this processing. We explain the hydrolysis, gelation behavior and phase separation of MTMS(methyltrimethoxysilane)-MeOH(methanol)-HCl-PO(propylene oxide) system and the in situ effect of NH4Cl, and examine the macroporous morphology and pore structures of MSQ monoliths obtained under different conditions. Macroporous MSQ monolith under optimized conditions possesses a narrow macropore size distribution between 3 to 10 μm, surface area as high as 366 m 2·g-1 and minimal shrinkage of only 1 %. © 2013 Springer Science+Business Media New York.

    DOI: 10.1007/s10971-013-3094-6

    Web of Science

    Scopus

    J-GLOBAL

  127. Hierarchically porous nickel/carbon composite monoliths prepared by sol-gel method from an ionic precursor Reviewed

    Yasuki Kido, Kazuki Nakanishi, Nao Okumura, Kazuyoshi Kanamori

    MICROPOROUS AND MESOPOROUS MATERIALS   Vol. 176   page: 64 - 70   2013.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Utilizing a facile sol-gel reaction accompanied by phase separation, rigid monolithic nickel hydroxide-based xerogels and nickel/carbon composites with hierarchical porosity have been successfully fabricated. In the synthetic route starting from nickel chloride as a nickel precursor, trimethylene oxide acts as a gelation initiator to increase pH in a reaction solution. In addition, poly(acrylic acid) plays a double role as a phase separation inducer and as a co-constituent with nickel hydroxide to comprise continuous gel skeletons in the micrometer range. As a result, obtained xerogels possess well-defined macropores evidenced by microscopy observation and mercury porosimetry. Subsequent heat-treatment in air led to the crystallization of NiO at 300 degrees C, while calcination under argon flow brought about the formation of nickel/carbon (Ni/C) composites with hierarchical pores and large specific surface area at temperatures higher than 300 degrees C. This is the first report on the preparation of rigid monolithic xerogels and metal/carbon composite with well-defined macropores based on a metal salt precursor containing "divalent" cation. (c) 2013 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.micromeso.2013.03.042

    Web of Science

    Scopus

    J-GLOBAL

  128. Preparation of a hierarchically porous AlPO<sub>4</sub> monolith via an epoxide-mediated sol-gel process accompanied by phase separation. Reviewed

    Li W, Zhu Y, Guo X, Nakanishi K, Kanamori K, Yang H

    Science and technology of advanced materials   Vol. 14 ( 4 ) page: 045007   2013.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1088/1468-6996/14/4/045007

    PubMed

  129. Fabrication of large-sized silica monolith exceeding 1000 mL with high structural homogeneity Reviewed

    Riichi Miyamoto, Yukiko Ando, Chie Kurusu, Hong-zhi Bai, Kazuki Nakanishi, Masamichi Ippommatsu

    JOURNAL OF SEPARATION SCIENCE   Vol. 36 ( 12 ) page: 1890 - 1896   2013.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-V C H VERLAG GMBH  

    Reproducible fabrication of the hierarchically porous monolithic silica in a large volume exceeding 1000 mL has been established. By the hydrothermal enlargement of the fully accessible small pores to exceed 50 nm in diameter, the capillary force emerged on solvent evaporation was dramatically reduced, which allowed the preparation of crack-free monoliths with evaporative solvent removal under an ambient pressure. The local temperature inhomogeneity within a reaction vessel in a large volume was precisely controlled to cancel the heat evolved by the hydrolysis reaction of tetramethoxysilane and that consumed to melt ice cubes dispersed in the solution, resulting in large monolithic silica pieces with improved structural homogeneity. Homogeneity of the pore structure was confirmed, both on macro- and mesoscales, using SEM, mercury intrusion, and nitrogen adsorption/desorption measurements. Furthermore, the deviations in chromatographic performance were examined by evaluating multiple smaller monolithic columns prepared from the monolithic silica pieces cut from different parts of a large monolith. All the daughter columns thus prepared exhibited comparable performances to each other to prove the overall homogeneity of the mother monolith. Preliminary results on high-speed separation of peptides and proteins by the octadecylsilylated silica monolith of the above production have also been demonstrated.

    DOI: 10.1002/jssc.201300123

    Web of Science

    Scopus

    PubMed

    J-GLOBAL

  130. Synthesis of Silver Nanoparticles Confined in Hierarchically Porous Monolithic Silica: A New Function in Aromatic Hydrocarbon Separations Reviewed

    Zhu Yang, Morisato Kei, Li Wenyan, Kanamori Kazuyoshi, Nakanishi Kazuki

    ACS APPLIED MATERIALS & INTERFACES   Vol. 5 ( 6 ) page: 2118 - 2125   2013.3

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/am303163s

    Web of Science

    PubMed

  131. Macroporous SiO2 monoliths prepared via sol-gel process accompanied by phase separation Reviewed

    Xing-Zhong Guo, Wen-Yan Li, Yang Zhu, Kazuki Nakanishi, Kazuyoshi Kanamori, Hui Yang

    Wuli Huaxue Xuebao/ Acta Physico - Chimica Sinica   Vol. 29 ( 3 ) page: 646 - 652   2013.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Macroporous SiO2 monoliths were prepared via a sol-gel process accompanied by phase separation using a tetramethoxysilane (TMOS) precursor, 0.01 mol·L-1 HCl catalyst, propylene oxide (PO) gelation agent, and poly(ethylene oxide) (PEO, viscosity-averaged molecular weight (Mv): 10000) phase separation inducer. Monoliths were characterized by differential thermal analysis/thermogravimetry (DTA/ TG), Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), mercury porosimetry, and nitrogen adsorption/desorption analysis (BET). The mechanism of the epoxide-mediated sol-gel reaction and PEO induced phase separation was discussed. The addition of PEO induced phase separation, and monolithic SiO2 with a cocontinuous macroporous skeletal structure was obtained at PEO/TMOS molar ratio of 0.0018. Monoliths had a narrow pore size distribution of 1-3 μm, surface area as high as 719 m2·g-1 and pore volume of 0.48 m3·g-1. This sol-gel transition is mediated by PO because of its strong nucleophilic properties and irreversible ring-opening reaction. Simultaneous phase separation is induced by PEO adsorbed on the SiO2 oligomers. © Editorial office of Acta Physico-Chimica Sinica.

    DOI: 10.3866/PKU.WHXB201212252

    Web of Science

    Scopus

    J-GLOBAL

  132. Facile Synthesis of Marshmallow-like Macroporous Gels Usable under Harsh Conditions for the Separation of Oil and Water Reviewed

    Gen Hayase, Kazuyoshi Kanamori, Masashi Fukuchi, Hironori Kaji, Kazuki Nakanishi

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   Vol. 52 ( 7 ) page: 1986 - 1989   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-V C H VERLAG GMBH  

    DOI: 10.1002/anie.201207969

    Web of Science

    Scopus

    PubMed

    J-GLOBAL

  133. New Li2FeSiO4-carbon monoliths with controlled macropores: effects of pore properties on electrode performance Reviewed

    George Hasegawa, Mai Sannohe, Yuya Ishihara, Kazuyoshi Kanamori, Kazuki Nakanishi, Takeshi Abe

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   Vol. 15 ( 22 ) page: 8736 - 8743   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    Monolithic Li2FeSiO4-carbon composites with well-defined macropores have been prepared from the silica-based gels containing Li, Fe, and carbon sources. The macroporous precursor gels can be fabricated by the sol-gel method accompanied by phase separation. A fine control of the macropore size in the resultant composites has been achieved by controlling the macropore size of the precursor gels simply by adjusting the starting compositions. The effects of pore properties on Li insertion-extraction capabilities have been investigated by utilizing the resultant Li2FeSiO4-carbon composites as the cathode of lithium ion batteries. The electrodes prepared from the Li2FeSiO4-carbon composites with different macropore sizes exhibit significant differences in the charge-discharge properties. The results strongly suggest that the smaller macropore size (equal to the thinner macropore skeletons) and the presence of micro-and mesopores in the macropore skeletons (hierarchically porous structure) are desirable for a better electrode in the case of Li2FeSiO4, which has extremely low ionic and electrical conductivities.

    DOI: 10.1039/c3cp50352f

    Web of Science

    Scopus

    PubMed

    J-GLOBAL

  134. Sol-gel synthesis of zinc ferrite-based xerogel monoliths with well-defined macropores Reviewed

    Kido Yasuki, Nakanishi Kazuki, Kanamori Kazuyoshi

    RSC ADVANCES   Vol. 3 ( 11 ) page: 3661 - 3666   2013

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1039/c3ra22481c

    Web of Science

  135. Erratum: Hierarchically porous monoliths of oxygen-deficient anatase TiO<sub>2-x</sub> with electronic conductivity (RSC Advances (2013) DOI:10.1039/C3RA40545A) Reviewed

    A. Kitada, G. Hasegawa, Y. Kobayashi, K. Miyazaki, T. Abe, K. Kanamori, K. Nakanishi, H. Kageyama

    RSC Advances   Vol. 3 ( 48 ) page: 26475-   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1039/c3ra90142d

  136. Hierarchically Porous Monoliths of Oxygen-deficient Anatase TiO2-x with Electronic Conductivity (vol 3, pg 7205, 2013) Reviewed

    Atsushi Kitada, George Hasegawa, Yoji Kobayashi, Kohei Miyazaki, Takeshi Abe, Kazuyoshi Kanamori, Kazuki Nakanishi, Hiroshi Kageyama

    RSC ADVANCES   Vol. 3 ( 48 ) page: 26475 - 26475   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    DOI: 10.1039/c3ra90142d

    Web of Science

  137. Layered double hydroxide (LDH)-based monolith with interconnected hierarchical channels: enhanced sorption affinity for anionic species Reviewed

    Yasuaki Tokudome, Naoki Tarutani, Kazuki Nakanishi, Masahide Takahashi

    JOURNAL OF MATERIALS CHEMISTRY A   Vol. 1 ( 26 ) page: 7702 - 7708   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    Monolithic layered double hydroxides (LDHs) with interconnected channels have been expected to enhance sorption rate as well as increase accumulation of anions. Although powder molding can form easily-handled LDH compacts, interconnected channel formation therein has not been achieved. Herein, we demonstrate cm-scale monolithic LDH-based composites with interconnected hierarchical channels via a spontaneous sol-gel reaction. The synthesis was performed on Mg-Al hydrotalcite-type LDHs starting from metal chlorides aqueous/ethanolic solution with poly(ethylene oxide) incorporated. Addition of propylene oxide triggers a sol-gel reaction to form monolithic xerogels with a formula of [ Mg0.66Al0.33(OH)(2)Cl-0.33 center dot 2.92H(2)O]center dot 3.1Al(OH)(3). LDH crystals together with aluminum hydroxide crystals homogeneously build up gel skeletons with well-defined hierarchical channels. The interconnected channel in mm range (macrochannel) are formed as a phase-separated structure, whereas the channel in nm range (nanochannel) are as interstices of primary particles. The channel architectures are preserved in the course of rehydration process, affording enhanced sorption affinity for anion species in the process. Both of macro and mesochannels as well as high charge density of the obtained LDHs (Mg/Al = 2.0) contribute to enhanced anion sorption in the monolithic xerogels. The materials obtained here opens up applications of high performance adsorbents and ion-storage free from diffusion limitation.

    DOI: 10.1039/c3ta11110e

    Web of Science

    Scopus

    J-GLOBAL

  138. Hierarchically porous monoliths of oxygen-deficient anatase TiO2-x with electronic conductivity Reviewed

    Atsushi Kitada, George Hasegawa, Yoji Kobayashi, Kohei Miyazaki, Takeshi Abe, Kazuyoshi Kanamori, Kazuki Nakanishi, Hiroshi Kageyama

    RSC ADVANCES   Vol. 3 ( 20 ) page: 7205 - 7208   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    We report an electrically conducting oxygen-deficient anatase TiO2-x monolith with macro/meso/micro trimodal pores, prepared by reducing insulating porous TiO2 monoliths at low temperature. Without adding any conductive materials, the TiO2-x monolith itself was electrically conducting enough for lithium insertion, potentially opening a new avenue for carbon-free electrode materials.

    DOI: 10.1039/c3ra40545a

    Web of Science

    Scopus

  139. New Insights into the Relationship between Micropore Properties, Ionic Sizes, and Electric Double-Layer Capacitance in Monolithic Carbon Electrodes Reviewed

    George Hasegawa, Kazuyoshi Kanamori, Kazuki Nakanishi, Takeshi Abe

    JOURNAL OF PHYSICAL CHEMISTRY C   Vol. 116 ( 50 ) page: 26197 - 26203   2012.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    The effects of the pore properties and the ionic sizes on the electric double-layer capacitances have been investigated by using the monolithic carbon electrodes with different pore properties. The carbon monoliths with high surface areas which possess homogeneous pore properties in the whole monoliths were prepared from the bridged-polysilsesquioxane gels via the nanophase extraction technique. The detailed investigations of the pore properties of the carbon monoliths were conducted by the nitrogen physisorption measurement as well as the mercury porosimetry. The electrochemical property of each monolithic carbon electrode was examined by the cyclic voltammetry in the different aqueous electrolytes in order to investigate the effects of the ionic sizes. These fundamental analyses have provided new insights into the efficient micropore sizes in each electrolyte for the superior electric double-layer capacitors.

    DOI: 10.1021/jp309010p

    Web of Science

    Scopus

    J-GLOBAL

  140. Selective preparation of macroporous monoliths of conductive titanium oxides Ti(n)O(2n-1) (n = 2, 3, 4, 6). Reviewed

    Kitada A, Hasegawa G, Kobayashi Y, Kanamori K, Nakanishi K, Kageyama H

    Journal of the American Chemical Society   Vol. 134 ( 26 ) page: 10894 - 8   2012.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/ja302083n

    PubMed

  141. Synthesis of Monolithic Hierarchically Porous Iron-Based Xerogels from Iron(III) Salts via an Epoxide-Mediated Sol-Gel Process Reviewed

    Kido Yasuki, Nakanishi Kazuki, Miyasaka Akira, Kanamori Kazuyoshi

    CHEMISTRY OF MATERIALS   Vol. 24 ( 11 ) page: 2071 - 2077   2012.6

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/cm300495j

    Web of Science

  142. Facile preparation of macroporous graphitized carbon monoliths from iron-containing resorcinol-formaldehyde gels Reviewed

    George Hasegawa, Kazuyoshi Kanamori, Kazuki Nakanishi

    MATERIALS LETTERS   Vol. 76   page: 1 - 4   2012.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    In this report, we demonstrate the facile preparation of macroporous monolithic materials based on graphitized carbon by utilizing catalytic graphitization at relatively low temperature (1000 degrees C). The precursor polymer, macroporous resorcinol-formaldehyde (RF) xerogel, can be obtained without any surfactants or polymeric additives in water/ethanol mixed solvent via the sol-gel reaction accompanied by phase separation. The use of iron chloride as an acid catalyst for polymerization provides the RF monoliths incorporated with Fe, which catalyzes the graphitization. The effects of the starting composition on the morphologies of the resultant RF gels and the characteristics of the graphitized carbon monoliths have been discussed. (C) 2012 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.matlet.2012.02.069

    Web of Science

    Scopus

    J-GLOBAL

  143. Development of flexible porous materials from organotrialkoxysilanes Reviewed

    Kazuyoshi Kanamori, Gen Hayase, Kazuki Nakanishi

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   Vol. 59 ( 6 ) page: 320 - 325   2012.6

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Organosiloxane (RnSiO(4-n)/2) gels can be prepared from organoalkoxysilanes using the sol-gel process. In general,however, formation of uniform networks from these precursors is strongly inhibited due to cyclization reactions. In addition, phase separation of hydrophobic condensates from polar solvent leads to inhomogeneous gels in these systems. A careful control of the hydrolysis and polycondensation reactions is therefore required to obtain a monolithic gel with desired properties. We have been trying to control the sol-gel reactions as well as phase separation in these systems to obtain unique porous materials particularly from methyltrimethoxysilane(MTMS) and dimethyldimethoxysilane (DMDMS). Flexible aerogels and xerogels based on the methylsiloxane networks are discussed.

    DOI: 10.2497/jjspm.59.320

    Scopus

  144. Flower-like surface modification of titania materials by lithium hydroxide solution Reviewed

    George Hasegawa, Kazuyoshi Kanamori, Yoshihiro Sugawara, Yuichi Ikuhara, Kazuki Nakanishi

    JOURNAL OF COLLOID AND INTERFACE SCIENCE   Vol. 374 ( 1 ) page: 291 - 296   2012.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ACADEMIC PRESS INC ELSEVIER SCIENCE  

    Surface modification of titania materials to give flower-like structures has been achieved simply by the treatment in lithium hydroxide aqueous solution under mild conditions. The flower-like structured materials were characterized by X-ray diffraction, thermogravimetric analysis, and Raman scattering. The analyses indicate that the flower-like materials are composed of layered hydrous lithium titanate. It is suggested that the unique intercalation behavior of lithium ions into titania allows dissolution and re-precipitation of titania to form the flower-like structure. The obtained flower-like structure can be retained up to 700 degrees C, while the crystal phase transforms into Li4Ti5O12. (C) 2012 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.jcis.2012.02.002

    Web of Science

    Scopus

    PubMed

    J-GLOBAL

  145. New Monolithic Capillary Columns with Well-Defined Macropores Based on Poly(styrene-co-divinylbenzene) Reviewed

    George Hasegawa, Kazuyoshi Kanamori, Norio Ishizuka, Kazuki Nakanishi

    ACS APPLIED MATERIALS & INTERFACES   Vol. 4 ( 5 ) page: 2343 - 2347   2012.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    Macroporous polymer monoliths based on poly(styrene-co-divinylbenzene) with varied styrene/divinylbenzene ratios have been prepared by organotellurium-mediated living radical polymerization. The well-defined cocontinuous macroporous structure can be obtained by polymerization-induced spinodal decomposition, and the pore structures are controlled by adjusting the starting composition. The separation efficiency of small molecules (alkylbenzenes) in the obtained monoliths has been evaluated in the capillary format by high-performance liquid chromatography (HPLC) under the isocratic reversed-phase mode. Baseline separations of these molecules with a low pressure drop (similar to 2 MPa) have been achieved because of the well-defined macropores and to the less-heterogeneous cross-linked networks.

    DOI: 10.1021/am300552q

    Web of Science

    Scopus

    PubMed

    J-GLOBAL

  146. New flexible aerogels and xerogels derived from di- and trifunctional organosilanes co-precursors

    Hayase Gen, Kanamori Kazuyoshi, Nakanishi Kazuki

    Preprints of Annual Meeting of The Ceramic Society of Japan<br>Preprints of Fall Meeting of The Ceramic Society of Japan   Vol. 2012 ( 0 ) page: 280-280   2012

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    We report new flexible &ldquo;marshmallow-like&rdquo; aerogels and xerogels with a bendable feature from the di- and trifunctional organosilane co-precursor systems. A 2-step acid/base sol–gel process and surfactant are employed to control the phase separation of the hydrophobic networks, which give porous monolithic gels. The obtained gels from methyltrimethoxysilane (MTMS) and dimethyldimethoxysilane (DMDMS) become softer and more flexible with increasing DMDMS fractions.

    DOI: 10.14853/pcersj.2012S.0.280.0

  147. 612 Synthesis of Macroporous Layered Double Hydroxide with a Bulk Form for High Performance Ion Exchange Reaction

    TOKUDOME Yasuaki, TARUTANI Naoki, TAKAHASHI Masahide, NAKANISHI Kazuki

      Vol. 61   page: 159-160   2012

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  148. Hierarchically Porous Materials by Phase Separation: Monoliths Reviewed

    Nakanishi Kazuki

    HIERARCHICALLY STRUCTURED POROUS MATERIALS: FROM NANOSCIENCE TO CATALYSIS, SEPARATION, OPTICS, ENERGY, AND LIFE SCIENCE     page: 241 - 267   2012

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  149. Hierarchically Structured Porous Materials: Application to Separation Sciences Reviewed

    Nakanishi Kazuki

    HIERARCHICALLY STRUCTURED POROUS MATERIALS: FROM NANOSCIENCE TO CATALYSIS, SEPARATION, OPTICS, ENERGY, AND LIFE SCIENCE     page: 517 - 529   2012

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  150. Evolution of Mesopores in Monolithic Macroporous Ethylene-Bridged Polysilsesquioxane Gels Incorporated with Nonionic Surfactant Reviewed

    Atsushi Mushiake, Kazuyoshi Kanamori, Kazuki Nakanishi

    INTERNATIONAL JOURNAL OF POLYMER SCIENCE   Vol. 2012   2012

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:HINDAWI PUBLISHING CORPORATION  

    By combining the micellar templating in nanometer scale with the polymerization-induced phase separation in micrometer scale, ethylene-bridged polysilsesquioxane gels with hierarchical macropores and mesopores are prepared. The difference of mesopore structures depending on the method of the solvent removal has been observed by the X-ray diffraction and the nitrogen adsorption-desorption measurements. During the hydrothermal treatment under the basic condition, the reorganization of the polysilsesquioxane gel network occurred differently depending on the alkoxy group contained in the precursors. From Si-29 CP/MAS NMR measurements, it was revealed that the crosslinking density of the hydrothermally treated gels was increased so that the highly ordered mesostructure of the wet gel could be preserved even after the evaporative drying of solvent.

    DOI: 10.1155/2012/460835

    Web of Science

    Scopus

  151. 2011 Donald R. Ulrich Awards Reviewed

    K. Nakanishi

    Journal of Sol-Gel Science and Technology     page: 1 - 2   2012

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s10971-012-2790-y

  152. Selective Preparation of Macroporous Conductive Oxide Ti<SUB><I>n</I></SUB>O<SUB>2<I>n</I>-1</SUB> (<I>n</I> = 2, 3, 4, 6) Monoliths Reviewed

    Kitada Atsushi, Hasegawa George, Kobayashi Yoji, Kanamori Kazuyoshi, Nakanishi Kazuki, Kageyama Hiroshi

    Preprints of Annual Meeting of The Ceramic Society of Japan<br>Preprints of Fall Meeting of The Ceramic Society of Japan   Vol. 2012 ( 0 ) page: 526 - 526   2012

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Ceramic Society of Japan  

    We report selective preparation of macroporous monoliths of conductive titanium oxides Ti<SUB><I>n</I></SUB>O<SUB>2<I>n</I>-1</SUB> (<I>n</I> = 2, 3, 4, 6) as a single phase, by reducing a macroporous TiO<SUB>2</SUB> monolith using zirconium getter. All the reduced monoliths have uniform pore size distribution, retaining that of the precursor TiO<SUB>2</SUB> monoliths. Furthermore, their bulk densities of 1.8 g cm<SUP>-3</SUP> are about half smaller and their porosities of 60% are about three times larger than that of commercial porous Ebonex (shaped conductive Ti<SUB><I>n</I></SUB>O<SUB>2<I>n</I>-1</SUB>). The obtained Ti<SUB><I>n</I></SUB>O<SUB>2<I>n</I>-1</SUB> (<I>n</I> = 2, 3, 4, 6) macroporous monoliths could find their applications as electrodes for many electrochemical reactions.

    DOI: 10.14853/pcersj.2012S.0.526.0

  153. Facile Preparation of Monolithic LiFePO4/Carbon Composites with Well-Defined Macropores for a Lithium-Ion Battery Reviewed

    George Hasegawa, Yuya Ishihara, Kazuyoshi Kanamori, Kohei Miyazaki, Yuki Yamada, Kazuki Nakanishi, Takeshi Abe

    CHEMISTRY OF MATERIALS   Vol. 23 ( 23 ) page: 5208 - 5216   2011.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    A novel and facile method for the preparation of monolithic LiFePO4/carbon composites with well-defined macropores has been developed. The precursor macroporous gels consisting of inorganic networks as well as organic polymers were fabricated by the epoxide-mediated sol-gel method accompanied by phase separation. The inorganic-organic hybrid gels were calcined under an inert atmosphere, resulting in LiFePO4/carbon monoliths. The influence of the starting compositions on the gel morphologies has been investigated, and the constituents of the gel network were discussed. The reaction mechanism of the crystallization of LiFePO4 from green bodies during calcination has also been investigated by thermal analysis, X-ray diffraction, and Raman scattering. In addition, the electrochemical properties of the resultant LiFePO4/carbon composites were examined by the charge-discharge test.

    DOI: 10.1021/cm2021438

    Web of Science

    Scopus

  154. Macroporous carbon monoliths with large surface area for electric double-layer capacitor

    George Hasegawa, Mami Aoki, Kazuyoshi Kanamori, Kazuki Nakanishi, Teiichi Hanada, Kiyoharu Tadanaga

    Materials Research Society Symposium Proceedings   Vol. 1304   page: 38 - 43   2011.12

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    Macro/meso/microporous carbon monoliths doped with sulfur have been prepared from sulfonated polydivinylbenzene networks followed by the activation with CO 2 resulted in the activated carbon monoliths with high surface area of 2400 m 2 g -1. The monolithic electrode of the activated carbon shows remarkably high specific capacitance (175 F g -1 at 5 mV s -1 and 206 F g -1 at 0.5 A g -1). © 2011 Materials Research Society.

    DOI: 10.1557/opl.2011.604

    Scopus

    J-GLOBAL

  155. Organosiloxane transparent aerogels and hierarchically porous monoliths

    Yasunori Kodera, Gen Hayase, Kazuyoshi Kanamori, Kazuki Nakanishi, Teiichi Hanada

    Materials Research Society Symposium Proceedings   Vol. 1306   page: 54 - 59   2011.12

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    A transition of porous structures in monolithic poly(methylsilsesquioxane) (PMSQ, CH 3SiO 1.5) gels from uniform mesopores to hierarchical pore structures consisting of macro- and mesopores, has been investigated using a sol-gel system containing surfactant Pluronic F127. A broad variation of porous morphology is controlled by changing the concentration of F127. Sufficient concentrations of F127 inhibit the occurrence of macroscopic phase separation of hydrophobic PMSQ condensates and lead to well-defined mesoporous transparent aerogels with high specific pore volume. Mesopores are developed through microscopic phase separation of PMSQ colloid-surfactant complexes in the solvent. Macroscopic phase separation regulates well-defined macropores in the micrometer range on decreasing concentrations of F127, in which microscopic phase separation concurrently takes place in the PMSQ-rich gelling phase after the onset of macroscopic phase separation. Monolithic PMSQ gels with hierarchical macro- and mesopore structures are consequently obtained. © 2011 Materials Research Society.

    DOI: 10.1557/opl.2011.96

    Scopus

    J-GLOBAL

  156. Hierarchically Porous Materials by Phase Separation: Monoliths

    Kazuki Nakanishi

    Hierarchically Structured Porous Materials: From Nanoscience to Catalysis, Separation, Optics, Energy, and Life Science     page: 241 - 267   2011.11

     More details

    Language:English   Publishing type:Part of collection (book)   Publisher:Wiley-VCH  

    DOI: 10.1002/9783527639588.ch8

    Scopus

  157. Hierarchically Structured Porous Materials: Application to Separation Sciences

    Kazuki Nakanishi

    Hierarchically Structured Porous Materials: From Nanoscience to Catalysis, Separation, Optics, Energy, and Life Science     page: 517 - 529   2011.11

     More details

    Language:English   Publishing type:Part of collection (book)   Publisher:Wiley-VCH  

    DOI: 10.1002/9783527639588.ch17

    Scopus

  158. New hierarchically porous titania monoliths for chromatographic separation media Reviewed

    George Hasegawa, Kei Morisato, Kazuyoshi Kanamori, Kazuki Nakanishi

    JOURNAL OF SEPARATION SCIENCE   Vol. 34 ( 21 ) page: 3004 - 3010   2011.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-BLACKWELL  

    Separation media based on hierarchically porous titania (TiO(2)) monoliths for high-performance liquid chromatography (HPLC) have been successfully fabricated by the sol-gel process of titanium alkoxide in a mild condition utilizing a chelating agent and mineral salt. The as-gelled TiO(2) monoliths were subjected to a simple solvent exchange process from ethanol (EtOH) to H(2)O followed by drying and calcination. The resultant monolithic TiO(2) columns consist of anatase crystallites with the typical specific surface area of more than 200 m(2)/g. The resultant monolithic TiO(2) column calcined at 200 and 400 degrees C exhibited a good separation performance for organophosphates as well as for polar benzene derivatives in the normal-phase mode.

    DOI: 10.1002/jssc.201100538

    Web of Science

    Scopus

    PubMed

    Other Link: http://orcid.org/0000-0002-8069-4780

  159. Fabrication of highly crosslinked methacrylate-based polymer monoliths with well-defined macropores via living radical polymerization Reviewed

    George Hasegawa, Kazuyoshi Kanamori, Kazuki Nakanishi, Shigeru Yamago

    POLYMER   Vol. 52 ( 21 ) page: 4644 - 4647   2011.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCI LTD  

    Rigid methacrylate-based polymer monoliths with well-defined macropores have been synthesized from glycerol 1,3-dimethacrylate (GDMA) and trimethylolpropane trimethacrylate (Trim) by organotellurium-mediated living radical polymerization. In each system, poly(ethylene oxide) induced spinodal decomposition with the progress of polymerization of COMA or Trim. Well-defined macroporous structure can be tailored by fixing the bicontinuous structure by the sol gel transition. Both polymer monoliths possessed macropores with narrow size distributions and the macropore size can be controlled simply by varying the amount of poly(ethylene oxide). Starting from GDMA, polymer monoliths with unimodal macropores can be obtained due to the collapse of micro- and mesopores, which were originally embedded in macropore skeletons, by large shrinkage during drying. In contrast, starting from Trim, the obtained polymer monoliths include not only macropores but also micro- and mesopores, which lead to high specific surface area (470 m(2) g(-1)), owing to the higher crosslinking density. (C) 2011 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.polymer.2011.08.028

    Web of Science

    Scopus

    J-GLOBAL

  160. Facile preparation of monolithic magnesium titanates with hierarchical porosity Reviewed

    Olim N. Ruzimuradov, George Hasegawa, Kazuyoshi Kanamori, Kazuki Nakanishi

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   Vol. 119 ( 1390 ) page: 440 - 444   2011.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    In this study, we for the first time came up with a facile approach to fabricate hierarchically porous nano-crystalline monolithic magnesium titanates (MgTi2O5/MgTiO3) by impregnating magnesium chloride into hierarchically porous TiO2 monolith in a solution containing urea followed by appropriate heat-treatment. The formation of porous MgTi2O5/MgTiO3 monolithic materials took place by the solid-state reaction between original TiO2 networks and precipitated MgCO3. The MgCO3 is precipitated within the TiO2 wet gel by the reaction between impregnated Mg2+ and CO2, which is produced by hydrolysis and decarbonation of chelating agent in the TiO2 wet gels and by the hydrolysis of urea at 60 degrees C. The resultant porous magnesium titanates retained narrow macropore size distribution centered at the diameter similar to 1 mu m. These porous monoliths produced by impregnation, a facile and the low-cost method, are expected to open various engineering applications owing to the low thermal expansion coefficients and high chemical and physical stabilities. (C)2011 The Ceramic Society of Japan. All rights reserved

    DOI: 10.2109/jcersj2.119.440

    Web of Science

    Scopus

  161. Performance evaluation of long monolithic silica capillary columns in gradient liquid chromatography using peptide mixtures Reviewed

    Eghbali Hamed, Sandra Koen, Detobel Frederik, Lynen Frederic, Nakanishi Kazuki, Sandra Pat, Desmet Gert

    JOURNAL OF CHROMATOGRAPHY A   Vol. 1218 ( 21 ) page: 3360 - 3366   2011.5

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.chroma.2010.10.045

    Web of Science

    PubMed

  162. Transition from transparent aerogels to hierarchically porous monoliths in polymethylsilsesquioxane sol-gel system. Reviewed

    Kanamori K, Kodera Y, Hayase G, Nakanishi K, Hanada T

    Journal of colloid and interface science   Vol. 357 ( 2 ) page: 336 - 44   2011.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.jcis.2011.02.027

    PubMed

  163. Monolithic silica rod columns for high-efficiency reversed-phase liquid chromatography Reviewed

    Shota Miyazaki, Masakazu Takahashi, Masayoshi Ohira, Hiroyuki Terashima, Kei Morisato, Kazuki Nakanishi, Tohru Ikegami, Kanji Miyabe, Nobuo Tanaka

    JOURNAL OF CHROMATOGRAPHY A   Vol. 1218 ( 15 ) page: 1988 - 1994   2011.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Chromatographic properties of a new type of monolithic silica rod columns were examined. Silica rod columns employed for the study were prepared from tetramethoxysilane, modified with octadecylsilyl moieties, and encased in a stainless-steel protective column with two polymer layers between the silica and the stainless-steel tubing. A 25 cm column provided up to 45,000 theoretical plates for aromatic hydrocarbons, or a minimum plate height of about 5.5 mu m, at optimum linear velocity of ca. 2.3 mm/s and back pressure of 7.5 MPa in an acetonitrile-water (80/20, v/v) mobile phase at 40 degrees C. The permeability of the column was similar to that of a column packed with 5 mu m particles, with K-F about 2.4 x 10(-14) m(2) (based on the superficial linear velocity of the mobile phase), while the plate height value equivalent to that of a column packed with 2.5 mu m particles. Generation of 80,000-120,000 theoretical plates was feasible with back pressure below 30 MPa by employing two or three 25 cm columns connected in series. The use of the long columns enabled facile generation of large numbers of theoretical plates in comparison with conventional monolithic silica columns or particulate columns. Kinetic plot analysis indicates that the monolithic columns operated at 30 MPa can provide faster separations than a column packed with totally porous 3-mu m particles operated at 40 MPa in a range where the number of theoretical plates (N) is greater than 50,000. (C) 2010 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.chroma.2010.11.032

    Web of Science

    Scopus

    PubMed

    J-GLOBAL

  164. Synthesis of hierarchical macro/mesoporous dicalcium phosphate monolith via epoxide-mediated sol-gel reaction from ionic precursors Reviewed

    Tokudome Yasuaki, Miyasaka Akira, Nakanishi Kazuki, Hanada Teiichi

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 57 ( 3 ) page: 269 - 278   2011.3

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s10971-010-2184-y

    Web of Science

  165. Microscopic Characterizations Reviewed

    Haruko Saito, Kazuyoshi Kanamori, Kazuki Nakanishi

    Monolithic Silicas in Separation Science: Concepts, Syntheses, Characterization, Modeling and Applications, First Edition     page: 81 - 102   2011.1

     More details

    Language:English   Publishing type:Part of collection (book)   Publisher:Wiley-VCH  

    DOI: 10.1002/9783527633241.ch5

    Scopus

  166. Synthesis Concepts and Preparation of Silica Monoliths Reviewed

    Kazuki Nakanishi

    Monolithic Silicas in Separation Science: Concepts, Syntheses, Characterization, Modeling and Applications, First Edition     page: 11 - 33   2011.1

     More details

    Language:English   Publishing type:Part of collection (book)   Publisher:Wiley-VCH  

    DOI: 10.1002/9783527633241.ch2

    Scopus

  167. (3-Mercaptopropyl)trimethoxysilane-derived Porous Gel Monolith via Thioacetal Reaction-Assisted Sol-Gel Route Reviewed

    S. Ito, M. Nishi, K. Kanamori, K. Nakanishi, T. Kurahashi, S. Matsubara, Y. Shimotsuma, K. Miura, K. Hirao

    3RD INTERNATIONAL CONGRESS ON CERAMICS (ICC): NOVEL CHEMICAL PROCESSING SOL-GEL AND SOLUTION-BASED PROCESSING   Vol. 18 ( SYMPOSIUM 2A )   2011

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IOP PUBLISHING LTD  

    Porous gel monolith was synthesized by reacting (3mercaptopropyl)trimethoxysilane (MPTMS) with acetone on acidic conditions. It is known that MPTMS itself is difficult to turn into gel on acidic conditions and instead oligomers are obtained owing to the large mercaptopropyl group. In our system, the gels were obtained since acetone worked as a cross-linker via thioacetal reaction. Additionally, Au ions were selectively adsorbed on the obtained gel. When an obtained white gel was soaked in a chloroauric acid solution, the gel turned brown and was getting dark depending on the soaked time; on the other hand, the color of the solution turned from yellow to colorless.

    DOI: 10.1088/1757-899X/18/3/032003

    Web of Science

    Scopus

    Other Link: http://orcid.org/0000-0002-8069-4780

  168. Controlled pore formation in organotrialkoxysilane-derived hybrids: from aerogels to hierarchically porous monoliths Reviewed

    Kazuyoshi Kanamori, Kazuki Nakanishi

    CHEMICAL SOCIETY REVIEWS   Vol. 40 ( 2 ) page: 754 - 770   2011

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    Porous polysilsesquioxane gels derived from sol-gel systems based on trifunctional silanes are reviewed. Although it is well known that trifunctional silanes possess inherent difficulties in forming homogeneous gels, increasing attention is being paid on these precursors and resultant porous polysilsesquioxanes because of hydrophobicity, functionality, and versatile mechanical properties. Much effort has been made to overcome the difficulties for homogeneous gelation, and a number of excellent porous materials with various pore properties have been explored. In this critical review, we put special emphasis on the formation of a well-defined macroporous structure by making use of phase separation, which in turn is a serious problem in obtaining homogeneous gels though. Porous polysilsesquioxane monoliths with the hierarchical structure and transparent aerogels with high mechanical durability are particularly highlighted (169 references).

    DOI: 10.1039/c0cs00068j

    Web of Science

    Scopus

    PubMed

    J-GLOBAL

  169. Pore Structure and Mechanical Properties of Poly(methylsilsesquioxane) Aerogels Reviewed

    Kanamori K., Hayase G., Nakanishi K., Hanada T.

    3RD INTERNATIONAL CONGRESS ON CERAMICS (ICC): NOVEL CHEMICAL PROCESSING SOL-GEL AND SOLUTION-BASED PROCESSING   Vol. 18   2011

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1088/1757-899X/18/3/032001

    Web of Science

  170. Hierarchically Porous Carbon Monoliths with High Surface Area from Bridged Poly(silsesquioxane) without Thermal Activation Process Reviewed

    G. Hasegawa, K. Kanamori, K. Nakanishi, T. Hanada

    3RD INTERNATIONAL CONGRESS ON CERAMICS (ICC): NOVEL CHEMICAL PROCESSING SOL-GEL AND SOLUTION-BASED PROCESSING   Vol. 18 ( SYMPOSIUM 2A )   2011

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IOP PUBLISHING LTD  

    Hierarchically porous carbon monoliths with high specific surface areas have been fabricated by removing nano-sized silica phase from carbon/silica composites pyrolyzed from bridged poly(silsesquioxane). This activation method improves the homogeneity between inner and outer parts of the monoliths compared to the conventional thermal activation methods.

    DOI: 10.1088/1757-899X/18/3/032005

    Web of Science

    Scopus

    Other Link: http://orcid.org/0000-0002-8069-4780

  171. Synthesis of new flexible aerogels from MTMS/DMDMS via ambient pressure drying Reviewed

    Gen Hayase, Kazuyoshi Kanamori, Kazuki Nakanishi, Teiichi Hanada

    IOP Conference Series: Materials Science and Engineering   Vol. 18   page: 032013   2011

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    Although silica aerogel is expected to be the material for energy savings, the lack of the strength prevents from commercial applications such as to low-density thermal insulators and acoustic absorbents. To improve mechanical properties, methyltrimethoxysilane (MTMS) and dimethyldimethoxysilane (DMDMS) are used as the co-precursor of aerogels in this study because the network becomes flexible due to the relatively low cross-linking density and to the unreacted methyl groups. Because of the strong hydrophobicity of MTMS/DMDMS-derived condensates, phase separation occurs, which must be suppressed in aqueous sol to obtain uniform and monolithic gel networks. We also employed surfactant n-hexadecyltrimethylammonium chloride (CTAC) in starting compositions to control phase separation during a 2-step acid/base sol-gel reaction. By changing the starting composition, various microstructures of pores are obtained. In the uniaxial compression test, the aerogel showed high flexibility and spring-back to the original shape after removing the stress.

    DOI: 10.1088/1757-899X/18/3/032013

  172. Synthesis of new flexible aerogels from di- and trifunctional organosilanes

    Gen Hayase, Kazuyoshi Kanamori, Kazuki Nakanishi, Teiichi Hanada

    Materials Research Society Symposium Proceedings   Vol. 1306   page: 68 - 73   2011

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

    Recent years, although silica aerogels are expected to be the promising material for energy savings, the lack of mechanical strength prevents from commercial applications such as to low-density thermal insulators. To improve mechanical properties, methyltrimethoxysilane (MTMS) and dimethyldimethoxysilane (DMDMS) are used in this study as the co-precursor of aerogels because the network becomes flexible due to the relatively low cross-linking density and to the unreacted methyl groups. Because of the strong hydrophobicity of MTMS/DMDMS-derived condensates, phase separation occurs in aqueous sol and must be suppressed to obtain uniform and monolithic gel. We employed surfactant n-hexadecyltrimethylammonium chloride (CTAC) in starting compositions to control phase separation during a 2-step acid/base sol-gel reaction. By changing the starting composition, various microstructures of pores are obtained. In the uniaxial compression test, the aerogel showed high flexibility and spring-back to the original shape after removing the stress. © 2011 Materials Research Society.

    DOI: 10.1557/opl.2011.216

    Scopus

    J-GLOBAL

  173. Monolithic electrode for electric double-layer capacitors based on macro/meso/microporous S-Containing activated carbon with high surface area Reviewed

    George Hasegawa, Mami Aoki, Kazuyoshi Kanamori, Kazuki Nakanishi, Teiichi Hanada, Kiyoharu Tadanaga

    JOURNAL OF MATERIALS CHEMISTRY   Vol. 21 ( 7 ) page: 2060 - 2063   2011

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    Macro/meso/microporous carbon monoliths doped with sulfur have been prepared from sulfonated poly(divinylbenzene) networks followed by the activation with CO2 resulted in the activated carbon monoliths with high surface area of 2400 m(2) g(-1). The monolithic electrode of the activated carbon shows remarkably high specific capacitance (175 F g(-1) at 5 mV s(-1) and 206 F g(-1) at 0.5 A g(-1)).

    DOI: 10.1039/c0jm03793a

    Web of Science

    Scopus

    J-GLOBAL

  174. New flexible aerogels and xerogels derived from methyltrimethoxysilane/dimethyldimethoxysilane co-precursors Reviewed

    Gen Hayase, Kazuyoshi Kanamori, Kazuki Nakanishi

    JOURNAL OF MATERIALS CHEMISTRY   Vol. 21 ( 43 ) page: 17077 - 17079   2011

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    We report new flexible "marshmallow-like&apos;&apos; aerogels and xerogels with a bendable feature from the methyltrimethoxysilane (MTMS) and dimethyldimethoxysilane (DMDMS) co-precursor systems. A 2-step acid/base sol-gel process and surfactant are employed to control the phase separation of the hydrophobic networks, which give porous monolithic gels. The obtained gels become softer and more flexible with increasing DMDMS fractions.

    DOI: 10.1039/c1jm13664j

    Web of Science

    Scopus

    J-GLOBAL

  175. In situ SAXS observation on metal-salt-derived alumina sol-gel system accompanied by phase separation Reviewed

    Yasuaki Tokudome, Kazuki Nakanishi, Kazuyoshi Kanamori, Teiichi Hanada

    JOURNAL OF COLLOID AND INTERFACE SCIENCE   Vol. 352 ( 2 ) page: 303 - 308   2010.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ACADEMIC PRESS INC ELSEVIER SCIENCE  

    The structure formation process of hierarchically porous alumina gels has been investigated by in situ small angle X ray scattering (SAXS) The measurement was performed on the sol-gel solution containing aluminum chloride hexahydrate (AlCl(3) 6H(2)O) poly(ethylene oxide) (PEO) and propylene oxide (PO) The temporal divergence of scattering intensity in the low q regime was observed in the early stage of reaction indicating that the occurrence of spinodal-decomposition-type phase separation Detailed analysis of the SAXS profiles revealed that phase separation occurs between weakly branched polymenzing aluminum hydroxide (AH) and PEO Further progress of the condensation reaction forms phase-separated two phases that is AH rich phase and PEO rich phase with the micrometer range heterogeneity The growth and aggregation of primary particles occurs in the phase-separated AH-rich domain and there fore the addition of PEO influences on the structure in nanometer regime as well as micrometer regime The moderate stability of oligomeric species allows homogeneous condensation reaction parallel to phase separation and successful formation of hierarchically porous alumina gel (C) 2010 Elsevier Inc All rights reserved

    DOI: 10.1016/j.jcis.2010.08.041

    Web of Science

    Scopus

    PubMed

    J-GLOBAL

  176. Facile Preparation of Hierarchically Porous TiO2 Monoliths Reviewed

    George Hasegawa, Kazuyoshi Kanamori, Kazuki Nakanishi, Teiichi Hanada

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   Vol. 93 ( 10 ) page: 3110 - 3115   2010.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-BLACKWELL  

    Monolithic titania (TiO2) with multiscale porous structures have been successfully prepared via the sol-gel route accompanied by phase separation utilizing a chelating agent and mineral salt. The TiO2 gels obtained possess well-defined macropores derived from spinodal decomposition and mesopores as interstices of anatase TiO2 nanocrystallites. Most of the chelating agent were removed by hydrolysis and subsequent decarbonation through the gradual solvent exchange from ethanol to water. The TiO2 particles comprising TiO2 gel skeletons spontaneously converted from amorphous to anatase through the solvent exchange process in a mild condition at 60 degrees C. The present method of the fabrication of porous TiO2 monoliths is advantageous for widespread applications because the reaction occurs under an almost neutral condition and does not require a hydrothermal process, which was indispensable to strengthen the monolith in the method previously reported.

    DOI: 10.1111/j.1551-2916.2010.03831.x

    Web of Science

    Scopus

    J-GLOBAL

  177. Synthesis of high-silica and low-silica zeolite monoliths with trimodal pores Reviewed

    Tokudome Yasuaki, Nakanishi Kazuki, Kosaka Sho, Kariya Ayuta, Kaji Hironori, Hanada Teiichi

    MICROPOROUS AND MESOPOROUS MATERIALS   Vol. 132 ( 3 ) page: 538 - 542   2010.8

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.micromeso.2010.04.005

    Web of Science

  178. Fabrication of activated carbons with well-defined macropores derived from sulfonated poly(divinylbenzene) networks Reviewed

    George Hasegawa, Kazuyoshi Kanamori, Kazuki Nakanishi, Teiichi Hanada

    CARBON   Vol. 48 ( 6 ) page: 1757 - 1766   2010.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    Poly(divinylbenzene) (PDVB) monoliths with well-defined macropores that have been sulfonated and carbonized to obtain macroporous carbon monoliths. The original macroporous PDVB networks have been synthesized by living radical polymerization accompanied by spinodal decomposition. Sulfonation prevents polymer networks from large shrinkage and weight loss during carbonization by heat-treatment in an inert atmosphere. In the case of PDVB gels sulfonated at 120 degrees C using conc. H(2)SO(4), mesopores in the original skeletons as well as macropores are retained after carbonization. The obtained carbon monoliths are subsequently activated by CO(2), which resulted in activated carbons. The specific surface area of the obtained activated carbons reaches up to 2360 m(2) g(-1). (C) 2010 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.carbon.2010.01.019

    Web of Science

    Scopus

    Other Link: http://orcid.org/0000-0002-8069-4780

  179. A New Route to Monolithic Macroporous SiC/C Composites from Biphenylene-bridged Polysilsesquioxane Gels Reviewed

    George Hasegawa, Kazuyoshi Kanamori, Kazuki Nakamshi, Teiichi Hanada

    CHEMISTRY OF MATERIALS   Vol. 22 ( 8 ) page: 2541 - 2547   2010.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    Macroporous polysilsesquioxane monoliths have been synthesized from biphenylene-bridged alkoxysilane via the sol-gel transition and concurrent phase separation both induced by the polycondensation reaction The obtained polysilsesquioxane gels have been subsequently converted to macroporous SiC/C composites by the carbothermal reduction The SiC/C monoliths thus obtained involve no visible cracks and their porosity reaches as high as &gt;90%. In addition, according to the nitrogen adsorption-desorption measurement results, the micro- and mesopore characteristics of the samples did not undergo a significant change during the carbothermal reduction and the SiC/C composites have large specific surface areas owing to the microporous carbons in the skeletons These composites therefore are more suitable for the applications to gas storage and catalyst supports compared to pure SiC.

    DOI: 10.1021/cm9034616

    Web of Science

    Scopus

    J-GLOBAL

  180. Facile preparation of transparent monolithic titania gels utilizing a chelating ligand and mineral salts Reviewed

    George Hasegawa, Kazuyoshi Kanamori, Kazuki Nakanishi, Teiichi Hanada

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 53 ( 1 ) page: 59 - 66   2010.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER  

    Highly homogeneous transparent titania gels have been successfully prepared from titanium alkoxide by a sol-gel method utilizing chelating agent, ethyl acetylacetate (EtAcAc), in the presence of strong acid anions. Only catalytic amount of a strong acid anion suppress the rapid hydrolysis of titanium alkoxide by blocking the nucleophilic attack of HO(-) and H(2)O, and the resultant moderate sol-gel reactions thus afford homogeneous gelation, leading to transparent monolithic titania gels. Gelation time can be widely controlled by changing amounts of water, chelating agent and salt. The ability of salts to suppress the too abrupt sol-gel reactions is strongly dependent on the electronegativity of anions and valence of cations. With employing NH(4)NO(3) as a suppressing electrolyte, the obtained titania gels can be converted to pure TiO(2) by simple washing and heat-treatment, and transformations to anatase and rutile structures were found to start at 400 and 600 A degrees C, respectively.

    DOI: 10.1007/s10971-009-2056-5

    Web of Science

    Scopus

    J-GLOBAL

  181. Hierarchically porous carbon monoliths with high surface area from bridged polysilsesquioxanes without thermal activation process Reviewed

    George Hasegawa, Kazuyoshi Kanamori, Kazuki Nakanishi, Teiichi Hanada

    CHEMICAL COMMUNICATIONS   Vol. 46 ( 42 ) page: 8037 - 8039   2010

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    Hierarchically porous carbon monoliths with high specific surface areas have been fabricated by removing nano-sized silica phase from carbon/silica composites pyrolyzed from bridged polysilsesquioxane. This activation method improves the homogeneity between inner and outer parts of the monoliths compared to the conventional thermal activation methods.

    DOI: 10.1039/c0cc02974b

    Web of Science

    Scopus

    PubMed

    J-GLOBAL

  182. Effects of Starting Compositions on the Properties of Methylsilsesquioxane Aerogels Reviewed

    Gen Hayase, Kazuyoshi Kanamori, Kazuki Nakanishi, Teiichi Hanada

    MRS Online Proceedings Library Archive   Vol. 1247   page: 1247-C08-17   2010

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)  

  183. Macro- and microporous carbon monoliths with high surface areas pyrolyzed from poly(divinylbenzene) networks Reviewed

    Joji Hasegawa, Kazuyoshi Kanamori, Kazuki Nakanishi, Teiichi Hanada

    COMPTES RENDUS CHIMIE   Vol. 13 ( 1-2 ) page: 207 - 211   2010

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER  

    Carbon monoliths with well-defined macropores and high surface areas were prepared by carbonization of macroporous poly(divinylbenzene) (PDVB) monoliths The carbonization reactions of PDVB networks are studied by thermal analysis and FT-IR measurements. According to the measurement results. the PDVB networks are mostly pyrolyzed at 430 degrees C and their structures dynamically change to graphite-like structure between 600 and 700 degrees C The macropore structure retained while the mesopores disappeared after carbonization In addition, the surface area of the obtained carbons dramatically increased over 900 degrees C The typical carbon monolith carbonized at 1000 degrees C for 2 h had a surface area of 1500 m(2) g(-1) and uniform macropores with a diameter of jam To cite this article: J. Hasegawa et al., C. R. Chunk 13 (2010). (C) 2009 Academic des sciences. Published by Elsevier Masson SAS All rights reserved

    DOI: 10.1016/j.crci.2009.04.003

    Web of Science

    Scopus

    J-GLOBAL

  184. Sol-gel synthesis, porous structure, and mechanical property of polymethylsilsesquioxane aerogels Reviewed

    Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   Vol. 117 ( 1372 ) page: 1333 - 1338   2009.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.2109/jcersj2.117.1333

    Web of Science

  185. ワイドポアモノリスシリカカラムによるネイティブタンパク質の分離性能評価 Reviewed

    森坂裕信, 桐野彩, 水口博義, 中西和樹, 植田充美

    Chromatography   Vol. 30 ( Supplement 2 ) page: 42 - 43   2009.10

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    J-GLOBAL

  186. Semi-micro-monolithic columns using macroporous silica rods with improved performance Reviewed

    Morisato Kei, Miyazaki Shota, Ohira Masayoshi, Furuno Masahiro, Nyudo Masahiko, Terashima Hiroyuki, Nakanishi Kazuki

    JOURNAL OF CHROMATOGRAPHY A   Vol. 1216 ( 44 ) page: 7384 - 7387   2009.10

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.chroma.2009.05.028

    Web of Science

    PubMed

  187. Sol-gel synthesis of macro-mesoporous titania monoliths and their applications to chromatographic separation media for organophosphate compounds Reviewed

    Konishi Junko, Fujita Koji, Nakanishi Kazuki, Hirao Kazuyuki, Morisato Kei, Miyazaki Shota, Ohira Masayoshi

    JOURNAL OF CHROMATOGRAPHY A   Vol. 1216 ( 44 ) page: 7375 - 7383   2009.10

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.chroma.2009.06.016

    Web of Science

    PubMed

  188. Structural characterization of hierarchically porous alumina aerogel and xerogel monoliths. Reviewed

    Tokudome Y, Nakanishi K, Kanamori K, Fujita K, Akamatsu H, Hanada T

    Journal of colloid and interface science   Vol. 338 ( 2 ) page: 506 - 13   2009.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.jcis.2009.06.042

    PubMed

  189. Performance of wide-pore monolithic silica column in protein separation Reviewed

    Morisaka Hironobu, Kobayashi Kengo, Kirino Aya, Furuno Masahiro, Minakuchi Hiroyoshi, Nakanishi Kazuki, Ueda Mitsuyoshi

    JOURNAL OF SEPARATION SCIENCE   Vol. 32 ( 15-16 ) page: 2747 - 2751   2009.8

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/jssc.200800653

    Web of Science

    PubMed

  190. Rigid crosslinked polyacrylamide monoliths with well-defined macropores synthesized by living polymerization. Reviewed

    Hasegawa J, Kanamori K, Nakanishi K, Hanada T, Yamago S

    Macromolecular rapid communications   Vol. 30 ( 12 ) page: 986 - 90   2009.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/marc.200900066

    PubMed

  191. Effect of La addition on thermal microstructural evolution of macroporous alumina monolith prepared from ionic precursors Reviewed

    Yasuaki Tokudome, Kazuki Nakanishi, Teiichi Hanada

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   Vol. 117 ( 1363 ) page: 351 - 355   2009.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    Porous alumina monoliths with high thermal stability have been prepared using sol-gel processing from ionic precursors. Samples were synthesized from AlCl3 center dot 6H(2)O and LaCl3 center dot 7H(2)O dissolved in a H2O/etanol solution containing poly(ethylene oxide) (PEO) via propylene oxide (PO) involved sol-gel reaction accompanied by phase separation. The heat-treated gels consist of controllable size of macropores and La-doped alumina skeletons. Doped lanthanum ions are homogeneously embedded in the gel matrix, which retards the phase transition from gamma-alumina to alpha-alumina during the sintering. The 3 mol% La-doped aluminate exhibits the BET surface area of 55.3 m(2)/g, after the heat treatment at 1100 degrees C for 24 It. Drying condition are also related to the thermal stability of obtained gels. Aluminate aerogels show higher thermal stability than corresponding xerogels due to relatively large mesopore size and high porosity. As a result, the 3 mol% lanthanum doped aluminate aerogel shows BET surface area as high as 82.5 m(2)/g even after heat treatment at 1100 degrees C for 24 h. (C) 2009 The Ceramic Society of Japan. All rights reserved.

    DOI: 10.2109/jcersj2.117.351

    Web of Science

    Scopus

  192. Spinodal decomposition in siloxane sol-gel systems in macroporous media Reviewed

    Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi

    SOFT MATTER   Vol. 5 ( 16 ) page: 3106 - 3113   2009

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1039/b903444g

    Web of Science

  193. Elastic Aerogels and Xerogels Synthesized From Methyltrimethoxysilane (MTMS) Reviewed

    Kazuyoshi Kanamori, Kazuki Nakanishi, Teiichi Hanada

    POLYMER-BASED SMART MATERIALS - PROCESSES, PROPERTIES AND APPLICATION   Vol. 1134   page: 173 - +   2009

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:MATERIALS RESEARCH SOC  

    Transparent organic-inorganic hybrid aerogels and aerogel-like xerogels have been prepared from methyltrimethoxysilane (MTMS) respectively by supercritical drying (SCD) and ambient pressure drying (APD). The new aerogels and xerogels significantly deform without collapsing on uniaxial compression and almost fully relax when unloaded. This elastic behavior., termed as "spring-back", allows APD without noticeable shrinkage and cracking. The flexible network composed of lower cross-linking density (up to three bonds per every silicon atom) compared to silica gels (up to four bonds) and repulsion between hydrophobic methyl groups bonded to every silicon atom largely contributes to the pronounced deformability and relaxing, respectively. Lower surface silanol group density also plays a crucial role for the "spring-back" behavior.

    Web of Science

  194. Preparation of Macroporous Poly(divinylbenzene) Gels Via Living Radical Polymerization Reviewed

    Joji Hasegawa, Kazuyoshi Kanamori, Kazuki Nakanishi, Teiichi Hanada, Shigeru Yamago

    POLYMER-BASED SMART MATERIALS - PROCESSES, PROPERTIES AND APPLICATION   Vol. 1134   page: 139 - +   2009

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:MATERIALS RESEARCH SOC  

    Macroporous cross-linked polymeric dried gels have been obtained by inducing phase separation in a homogeneous poly(divinylbenzene) (PDVB) network formed by organotellurium-mediated living radical polymerization (TERP). The living polymerization reaction of DVB with the coexistence of a non-reactive polymeric agent, poly(dimethylsiloxane) (PDMS), in solvent 1,3,5-trimethylbenzene (TMB) resulted in polymerization-induced phase separation (spinodal decomposition), and the transient structure of spinodal decomposition has been frozen by gelation. Well-defined macroporous monolithic dried gels with bicontinuous structure in the micrometer scale are obtained after removing PDMS and TMB by simple washing and drying. The properties of the macropores have been controlled by changing starting composition.

    Web of Science

  195. Preparation of Macroporous Poly(divinylbenzene) Gels Via Living Radical Polymerization

    Joji Hasegawa, Kazuyoshi Kanamori, Kazuki Nakanishi, Teiichi Hanada, Shigeru Yamago

    POLYMER-BASED SMART MATERIALS - PROCESSES, PROPERTIES AND APPLICATION   Vol. 1134   page: 139 - +   2009

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:MATERIALS RESEARCH SOC  

    Macroporous cross-linked polymeric dried gels have been obtained by inducing phase separation in a homogeneous poly(divinylbenzene) (PDVB) network formed by organotellurium-mediated living radical polymerization (TERP). The living polymerization reaction of DVB with the coexistence of a non-reactive polymeric agent, poly(dimethylsiloxane) (PDMS), in solvent 1,3,5-trimethylbenzene (TMB) resulted in polymerization-induced phase separation (spinodal decomposition), and the transient structure of spinodal decomposition has been frozen by gelation. Well-defined macroporous monolithic dried gels with bicontinuous structure in the micrometer scale are obtained after removing PDMS and TMB by simple washing and drying. The properties of the macropores have been controlled by changing starting composition.

    Web of Science

    Scopus

  196. Fabrication of macroporous silicon carbide ceramics by intramolecular carbothermal reduction of phenyl-bridged polysilsesquioxane Reviewed

    George Hasegawa, Kazuyoshi Kanamori, Kazuki Nakanishi, Teiichi Hanada

    JOURNAL OF MATERIALS CHEMISTRY   Vol. 19 ( 41 ) page: 7716 - 7720   2009

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    Macroporous SiC ceramics were obtained from porous phenyl-bridged polysilsesquioxane prepared by a sol-gel method accompanied by spinodal decomposition subsequently subjected to intramolecular carbothermal reduction. By this method, we can obtain macroporous SiC ceramics with improved atomic-level homogeneity and controlled pore size more easily than by intermolecular carbothermal reduction using a mixture of SiO(2) and carbon powder. Therefore, the resultant SiC ceramics have sufficiently high purity without washing with hydrofluoric acid to remove residual SiO(2).

    DOI: 10.1039/b913992c

    Web of Science

    Scopus

  197. Phase separation in silica sol-gel system containing anionic surfactant

    Taisuke Matsui, Kazuki Nakanishi, Kazuyoshi Kanamori, Teiichi Hanada

    Materials Research Society Symposium Proceedings   Vol. 1056   page: 418 - 423   2008.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    By inducing phase separation parallel to the sol-gel transition of alkoxy-derived silica systems, silica monoliths with well-defined co-continuous macropores were obtained from the systems containing anionic surfactants.We adopted three kinds of anionic surfactants which differ from each other in the length of alkyl chain (CH3(CH2)i7SO3Na, CH 3(CH2)i5SO3Na, CH3(CH 2)i3SO3Na).Mesopores were also found in the silica skeletons presumably by the supramolecular templating.Characterization of the dried or heat-treated samples was carried out by a scanning electron microscope (SEM) and nitrogen adsorption measurements.Experimental results showed that due to the moderate interaction between silica oligomers and surfactants, most of the surfactants are distributed to the solvent phase which determines the macropore volume.The median size and volume of the macropores could be controlled independently by the starting composition.In the absence of any additive to enhance templating by the surfactant, the samples exhibited only amorphous mesopores. © 2008 Materials Research Society.

    Scopus

  198. Elastic organic-inorganic hybrid aerogels and xerogels Reviewed

    Kazuyoshi Kanamori, Mamoru Aizawa, Kazuki Nakanishi, Teiichi Hanada

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 48 ( 1-2 ) page: 172 - 181   2008.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER  

    Novel aerogels and xerogels with methylsilsesquioxane (MSQ, CH(3)SiO(1.5)) networks have been prepared by a modified sol-gel process using surfactant and urea as a phase-separation inhibitor and as an accelerator for the condensation reaction, respectively. Optimized aerogels dried under a supercritical condition not only showed the similar properties as conventional pure silica aerogels such as high transparency and porosity etc, but also demonstrated outstanding mechanical strength against compression; the aerogel drastically shrank upon loading and then recovered when unloaded, which is called a "spring-back" behavior. On ambient pressure drying, the wet gel also exhibited the similar response against compression stress originated from the capillary pressure, and thus xerogels with the comparative structure and properties to those of corresponding aerogels have also been obtained. This unusual mechanical behavior is attributed to the trifunctional flexible networks of MSQ, low silanol concentration which prevents the irreversible shrinkage, and high concentration of a hydrophobic methyl group directly attached to every silicon atom which helps re-expansion after the temporal shrinkage.

    DOI: 10.1007/s10971-008-1756-6

    Web of Science

    Scopus

    J-GLOBAL

  199. Facile Synthesis of Macroporous Cross-Linked Methacrylate Gels by Atom Transfer Radical Polymerization Reviewed

    Kazuyoshi Kanamori, Joji Hasegawa, Kazuki Nakanishi, Tefichi Hanada

    MACROMOLECULES   Vol. 41 ( 19 ) page: 7186 - 7193   2008.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    Macroporous cross-linked organic polymer monoliths with well-defined bicontinuous structure have been synthesized from 1,3-glycerol dimethacrylate (GDMA) in a solvent utilizing atom transfer radical polymerization (ATRP). With the addition of an adequate polymeric agent, poly(ethylene oxide) (PEO), spinodal decomposition was induced in the course of polymerization of GDMA. A homogeneous gelation by ATRP solidified the temporal biphasic morphology of spinodal decomposition, resulting in well-defined macroporous gels after drying. Macroporous dried gels obtained in this way comprise interconnected skeletons and macropores, which is characteristic for spinodal decomposition. Macropore size and volume were controlled simply by altering the starting composition. The mechanism of spinodal decomposition is deduced that the separation takes place between polymerizing GDMA and PEO, but FTIR and thermal analyses suggested the amount of PEO that is distributed in GDMA-rich phase cannot be neglected. Free radical polymerization, which is generally utilized for synthesis of porous polymeric gels, usually leads to heterogeneous cross-linking forming local microgels and hinders the occurrence of spinodal decomposition in a cross-linking system over extended length scales. On the other hand, living polymerization allowed homogeneous cross-linking; hence, isotropic spinodal decomposition was induced in the copresence of PEO. The facile synthesis method presented here will lead to more precise control of pore properties of cross-linked organic polymer gels.

    DOI: 10.1021/ma800563p

    Web of Science

    Scopus

    J-GLOBAL

  200. Scattering-based hole burning through volume speckles in a random medium with tunable diffusion constant Reviewed

    Murai Shunsuke, Fujita Koji, Hirao Takayuki, Nakanishi Kazuki, Hirao Kazuyuki, Tanaka Katsuhisa

    APPLIED PHYSICS LETTERS   Vol. 93 ( 15 )   2008.10

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/1.2955830

    Web of Science

  201. Preparation and properties of radiofrequency sputtered X-ray amorphous films in the system SiO2-ZrO2 Reviewed

    Sawa Akira, Nakanishi Kazuki, Hanada Teiichi

    THIN SOLID FILMS   Vol. 516 ( 15 ) page: 4665 - 4672   2008.6

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.tsf.2007.08.012

    Web of Science

  202. Preparation of monolithic silica columns for high-performance liquid chromatography Reviewed

    Nunez Oscar, Nakanishi Kazuki, Tanaka Nobuo

    JOURNAL OF CHROMATOGRAPHY A   Vol. 1191 ( 1-2 ) page: 231 - 252   2008.5

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.chroma.2008.02.029

    Web of Science

    PubMed

  203. Alkoxy-derived multiscale porous TiO2 gels probed by ultra-small-angle X-ray scattering and small-angle X-ray scattering Reviewed

    Junko Konishi, Koji Fujita, Kazuki Nakanishi, Shotaro Nishitsuji, Mikihito Takenaka, Kiyotaka Miura, Kazuyuki Hirao

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 46 ( 1 ) page: 63 - 69   2008.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER  

    Titania (TiO2) monoliths with well-defined bicontinuous macropores and gel skeletons were prepared through the alkoxy-derived sol-gel process accompanied by spinodal decomposition, and the structural evolution during evaporation drying and heat treatment was probed by a combination of ultra-small-angle X-ray scattering and small-angle X-ray scattering. X-ray scattering profiles of wet and dried gels revealed that microporous structures related to the existence of primary particles are present in the gel skeletons at the wet stage and are preserved during drying. Additionally, it is found that the primary particles swollen in the wet condition are dried to compact aggregates to produce the smooth surface of gel skeletons. Upon heating at 400 degrees C, the particle-particle correlation associated with regularity of mesostructures is enhanced. From nitrogen adsorption-desorption measurements, the average pore size is less than 1 nm in the dried gel and increases to 3.1 nm by the heat treatment. Homogeneous growth of primary particles due to interparticle-polycondensation reaction is responsible for the increased size and uniform distribution of mesopores in the heat-treated gel.

    DOI: 10.1007/s10971-008-1694-3

    Web of Science

    Scopus

  204. Crystalline ZrO2 monoliths with well-defined macropores and mesostructured skeletons prepared by combining the alkoxy-derived sol-gel process accompanied by phase separation and the solvothermal process Reviewed

    Junko Konishi, Koji Fujita, Satoshi Oiwa, Kazuki Nakanishi, Kazuyuki Hirao

    CHEMISTRY OF MATERIALS   Vol. 20 ( 6 ) page: 2165 - 2173   2008.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    We have successfully prepared multiscale porous crystalline zirconia (ZrO2) monoliths by combining alkoxy-derived sol-gel process accompanied by phase-separation and the solvothermal process. The gelation can be controlled by the addition of N-methylformamide to the starting solution, while the phase separation is induced by the incorporation of poly(ethylene oxide). Amorphous ZrO2 monolithic gels with well-defined bicontinuous macropores and microstructured skeletons are obtained when the transient. structure of polymerization-induced phase separation is fixed by the gelation. The size of the macropores is controlled in the range of 300 nm to 2 mu m by adjusting the amount of poly(ethylene oxide). The solvent exchange of the mother liquor in the as-gelled wet specimens with absolute ethanol, followed by the solvothermal treatment at temperatures above 210 degrees C, brings about the formation of mesopores and stabilizes tetragonal ZrO2 nanocrystals without disturbing the macroporous morphology. The resultant macro-mesoporous crystalline ZrO2 gels possess the surface area over 200 m(2) g(-1).

    DOI: 10.1021/cm703351d

    Web of Science

    Scopus

    J-GLOBAL

  205. Multiscale templating of siloxane gels via polymerization-induced phase separation Reviewed

    Kazuki Nakanishi, Tomohiko Amatani, Seiji Yano, Tetsuya Kodaira

    CHEMISTRY OF MATERIALS   Vol. 20 ( 3 ) page: 1108 - 1115   2008.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    By combining the micellar templating in nanometer-scale with the polymerization-induced phase separation in micrometer-scale, we can synthesize monolithic silica or silsesquioxane gel materials with hierarchical well-defined macropores and shape-controlled mesopores. Depending on the mechanism of enhancing micellar-templating of siloxane oligomers, macroframeworks containing long-range-ordered cylindrical mesopores with different degrees of order have been produced. Alkylene-bridged silicon alkoxides can also be prepared into similarly hierarchical porous structures with broadened variations in framework morphology. These examples demonstrate the versatility of using phase-separation in micellar-templated gelling systems to obtain well-defined macroporous structures.

    DOI: 10.1021/cm702486b

    Web of Science

    Scopus

    J-GLOBAL

  206. Cr3+-doped macroporous Al2O3 monoliths prepared by the metal-salt-derived sol-gel method Reviewed

    Fujita Koji, Tokudome Yasuaki, Nakanishi Kazuki, Miura Kiyotaka, Hirao Kazuyuki

    JOURNAL OF NON-CRYSTALLINE SOLIDS   Vol. 354 ( 2-9 ) page: 659 - 664   2008.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Journal of Non-Crystalline Solids  

    Cr3+-doped alumina (Al2O3) monoliths with well-defined macropores have been synthesized from the aqueous and ethanolic solution of aluminum and chromium salts in the presence of propylene oxide (PO) and poly(ethylene oxide) (PEO) using the sol-gel method accompanied by phase separation. The addition of PEO to the starting solution induces the phase separation, whereas the introduction of PO controls the gelation. The bicontinuous macroporous structures are obtained by inducing the phase separation parallel to the gelation, and the pore size can be controlled by adjusting the composition of starting solutions. The dried gel and that heat-treated at 700 °C are amorphous. As the heat-treatment temperature is increased over 700 °C, nanocrystalline γ-Al2O3 is precipitated at 800 °C, a mixture of θ- and α-Al2O3 phases appears at 1100 °C, and a single of α-Al2O3 is obtained at 1200 °C, while keeping the bicontinuous macroporous structure. Cr3+-doped α-Al2O3 monoliths with well-defined macropores exhibit photoluminescence as observed for ruby, indicating that Cr3+ ions are homogenously dispersed into the skeletons of bicontinuous network and substitute uniformly for the Al3+ sites. © 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jnoncrysol.2007.06.091

    Web of Science

    Scopus

  207. Cr3+-doped macroporous Al2O3 monoliths prepared by the metal-salt-derived sol-gel method Reviewed

    Koji Fujita, Yasuaki Tokudome, Kazuki Nakanishi, Kiyotaka Miura, Kazuyuki Hirao

    JOURNAL OF NON-CRYSTALLINE SOLIDS   Vol. 354 ( 2-9 ) page: 659 - 664   2008.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Cr3+-doped alumina (Al2O3) monoliths with well-defined macropores have been synthesized from the aqueous and ethanolic solution of aluminum and chromium salts in the presence of propylene oxide (PO) and poly(ethylene oxide) (PEO) using the sol-gel method accompanied by phase separation. The addition of PEO to the starting solution induces the phase separation, whereas the introduction of PO controls the gelation. The bicontinuous macroporous structures are obtained by inducing the phase separation parallel to the gelation, and the pore size can be controlled by adjusting the composition of starting solutions. The dried gel and that heat-treated at 700 degrees C are amorphous. As the heat-treatment temperature is increased over 700 degrees C, nanocrystalline gamma-Al2O3 is precipitated at 800 degrees C, a mixture of theta- and (alpha-Al2O3 phases appears at 1100 degrees C, and a single of alpha-Al2O3 is obtained at 1200 degrees C, while keeping the bicontinuous macroporous structure. Cr3+-doped alpha-Al2O3 monoliths with well-defined macropores exhibit photoluminescence as observed for ruby, indicating that Cr3+ ions are homogenously dispersed into the skeletons of bicontinuous network and substitute uniformly for the Al3+ sites. (c) 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jnonerysol.2007.06.091

    Web of Science

    J-GLOBAL

  208. 22aYE-7 Effect of the gel structure on the acoustic property of liquid ^4He in silica gel

    Ohmori K., Tanaka T., Abe S., Tsujii H., Suzuki H., Matsumoto K., Nakanishi K., Kanamori K.

    Meeting Abstracts of the Physical Society of Japan   Vol. 63 ( 0 )   2008

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.11316/jpsgaiyo.63.2.4.0_709_3

  209. Phase separation in alkoxy-derived silica system containing polyacrylamide Reviewed

    Kawamoto Kousuke, Nakanishi Kazuki, Hanada Teiichi

    ORGANIC/INORGANIC HYBRID MATERIALS - 2007   Vol. 1007   page: 63 - 68   2008

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  210. Phase separation in Al2O3 sol-gel system incorporated with high molecular weight poly(ethylene oxide) Reviewed

    Tokudome Yasuaki, Nakanishi Kazuki, Fujita Koji, Miura Kiyotaka, Hirao Kazuyuki

    ORGANIC/INORGANIC HYBRID MATERIALS - 2007   Vol. 1007   page: 69 - 74   2008

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Web of Science

  211. Hierarchically porous oxides, hybrids and polymers via sol-gel accompanied by phase separation Reviewed

    Kazuki Nakanishi

    ORGANIC/INORGANIC HYBRID MATERIALS - 2007   Vol. 1007   page: 51 - 62   2008

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:MATERIALS RESEARCH SOCIETY  

    In various crosslinking systems containing metal oxides, organo-siloxane polymers and pure hydrocarbons, monolithic materials with hierarchical well-defined macropores and controlled mesopores have been synthesized. Synthetic progress in alkoxy-derived macroporous silica lead to the preparation of long-range ordered mesoporous skeletons in well-defined. macroporous framework. Alkylene-bridged silicon alkoxides can also be prepared into similarly hierarchical porous structures with broadened variations in framework morphology. Macro-mesoporous alkoxy-derived pure titania and zirconia have been prepared using hydrochloric acid - mediated processes. Compared with those prepared from colloidal dispersions, alkoxy-derived macroporous titania exhibited much higher mechanical strength. Titania monolith is a promising candidate as a separation medium to discriminate phosphorylated compounds in a liquid chromatography mode. Pure alumina macroporous monolith has been first synthesized from aluminum salt using propylene glycol as a proton scavenger to thrust the solution pH from acidic into neutral conditions. Alumina-based complex oxides such as garnets and spinels can also be prepared in pure phases. Polymerization and phase separation in organic crosslinker system was also controlled to obtain well-defined co-continuous macro-frameworks instead of those composed of aggregated particles. These examples demonstrate the versatility of using phase-separation in gelling systems to obtain well-defined macroporous structures.

    Web of Science

  212. Phase separation in alkoxy-derived silica system containing polyacrylamide Reviewed

    Kousuke Kawamoto, Kazuki Nakanishi, Teiichi Hanada

    ORGANIC/INORGANIC HYBRID MATERIALS - 2007   Vol. 1007   page: 63 - 68   2008

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:MATERIALS RESEARCH SOCIETY  

    By inducing phase separation parallel to the sol-gel transition of alkoxy-derived silica systems, gels having both macroporous and mesoporous structures can be obtained. Using poly(acrylamide) (PAAm) as a phase-separation inducer, macro/mesoporous silica gels were synthesized. After solvent exchange by water, the size distribution of mesopores of wet gels was evaluated by thermoporometry using a differential scanning calorimetry (DSC). Alternatively, gels were evaporation-dried after solvent exchange by ethanol or water/ethanol, followed by heat-treatment to completely remove volatile and organic components. Characterization of the dried or heat-treated samples was carried out using a scanning electron microscope (SEM) and by nitrogen adsorption measurements. Experimental results showed that the interaction between PAAm and silica is not so strong as the case of polymers having poly(oxyethylene) chains. The contribution of the secondary phase separation within the crosslinking silica-rich phase was suggested to be responsible for the mesopore formation in the PAAm-silica system.

    Web of Science

  213. Phase separation in alkoxy-derived silica system containing polyacrylamide Reviewed

    Kousuke Kawamoto, Kazuki Nakanishi, Teiichi Hanada

    ORGANIC/INORGANIC HYBRID MATERIALS - 2007   Vol. 1007   page: 63 - 68   2008

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:MATERIALS RESEARCH SOCIETY  

    By inducing phase separation parallel to the sol-gel transition of alkoxy-derived silica systems, gels having both macroporous and mesoporous structures can be obtained. Using poly(acrylamide) (PAAm) as a phase-separation inducer, macro/mesoporous silica gels were synthesized. After solvent exchange by water, the size distribution of mesopores of wet gels was evaluated by thermoporometry using a differential scanning calorimetry (DSC). Alternatively, gels were evaporation-dried after solvent exchange by ethanol or water/ethanol, followed by heat-treatment to completely remove volatile and organic components. Characterization of the dried or heat-treated samples was carried out using a scanning electron microscope (SEM) and by nitrogen adsorption measurements. Experimental results showed that the interaction between PAAm and silica is not so strong as the case of polymers having poly(oxyethylene) chains. The contribution of the secondary phase separation within the crosslinking silica-rich phase was suggested to be responsible for the mesopore formation in the PAAm-silica system.

    Web of Science

    Scopus

  214. Phase separation in Al<sub>2</sub>O<sub>3</sub> sol-gel system incorporated with high molecular weight poly(ethylene oxide) Reviewed

    Y. Tokudome, K. Nakanishi, K. Fujita, K. Miura, K. Hirao

    Materials Research Society Symposium Proceedings   Vol. 1007   page: 69 - 74   2008

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  215. Phase separation in Al2O3 sol-gel system incorporated with high molecular weight poly(ethylene oxide) Reviewed

    Yasuaki Tokudome, Kazuki Nakanishi, Koji Fujita, Kiyotaka Miura, Kazuyuki Hirao

    ORGANIC/INORGANIC HYBRID MATERIALS - 2007   Vol. 1007   page: 69 - 74   2008

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:MATERIALS RESEARCH SOCIETY  

    Pure alumina monoliths with well-defined macropores and mesostructured skeleton have been synthesized via a spontaneous route from the aqueous and ethanolic solution of aluminum salts in the presence of propylene oxide and high molecular weight poly(ethylene oxide)(PEO). The addition of propylene oxide to the starting solution controls the gelation, while the addition of PEO induces the phase separation. Appropriate choice of the starting composition, with which the phase separation and gelation concur, produces large-dimension (10mmx10mmx10mm), bicontinuous macroporous Al2O3 monoliths. The mean size of the continuously connected pores is controlled in the micrometer range, depending on the PEO concentration and polarity of the solution. On the other hand, micropores and mesopores, originated from the interstices among primary particles, exhibit median pore size of about 2.6 mn and the BET surface area as high as 396 m(2)/g after dried temperature at 40 degrees C.

    Web of Science

  216. Phase separation in Al2O3 sol-gel system incorporated with high molecular weight poly(ethylene oxide) Reviewed

    Yasuaki Tokudome, Kazuki Nakanishi, Koji Fujita, Kiyotaka Miura, Kazuyuki Hirao

    ORGANIC/INORGANIC HYBRID MATERIALS - 2007   Vol. 1007   page: 69 - 74   2008

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:MATERIALS RESEARCH SOCIETY  

    Pure alumina monoliths with well-defined macropores and mesostructured skeleton have been synthesized via a spontaneous route from the aqueous and ethanolic solution of aluminum salts in the presence of propylene oxide and high molecular weight poly(ethylene oxide)(PEO). The addition of propylene oxide to the starting solution controls the gelation, while the addition of PEO induces the phase separation. Appropriate choice of the starting composition, with which the phase separation and gelation concur, produces large-dimension (10mmx10mmx10mm), bicontinuous macroporous Al2O3 monoliths. The mean size of the continuously connected pores is controlled in the micrometer range, depending on the PEO concentration and polarity of the solution. On the other hand, micropores and mesopores, originated from the interstices among primary particles, exhibit median pore size of about 2.6 mn and the BET surface area as high as 396 m(2)/g after dried temperature at 40 degrees C.

    Web of Science

    Scopus

  217. Sol-gel synthesis of macroporous YAG from ionic precursors via phase separation route Reviewed

    Yasuaki Tokudome, Koji Fujita, Kazuki Nakanishi, Kazuyoshi Kanamori, Kiyotaka Miura, Kazuyuki Hirao, Teiichi Hanada

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   Vol. 115 ( 1348 ) page: 925 - 928   2007.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    Yttrium aluminum garnet, Y3Al5O12, (YAG) monoliths with well-defined macropores have been prepared from ionic precursors using the sol-gel method accompanied by phase separation. The addition of propylene oxide to the starting solution controls the gelation, while the addition of poly(ethylene oxide) induces the phase separation. Polymerization-induced phase separation and gelation concur by an appropriate selection of the starting composition, which allows the production of bicontinuous macroporous nanocomposite gels in large dimensions (similar to 10 x 10 x 10 mm(3)). During heat treatment at 800 degrees C, the monolithic nanocomposite gels crystallize into YAG without the formation of any intermediate phases or the precipitation of impurity phases, indicating higher homogeneity of cation distribution in the dried gels. The macroporous YAG network was maintained even after heat treatment at 1000 degrees C for 10 h.

    DOI: 10.2109/jcersj2.115.925

    Web of Science

  218. Sur-face interaction of well-defined, concentrated poly,(2-hydroxyethyl methacrylate) brushes with proteins Reviewed

    Yoshikawa Chiaki, Goto Atsushi, Tsujii Yoshinobu, Ishizuka Norio, Nakanishi Kazuki, Fukuda Takeshi

    JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY   Vol. 45 ( 21 ) page: 4795 - 4803   2007.11

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/pola.22224

    Web of Science

  219. Real space observation of silica monoliths in the formation process. Reviewed

    Saito H, Kanamori K, Nakanishi K, Hirao K

    Journal of separation science   Vol. 30 ( 17 ) page: 2881 - 7   2007.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/jssc.200700360

    PubMed

  220. Sol-gel with phase separation. Hierarchically porous materials optimized for high-performance liquid chromatography separations Reviewed

    Nakanishi Kazuki, Tanaka Nobuo

    ACCOUNTS OF CHEMICAL RESEARCH   Vol. 40 ( 9 ) page: 863 - 873   2007.9

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/ar600034p

    Web of Science

    PubMed

  221. Synthesis of monolithic Al2O3 with well-defined macropores and mesostructured skeletons via the sol-gel process accompanied by phase separation Reviewed

    Tokudome Yasuaki, Fujita Koji, Nakanishi Kazuki, Miura Kiyotaka, Hirao Kazuyuki

    CHEMISTRY OF MATERIALS   Vol. 19 ( 14 ) page: 3393 - 3398   2007.7

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/cm063051p

    Web of Science

  222. New transparent methylsilsesquioxane aerogels and xerogels with improved mechanical properties Reviewed

    Kazuyoshi Kanamori, Mamoru Aizawa, Kazuki Nakanishi, Teiichi Hanada

    ADVANCED MATERIALS   Vol. 19 ( 12 ) page: 1589 - +   2007.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-V C H VERLAG GMBH  

    Transparent organic-inorganic hybrid aerogels and xerogels are prepared by using a sol-gel synthesis from a single trifunctional precursor, methyltrimethoxysilane (see figure). Obtained aerogels show a reversible shrinkage-recovery response against uniaxial compression. Aerogel-like xerogels are successfully obtained by evaporation drying under ambient pressure because the gels recover from the temporal shrinkage caused by the capillary force of a drying solvent. Pore properties and nanotextures are well-preserved in the resultant xerogels.

    DOI: 10.1002/adma.200602457

    Web of Science

    Scopus

    J-GLOBAL

  223. Simple liquid chromatography using monolithic silica rod and capillary Reviewed

    Oi Naobumi, Morisato Kei, Minakuchi Hiroyoshi, Nakanishi Kazuki

    BUNSEKI KAGAKU   Vol. 56 ( 4 ) page: 227 - 229   2007.4

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  224. Temperature-tunable scattering strength based on the phase transition of liquid crystal infiltrated in well-defined macroporous random media Reviewed

    Murai Shunsuke, Fujita Koji, Hirao Takayuki, Nakanishi Kazuki, Hirao Kazuyuki

    OPTICAL MATERIALS   Vol. 29 ( 8 ) page: 949 - 954   2007.4

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.optmat.2005.11.032

    Web of Science

  225. Functional porous materials via sol-gel with phase separation Reviewed

    Kazuki Nakanishi

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   Vol. 115 ( 1339 ) page: 169 - 175   2007.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    Variety of functional porous materials in metal oxide, metalloxane polymer and even pure organic polymer compositions obtained by a sol-gel process are reviewed. Specifically, processes including polymerization-induced phase separation have been extensively introduced from theories to practices. The basic concept of hierarchical pore architecture in monolithic materials is explained, together with several examples of successful applications. Depending on the hierarchy, single, double and triple, unique family of materials can be fabricated. Existing and prospective applications and future challenges of the materials are also shown.

    DOI: 10.2109/jcersj.115.169

    Web of Science

    Scopus

  226. High-throughput protein digestion by trypsin-immobilized monolithic silica with pipette-tip formula Reviewed

    Shigenori Ota, Shota Miyazaki, Hideo Matsuoka, Kei Morisato, Yukihiro Shintani, Kazuki Nakanishi

    JOURNAL OF BIOCHEMICAL AND BIOPHYSICAL METHODS   Vol. 70 ( 1 ) page: 57 - 62   2007.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Based on the monolithic silica gel materials with hierarchical pore structure and on the SPE devices (MonoTip (R)) developed thereof, a trypsin-immobilized monolithic silica in a pipette tip (MonoTip (R) Trypsin) suitable for digesting proteins has been newly developed. The surface of monolithic silica fixed into the tip was chemically modified with trypsin via an aminopropyl group. Trypsin-immobilized monolith successfully performed a rapid digestion of reduced and alkylated proteins with only a few times pipetting operation for the pre-treatment procedure of chromatographic analysis. The novel solid-phase digestion tool using monolithic silica allows a high-throughput trypsin proteolysis of bio-substances in proteomics. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jbbm.2006.10.005

    Web of Science

    Scopus

    PubMed

    J-GLOBAL

  227. Size-exclusion effect and protein repellency of concentrated polymer brushes prepared by surface-initiated living radical polymerization Reviewed

    Yoshikawa Chiaki, Goto Atsushi, Ishizuka Norio, Nakanishi Kazuki, Kishida Akio, Tsujii Yoshinobit, Fukuda Takeshi

    MACROMOLECULAR SYMPOSIA   Vol. 248   page: 189 - 198   2007

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/masy.200750220

    Web of Science

  228. Monolithic TiO2 with controlled multiscale porosity via a template-free sol-gel process accompanied by phase separation Reviewed

    Junko Konishi, Koji Fujita, Kazuki Nakanishi, Kazuyuki Hirao

    CHEMISTRY OF MATERIALS   Vol. 18 ( 25 ) page: 6069 - 6074   2006.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    This article describes the fabrication of multiscale porous nanocrystalline TiO2 monoliths through a one-step method that combines a sol-gel process and phase separation in template-free conditions. A large-dimension monolith with well-defined macropores and a mesostructured anatase-type TiO2 gel skeleton is spontaneously obtained by controlling the solution pH during the hydrolysis and polycondensation reactions of titanium alkoxides. The size of the macropores is adjusted by the starting composition, and a crystallized anatase TiO2 skeleton is formed without heat treatment. The use of titanium alkoxide strengthens the gel network by the formation of chemical bonding in the condensation reaction, which yields porous monoliths with higher mechanical strength than for the case of porous monoliths derived from colloidal TiO2 using freeze drying to maintain the porous morphology. The average crystallite size of anatase TiO2 nanocrystals was found to be about 3.6 nm for the dried gel and about 5.0 nm for the gel calcined at 300 degrees C. As a result of the growth of the anatase TiO2 nanoparticles, the mesopores with a median size of 5.0 nm are obtained. The high surface area (similar to 150 m(2)/g) is maintained even after the heat treatment at 300 degrees C.

    DOI: 10.1021/cm0617485

    Web of Science

    Scopus

  229. New macroporous crosslinked polymer gels prepared via living radical polymerization

    K. Kanamori, K. Nakanishi, T. Hanada

    Materials Research Society Symposium Proceedings   Vol. 947   page: 66 - 71   2006.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Macroporous crosslinked polymer gels have been prepared via TEMPO-mediated living radical polymerization of divinylbenzene (DVB) in a solvent with a counter polymer. Incorporating a counter polymer, poly(dimethylsiloxane) (PDMS), induced macroscopic spinodal-type phase separation during the course of polymerization of DVB while suppressing the segregation of DVB-derived particles from the solution by living polymerization. Well-defined macroporous morphologies comprising continuous DVB-derived skeletons have thus obtained. Macropore volume and diameter were independently controlled by altering the concentrations of PDMS and the solvent. Since the present polymer gels are prepared using only the multifunctional &quot;crosslinker&quot;, mechanical durability against bending and compression was found to be as high as inorganic ceramics with similar morphologies and porosities. © 2007 Materials Research Society.

    Scopus

  230. Performance of monolithic silica capillary columns with increased phase ratios and small-sized domains. Reviewed

    Hara T, Kobayashi H, Ikegami T, Nakanishi K, Tanaka N

    Analytical chemistry   Vol. 78 ( 22 ) page: 7632 - 42   2006.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/ac060770e

    PubMed

  231. Performance of octadecylsilylated monolithic silica capillary columns of 530 mu m inner diameter in HPLC Reviewed

    Motokawa Masanori, Ohira Masayoshi, Minakuchi Hiroyoshi, Nakanishi Kazuk, Tanaka Nobuo

    JOURNAL OF SEPARATION SCIENCE   Vol. 29 ( 16 ) page: 2471 - 2477   2006.11

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/jssc.200600335

    Web of Science

    PubMed

  232. Thick silica gel coatings on methylsilsesquioxane monoliths using anisotropic phase separation Reviewed

    Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi

    JOURNAL OF SEPARATION SCIENCE   Vol. 29 ( 16 ) page: 2463 - 2470   2006.11

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/jssc.200600163

    Web of Science

    PubMed

  233. Living radical polymerization in size-exclusion silica gel column reactors

    Masao Katsube, Makoto Ouchi, Tsuyoshi Ando, Mitsuo Sawamoto, Kazuki Nakanishi, Norio Ishizuka

    Polymer Preprints, Japan   Vol. 55   page: 150   2006.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    This work was aimed to development of continuous-flow living radical polymerization in a silica-gel column, &quot;Chromolith&quot;, focusing its separation function by combination of surface chemical absorption and size-exclusion via uniquely shaped mesopores, Thus, living radical copolymerization of two monomers with different polarities, methyl methacrylate (MMA) and 2(dimethylamino)ethyl methacrylate (DMAEMA) was performed with a catalyst [2; Ru(Ind)Cl(PPh3)2] coupled with an initiator (1). Copolymers were continuously produced, and molecular weight distributions were narrower than that in the corresponding batch process.

    Scopus

  234. Rigid macroporous poly(divinylbenzene) monoliths with a well-defined bicontinuous morphology prepared by living radical polymerization Reviewed

    Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi

    ADVANCED MATERIALS   Vol. 18 ( 18 ) page: 2407 - +   2006.9

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/adma.200601026

    Web of Science

  235. Morphological control and strong light scattering in macroporous TiO2 monoliths prepared via a colloid-derived sol-gel route Reviewed

    Koji Fujita, Junko Konishi, Kazuki Nakanishi, Kazuyuki Hirao

    SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS   Vol. 7 ( 6 ) page: 511 - 518   2006.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:NATL INST MATERIALS SCIENCE  

    Macroporous titania (TiO2) monoliths have been prepared via the sol-gel route started from aqueous anatase-type titania colloid in the presence of poly(ethylene oxide) (PEO), and the light-scattering properties have been investigated by means of coherent backscattering. Well-defined macroporous bicontinuous structures are formed when the transient structure of phase separation is fixed as the permanent morphology by the sol-gel transition. The macroporous morphology, i.e., the size and volume fraction of continuous macropores, can be tailored by adjusting the amount and/or molecular weight of PEO and the TiO2 concentration in the starting solution. During the heat treatment at temperatures above 1000 degrees C, the skeleton is sintered into fully dense body, and the crystalline structure is transformed from anatase to rutile phases, while keeping the macroporous morphology. We show that the rutile-type TiO2-based macroporous monoliths are strongly scattering media for visible light and that the scattering strength can be controlled by the macroporous morphology. (c) 2006 NIMS and Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.stam.2006.04.014

    Web of Science

    Scopus

    J-GLOBAL

  236. Monolithic silica capillary column extraction of methamphetamine and amphetamine in urine coupled with thin-layer chromatographic detection Reviewed

    Akihiro Nakamoto, Akira Namera, Manami Nishida, Mikio Yashiki, Takako Kuramoto, Yoshiyuki Takei, Masahiro Furuno, Hiroyoshi Minakuchi, Kazuki Nakanishi, Kojiro Kimura

    Forensic Toxicology   Vol. 24 ( 2 ) page: 75 - 79   2006.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    A monolithic silica capillary column was first developed in Japan in 2001 as a new tool for better liquid chromatographic separation. The column is made of C18-bonded monolithic silica packed into a capillary glass tube (0.20 mm i.d.). In this study, we used this column for solid-phase extraction of methamphetamine (MA) and amphetamine (AP) in urine. Chromatographic separation was achieved by thin-layer chromatography (TLC) with double-spray detection of each spot. For extraction of amphetamines in urine, samples were mixed with phosphate buffer (pH 3.0, containing 20mM sodium octanesulfate), and the analytes were adsorbed to the column by passing the mixture through it. They were then eluted with a 10-μl volume of ethyl acetate and directly spotted onto a TLC plate. After development, the detection of MA was performed with Simon's reagent. The plate was air-dried, and then over-sprayed with fluorescamine reagent for detection of AP. A fluorescent spot of AP was observed at 365 nm using an ultraviolet viewing system. The detection limits of MA and AP in urine were about 1.0 and 2.0μg/ml, respectively. To confirm the usefulness of this method, the eluent from the column was also analyzed by gas chromatography-mass spectrometry (GC-MS) after derivatization with heptafluorobutyric anhydride. In analysis of 30 actual urine samples, the results obtained by the monolith-TLC system were generally well in accordance with those obtained by GC-MS. © 2006 Japanese Association of Forensic Toxicology and Springer-Verlag Tokyo.

    DOI: 10.1007/s11419-006-0009-z

    Scopus

    J-GLOBAL

    Other Link: http://orcid.org/0000-0002-8069-4780

  237. High-performance liquid chromatographic enantioseparations on capillary columns containing crosslinked polysaccharide phenylcarbamate derivatives attached to monolithic silica Reviewed

    Bezhan Chankvetadze, Takateru Kubota, Tomoyuki Ikai, Chiyo Yamamoto, Masami Kamigaito, Nobuo Tanaka, Kazuki Nakanishi, Yoshio Okamoto

    JOURNAL OF SEPARATION SCIENCE   Vol. 29 ( 13 ) page: 1988 - 1995   2006.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-V C H VERLAG GMBH  

    Monolithic capillary columns containing native silica gel were covalently modified with 3,5-disubstituted phenylcarbamate derivatives of cellulose and amylose and applied for enantioseparations in capillary LC. The method previously used for covalent immobilization of polysaccharide phenylcarbamate derivatives onto the surface of microparticulate silica gel was successfully adapted for in situ modification of monolithic fused-silica capillary columns. The effects of the nature of polysaccharide and the substituents, as well as of multiple covalent immobilization of polysaccharide derivative on chromatographic performance of capillary columns were studied. The capillary columns obtained using this technique are stable in all solvents commonly used in LC and exhibit promising enantiomer resolving ability.

    DOI: 10.1002/jssc.200500388

    Web of Science

    Scopus

    PubMed

  238. Fabrication of Sm2+-doped macroporous aluminosilicate glasses with high alumina content Reviewed

    Takayuki Hirao, Koji Fujita, Shunsuke Murai, Kazuki Nakanishi, Kazuyuki Hirao

    JOURNAL OF NON-CRYSTALLINE SOLIDS   Vol. 352 ( 23-25 ) page: 2553 - 2557   2006.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Macroporous Al2O3-SiO2 glasses doped with Sm2+ have been prepared from a sol-gel system containing aluminum sec-butoxide, tetramethoxysilane, samarium chloride hexahydrate, poly(ethylene oxide), nitric acid, and water. Monolithic gels having interconnected macropores and skeletons are formed by inducing the phase separation parallel to the gelation. The use of aluminum sec-butoxide preheated at 80 degrees C as the starting material enables the incorporation of Al3+ into the gel skeleton up to 20 mol% in cation ratio. The maximum amount of Al3+, i.e., 20 mol%, is twice as large as that reported in our previous study, where aluminum sec-butoxide was diluted with sec-butanol prior to the hydrolysis. Heat-treatment of Sm3+-doped 20AlO(3/2)center dot 80SiO(2) macroporous glass under the reducing atmosphere converts Sm3+ to Sm2+, which is confirmed by the appearance of intense emission peaks attributed to 4f-4f transitions of Sm2+. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jnoncrysol.2006.02.101

    Web of Science

    Scopus

  239. Formation of photonic structures in Sm2+-doped aluminosilicate glasses through phase separation Reviewed

    Koji Fujita, Shunsuke Murai, Kazuki Nakanishi, Kazuyuki Hirao

    JOURNAL OF NON-CRYSTALLINE SOLIDS   Vol. 352 ( 23-25 ) page: 2496 - 2500   2006.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Sm2+-doped Al2O3-SiO2 glasses with three-dimensionally interconnected macroporous morphology have been prepared via the alkoxide-derived sol-gel process containing poly(ethylene oxide) and SmCl3 center dot 6H(2)O. The macroporous morphology is obtained by concurrently inducing the phase separation and sol-gel transition. When the macroporous aluminosilicate glasses doped with Sm2+ are irradiated with a visible light laser at the wavelength of 488 nm, a hole or a dip appears in the plot of fluorescence intensity versus the incident angle of laser beam, indicating that the valence state of Sm2+ is spatially modulated through the interference of multiply scattered light. The hole profile can be controlled by adjusting the macroporous morphology. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jnoncrysol.2006.03.024

    Web of Science

    Scopus

    J-GLOBAL

  240. Anisotropic siloxane-based monolith prepared in confined spaces Reviewed

    Y Suzumura, K Kanamori, K Nakanishi, K Hirao, J Yamamichi

    JOURNAL OF CHROMATOGRAPHY A   Vol. 1119 ( 1-2 ) page: 88 - 94   2006.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    When bicontinuous gels are prepared via sol-gel method in a 2-dimensionally (21)) confined space, the gel skeletons in the vicinity of interface of a mold are elongated perpendicular to the interface. This phenomenon was attributed to the dynamic wetting of polymerizing siloxane phase onto the interface of the mold under gravity. In this paper, we report the successful preparation of monolithic columns with an oriented pillar structure in a variety of 2D confined spaces. Starting from a solution, which consists of methyltrimethoxysilane (MTMS), the macroporous structure is prepared in situ by a completely spontaneous process. In the oriented pillar structure, bicontinuous siloxane skeletons deformed or disappeared and most pillars are oriented along the direction of gravity. Gel morphologies with the pillar structure were examined by scanning electron microscopy (SEM) and laser scanning confocal microscopy (LSCM). Geometrical information on gel morphologies was numerically derived from the obtained 3D LSCM images. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.chroma.2006.02.059

    Web of Science

    Scopus

    PubMed

    J-GLOBAL

  241. Mutual consistency between simulated and measured pressure drops in silica monoliths based on geometrical parameters obtained by three-dimensional laser scanning confocal microscope observations Reviewed

    Haruko Saito, Kazuki Nakanishi, Kazuyuki Hirao, Hiroshi Jinnai

    JOURNAL OF CHROMATOGRAPHY A   Vol. 1119 ( 1-2 ) page: 95 - 104   2006.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    The geometrical properties of co-continuous macroporous silica monoliths have been studied by laser scanning confocal microscopy (LSCM) and a comparison has been made with those obtained by conventional mercury intrusion method. Tetrahedral skeleton model (TMS), which mimics the gel skeleton shape of monoliths, was compared with real monoliths in terms of macropore and porosity using the geometrical parameters extracted from the LSCM observations. Liquid flow behavior through the macroporous silica monoliths was examined in comparison with those simulated using TSM, based on the geometrical properties obtained from LSCM observations. Heterogeneity in macropore topology and connectivity in pores and skeletons are suggested to contribute to the improvement of the model structure for macroporous monoliths. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.chroma.2006.03.087

    Web of Science

    Scopus

    PubMed

    J-GLOBAL

  242. Sol-gel process of oxides accompanied by phase separation Reviewed

    Nakanishi Kazuki

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   Vol. 79 ( 5 ) page: 673 - 691   2006.5

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1246/bcsj.79.673

    Web of Science

  243. High-performance liquid chromatographic enantioseparations on capillary columns containing monolithic silica modified with amylose tris(3,5-dimethylphenylcarbamate) Reviewed

    B Chankvetadze, C Yamamoto, M Kamigaito, N Tanaka, K Nakanishi, Y Okamoto

    JOURNAL OF CHROMATOGRAPHY A   Vol. 1110 ( 1-2 ) page: 46 - 52   2006.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Monolithic capillary columns containing native silica were modified by in situ coating with amylose tris(3,5-dimethylphenylcarbamate) and applied for enantioseparations in capillary liquid chromatography. Capillary columns were examined for 10 standard racemic compounds in order to compare the performance of monolithic silica columns with the common, 4.6 mm I.D. high-performance liquid chromatographic columns packed with particulate silica. The effects of polysaccharide coating and of the linear velocity of the mobile phase on peak performance were studied. Enantioseparations with an analysis time below 1 min were achieved for some chiral analytes. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.chroma.2006.01.076

    Web of Science

    Scopus

    PubMed

    J-GLOBAL

  244. Phase-separation-induced Titania monoliths with well-derined macropores and mesostructured framework from colloid-derived sol-gel systems Reviewed

    Konishi J, Fujita K, Nakanishi K, Hirao K

    CHEMISTRY OF MATERIALS   Vol. 18 ( 4 ) page: 864 - 866   2006.2

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/cm052155h

    Web of Science

  245. Direct observation of the spatial distribution of samarium ions in alumina-silica macroporous monoliths by laser scanning confocal microscopy Reviewed

    S Murai, K Fujita, K Nakanishi, K Hirao

    JOURNAL OF ALLOYS AND COMPOUNDS   Vol. 408   page: 831 - 834   2006.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE SA  

    We have investigated the spatial distribution of Sm2+ inside macroporous alumina-silica (Al2O3-SiO2) glasses having three-dimensionally interconnected skeletons. The Sm2+-doped Al2O3-SiO2 glasses are prepared via an alkoxy-derived sol-gel route in the presence of poly (ethylene oxide) and SmCl3.6H(2)O. The well-defined macroporous morphology is obtained by the concurrence of the phase separation and the sol-gel transition. The reduction of Sm3+ to Sm2+ is accomplished by heat treatment under a reducing atmosphere. Two-dimensional images of the fluorescence due to the 4f-4f transition of Sm2+ with the aid of a laser scanning confocal microscope reveal the spatially uniform dispersion Of Sm2+ inside the Al2O3-SiO2 skeleton. (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jallcom.2005.01.085

    Web of Science

    Scopus

    J-GLOBAL

  246. Basic study of the gelation of dimethacrylate-type crosslinking agents Reviewed

    H Aoki, K Hosoya, T Norisuye, N Tanaka, D Tokuda, N Ishizuka, K Nakanishi

    JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY   Vol. 44 ( 2 ) page: 949 - 958   2006.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JOHN WILEY & SONS INC  

    An investigation was made of the gelation of dimethacrylate-type crosslinking agents in view of an application for separation media. The study mainly centered on a crosslinking agent, glycerol dimethaerylate (GDMA), which is relatively hydrophilic because of a hydroxyl group in the middle of its structure. The gelation of GDMA was compared with that of other hydrophobic crosslinking agents such as ethylene glycol dimethacrylate and 1,6-hexanediol dimethacrylate. The diluents used in the study were toluene, toluene with methanol, and cyclohexanol. The gelation was observed in real time with a charge coupled device camera and dynamic light scattering (DLS). Also, the separated dry gels were extensively characterized with scanning electron microscopy, BET (N-2 absorption and desorption isotherm), and Fourier transform infrared. DLS analysis showed a stronger molecular interaction of GDMA gelation in toluene, whereas this interaction was much weaker in an alcoholic solvent such as toluene with methanol or cyclohexanol. This indicated that GDMA gelation might proceed through hydrogen bonding as well as a crosslinking reaction of vinyl groups. (c) 2005 Wiley Periodicals, Inc.

    DOI: 10.1002/pola.21205

    Web of Science

    Scopus

    J-GLOBAL

  247. Size exclusion chromatography of standard polystyrenes with a wide range of molecular weight up to 7.45 x 10(6) on monolithic silica capillary columns Reviewed

    Ute Koichi, Yoshida Saori, Kitayama Tatsuki, Bamba Takeshi, Harada Kazuo, Fukusaki Eiichiro, Kobayashi Akio, Ishizuka Norio, Minakuchi Hiroyoshi, Nakanishi Kazuki

    POLYMER JOURNAL   Vol. 38 ( 11 ) page: 1194 - 1197   2006

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1295/polymj.PJ2006079

    Web of Science

  248. Porous methylsiloxane gel thick film for millimeter-wave antenna substrate prepared by gap filling method Reviewed

    Tanaka Takeharu, Kawakami Nobuyuki, Hirano Takayuki, Fukumoto Yoshito, Suzuki Tetsuo, Kanamori Kazuyoshi, Nakanishi Kazuki

    MATERIAL AND DEVICES FOR SMART SYSTEMS II   Vol. 888   page: 251 - +   2006

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Web of Science

  249. Control of light scattering in organic-inorganic hybrid macroporous monoliths

    Takayuki Hirao, Shunsuke Murai, Koji Fujita, Kazuki Nakanishi, Kazuyuki Hirao

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   Vol. 52 ( 10 ) page: 781 - 785   2005.10

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    The tuning of light scattering strength has been demonstrated for organic-inorganic hybrid monoliths with well-defined through-pores in micrometer range. Macroporous gels having interconnected pores and skeletons are obtained in a system containing methyltrimethoxysilane, water, nitric acid, and methanol using an alkoxy-derived sol-gel method combined with the phase separation. The sizes of pores and skeletons can be controlled by varying molar ratios of water and methanol in the starting compositions which mostly affect the onset of polymerization-induced phase separation in the system. The mercury porosimetry shows that the resultant gels have a sharp pore size distribution, and the average pore diameter increases with increasing the amount of water and methanol. The coherent backscattering measured for the gels formed in between two slide glasses reveals that the transport mean free path of light decreases with decreasing the sizes of pores and skeletons. Pore size dependence of the scattering strength can be qualitatively explained by a Mie scattering calculation using a model in which spherical pores are randomly distributed in methylsiloxane matrix. The results indicate that the scattering strength can be tuned by controlling the sizes of the pores.

    DOI: 10.2497/jjspm.52.781

    Scopus

  250. An application of silica-based monolithic membrane emulsification technique for easy and efficient preparation of uniformly sized polymer particles Reviewed

    K Hosoya, M Bendo, N Tanaka, Y Watabe, T Ikegami, H Minakuchi, K Nakanishi

    MACROMOLECULAR MATERIALS AND ENGINEERING   Vol. 290 ( 8 ) page: 753 - 758   2005.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-V C H VERLAG GMBH  

    Uniformly sized polymer particles were prepared by an emulsification and polymerization technique utilizing a silica monolithic membrane, namely the "silica monolithic membrane emulsification technique". In this paper, we utilized silica monolithic membrane as a device for the preparation of uniformly sized polymer particles. A mixture of monomers, diluents and oil-soluble initiator was emulsified into a continuous medium through the silica monolithic membrane and polymerized. The particles obtained had a higher size uniformity than that of particles prepared by previously reported membrane emulsification techniques, such as the Shirasu Porous Glass (SPG) emulsification technique. Through the silica monolithic membrane emulsification technique, we could prepare particles having availability as a possible packing material for solid-phase extraction (SPE) and high performance liquid chromatography (HPLC).

    DOI: 10.1002/mame.200500006

    Web of Science

    Scopus

    J-GLOBAL

  251. Experimental validation of the tetrahedral skeleton model pressure drop correlation for silica monoliths and the influence of column heterogeneity Reviewed

    N Vervoort, H Saito, K Nakanishi, G Desmet

    ANALYTICAL CHEMISTRY   Vol. 77 ( 13 ) page: 3986 - 3992   2005.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    This paper describes the use of computational fluid dynamics for the calculation of the flow resistance through computer-generated models resembling silica monoliths. This study was undertaken to determine the effect of skeleton heterogeneity on the flow resistance and, more precisely, to test the hypothesis that increased skeleton heterogeneity decreases the flow resistance. To evaluate the proposed model, 24 real silica monoliths have been prepared using the same method, covering a wide range of skeleton sizes (2.2 mu m &lt; d(s) &lt; 8 mu m) and porosities (0.47 &lt; epsilon &lt; 0.66). The permeability of these monoliths was determined by pressure drop measurements, and structural information was obtained by image analysis of laser scanning confocal microscopy-generated 3D images of the skeleton structure. The results indicate that the presence of preferential flow paths due to an increased heterogeneity of the flow through pore space reduces the flow resistance of monolithic media. It is also shown that the pore size is hence a much better suited scaling dimension than the skeleton size to reduce the permeability of monolithic columns.

    DOI: 10.1021/ac0502798

    Web of Science

    Scopus

    PubMed

    J-GLOBAL

  252. Silica monolithic membrane as separation medium - Summable property of different membranes for high-performance liquid chromatographic separation Reviewed

    Hosoya K, Ogata T, Watabe Y, Kubo T, Ikegami T, Tanaka N, Minakuchi H, Nakanishi K

    JOURNAL OF CHROMATOGRAPHY A   Vol. 1073 ( 1-2 ) page: 123 - 126   2005.5

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.chroma.2004.09.042

    Web of Science

    PubMed

  253. Monolithic periodic mesoporous silica with well-defined macropores Reviewed

    T Amatani, K Nakanishi, K Hirao, T Kodaira

    CHEMISTRY OF MATERIALS   Vol. 17 ( 8 ) page: 2114 - 2119   2005.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    Monolithic pure silica gels with hierarchical macro-mesoporous structure have been synthesized via a spontaneous sol-gel process from silicon alkoxide using a structure-directing agent and a micelle-swelling agent. A monolithic body with well-defined co-continuous macropores is a result of concurrent phase separation and sol-gel transition induced by the polymerization reaction, whereas the mesopores are templated by the cooperative self-assembly of inorganic species, a structure-directing agent, and a micelle-swelling agent. These bimodal pore systems are formed spontaneously in a closed condition at a constant temperature. The following removal of surfactants by heat-treatment gives silica gels with hierarchical and fully accessible pores in discrete size ranges of micrometers and nanometers. The highly ordered 2D-hexagonal arrays of mesopores have been confirmed by X-ray diffraction measurements and FE-SEM observations. Furthermore, by further additions of the micelle-swelling agent, the mesostructural transition from well-ordered 2D-hexagonal arrays to mesostructured cellular foams (MCF) has been induced accompanied by minor modifications of the micrometer-range structure.

    DOI: 10.1021/cm048091c

    Web of Science

    Scopus

    J-GLOBAL

  254. High-performance frontal analysis of the binding of thyroxine enantiomers to human serum albumin Reviewed

    Kimura T, Nakanishi K, Nakagawa T, Shibukawa A, Matsuzaki K

    PHARMACEUTICAL RESEARCH   Vol. 22 ( 4 ) page: 667 - 675   2005.4

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s11095-005-2485-y

    Web of Science

  255. Recent advances in the design of monolithic silica columns: From small to big dimensions. Reviewed

    Cabrera K, Kraus A, Minakuchi H, Nakanishi K

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   Vol. 229   page: U144 - U144   2005.3

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  256. Insight on structural change in sol-gel-derived silica gel with aging under basic conditions for mesopore control Reviewed

    R Takahashi, K Nakanishi, N Soga

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 33 ( 2 ) page: 159 - 167   2005.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER  

    Structural rearrangement of sol-gel-derived silica gel by aging under basic conditions was investigated using small angle X-ray scattering (SAXS) and Si-29 nuclear magnetic resonance (NMR). A wet silica gel prepared under acidic conditions had a fractal nature, and many unreacted silanols remained on the surface. During aging of the gel in ammonia solution, additional Si-O-Si bonds rapidly formed, whereas the change in mesoscale structure gradually proceeded. This result was compared with that of simulation modeling the Ostwald ripening, i.e. dissolution from positive curvature and reprecipitation on negative curvature. In the simulation, structural change in a cluster from fractal nature to particle aggregates was well visualized in 2-dimmensional square lattice. Both scattering profiles calculated from the model clusters and the change in average coordination number of monomers in the cluster well agreed with the experimental SAXS and NMR results, respectively. This agreement strongly ensures us that structural change by aging under basic conditions proceeds through the Ostwald ripening. The mesopore size as well as mesopore volume in calcined silica gel is determined by the shrinkage degree during drying and calcination. The sample aged in basic solution restrains the shrinkage because of the growth of particulate structure, and retains large size and volume of pores.

    DOI: 10.1007/s10971-005-5610-9

    Web of Science

    Scopus

    J-GLOBAL

  257. Titania-coated monolithic silica as separation medium for high performance liquid chromatography of phosphorus-containing compounds Reviewed

    Miyazaki S, Miah MY, Morisato K, Shintani Y, Kuroha T, Nakanishi K

    JOURNAL OF SEPARATION SCIENCE   Vol. 28 ( 1 ) page: 39 - 44   2005.1

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/jssc.200401932

    Web of Science

    PubMed

  258. Formation of photonic structures inSM(2+)-doped aluminosilicate glasses through phase separation Reviewed

    K Fujita, S Murai, K Nakanishi, K Hirao

    Micromachining Technology for Micro-Optics and Nano-Optics III   Vol. 5720   page: 261 - 268   2005

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:SPIE-INT SOC OPTICAL ENGINEERING  

    Sm2+-doped Al2O3-SiO2 glasses with three-dimensionally interconnected macroporous morphology have been prepared via the alkoxy,-derived sol-gel process containing poly (ethylene oxide) and SmCl3 center dot 6H(2)O. The macroporous morphology . is obtained by cconcurrently inducing the phase separation and sol-gel transition. Using a visible laser with the wavelength of 488 nm, the valence State Of Sm2+ has been manipulated spatially, When the photoionization Of Sm2+ is combined with multiple light scattering in the porous glasses, holes are burned in wave-vector domain. The hole profile can be controlled by adjusting the macroporous morphology.

    DOI: 10.1117/12.590712

    Web of Science

    Scopus

  259. Topical application of ionic polymers affects skin permeability barrier homeostasis Reviewed

    Denda M, Nakanishi K, Kumazawa N

    SKIN PHARMACOLOGY AND PHYSIOLOGY   Vol. 18 ( 1 ) page: 36 - 41   2005

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1159/000081684

    Web of Science

  260. Fabrication of macroporous TiO2 monoliths for photonic applications Reviewed

    J Konishi, K Fujita, K Nakanishi, K Hirao

    Micromachining Technology for Micro-Optics and Nano-Optics III   Vol. 5720   page: 233 - 240   2005

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:SPIE-INT SOC OPTICAL ENGINEERING  

    Macroporous titania (TiO2) monoliths have been prepared by the sol-gel method including phase separation., and the light-scattering properties have been investigated by means of coherent backscattering. Macroporous TiO2 gels are obtained g a in the systems containing aqueous titania colloid and poly(ethylene oxide)(PEO). Three-dimensionally interconnected macroporous structure is formed when the transient structure of phase separation is fixed as the permanent morphology by the sol-gel transition. The domain size of macroporous TiO2 gels can be controlled reproducibly by adjusting the concentration of PEO. During the heat treatment above 1000 degrees C, the TiO2 skeleton is sintered into fully dense body and the crystalline structure is transformed from anatase to rutile, while maintaining macroporous morphology. We show that the rutile-type TiO2 -based macroporous monoliths are strongly scattering media for visible light.

    DOI: 10.1117/12.591059

    Web of Science

    Scopus

  261. Monolithic O/I-hybrids with hierarchically ordered meso- and macropores Reviewed

    K Nakanishi, Y Kobayashi, T Amatani, K Hirao, T Kodaira

    ORGANIC/INORGANIC HYBRID MATERIALS-2004   Vol. 847   page: 147 - 157   2005

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:MATERIALS RESEARCH SOCIETY  

    Organic-Inorganic hybrid gels with hierarchical well-defined macropores and supramolecularly templated mesopores with long-range orders have been synthesized in the systems of bridged poly(silsesquioxane) systems. Nonionic surfactants such as poly(ethyleneglycol)-poly(propyleneglycol)-poly(ethyleneglycol) triblock copolymers, EOPOEOs, were found to be effective both in inducing the phase separation to give macroporous morphology and in templating the mesopores with narrow size distribution. The number of methylene units in the bridge, changed from I to 6 in the present experiments, affected both the phase separation tendency and template strength. In the system containing 1,2-bis(trimethoxysilyl)ethane, 2D-hexagonal arrangement of mesopores have been prepared in the gel skeleton comprising the well-defined continuous macroporous network with an aid of micelle-stabilizing agent.

    Web of Science

  262. Hierarchical macro-mesoporous silica monolith Reviewed

    T Amatani, K Nakanishi, K Hirao, T Kodaira

    Organic/Inorganic Hybrid Materials-2004   Vol. 847   page: 121 - 126   2005

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:MATERIALS RESEARCH SOCIETY  

    Monolithic pure silica gels with hierarchical macro-mesoporous structure have been synthesized via spontaneous sol-gel process from silicon alkoxide using a structure-directing agent and a micelle-swelling agent. Monolithic body with well-defined co-continuous macropores is a result of concurrent phase separation and sol-gel transition induced by the polymerization reaction, whereas the mesopores are templated by the cooperative self-assembly of inorganic species, a structure-directing agent and a micelle-swelling agent. The following removal of surfactants by heat-treatment gives silica gels with hierarchical and fully accessible pores in discrete size ranges of micrometers and nanometers. The highly ordered 2D-hexagonal arrays of mesopores have been confirmed by X-ray diffraction measurements and FE-SEM observations. Furthermore, by further additions of the micelle-swelling agent, the mesostructural transition from well-ordered 2D-hexagonal arrays to mesostructured cellular foams (MCF) have been induced accompanied by minor modifications of the micrometer-range structure.

    Web of Science

  263. Organic-inorganic hybrid poly(silsesquioxane) monoliths with controlled macro- and mesopores Reviewed

    K Nakanishi, K Kanamori

    JOURNAL OF MATERIALS CHEMISTRY   Vol. 15 ( 35-36 ) page: 3776 - 3786   2005

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    Siloxane-based organic-inorganic hybrid monoliths with well-defined macropores and/or mesopores have been synthesized by a sol-gel process, accompanied by polymerization-induced phase separation. Using aklyltrialkoxysilanes and alkylene-bridged alkoxysilanes, two different categories of organosiloxane networks have been characterized in view of macroporosity (based on phase separation) and mesoporosity (supramolecularly templated by surfactants). While the alkyl-terminated poly(siloxane) networks exhibit substantial surface hydrophobicity accompanied by mechanical flexibility, the alkylene-bridged networks behave much more similarly to those prepared from tetraalkoxysilanes with regard to surface hydrophilicity, mechanical rigidness and mesopore-forming ability. The supramolecular templating of mesopores embedded in the gel skeletons (which comprise well-defined macroporous networks) has proven to give a wide variety of hierarchically-designed macro-mesoporous hybrid materials.

    DOI: 10.1039/b508415f

    Web of Science

    Scopus

    J-GLOBAL

  264. Three dimensional structure and liquid transport behavior of siloxane gels with co-continuous macropores Reviewed

    Saito H, Nakanishi K, Hirao K, Jinnai H, Morisato K, Minakuchi H

    ORGANIC/INORGANIC HYBRID MATERIALS-2004   Vol. 847   page: 203 - 208   2005

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Web of Science

  265. Living radical polymerization in ruthenium-bearing size-exclusion silica gel column reactors Reviewed

    M. Katsube, T. Ando, M. Ouchi, M. Sawamoto, K. Nakanishi, N. Ishizuka

    Polymer Preprints, Japan   Vol. 54 ( 2 ) page: 2491-   2005

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  266. Strong light scattering in macroporous TiO2 monoliths induced by phase separation Reviewed

    Fujita K, Konishi J, Nakanishi K, Hirao K

    APPLIED PHYSICS LETTERS   Vol. 85 ( 23 ) page: 5595 - 5597   2004.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/1.1823596

    Web of Science

  267. Morphology control of phase-separation-induced alumina-silica macroporous gels for rare-earth-doped scattering media Reviewed

    Murai S, Fujita K, Nakanishi K, Hirao K

    JOURNAL OF PHYSICAL CHEMISTRY B   Vol. 108 ( 43 ) page: 16670 - 16676   2004.10

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/jp0481658

    Web of Science

  268. Fabrication of dye-infiltrated macroporous silica for laser amplification Reviewed

    Murai S, Fujita K, Nakanishi K, Hirao K

    JOURNAL OF NON-CRYSTALLINE SOLIDS   Vol. 345   page: 438 - 442   2004.10

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.jnoncrysol.2004.08.059

    Web of Science

  269. Spontaneous formation of hierarchical macro-mesoporous ethane-silica monolith Reviewed

    Nakanishi K, Kobayashi Y, Amatani T, Hirao K, Kodaira T

    CHEMISTRY OF MATERIALS   Vol. 16 ( 19 ) page: 3652 - 3658   2004.9

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/cm049320y

    Web of Science

  270. Formation of interconnected macropores in Sm2+-doped silicate glasses through phase separation: Fabrication of photosensitive and dielectrically disordered materials

    Fujita K, Murai S, Ohashi Y, Nakanishi K, Hirao K

    CHEMISTRY LETTERS   Vol. 33 ( 9 ) page: 1120-1121   2004.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Web of Science

  271. Formation of interconnected macropores in Sm<sup>2+</sup>-doped silicate glasses through phase separation: Fabrication of photosensitive and dielectrically disordered materials

    Fujita K.

    Chemistry Letters   Vol. 33 ( 9 ) page: 1120-1121   2004.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1246/cl.2004.1120

    Scopus

  272. Tailoring photonic strength in monolithic macroporous silica for random media Reviewed

    Murai S, Fujita K, Nakanishi K, Hirao K

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS   Vol. 43 ( 8A ) page: 5359 - 5364   2004.8

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1143/JJAP.43.5359

    Web of Science

  273. Development of a monolithic silica extraction tip for the analysis of proteins Reviewed

    S Miyazaki, K Morisato, N Ishizuka, H Minakuchi, Y Shintani, M Furuno, K Nakanishi

    JOURNAL OF CHROMATOGRAPHY A   Vol. 1043 ( 1 ) page: 19 - 25   2004.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    In proteomics, pre-treatment of sample is the most important procedure to remove the matrix for interfacing with mass spectrometry (XIS). Additionally, for the samples with low concentration, the process of pre-concentration is required before MS analysis. We have newly developed solid-phase extraction (SPE) tool with pipette-tip shape for purification of bio-samples of various characteristics, utilizing monolithic silica gel as medium. The monolithic silica surface was modified with a C-18 phase or coated with titania phase. A C-18-bonded tip and a non-modified tip were used for sample concentration, desaltination and removal of detergents from sample. A titania-coated tip was also applied for purification and concentration of phosphorylated peptides. This novel pre-treatment method using monolithic silica extraction tip is much effective and suitable for protein analysis. (C) 2004 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.chroma.2004.03.025

    Web of Science

    PubMed

    J-GLOBAL

  274. High-performance liquid chromatographic enantioseparations on capillary columns containing monolithic Reviewed

    Chankvetadze B, Yamamoto C, Tanaka N, Nakanishi K, Okamoto Y

    JOURNAL OF SEPARATION SCIENCE   Vol. 27 ( 10-11 ) page: 905 - 911   2004.7

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/jssc.200401819

    Web of Science

    PubMed

  275. Simple 2D-HPLC using a monolithic silica column for peptide separation Reviewed

    Kimura H, Tanigawa T, Morisaka H, Ikegami T, Hosoya K, Ishizuka N, Minakuchi H, Nakanishi K, Ueda M, Cabrera K, Tanaka N

    JOURNAL OF SEPARATION SCIENCE   Vol. 27 ( 10-11 ) page: 897 - 904   2004.7

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/jssc.200401842

    Web of Science

    PubMed

  276. Structural formation of hybrid siloxane-based polymer monolith in confined spaces. Reviewed

    Kanamori K, Yonezawa H, Nakanishi K, Hirao K, Jinnai H

    Journal of separation science   Vol. 27 ( 10-11 ) page: 874 - 86   2004.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/jssc.200401816

    PubMed

  277. Simple and comprehensive two-dimensional reversed-phase HPLC using monolithic silica columns Reviewed

    Tanaka N, Kimura H, Tokuda D, Hosoya K, Ikegami T, Ishizuka N, Minakuchi H, Nakanishi K, Shintani Y, Furuno M, Cabrera K

    ANALYTICAL CHEMISTRY   Vol. 76 ( 5 ) page: 1273 - 1281   2004.3

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/ac034925j

    Web of Science

    PubMed

  278. Controlled hierarchical pore structures in ethylene-bridged polysilsesquioxane gels Reviewed

    Y Kobayashi, K Nakanishi, K Hirao

    CONTINUOUS NANOPHASE AND NANOSTRUCTURED MATERIALS   Vol. 788   page: 353 - 358   2004

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:MATERIALS RESEARCH SOCIETY  

    Formation of hierarchical macropores and mesopores in ethylene-bridged polysilsesquioxane sol-gel systems via concurrent sol-gel transition and phase separation induced by the incorporation of supramolecular templats has been investigated. A series of poly(ethyleneglycol)-poly(propyleneglycol)- poly(ethyleneglycol) triblock copolymers, EOPOEOs, have been employed as supramolecular templates, while 1,2-bis(trimethoxysilyl)ethane was used as a polysilsesquioxane source. Successful combination of templated mesopores and well-defined macropores due to phase-separation has been found in the system with EOPOEOs having 70 PO units and respective 20 EO units. Although similar macroporous morphology has been obtained for all the EOPOEOs with EO chain longer or shorter than 20 units, the optimum composition for the co-continuous macropores and that for templated mesopores deviated from each other, resulting in the failure of producing hierarchical macropores and mesopores.

    Web of Science

  279. Macroporous silica and alkylene-bridged polysilsesquioxane gels with templated nanopores Reviewed

    Nakanishi K

    CONTINUOUS NANOPHASE AND NANOSTRUCTURED MATERIALS   Vol. 788   page: 337 - 346   2004

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  280. Macroporous morphology induced by phase separation in sol-gel systems derived from titania colloid Reviewed

    Konishi J, Fujita K, Nakanishi K, Hirao K

    CONTINUOUS NANOPHASE AND NANOSTRUCTURED MATERIALS   Vol. 788   page: 391 - 396   2004

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Web of Science

  281. Development of a parallel HPLC system using monolithic silica capillary columns connected with chips

    Daisuke Tokuda, Tohru Ikegami, Ken Hosoya, Yukihiro Shintani, Masahiro Furuno, Norio Ishizuka, Hiroyoshi Minakuchi, Kazuki Nakanishi, Nobuo Tanaka

    Chromatography   Vol. 25   page: 17 - 18   2004

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  282. Monolithic silica-based capillary reversed-phase liquid chromatography/electrospray mass spectrometry for plant metabolomics Reviewed

    Tolstikov VV, Lommen A, Nakanishi K, Tanaka N, Fiehn O

    ANALYTICAL CHEMISTRY   Vol. 75 ( 23 ) page: 6737 - 6740   2003.12

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/ac034716z

    Web of Science

    PubMed

  283. Monolithic silica columns with chemically bonded beta-cyclodextrin as a stationary phase for enantiomer separations of chiral pharmaceuticals Reviewed

    Lubda D, Cabrera K, Nakanishi K, Lindner W

    ANALYTICAL AND BIOANALYTICAL CHEMISTRY   Vol. 377 ( 5 ) page: 892 - 901   2003.11

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s00216-003-2181-x

    Web of Science

  284. Bonelike apatite formation on ethylene-vinyl alcohol copolymer modified with silane coupling agent and calcium silicate solutions Reviewed

    A Oyane, M Kawashita, K Nakanishi, T Kokubo, M Minoda, T Miyamoto, T Nakamura

    BIOMATERIALS   Vol. 24 ( 10 ) page: 1729 - 1735   2003.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCI LTD  

    An ethylene-vinyl alcohol copolymer (EVOH) was treated with a silane coupling agent and calcium silicate solutions, and then soaked in a simulated body fluid (SBF) with ion concentrations approximately equal to those of human blood plasma. A smooth and uniform bonelike apatite layer was successfully formed on both the EVOH plate and the EVOH-knitted fibers in SBF within 2 days. Part of the structure of the resulting apatite-EVOH fiber composite was similar to that of natural bone. If this kind of composite can be fabricated into a three-dimensional structure similar to natural bone, the resultant composite is expected to exhibit both mechanical properties analogous to those of natural bone and bone-bonding ability. Hence, it has great potential as a bone substitute. (C) 2003 Elsevier Science Ltd. All rights reserved.

    DOI: 10.1016/S0142-9612(02)00581-1

    Web of Science

    Scopus

    PubMed

    J-GLOBAL

  285. Monolithic silica column for in-tube solid-phase microextraction coupled to high-performance liquid chromatography Reviewed

    Shintani Y, Zhou X, Furuno M, Minakuchi H, Nakanishi K

    JOURNAL OF CHROMATOGRAPHY A   Vol. 985 ( 1-2 ) page: 351 - 357   2003.1

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Web of Science

  286. Monolithic silica column for in-tube solid-phase microextraction coupled to high-performance liquid chromatography. Reviewed

    Shintani Y, Zhou X, Furuno M, Minakuchi H, Nakanishi K

    Journal of chromatography. A   Vol. 985 ( 1-2 ) page: 351 - 7   2003.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/s0021-9673(02)01447-4

    PubMed

  287. Phase separation in sol-gel system containing mixture of 3-and 4-functional alkoxysilanes Reviewed

    Itagaki A, Nakanishi K, Hirao K

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 26 ( 1-3 ) page: 153 - 156   2003.1

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  288. Supramolecular templating of mesopores in phase-separating silica sol-gels incorporated with cationic surfactant Reviewed

    Nakanishi K, Sato Y, Ruyat Y, Hirao K

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 26 ( 1-3 ) page: 567 - 570   2003.1

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  289. Controlled hierarchical pore structures in ethylene-bridged polysilsesquioxane gels Reviewed

    Kobayashi Y., Nakanishi K., Hirao K.

    Materials Research Society Symposium - Proceedings   Vol. 788   page: 353 - 358   2003

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Materials Research Society Symposium - Proceedings  

    Formation of hierarchical macropores and mesopores in ethylene-bridged polysilsesquioxane sol-gel systems via concurrent sol-gel transition and phase separation induced by the incorporation of supramolecular templats has been investigated. A series of poly(ethyleneglycol)-poly(propyleneglycol)- poly(ethyleneglycol) triblock copolymers, EOPOEOs, have been employed as supramolecular templates, while 1,2-bis(trimethoxysilyl)ethane was used as a polysilsesquioxane source. Successful combination of templated mesopores and well-defined macropores due to phase-separation has been found in the system with EOPOEOs having 70 PO units and respective 20 EO units. Although similar macroporous morphology has been obtained for all the EOPOEOs with EO chain longer or shorter than 20 units, die optimum composition for the co-continuous macropores and that for templated mesopores deviated from each other, resulting in the failure of producing hierarchical macropores and mesopores.

    DOI: 10.1557/proc-788-ll3.10

    Scopus

  290. Monolithic silica columns for high-efficiency chromatographic separations Reviewed

    Tanaka N, Kobayashi H, Ishizuka N, Minakuchi H, Nakanishi K, Hosoya K, Ikegami T

    JOURNAL OF CHROMATOGRAPHY A   Vol. 965 ( 1-2 ) page: 35 - 49   2002.8

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  291. Monolithic silica columns for high-efficiency chromatographic separations. Reviewed

    Tanak N, Kobayashi H, Ishizuka N, Minakuchi H, Nakanishi K, Hosoya K, Ikegami T

    Journal of chromatography. A   Vol. 965 ( 1-2 ) page: 35 - 49   2002.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/s0021-9673(01)01582-5

    PubMed

  292. Monolithic silica columns with various skeleton sizes and through-pore sizes for capillary liquid chromatography Reviewed

    Motokawa M, Kobayashi H, Ishizuka N, Minakuchi H, Nakanishi K, Jinnai H, Hosoya K, Ikegami T, Tanaka N

    JOURNAL OF CHROMATOGRAPHY A   Vol. 961 ( 1 ) page: 53 - 63   2002.6

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Web of Science

  293. Monolithic silica columns with various skeleton sizes and through-pore sizes for capillary liquid chromatography. Reviewed

    Motokawa M, Kobayashi H, Ishizuka N, Minakuchi H, Nakanishi K, Jinnai H, Hosoya K, Ikegami T, Tanaka N

    Journal of chromatography. A   Vol. 961 ( 1 ) page: 53 - 63   2002.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/s0021-9673(02)00133-4

    PubMed

  294. Monolithic silica columns for high-efficiency separations by high-performance liquid chromatography Reviewed

    Ishizuka N, Kobayashi H, Minakuchi H, Nakanishi K, Hirao K, Hosoya K, Ikegami T, Tanaka N

    JOURNAL OF CHROMATOGRAPHY A   Vol. 960 ( 1-2 ) page: 85 - 96   2002.6

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  295. Monolithic silica columns for high-efficiency separations by high-performance liquid chromatography. Reviewed

    Ishizuka N, Kobayashi H, Minakuchi H, Nakanishi K, Hirao K, Hosoya K, Ikegami T, Tanaka N

    Journal of chromatography. A   Vol. 960 ( 1-2 ) page: 85 - 96   2002.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/s0021-9673(01)01580-1

    PubMed

  296. Monolithic HPLC silica columns Reviewed

    Lubda D, Cabrera K, Nakanishi K, Minakuchi H

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 23 ( 2 ) page: 185 - 187   2002.2

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  297. Phase separation in alkylene-bridged polysilsesquioxane sol-gel systems Reviewed

    Nakanishi K, Yamato T, Hirao K

    ORGANIC/INORGANIC HYBRID MATERIALS-2002   Vol. 726   page: 291 - 296   2002

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  298. Phase separation in sol-gel process of alkoxide-derived silica-zirconia in the presence of polyethylene oxide Reviewed

    Takahashi R, Sato S, Sodesawa T, Suzuki K, Tafu M, Nakanishi K, Soga N

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   Vol. 84 ( 9 ) page: 1968 - 1976   2001.9

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Web of Science

  299. Chromatographic characterization of macroporous monolithic silica prepared via sol-gel process Reviewed

    N Ishizuka, H Minakuchi, K Nakanishi, K Hirao, N Tanaka

    COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   Vol. 187   page: 273 - 279   2001.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    A continuous porous silica monolith prepared by the sol-gel process including phase separation was aged in a basic solvent making use of hydrolysis of urea to prepare extended mesopore structures for chromatographic applications. The dissolution-reprecipitation kinetics at the interfaces between wet gel skeletons and an external solvent affected the size and volume of pores formed within the skeletons. At above 200 degreesC, the pore size attained the macropore dimensions ( &gt; 50 nm). The results of chromatography indicate that the monolithic silica column with wide mesopore could reduce the separation time compared to the conventional column packed with 5 mum silica particle. (C) 2001 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0927-7757(01)00642-2

    Web of Science

    Scopus

    J-GLOBAL

  300. Monolithic LC columns Reviewed

    Tanaka N, Kobayashi H, Nakanishi K, Minakuchi H, Ishizuka N

    ANALYTICAL CHEMISTRY   Vol. 73 ( 15 ) page: 420A - 429A   2001.8

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  301. About the total performance of monolithic HPLC-columns. Reviewed

    K Cabrera, H Minakuchi, D Lubda, K Nakanishi

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   Vol. 221   page: U100 - U100   2001.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    Web of Science

  302. Three-dimensional structure of a sintered macroporous silica gel Reviewed

    Jinnai H, Nakanishi K, Nishikawa Y, Yamanaka J, Hashimoto T

    LANGMUIR   Vol. 17 ( 3 ) page: 619 - 625   2001.2

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/la000949z

    Web of Science

  303. Macroporous morphology of titania films prepared by sol-gel dip-coating method from a system containing poly(ethylene glycol) and poly(vinylpyrrolidone) Reviewed

    Kajihara K, Nakanishi K

    JOURNAL OF MATERIALS RESEARCH   Vol. 16 ( 1 ) page: 58 - 66   2001.1

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Web of Science

  304. Apatite formation on ethylene-vinyl alcohol copolymer modified with silane coupling agent and calcium silicate Reviewed

    Oyane A., Minoda M., Miyamoto T., Nakanishi K., Kawashita M., Kokubo T., Nakamura T.

    Key Engineering Materials   Vol. 192-195   page: 713 - 716   2001

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Key Engineering Materials  

    Silanol (Si-OH) groups on materials are believed to induce the apatite nucleation in the body environment. In the present study, the apatite-forming ability of ethylene-vinyl alcohol copolymer (EVOH), whose surface was modified to be abundant in Si-OH groups, was investigated in a simulated body fluid (SBF) with ion concentrations nearly equal to those of human blood plasma. Surface modification of EVOH with Si-OH groups was carried out by reacting isocyanatopropyltriethoxysilane (IPTS) and subsequent hydrolysis of its Si-OC2H5 groups by 1M-HCl or saturated Ca(OH)2 aqueous solution. Apatite was, however, not formed on thus surface-modified EVOH in SBF even after 7 d. When the IPTS-treated EVOH was treated with silica or calcium silicate solution, the obtained specimen formed the apatite on its surface in SBF within 7 or 2 d, respectively. The present surface-modification of EVOH is effective for obtaining an apatite-polymer fiber composite in SBF, which could give bone substitute having bone-bonding ability as well as mechanical properties analogous to those of the natural bone.

    Scopus

  305. Macroporous silicate films by dip-coating Reviewed

    Kumon S, Nakanishi K, Hirao K

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 19 ( 1-3 ) page: 553 - 557   2000.12

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  306. Membrane emulsification using sol-gel derived macroporous silica glass Reviewed

    Fuchigami T, Toki M, Nakanishi K

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 19 ( 1-3 ) page: 337 - 341   2000.12

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  307. Porous gels made by phase separation: Recent progress and future directions Reviewed

    Nakanishi K

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 19 ( 1-3 ) page: 65 - 70   2000.12

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  308. Preparation of silicalite-1 within macroporous silica glass Reviewed

    Shikata H, Nakanishi K, Hirao K

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 19 ( 1-3 ) page: 769 - 773   2000.12

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  309. Preparation and chromatographic application of macroporous silicate in a capillary Reviewed

    Ishizuka N, Nakanishi K, Hirao K, Tanaka N

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 19 ( 1-3 ) page: 371 - 375   2000.12

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  310. Performance of a monolithic silica column in a capillary under pressure-driven and electrodriven conditions Reviewed

    Ishizuka N, Minakuchi H, Nakanishi K, Soga N, Nagayama H, Hosoya K, Tanaka N

    ANALYTICAL CHEMISTRY   Vol. 72 ( 6 ) page: 1275 - 1280   2000.3

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  311. Formation of hierarchical pore structure in silica gel Reviewed

    Nakanishi K, Takahashi R, Nagakane T, Kitayama K, Koheiya N, Shikata H, Soga N

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 17 ( 3 ) page: 191 - 210   2000.3

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  312. A new monolithic-type HPLC column for fast separations

    Cabrera K, Lubda D, Eggenweiler HM, Minakuchi H, Nakanishi K

    HRC-JOURNAL OF HIGH RESOLUTION CHROMATOGRAPHY   Vol. 23 ( 1 ) page: 93-99   2000.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Web of Science

  313. Monolithic silica columns for HPLC, micro-HPLC, and CEC Reviewed

    Tanaka N, Nagayama H, Kobayashi H, Ikegami T, Hosoya K, Ishizuka N, Minakuchi H, Nakanishi K, Cabrera K, Lubda D

    HRC-JOURNAL OF HIGH RESOLUTION CHROMATOGRAPHY   Vol. 23 ( 1 ) page: 111 - 116   2000.1

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  314. Tailoring mesopores in monolithic macroporous silica for HPLC Reviewed

    Nakanishi K, Shikata H, Ishizuka N, Koheiya N, Soga N

    HRC-JOURNAL OF HIGH RESOLUTION CHROMATOGRAPHY   Vol. 23 ( 1 ) page: 106 - 110   2000.1

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  315. Aggregation behavior of alkoxide-derived silica in sol-gel process in presence of poly(ethylene oxide) Reviewed

    R Takahashi, K Nakanishi, N Soga

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 17 ( 1 ) page: 7 - 18   2000.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:KLUWER ACADEMIC PUBL  

    Growth behavior of silica in an acid catalyzed sol-gel process from silicon alkoxide in the presence of poly(ethylene oxide), PEO, was investigated by in situ small angle X-ray scattering, SAXS, and Si-29 NMR measurements. The results of SAXS, that aggregation and gel formation behaviors of silica were affected by the presence of PEO, suggested a strong attractive interaction between silica oligomers and PEO. A possible reaction scheme of silica in the presence of PEO is as follows; (1) PEO and small silica oligomers coexist in the solution without specific interaction just after hydrolysis of the silicon alkoxide. (2) With the progress of condensation, a ramified aggregated complex between PEO and silica oligomers is formed, which is characterized by larger apparent value of radius of gyration and smaller fractal dimension than in the PEO-free system. (3) After gelation, the fractal dimension of scatterers remains to be smaller than that in the PEO-free system, because PEO associated with the silica network inhibits aggregation within the gel networks. Furthermore, PEO inhibits the condensation in the aging and in the drying process, leading to less strongly crosslinked dry gel. A temporal maximum in the time evolution of R-g was observed for the samples separated into two phases with their characteristic domain size being larger than several micrometers. This is considered to be a phenomenon related to increase and divergence of correlation length near and at the critical point.

    DOI: 10.1023/A:1008753718586

    Web of Science

    Scopus

    J-GLOBAL

  316. Effect of nonionic surfactant on phase separation behavior in methylsiloxane sol-gel systems Reviewed

    Nakanishi K, Miyawaki S, Soga N

    KOBUNSHI RONBUNSHU   Vol. 57 ( 6 ) page: 396 - 401   2000

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  317. Apatite formation on ethylene-vinyl alcohol copolymer modified with silane coupling agent and calcium silicate Reviewed

    A Oyane, M Minoda, T Miyamoto, K Nakanishi, M Kawashita, T Kokubo, T Nakamura

    BIOCERAMICS   Vol. 192-1   page: 713 - 716   2000

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:TRANS TECH PUBLICATIONS LTD  

    Silanol (SI-OH) groups on materials are believed to induce the apatite nucleation in the body environment. In the present study, the apatite-forming ability of ethylene-vinyl alcohol copolymer (EVOH), whose surface was modified to be abundant in Si-OH groups, was investigated in a simulated body fluid (SBF) with ion concentrations nearly equal to those of human blood plasma. Surface modification of EVOH with Si-OH groups was carried out by reacting isocyanatopropyltriethoxy silane (IPTS) and subsequent hydrolysis of its Si-OC2H5 groups by 1 M-HCl or saturated Ca(OH)(2) aqueous solution. Apatite was, however, not formed on thus surface-modified EVOH in SBF even after 7 d. When the IPTS-treated EVOH was treated with silica or calcium silicate solution, the obtained specimen formed the apatite on its surface in SBF within 7 or 2 d, respectively. The present surface-modification of EVOH is effective for obtaining an apatite-polymer fiber composite in SBF, which could give bone substitute having bone-bonding ability as well as mechanical properties analogous to those of the natural bone.

    DOI: 10.4028/www.scientific.net/KEM.192-195.713

    Web of Science

    Scopus

  318. A new monolithic-type HPLC column for fast separations

    Karin Cabrera, Dieter Lubda, Hans Michael Eggenweiler, H. Minakuchi, K. Nakanishi

    Journal of Separation Science   Vol. 23 ( 1 ) page: 93 - 99   2000

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    The application of a new silica-based, monolithic-type HPLC-column for fast separations is presented. The column is prepared according to a new sol-gel process, which is based on the hydrolysis and polycondensation of alkoxysilanes in the presence of water soluble polymers. The method leads to &quot;rods&quot; made of a single piece of porous silica with a defined pore structure, i. e. macro- and mesopores. The main feature of silica rod columns is a higher total porosity, about 15% higher than of conventional particulate HPLC columns. The resulting column pressure drop is therefore much lower, allowing operation at higher flow rates including flow gradients. Consequently, HPLC analysis can be performed much faster, as it is demonstrated by various applications. © WILEY-VCH Verlag GmbH, D-69451 Weinheim 2000.

    DOI: 10.1002/(SICI)1521-4168(20000101)23:1<93::AID-JHRC93>3.0.CO;2-2

    Scopus

  319. A new monolithic-type HPLC column for fast separations Reviewed

    Cabrera K., Lubda D., Eggenweiler H.M., Minakuchi H., Nakanishi K.

    Journal of Separation Science   Vol. 23 ( 1 ) page: 93 - 99   2000

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Journal of Separation Science  

    The application of a new silica-based, monolithic-type HPLC-column for fast separations is presented. The column is prepared according to a new sol-gel process, which is based on the hydrolysis and polycondensation of alkoxysilanes in the presence of water soluble polymers. The method leads to "rods" made of a single piece of porous silica with a defined pore structure, i. e. macro- and mesopores. The main feature of silica rod columns is a higher total porosity, about 15% higher than of conventional particulate HPLC columns. The resulting column pressure drop is therefore much lower, allowing operation at higher flow rates including flow gradients. Consequently, HPLC analysis can be performed much faster, as it is demonstrated by various applications. © WILEY-VCH Verlag GmbH, D-69451 Weinheim 2000.

    DOI: 10.1002/(sici)1521-4168(20000101)23:1<93::aid-jhrc93>3.3.co;2-u

    Scopus

  320. Apatite formation on ethylene-vinyl alcohol copolymer modified with silanol groups Reviewed

    A Oyane, M Minoda, T Miyamoto, R Takahashi, K Nakanishi, HM Kim, T Kokubo, T Nakamura

    JOURNAL OF BIOMEDICAL MATERIALS RESEARCH   Vol. 47 ( 3 ) page: 367 - 373   1999.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JOHN WILEY & SONS INC  

    The surfaces of ethylene-vinyl alcohol copolymer (EVOH) substrates were modified with silanol (Si-OH) groups, and their apatite forming ability was examined in a simulated body fluid (SBF) with ion concentrations nearly equal to those of human blood plasma or in a solution with ion concentrations 1.5 times those of SBF (1.5SBF). The surface modification of EVOH was carried out by reacting 3-iso-cyanatopropyltriethoxysilane, followed by hydrolysis of the ethoxysilyl groups into Si-OH groups. However, no apatite formation was observed on the EVOH substrate thus modified, even after 3 weeks in SBF and 1.5SBF. The Si-OH modified EVOH substrate was further modified by hydrolysis and polycondensation of tetraethyoxysilane (TEOS). It was found that the apatite forms on the TEOS-modified substrate within 3 weeks in 1.5SBF. These results suggest that the presence of a large amount of Si-OH groups (i.e., a cluster of Si-OH groups) on the substrate is prerequisite to apatite formation in the body environment. Apatite-EVOH composites prepared by this process might be useful as hard tissues substitutes. (C) 1999 John Wiley & Sons, Inc.

    DOI: 10.1002/(SICI)1097-4636(19991205)47:3<367::AID-JBM11>3.0.CO;2-A

    Web of Science

    Scopus

    PubMed

  321. Sol-gel modification of silicone to induce apatite-forming ability Reviewed

    Oyane A, Nakanishi K, Kim HM, Miyaji F, Kokubo T, Soga N, Nakamura T

    BIOMATERIALS   Vol. 20 ( 1 ) page: 79 - 84   1999.1

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Web of Science

  322. Performance of an octadecylsilylated continuous porous silica column in polypeptide separations Reviewed

    Minakuchi H, Ishizuka N, Nakanishi K, Soga N, Tanaka N

    JOURNAL OF CHROMATOGRAPHY A   Vol. 828 ( 1-2 ) page: 83 - 90   1998.12

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  323. Structural study of mesoporous titania and titanium stearic acid complex prepared from titanium alkoxide Reviewed

    Takahashi R, Takenaka S, Sato S, Sodesawa T, Ogura K, Nakanishi K

    JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS   Vol. 94 ( 20 ) page: 3161 - 3168   1998.10

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  324. Preparation of macroporous titania films by a sol-gel dip-coating method from the system containing poly(ethylene glycol) Reviewed

    Kajihara K, Nakanishi K, Tanaka K, Hirao K, Soga N

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   Vol. 81 ( 10 ) page: 2670 - 2676   1998.10

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Web of Science

  325. Chromatographic properties of miniaturized silica rod columns Reviewed

    N Ishizuka, H Minakuchi, K Nakanishi, N Soga, K Hosoya, N Tanaka

    HRC-JOURNAL OF HIGH RESOLUTION CHROMATOGRAPHY   Vol. 21 ( 8 ) page: 477 - 479   1998.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-V C H VERLAG GMBH  

    DOI: 10.1002/(SICI)1521-4168(19980801)21:8<477::AID-JHRC477>3.0.CO;2-K

    Web of Science

    Scopus

  326. Morphology control of macroporous silica-zirconia gel based on phase separation Reviewed

    Takahashi R, Nakanishi K, Soga N

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   Vol. 106 ( 8 ) page: 772 - 777   1998.8

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.2109/jcersj.106.772

    Web of Science

  327. Apatite formation on silica gel in simulated body fluid: effects of structural modification with solvent-exchange Reviewed

    SB Cho, F Miyaji, T Kokubo, K Nakanishi, N Soga, T Nakamura

    JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE   Vol. 9 ( 5 ) page: 279 - 284   1998.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:KLUWER ACADEMIC PUBL  

    The prerequisite for glasses and glass-ceramics to bond to living bone is the formation of biologically active bone-like apatite on their surfaces. It has been shown that even a pure silica gel forms the bone-like apatite on its surface in a simulated body fluid. In the present study, pore structure of silica gels prepared by hydrolysis and polycondensation of tetraethoxysilane in an aqueous solution containing polyethylene glycol was modified by 1M HNO3, and 0.1M and 1M NH4OH solution treatments. The three kinds of resultant gels all contained large amounts of silanol groups and trisiloxane rings, but differ greatly in pore structure of nanometre pore size. Irrespective of these differences, all the gels formed the bone-like apatite on their surface in the simulated body fluid. It was speculated that a certain type of structural unit of silanol groups, which is easily formed in the presence of the polyethylene glycol, is effective for the apatite formation. (C) 1998 Chapman & Hall.

    DOI: 10.1023/A:1008808828567

    Web of Science

    Scopus

    PubMed

  328. Designing double pore structure in alkoxy-derived silica incorporated with nonionic surfactant Reviewed

    K Nakanishi, T Nagakane, N Soga

    JOURNAL OF POROUS MATERIALS   Vol. 5 ( 2 ) page: 103 - 110   1998.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:KLUWER ACADEMIC PUBL  

    The principle of designing double-pore structure in alkoxy-derived silica is described with the experimental system containing polyoxyethylene nonylphenylether. The formation of macropores is consistently explained in terms of the concurrence of a phase separation and a sol-gel transition in the polymerizing silica-surfactant-solvent system. The composition-morphology relationship exhibited a substantial variation depending on the length of oxyethylene units in the surfactant molecule. The mesopore volume obtained after basic solvent exchange and a heat-treatment suggested that the surfactant with shorter oxyethylene chain tends to be incorporated more in the gel phase to give higher mesopore volume. The small-angle X-ray scattering measurement of the gelling and aging system supported this hypothesis indicating micelle formation in the system containing a surfactant with shorter oxyethylene chain.

    DOI: 10.1023/A:1009633102016

    Web of Science

    Scopus

  329. Designing monolithic double-pore silica for high-speed liquid chromatography Reviewed

    N Ishizuka, H Minakuchi, K Nakanishi, N Soga, N Tanaka

    JOURNAL OF CHROMATOGRAPHY A   Vol. 797 ( 1-2 ) page: 133 - 137   1998.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    A novel type of silica-based chromatographic column without particle-packed structure has been recently developed. A monolithic silica gel having continuous gel skeletons and through-pores together with open mesopores is the key material of this 'rod column'. The principle and procedure of designing the built-in pore structure is explained. (C) 1998 Elsevier Science B.V.

    DOI: 10.1016/S0021-9673(97)01202-8

    Web of Science

    Scopus

  330. Effect of domain size on the performance of octadecylsilylated continuous porous silica columns in reversed-phase liquid chromatography Reviewed

    Minakuchi H, Nakanishi K, Soga N, Ishizuka N, Tanaka N

    JOURNAL OF CHROMATOGRAPHY A   Vol. 797 ( 1-2 ) page: 121 - 131   1998.2

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  331. SilicaROD (TM) - A new challenge in fast high-performance liquid chromatography separations Reviewed

    Cabrera K, Wieland G, Lubda D, Nakanishi K, Soga N, Minakuchi H, Unger KK

    TRAC-TRENDS IN ANALYTICAL CHEMISTRY   Vol. 17 ( 1 ) page: 50 - 53   1998.1

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  332. Monolithic HPLC column via sol-gel route Reviewed

    Nakanishi K, Minakuchi H, Ishizuka N, Soga N

    SOL-GEL SYNTHESIS AND PROCESSING   Vol. 95   page: 139 - 150   1998

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  333. Structure design of double-pore silica and its application to HPLC Reviewed

    Nakanishi K, Minakuchi H, Soga N, Tanaka N

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 13 ( 1-3 ) page: 163 - 169   1998

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  334. Pore Structure Control of Silica Gels Based on Phase Separation Reviewed

    Nakanishi Kazuki

    JOURNAL OF POROUS MATERIALS   Vol. 4 ( 2 ) page: 67 - 112   1997.6

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  335. Phase separation in silica sol-gel system containing poly(ethylene oxide) .2. Effects of molecular weight and temperature Reviewed

    Nakanishi K, Soga N

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   Vol. 70 ( 3 ) page: 587 - 592   1997.3

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  336. Effect of skeleton size on the performance of octadecylsilylated continuous porous silica columns in reversed-phase liquid chromatography Reviewed

    Minakuchi H, Nakanishi K, Soga N, Ishizuka N, Tanaka N

    JOURNAL OF CHROMATOGRAPHY A   Vol. 762 ( 1-2 ) page: 135 - 146   1997.2

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  337. Double pore silica gel monolith applied to liquid chromatography Reviewed

    K Nakanishi, H Minakuchi, N Soga, N Tanaka

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 8 ( 1-3 ) page: 547 - 552   1997

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:KLUWER ACADEMIC PUBL  

    Silica gels retaining double pore structure in the size ranges of micrometer and nanometer have been applied to the rod-shaped monolithic column for liquid chromatography. The macropore structure was designed by controlling the phase separation process induced by the hydrolysis and polycondensation of alkoxysilane, whereas the mesopore structure was tailored by the solvent exchange treatments on wet gels. The size exclusion chromatograms on polystyrene standards exhibited almost similar features for octadecyl-modified rod and conventional packed beads columns. The dependence of plate height on the velocity of mobile phase determined for amylbenzene was by far weaker in the rod column than in the packed beads column, suggesting that additional geometrical factors should be considered in describing the separation mechanism in the rod column.

    DOI: 10.1023/A:1018331101606

    Web of Science

    Scopus

    J-GLOBAL

  338. Phase separation process of polymer-incorporated silica-zirconia sol-gel system Reviewed

    Takahashi R, Nakanishi K, Soga N

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 8 ( 1-3 ) page: 71 - 76   1997

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  339. Apatite-forming ability of silicate ion dissolved from silica gels Reviewed

    SB Cho, F Miyaji, T Kokubo, K Nakanishi, N Soga, T Nakamura

    JOURNAL OF BIOMEDICAL MATERIALS RESEARCH   Vol. 32 ( 3 ) page: 375 - 381   1996.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JOHN WILEY & SONS INC  

    It is known that the prerequisite for glasses and glass-ceramics to bond to living bone is the formation of biologically active bonelike apatite on their surfaces, and a certain type of hydrated silica developed on their surfaces plays an important role in nucleating the apatite. In the present study, the apatite-forming ability of silicate ion dissolved from different silica materials into a simulated body fluid was examined as follows. Polyether sulfone substrates pretreated with O-2 plasma were placed in parallel to plates of three kinds of silica gels prepared in different media and silica glass, with a distance of 0.5 mm between them in a simulated body fluid with ion concentrations nearly equal to those of human blood plasma for 4 days, and then soaked in a solution with ion concentrations 1.5 times those of the simulated body fluid for 6 days. After the first soaking, silicon combined with oxygen was detected on the surfaces of the substrates faced to all the silica gels, whereas it was not detected on that faced to the silica glass. After the second soaking, the former formed a bonelike apatite layer on their surfaces, but the latter did not. These results indicate that silicate ion which is dissolved from the silica gels and adsorbed on the substrates has an apatite-forming ability, irrespective of the microstructure of the original silica gels. (C) 1996 John Wiley & Sons, Inc.

    DOI: 10.1002/(SICI)1097-4636(199611)32:3<375::AID-JBM10>3.0.CO;2-G

    Web of Science

    Scopus

    PubMed

  340. Octadecylsilylated porous silica rods as separation media for reversed-phase liquid chromatography Reviewed

    Minakuchi H, Nakanishi K, Soga N, Ishizuka N, Tanaka N

    ANALYTICAL CHEMISTRY   Vol. 68 ( 19 ) page: 3498 - 3501   1996.10

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  341. Apatite formation on various silica gels in a simulated body fluid containing excessive calcium ion Reviewed

    SB Cho, F Miyaji, T Kokubo, K Nakanishi, N Soga, T Nakamura

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   Vol. 104 ( 5 ) page: 399 - 404   1996.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    It was previously shown that a silica gel prepared in a solution containing polyethylene glycol (S-PEG) induces the apatite nucleation in SBF, but those prepared in pure water (S-W) and a solution containing polyacrylic acid (S-PAA) do not induce it. This indicates that a limited type of silanol groups is effective for apatite nucleation. In the present study, apatite-forming ability of these silica gels was examined in SBF containing excessive calcium ion. It was found that all these silica gels formed the apatite on their surfaces in this fluid, although the rate of apatite formation decreased in the order S-PEG &gt; S-PAA &gt; S-W. This indicates that any type of silanol groups has potential for inducing apatite nucleation under this condition. Such environment rich in calcium ion is produced around the surfaces of CaO, SiO2-based glasses and glass-ceramics when they are implanted into living body. The present results indicate that the CaO-SiO2 system can be a good basic composition for bioactive glasses and glass-ceramics.

    DOI: 10.2109/jcersj.104.399

    Web of Science

    Scopus

    J-GLOBAL

  342. Apatite formation on silica gel in simulated body fluid: Its dependence on structures of silica gels prepared in different media Reviewed

    Sung-Baek Cho, Kazuki Nakanishi, Tadashi Kokubo, Naohiro Soga, Chikara Ohtsuki, Takashi Nakamura

    Journal of Biomedical Materials Research   Vol. 33 ( 3 ) page: 145 - 151   1996

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    It has been shown that the prerequisite for glasses and glass-ceramics to bond to living bone is the formation of a layer of biologically active bonelike apatite on their surfaces. The hydrated silica formed on the surfaces of glasses and glass-ceramics plays an important role in nucleating the apatite. In the present study, the structure of the hydrated silica responsible for the apatite nucleation was investigated in an acellular simulated body fluid with ion concentrations nearly equal to those of human blood plasma. Three kinds of porous silica gels were prepared by hydrolysis and polycondensation of tetraethoxysilane in pure water or in aqueous solution containing polyethylene glycol or polyacrylic acid. The silica gels prepared in aqueous solution containing polyethylene glycol or polyacrylic acid had micron-size interconnected pores, whereas the gel prepared in pure water did not. All the gels contained a large volume of nanometer-size pores, almost the same amounts of silanol groups and D2 defect, and showed a high dissolution rate of the silica. Despite this, only the gel prepared in the solution containing polyethylene glycol formed the apatite on its surface in the simulated body fluid. This indicates that only a certain type of structural unit of the silanol group is responsible for the apatite nucleation.

    DOI: 10.1002/(SICI)1097-4636(199623)33:3<145::AID-JBM4>3.0.CO;2-Q

    Web of Science

    Scopus

    PubMed

  343. EFFECTS OF AGING AND SOLVENT EXCHANGE ON PORE STRUCTURE OF SILICA-GELS WITH INTERCONNECTED MACROPORES Reviewed

    TAKAHASHI R, NAKANISHI K, SOGA N

    JOURNAL OF NON-CRYSTALLINE SOLIDS   Vol. 189 ( 1-2 ) page: 66 - 76   1995.8

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  344. DEPENDENCE OF APATITE FORMATION ON SILICA-GEL ON ITS STRUCTURE - EFFECT OF HEAT-TREATMENT Reviewed

    SB CHO, K NAKANISHI, T KOKUBO, N SOGA, C OHTSUKI, T NAKAMURA, T KITSUGI, T YAMAMURO

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   Vol. 78 ( 7 ) page: 1769 - 1774   1995.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CERAMIC SOC 735 CERAMIC PLACE  

    The prerequisite for glasses and glass-ceramics to bond to living bone is the formation of biologically active bonelike apatite on their surfaces in the body. Our previous study showed that a silica gel prepared by hydrolysis and polycondensation of tetraethoxysilane in aqueous solution containing poly(ethylene glycol) induces apatite nucleation on its surface in a simulated body fluid. In the present study, the effects of heat treatment of silica gel on its catalytic effects in apatite nucleation was investigated in a simulated body fluid, It was found that apatite forms on the surfaces of silica gels heat-treated below 800 degrees C, but not on those heat-treated above 900 degrees C. The volume of nanometer-range pores in the gel remarkably decreased by heat treatment above 900 degrees C. The concentration of silanol groups in the silica gels gradually decreased with increasing heat treatment temperature. The rate of silica dissolution from the gel into the simulated body fluid decreased remarkably by heat treatment above 900 degrees C. This suggested that a special type of silanol group which is formed by soaking the gel treated below 800 degrees C into the simulated body fluid is responsible for apatite nucleation.

    DOI: 10.1111/j.1151-2916.1995.tb08887.x

    Web of Science

    Scopus

    J-GLOBAL

  345. Formation of porous gel morphology by phase separation in gelling alkoxy-derived silica. Phenomenological study

    Kaji H.

    Journal of Non-Crystalline Solids   Vol. 185 ( 1-2 ) page: 18-30   1995.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/0022-3093(94)00670-9

    Scopus

  346. FORMATION OF POROUS GEL MORPHOLOGY BY PHASE-SEPARATION IN GELLING ALKOXY-DERIVED SILICA - PHENOMENOLOGICAL STUDY

    KAJI H, NAKANISHI K, SOGA N

    JOURNAL OF NON-CRYSTALLINE SOLIDS   Vol. 185 ( 1-2 ) page: 18-30   1995.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Web of Science

  347. Formation of porous gel morphology by phase separation in gelling alkoxy-derived silica. Affinity between silica polymers and solvent.

    Kaji H.

    Journal of Non-Crystalline Solids   Vol. 181 ( 1-2 ) page: 16-26   1995.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/0022-3093(94)00417-L

    Scopus

  348. FORMATION OF POROUS GEL MORPHOLOGY BY PHASE-SEPARATION IN GELLING ALKOXY-DERIVED SILICA - AFFINITY BETWEEN SILICA POLYMERS AND SOLVENT

    KAJI H, NAKANISHI K, SOGA N

    JOURNAL OF NON-CRYSTALLINE SOLIDS   Vol. 181 ( 1-2 ) page: 16-26   1995.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Web of Science

  349. Small-angle X-Ray scattering study of nanopore evolution of macroporous silica gel by solvent exchange Reviewed

    Takahashi R, Nakanishi K, Soga N

    FARADAY DISCUSSIONS   Vol. 101   page: 249 - 263   1995

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  350. PHASE-SEPARATION IN SILICA SOL-GEL SYSTEM CONTAINING POLY(ETHYLENE OXIDE) .1. PHASE RELATION AND GEL MORPHOLOGY Reviewed

    NAKANISHI K, KOMURA H, TAKAHASHI R, SOGA N

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   Vol. 67 ( 5 ) page: 1327 - 1335   1994.5

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  351. In Situ Observation of Phase Separation Processes in Gelling Alkoxy-Derived Silica System by Light Scattering Method Reviewed

    Kaji Hironori, Nakanishi Kazuki, Soga Naohiro, Inoue Tadashi, Nemoto Norio

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 3 ( 3 ) page: 169 - 188   1994.1

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Web of Science

  352. Phase Separation Kinetics in Silica Sol-Gel System Containing Polyethylene Oxide. I. Initial Stage Reviewed

    Nakanishi Kazuki, Yamasaki Yuki, Kaji Hironori, Soga Naohiro, Inoue Tadashi, Nemoto Norio

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 2 ( 1-3 ) page: 227 - 231   1994.1

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Web of Science

  353. THE ROLE OF HYDRATED SILICA, TITANIA, AND ALUMINA IN INDUCING APATITE ON IMPLANTS Reviewed

    LI PJ, OHTSUKI C, KOKUBO T, NAKANISHI K, SOGA N, DEGROOT K

    JOURNAL OF BIOMEDICAL MATERIALS RESEARCH   Vol. 28 ( 1 ) page: 7 - 15   1994.1

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Web of Science

  354. Dependence of bone-like apatite formation on structure of silica gel Reviewed

    T Kokubo, SB Cho, K Nakanishi, N Soga, C Ohtsuki, T Kitsugi, T Yamamuro, T Nakamura

    BIOCERAMICS, VOL 7     page: 49 - 54   1994

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PERGAMON PRESS LTD  

    Web of Science

  355. INDUCTION AND MORPHOLOGY OF HYDROXYAPATITE, PRECIPITATED FROM METASTABLE SIMULATED BODY-FLUIDS ON SOL-GEL PREPARED SILICA Reviewed

    LI PJ, NAKANISHI K, KOKUBO T, DEGROOT K

    BIOMATERIALS   Vol. 14 ( 13 ) page: 963 - 968   1993.10

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  356. PROCESS OF FORMATION OF BONE-LIKE APATITE LAYER ON SILICA-GEL Reviewed

    LI P, OHTSUKI C, KOKUBO T, NAKANISHI K, SOGA N, NAKAMURA T, YAMAMURO T

    JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE   Vol. 4 ( 2 ) page: 127 - 131   1993.3

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Web of Science

  357. Polymerization-Induced Phase Separation in Silica Sol-Gel Systems Containing Formamide Reviewed

    Kaji Hironori, Nakanishi Kazuki, Soga Naohiro

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 1 ( 1 ) page: 35 - 46   1993.1

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Web of Science

  358. MACROPORE STRUCTURE DESIGN OF SOL-GEL DERIVED SILICA BY SPINODAL DECOMPOSITION Reviewed

    NAKANISHI K, KAJI H, SOGA N

    POROUS MATERIALS   Vol. 31   page: 51 - 60   1993

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  359. EFFECTS OF IONS IN AQUEOUS-MEDIA ON HYDROXYAPATITE INDUCTION BY SILICA-GEL AND ITS RELEVANCE TO BIOACTIVITY OF BIOACTIVE GLASSES AND GLASS-CERAMICS Reviewed

    LI P, OHTSUKI C, KOKUBO T, NAKANISHI K, SOGA N, NAKAMURA T, YAMAMURO T

    JOURNAL OF APPLIED BIOMATERIALS   Vol. 4 ( 3 ) page: 221 - 229   1993

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Web of Science

  360. DUAL-POROSITY SILICA-GELS BY POLYMER-INCORPORATED SOL-GEL PROCESS Reviewed

    K NAKANISHI, R TAKAHASHI, N SOGA

    JOURNAL OF NON-CRYSTALLINE SOLIDS   Vol. 147 ( C ) page: 291 - 295   1992.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Pore characteristics of silica gels prepared by the polymer-incorporated alkoxide-based sol-gel process have been investigated. Micrometer-range Pore sizes could be controlled by changing several reaction parameters, such as molecular weight or concentration of polymer or reaction temperature, that affect the domain formation process due to an occurrence of phase separation during a gel-forming reaction. The volume fraction and size distribution of nanometer-range pores after a heat treatment were varied by different solvent exchange treatments of a wet gel.

    DOI: 10.1016/S0022-3093(05)80632-5

    Web of Science

    Scopus

    J-GLOBAL

  361. APATITE FORMATION INDUCED BY SILICA-GEL IN A SIMULATED BODY-FLUID Reviewed

    PJ LI, C OHTSUKI, T KOKUBO, K NAKANISHI, N SOGA, T NAKAMURA, T YAMAMURO

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   Vol. 75 ( 8 ) page: 2094 - 2097   1992.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CERAMIC SOC  

    It has been confirmed that the essential condition for glasses and glass-ceramics to bond to living bone is,the formation of an apatite layer on their surfaces in the body. It has been proposed that a hydrated silica formed on the surfaces of these materials in the body plays an important role in forming the surface apatite layer, but this has not yet been proved. In the present study, it is shown experimentally that a pure hydrated silica gel can induce apatite formation on its surface in a simulated body fluid when its starting pH is increased from 7.2 to 7.4.

    DOI: 10.1111/j.1151-2916.1992.tb04470.x

    Web of Science

    Scopus

    J-GLOBAL

  362. MODIFICATION OF NANOMETER RANGE PORES IN SILICA-GELS WITH INTERCONNECTED MACROPORES BY SOLVENT EXCHANGE Reviewed

    KAJI H, NAKANISHI K, SOGA N, HORII F

    JOURNAL OF NON-CRYSTALLINE SOLIDS   Vol. 145 ( 1-3 ) page: 80 - 84   1992.8

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Web of Science

  363. PHASE-SEPARATION IN SILICA SOL-GEL SYSTEM CONTAINING POLYACRYLIC-ACID .3. EFFECT OF CATALYTIC CONDITION Reviewed

    NAKANISHI K, SOGA N

    JOURNAL OF NON-CRYSTALLINE SOLIDS   Vol. 142 ( 1-2 ) page: 36 - 44   1992.4

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  364. SMALL-ANGLE X-RAY-SCATTERING STUDY OF GELLING SILICA ORGANIC POLYMER-SOLUTION - SYSTEMS CONTAINING POLY(SODIUM STYRENE-SULFONATE) Reviewed

    NAKANISHI K, SOGA N, MATSUOKA H, ISE N

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   Vol. 75 ( 4 ) page: 971 - 975   1992.4

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  365. PHASE-SEPARATION IN SILICA SOL-GEL SYSTEM CONTAINING POLYACRYLIC-ACID .4. EFFECT OF CHEMICAL ADDITIVES Reviewed

    NAKANISHI K, SOGA N

    JOURNAL OF NON-CRYSTALLINE SOLIDS   Vol. 142 ( 1-2 ) page: 45 - 54   1992.4

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  366. PHASE-SEPARATION IN SILICA SOL-GEL SYSTEM CONTAINING POLYACRYLIC-ACID .1. GEL FORMATION BEHAVIOR AND EFFECT OF SOLVENT COMPOSITION Reviewed

    NAKANISHI K, SOGA N

    JOURNAL OF NON-CRYSTALLINE SOLIDS   Vol. 139 ( 1 ) page: 1 - 13   1992.1

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  367. PHASE-SEPARATION IN SILICA SOL-GEL SYSTEM CONTAINING POLYACRYLIC-ACID .2. EFFECTS OF MOLECULAR-WEIGHT AND TEMPERATURE Reviewed

    NAKANISHI K, SOGA N

    JOURNAL OF NON-CRYSTALLINE SOLIDS   Vol. 139 ( 1 ) page: 14 - 24   1992.1

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  368. MACROPORE MORPHOLOGY CONTROL OF SILICA-GEL BY SPINODAL DECOMPOSITION Reviewed

    NAKANISHI K, SOGA N

    CHEMICAL PROCESSING OF ADVANCED MATERIALS     page: 29 - 41   1992

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  369. PHASE-SEPARATION IN GELLING SILICA ORGANIC POLYMER-SOLUTION - SYSTEMS CONTAINING POLY(SODIUM STYRENESULFONATE) Reviewed

    NAKANISHI K, SOGA N

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   Vol. 74 ( 10 ) page: 2518 - 2530   1991.10

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  370. PORE SURFACE CHARACTERISTICS OF MACROPOROUS SILICA-GELS PREPARED FROM POLYMER-CONTAINING SOLUTION Reviewed

    NAKANISHI K, SAGAWA Y, SOGA N

    JOURNAL OF NON-CRYSTALLINE SOLIDS   Vol. 134 ( 1-2 ) page: 39 - 46   1991.9

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  371. SMALL-ANGLE X-RAY-SCATTERING STUDY ON SOL-GEL TRANSITION OF MIXTURES OF COLLOIDAL SILICA AND ORGANIC POLYMER Reviewed

    MATSUOKA H, CHEN S, ISHII H, ISE N, NAKANISHI K, SOGA N

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   Vol. 64 ( 4 ) page: 1283 - 1288   1991

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  372. EFFECT OF STRESS ON WATER CORROSION OF BORATE GLASS Reviewed

    SOGA N, ZHANG ZY, NAKANISHI K, HIRAO K

    JOURNAL OF NON-CRYSTALLINE SOLIDS   Vol. 112 ( 1-3 ) page: 377 - 380   1989.10

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  373. CRYSTALLIZATION OF SILICA-GELS CONTAINING SODIUM POLY-4-STYRENE SULFONATE Reviewed

    K NAKANISHI, N SOGA

    JOURNAL OF NON-CRYSTALLINE SOLIDS   Vol. 108 ( 2 ) page: 157 - 162   1989.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    DOI: 10.1016/0022-3093(89)90578-4

    Web of Science

    Scopus

  374. THE EFFECT OF TWO-DIMENSIONAL COMPRESSIVE STRESS ON THE DISSOLUTION RATE OF GLASS IN WATER Reviewed

    ZHANG Z, NAKANISHI K, HIRAO K, SOGA N

    NIPPON SERAMIKKUSU KYOKAI GAKUJUTSU RONBUNSHI-JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   Vol. 97 ( 3 ) page: 365 - 369   1989

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  375. ADSORPTION OF ALCOHOL VAPORS ON ALKOXIDE-DERIVED SILICA-GELS Reviewed

    K NAKANISHI, N SOGA

    JOURNAL OF NON-CRYSTALLINE SOLIDS   Vol. 100 ( 1-3 ) page: 399 - 403   1988.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    DOI: 10.1016/0022-3093(88)90053-1

    Web of Science

    J-GLOBAL

  376. SORPTION OF ALCOHOL VAPORS IN A DISUBSTITUTED POLYACETYLENE Reviewed

    NAKANISHI K, ODANI H, KURATA M, MASUDA T, HIGASHIMURA T

    POLYMER JOURNAL   Vol. 19 ( 2 ) page: 293 - 296   1987

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

  377. PERMEATION OF GASES IN POLY[1-(TRIMETHYLSILYL)-1-PROPYNE] Reviewed

    SHIMOMURA H, NAKANISHI K, ODANI H, KURATA M, MASUDA T, HIGASHIMURA T

    KOBUNSHI RONBUNSHU   Vol. 43 ( 11 ) page: 747 - 753   1986

     More details

    Publishing type:Research paper (scientific journal)  

    Web of Science

▼display all

Books 11

  1. Macroporous morphology control by phase separation

    Nakanishi K.( Role: Joint author)

    Handbook of Sol-Gel Science and Technology: Processing, Characterization and Applications  2018.7  ( ISBN:9783319320991

     More details

    Language:Japanese Book type:Scholarly book

    Polymerization-induced phase separation has been utilized to control the macroporous morphology of sol-gel derived materials in a variety of compositions including oxides and phosphates. Monolithic gels with well-defined co-continuous macropores and solid skeletons can be prepared from precursors such as metal alkoxides, organically modified organosilanes, and salts of various metals. The volume and size of macropores can be precisely controlled with sharp distributions by the starting compositions and reaction conditions. Additional tailoring of the micro-mesopores within micrometer-sized gel skeletons is possible either by supramolecular templating or appropriate post-gelation treatments represented by a solvothermal aging. The hierarchically porous monoliths thus obtained can be applied to various liquid-solid contact devices such as separation media for liquid chromatography.

    DOI: 10.1007/978-3-319-32101-1_25

    Scopus

  2. Porosity measurement

    Nakanishi K.( Role: Joint author)

    Handbook of Sol-Gel Science and Technology: Processing, Characterization and Applications  2018.7  ( ISBN:9783319320991

     More details

    Language:Japanese Book type:Scholarly book

    Methods of determining porosity of solid materials are described. Since the spectrum of pore size spreads from sub-nanometers to millimeters, appropriate methods should be adopted to adequately determine the volume and size of the pores contained in the solid materials. Representative methods including liquid intrusion and gas adsorption are concisely explained assuming the samples are obtained via sol-gel routes. Recent direct method of determining the three-dimensional configurations of pores and solid parts will also be introduced.

    DOI: 10.1007/978-3-319-32101-1_38

    Scopus

  3. Monolithic porous silica for high-speed HPLC

    Nakanishi K.( Role: Joint author)

    Handbook of Sol-Gel Science and Technology: Processing, Characterization and Applications  2018.7  ( ISBN:9783319320991

     More details

    Language:Japanese Book type:Scholarly book

    As one of the successful applications of hierarchically porous monolithic silica, HPLC column without particle-packed structure is briefly introduced. With a progress of manufacturing technology over 20 years of development, highly efficient column structure can be fabricated in various column thickness; besides the traditional analytical column dimension of 4.6 mmID, semi-micro (1-2 mmID) and capillary (<0.5 mmID) formats are now available. Especially in the capillary format, elongated columns can separate very complex biochemical mixtures coupled with mass spectrometric detectors.

    DOI: 10.1007/978-3-319-32101-1_54

    Scopus

  4. Hierarchically Structured Porous Materials: Application to Separation Sciences

    Kazuki Nakanishi( Role: Joint author)

    Wiley-VCH  2011.11  ( ISBN:9783527327881

     More details

    Language:English Book type:Scholarly book

    DOI: 10.1002/9783527639588.ch17

    Scopus

  5. Hierarchically Porous Materials by Phase Separation: Monoliths

    Kazuki Nakanishi( Role: Joint author)

    Wiley-VCH  2011.11  ( ISBN:9783527327881

     More details

    Language:English Book type:Scholarly book

    DOI: 10.1002/9783527639588.ch8

    Scopus

  6. Hierarchically Structured Porous Materials. From Nanoscience to Catalysis, Optics, and Energy

    K. Nakanishi( Role: Joint author)

    Wiley-VCH  2011.11 

     More details

    Language:English Book type:Scholarly book

  7. Monolithic Silicas in Separation Science: Concepts, Syntheses, Characterization, Modeling and Applications

    K. Nakanishi( Role: Joint author)

    Wiley-VCH  2011.3 

     More details

    Language:English Book type:Scholarly book

  8. Microscopic Characterizations

    Haruko Saito, Kazuyoshi Kanamori, Kazuki Nakanishi( Role: Joint author)

    Wiley-VCH  2011.1  ( ISBN:9783527325757

     More details

    Language:English Book type:Scholarly book

    DOI: 10.1002/9783527633241.ch5

    Scopus

  9. Apatite-Forming Ability of Ethylene-Vinyl Alcohol Copolymer Fibers Modified with a Silane Coupling Agent and Calcium Silicate Solutions

    中西 和樹( Role: Joint author)

    "MATERIALS SCIENCE FOR THE 21ST CENTURY",vol. B, pp.75-78  2001 

     More details

    Language:English Book type:Scholarly book

  10. Apatite Formation on Ethylene-vinyl Alcohol Copolymer Modified with Calcium Silicate

    中西 和樹( Role: Joint author)

    Transactions of the Sixth World Biomaterials Congress,Vol. III, pp.1304  2000 

     More details

    Language:English Book type:Scholarly book

  11. Deposition of Microcrystalline Silicalite within Sol-Gel Derived Macroporous Silica

    中西 和樹( Role: Joint author)

    Proc. Joint ISHR & ICSTR,399-402  2000 

     More details

    Language:English Book type:Scholarly book

▼display all

MISC 221

  1. Superhydrophobic highly flexible doubly cross-linked aerogel/carbon nanotube composites as strain/pressure sensors Reviewed

    Zu G, Wang X, Kanamori K, Nakanishi K

    Journal of materials chemistry. B     2020.3

     More details

    Language:English  

    DOI: 10.1039/c9tb02953b

    PubMed

  2. Superelastic Triple-Network Polyorganosiloxane-Based Aerogels as Transparent Thermal Superinsulators and Efficient Separators

    Zu Guoqing, Kanamori Kazuyoshi, Wang Xiaodong, Nakanishi Kazuki, Shen Jun

    CHEMISTRY OF MATERIALS   Vol. 32 ( 4 ) page: 1595-1604   2020.2

     More details

  3. Variation of meso- and macroporous morphologies in resorcinol–formaldehyde (RF) gels tailored via a sol–gel process combined with soft-templating and phase separation

    Hasegawa George, Yano Takaya, Akamatsu Hirofumi, Hayashi Katsuro, Nakanishi Kazuki

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY     2020.2

     More details

  4. Self-Assembly of Metal–Organic Frameworks into Monolithic Materials with Highly Controlled Trimodal Pore Structures

    Hara Yosuke, Kanamori Kazuyoshi, Nakanishi Kazuki

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   Vol. 58 ( 52 ) page: 19047-19053   2019.12

     More details

    Language:English  

    DOI: 10.1002/anie.201911499

    Web of Science

  5. Resilient, fire-retardant and mechanically strong polyimide-polyvinylpolymethylsiloxane composite aerogel prepared via stepwise chemical liquid deposition

    Zhang Ze, Wang Xiaodong, Zu Guoqing, Kanamori Kazuyoshi, Nakanishi Kazuki, Shen Jun

    MATERIALS & DESIGN   Vol. 183   2019.12

     More details

  6. Superelastic Multifunctional Aminosilane-Crosslinked Graphene Aerogels for High Thermal Insulation, Three-Component Separation, and Strain/Pressure-Sensing Arrays

    Zu Guoqing, Kanamori Kazuyoshi, Nakanishi Kazuki, Lu Xuanming, Yu Kunhua, Huang Jia, Sugimura Hiroyuki

    ACS APPLIED MATERIALS & INTERFACES   Vol. 11 ( 46 ) page: 43533-43542   2019.11

     More details

    Language:English  

    DOI: 10.1021/acsami.9b16746

    Web of Science

  7. Thermogravimetric Evolved Gas Analysis and Microscopic Elemental Mapping of the Solid Electrolyte Interphase on Silicon Incorporated in Free-Standing Porous Carbon Electrodes

    Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki, Hayashi Katsuro

    LANGMUIR   Vol. 35 ( 39 ) page: 12680-12688   2019.10

     More details

  8. Ambient-dried highly flexible copolymer aerogels and their nanocomposites with polypyrrole for thermal insulation, separation, and pressure sensing

    Zu Guoqing, Kanamori Kazuyoshi, Maeno Ayaka, Kaji Hironori, Nakanishi Kazuki, Shen Jun

    POLYMER CHEMISTRY   Vol. 10 ( 36 ) page: 4980-4990   2019.9

     More details

    Language:English  

    DOI: 10.1039/c9py00751b

    Web of Science

  9. Superhydrophobic Ultraflexible Triple-Network Graphene/Polyorganosiloxane Aerogels for a High-Performance Multifunctional Temperature/Strain/Pressure Sensing Array

    Zu Guoqing, Kanamori Kazuyoshi, Nakanishi Kazuki, Huang Jia

    CHEMISTRY OF MATERIALS   Vol. 31 ( 16 ) page: 6276-6285   2019.8

     More details

  10. Preparation of zinc oxide with a three-dimensionally interconnected macroporous structure via a sol–gel method accompanied by phase separation

    Lu Xuanming, Kanamori Kazuyoshi, Nakanishi Kazuki

    NEW JOURNAL OF CHEMISTRY   Vol. 43 ( 29 ) page: 11720-11726   2019.8

     More details

    Language:English  

    DOI: 10.1039/c9nj02373a

    Web of Science

  11. Neuroprotective effects of different frequency preconditioning exercise on neuronal apoptosis after focal brain ischemia in rats Reviewed

    Terashi Takuto, Otsuka Shotaro, Takada Seiya, Nakanishi Kazuki, Ueda Koki, Sumizono Megumi, Kikuchi Kiyoshi, Sakakima Harutoshi

    NEUROLOGICAL RESEARCH   Vol. 41 ( 6 ) page: 510-518   2019.6

     More details

  12. Macroporous Niobium Phosphate-Supported Magnesia Catalysts for Isomerization of Glucose-to-Fructose

    Gao Da-Ming, Shen Yong-Bing, Zhao Bohan, Liu Qian, Nakanishi Kazuki, Chen Jie, Kanamori Kazuyoshi, Wu Huaping, He Zhiyong, Zeng Maomao, Liu Haichao

    ACS SUSTAINABLE CHEMISTRY & ENGINEERING   Vol. 7 ( 9 ) page: 8512-8521   2019.5

     More details

  13. Preparation of surface-coated macroporous silica (core-shell silica monolith) for HPLC separations

    Ito Risako, Morisato Kei, Kanamori Kazuyoshi, Nakanishi Kazuki

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 90 ( 1 ) page: 105-112   2019.4

     More details

  14. Correction to: Preconditioning exercise reduces brain damage and neuronal apoptosis through enhanced endogenous 14-3-3γ after focal brain ischemia in rats Reviewed

    Otsuka Shotaro, Sakakima Harutoshi, Terashi Takuto, Takada Seiya, Nakanishi Kazuki, Kikuchi Kiyoshi

    BRAIN STRUCTURE & FUNCTION   Vol. 224 ( 2 ) page: 739-740   2019.3

     More details

  15. Preconditioning exercise reduces brain damage and neuronal apoptosis through enhanced endogenous 14-3-3γ after focal brain ischemia in rats Reviewed

    Otsuka Shotaro, Sakakima Harutoshi, Terashi Takuto, Takada Seiya, Nakanishi Kazuki, Kikuchi Kiyoshi

    BRAIN STRUCTURE & FUNCTION   Vol. 224 ( 2 ) page: 727-738   2019.3

     More details

  16. Hybrid silicone aerogels toward unusual flexibility, functionality, and extended applications

    Kanamori Kazuyoshi, Ueoka Ryota, Kakegawa Takayuki, Shimizu Taiyo, Nakanishi Kazuki

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 89 ( 1 ) page: 166-175   2019.1

     More details

  17. Synthesis of hierarchically porous MgO monoliths with continuous structure via sol–gel process accompanied by phase separation

    Lu Xuanming, Kanamori Kazuyoshi, Nakanishi Kazuki

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 89 ( 1 ) page: 29-36   2019.1

     More details

  18. Sol-gel preparation of hierarchically porous magnesium aluminate (MgAl2O4) spinel monoliths for dye adsorption

    Guo Xingzhong, Yin Pengan, Kanamori Kazuyoshi, Nakanishi Kazuki, Yang Hui

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 88 ( 1 ) page: 114-128   2018.10

     More details

    Language:English   Publishing type:Rapid communication, short report, research note, etc. (scientific journal)  

    DOI: 10.1007/s10971-018-4781-0

    Web of Science

  19. On-line Redox Derivatization Liquid Chromatography Using a Carbon Monolithic Column

    Miyashita Ken, Tanaka Ryo, Hasegawa George, Nakanishi Kazuki, Morioka Kazuhiro, Zeng Hulie, Kato Shungo, Uchiyama Katsumi, Saitoh Kazunori, Shibukawa Masami, Nakajima Hizuru

    BUNSEKI KAGAKU   Vol. 67 ( 8 ) page: 469-478   2018.8

     More details

    Language:English  

    Web of Science

  20. Superflexible Multifunctional Polyvinylpolydimethylsiloxane-Based Aerogels as Efficient Absorbents, Thermal Superinsulators, and Strain Sensors

    Zu Guoqing, Kanamori Kazuyoshi, Maeno Ayaka, Kaji Hironori, Nakanishi Kazuki

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   Vol. 57 ( 31 ) page: 9722-9727   2018.7

     More details

    Language:English  

    DOI: 10.1002/anie.201804559

    Web of Science

  21. Synthesis of a hierarchically porous niobium phosphate monolith by a sol-gel method for fructose dehydration to 5-hydroxymethylfurfural

    Gao Da-Ming, Zhao Bohan, Liu Haichao, Morisato Kei, Kanamori Kazuyoshi, He Zhiyong, Zeng Maomao, Wu Huaping, Chen Jie, Nakanishi Kazuki

    CATALYSIS SCIENCE & TECHNOLOGY   Vol. 8 ( 14 ) page: 3675-3685   2018.7

     More details

    Language:English  

    DOI: 10.1039/c8cy00803e

    Web of Science

  22. Comprehensive studies on phosphoric acid treatment of porous titania toward titanium phosphate and pyrophosphate monoliths with pore hierarchy and a nanostructured pore surface

    Zhu Yang, Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki

    INORGANIC CHEMISTRY FRONTIERS   Vol. 5 ( 6 ) page: 1397-1404   2018.6

     More details

    Language:English  

    DOI: 10.1039/c8qi00146d

    Web of Science

  23. Iron(III) oxyhydroxide and oxide monoliths with controlled multiscale porosity: synthesis and their adsorption performance

    Hara Yosuke, Kanamori Kazuyoshi, Morisato Kei, Miyamoto Riichi, Nakanishi Kazuki

    JOURNAL OF MATERIALS CHEMISTRY A   Vol. 6 ( 19 ) page: 9041-9048   2018.5

     More details

    Language:English  

    DOI: 10.1039/c8ta01691g

    Web of Science

  24. Versatile Double-Cross-Linking Approach to Transparent, Machinable, Supercompressible, Highly Bendable Aerogel Thermal Superinsulators

    Zu Guoqing, Kanamori Kazuyoshi, Shimizu Taiyo, Zhu Yang, Maeno Ayaka, Kaji Hironori, Nakanishi Kazuki, Shen Jun

    CHEMISTRY OF MATERIALS   Vol. 30 ( 8 ) page: 2759-2770   2018.4

     More details

  25. 先生のための『発展』ケイ酸とケイ酸塩の化学―シロキサン結合をもつ分子・粒子・ゲル―

    中西和樹

    化学と教育   Vol. 66 ( 1 ) page: 26‐29   2018.1

     More details

    Language:Japanese  

    J-GLOBAL

  26. Transparent, Superflexible Doubly Cross-Linked Polyvinylpolymethylsiloxane Aerogel Superinsulators via Ambient Pressure Drying Reviewed

    Zu Guoqing, Shimizu Taiyo, Kanamori Kazuyoshi, Zhu Yang, Maeno Ayaka, Kaji Hironori, Shen Jun, Nakanishi Kazuki

    ACS NANO   Vol. 12 ( 1 ) page: 521-532   2018.1

     More details

    Language:English  

    DOI: 10.1021/acsnano.7b07117

    Web of Science

  27. Synthesis and characterization of monolithic ZnAl2O4 spinel with well-defined hierarchical pore structures via a sol-gel route Reviewed

    Guo Xingzhong, Yin Pengan, Lei Wei, Yang Hui, Kanamori Kazuyoshi, Nakanishi Kazuki

    JOURNAL OF ALLOYS AND COMPOUNDS   Vol. 727   page: 763-770   2017.12

     More details

  28. Polymer-assisted shapeable synthesis of porous frameworks consisting of silica nanoparticles with mechanical property tuning Reviewed

    Sato Kanako, Ishii Kanji, Oaki Yuya, Nakanishi Kazuki, Imai Hiroaki

    POLYMER JOURNAL   Vol. 49 ( 12 ) page: 825-830   2017.12

     More details

    Language:English  

    DOI: 10.1038/pj.2017.62

    Web of Science

  29. Synthesis, Reduction, and Electrical Properties of Macroporous Monolithic Mayenite Electrides with High Porosity Reviewed

    Wang Rui, Yang Hui, Lu Yunhao, Kanamori Kazuyoshi, Nakanishi Kazuki, Guo Xingzhong

    ACS OMEGA   Vol. 2 ( 11 ) page: 8148-8155   2017.11

     More details

    Language:English  

    DOI: 10.1021/acsomega.7b01121

    Web of Science

  30. Ultralow-Density, Transparent, Superamphiphobic Boehmite Nanofiber Aerogels and Their Alumina Derivatives (vol 27, pg 3, 2015) Reviewed

    Hayase Gen D, Nonomura Kazuya, Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki

    CHEMISTRY OF MATERIALS   Vol. 29 ( 12 ) page: 5413-5413   2017.6

     More details

  31. Fabrication of hydrophobic polymethylsilsesquioxane aerogels by a surfactant-free method using alkoxysilane with ionic group Reviewed

    Hayase Gen, Nagayama Shuya, Nonomura Kazuya, Kanamori Kazuyoshi, Maeno Ayaka, Kaji Hironori, Nakanishi Kazuki

    JOURNAL OF ASIAN CERAMIC SOCIETIES   Vol. 5 ( 2 ) page: 104-108   2017.6

     More details

  32. Functionalization of hierarchically porous silica monoliths with polyethyleneimine (PEI) for CO2 adsorption Reviewed

    Guo Xingzhong, Ding Li, Kanamori Kazuyoshi, Nakanishi Kazuki, Yang Hui

    MICROPOROUS AND MESOPOROUS MATERIALS   Vol. 245   page: 51-57   2017.6

     More details

  33. Transparent Ethenylene-Bridged Polymethylsiloxane Aerogels: Mechanical Flexibility and Strength and Availability for Addition Reaction Reviewed

    Shimizu Taiyo, Kanamori Kazuyoshi, Maeno Ayaka, Kaji Hironori, Doherty Cara M., Nakanishi Kazuki

    LANGMUIR   Vol. 33 ( 18 ) page: 4543-4550   2017.5

     More details

  34. Silicone-Based Organic-Inorganic Hybrid Aerogels and Xerogels Reviewed

    Shimizu Taiyo, Kanamori Kazuyoshi, Nakanishi Kazuki

    CHEMISTRY-A EUROPEAN JOURNAL   Vol. 23 ( 22 ) page: 5176-5187   2017.4

     More details

    Language:English  

    DOI: 10.1002/chem.201603680

    Web of Science

  35. Transparent polyvinylsilsesquioxane aerogels: investigations on synthetic parameters and surface modification Reviewed

    Shimizu Taiyo, Kanamori Kazuyoshi, Nakanishi Kazuki

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 82 ( 1 ) page: 2-14   2017.4

     More details

  36. Highly Flexible Hybrid Polymer Aerogels and Xerogels Based on Resorcinol-Formaldehyde with Enhanced Elastic Stiffness and Recoverability: Insights into the Origin of Their Mechanical Properties Reviewed

    Hasegawa George, Shimizu Taiyo, Kanamori Kazuyoshi, Maeno Ayaka, Kaji Hironori, Nakanishi Kazuki

    CHEMISTRY OF MATERIALS   Vol. 29 ( 5 ) page: 2122-2134   2017.3

     More details

  37. Grafted Polymethylhydrosiloxane on Hierarchically Porous Silica Monoliths: A New Path to Monolith-Supported Palladium Nanoparticles for Continuous Flow Catalysis Applications Reviewed

    Pelisson Carl-Hugo, Nakanishi Takahiro, Zhu Yang, Morisato Kei, Kamei Toshiyuki, Maeno Ayaka, Kaji Hironori, Muroyama Shunki, Tafu Masamoto, Kanamori Kazuyoshi, Shimada Toyoshi, Nakanishi Kazuki

    ACS APPLIED MATERIALS & INTERFACES   Vol. 9 ( 1 ) page: 406-412   2017.1

     More details

    Language:English  

    DOI: 10.1021/acsami.6b12653

    Web of Science

  38. Low-density, transparent aerogels and xerogels based on hexylene-bridged polysilsesquioxane with bendability Reviewed

    Aoki Yosuke, Shimizu Taiyo, Kanamori Kazuyoshi, Maeno Ayaka, Kaji Hironori, Nakanishi Kazuki

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 81 ( 1 ) page: 42-51   2017.1

     More details

  39. Edaravone, a Synthetic Free Radical Scavenger, Enhances Alteplase-Mediated Thrombiolysis Reviewed

    Kikuchi Kiyoshi, Setoyama Kentaro, Kawahara Ko-ichi, Nagasato Tomoka, Terashi Takuto, Ueda Koki, Nakanishi Kazuki, Otsuka Shotaro, Miura Naoki, Sameshima Hisayo, Hosokawa Kazuya, Harada Yoichiro, Shrestha Binita, Yamamoto Mika, Morimoto-Yamashita Yoko, Kikuchi Haruna, Kiyama Ryoji, Kamikokuryo Chinatsu, Tancharoen Salunya, Sakakima Harutoshi, Morioka Motohiro, Tanaka Eiichiro, Ito Takashi, Maruyama Ikuro

    OXIDATIVE MEDICINE AND CELLULAR LONGEVITY   Vol. 2017   2017

     More details

    Language:English  

    DOI: 10.1155/2017/6873281

    Web of Science

  40. Effects of nanostructured biosilica on rice plant mechanics Reviewed

    Sato Kanako, Ozaki Noriaki, Nakanishi Kazuki, Sugahara Yoshiyuki, Oaki Yuya, Salinas Christopher, Herrera Steven, Kisailus David, Imai Hiroaki

    RSC ADVANCES   Vol. 7 ( 22 ) page: 13065-13071   2017

     More details

    Language:English  

    DOI: 10.1039/c6ra27317c

    Web of Science

  41. Highly Efficient Encapsulation of Ingredients in Poly(methyl methacrylate) Capsules Using a Superoleophobic Material Reviewed

    Takei Takayuki, Araki Kiyotaka, Terazono Keita, Ozuno Yoshihiro, Hayase Gen, Kanamori Kazuyoshi, Nakanishi Kazuki, Yoshida Masahiro

    POLYMERS & POLYMER COMPOSITES   Vol. 25 ( 2 ) page: 129-134   2017

     More details

    Language:English  

    Web of Science

  42. Transparent Ethylene-Bridged Polymethylsiloxane Aerogels and Xerogels with Improved Bending Flexibility Reviewed

    Shimizu Taiyo, Kanamori Kazuyoshi, Maeno Ayaka, Kaji Hironori, Nakanishi Kazuki

    LANGMUIR   Vol. 32 ( 50 ) page: 13427-13434   2016.12

     More details

  43. Monolithic acidic catalysts for the dehydration of xylose into furfural

    Zhu Yang, Kanamori Kazuyoshi, Brun Nicolas, Pelisson Carl-Hugo, Moitra Nirmalya, Fajula Francois, Hulea Vasile, Galarneau Anne, Takeda Kazuyuki, Nakanishi Kazuki

    CATALYSIS COMMUNICATIONS   Vol. 87   page: 112-115   2016.12

     More details

  44. Transparent, Highly Insulating Polyethyl- and Polyvinylsilsesquioxane Aerogels: Mechanical Improvements by Vulcanization for Ambient Pressure Drying

    Shimizu Taiyo, Kanamori Kazuyoshi, Maeno Ayaka, Kaji Hironori, Doherty Cara M., Falcaro Paolo, Nakanishi Kazuki

    CHEMISTRY OF MATERIALS   Vol. 28 ( 19 ) page: 6860-6868   2016.10

     More details

  45. The XVIII International Sol-Gel Conference: Sol-Gel 2015 was held in Kyoto, Japan, September 6-11, 2015

    Nakanishi Kazuki

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 79 ( 2 ) page: 241-241   2016.8

     More details

  46. Facile preparation of well-defined macroporous yttria-stabilized zirconia monoliths via sol-gel process accompanied by phase separation

    Guo Xingzhong, Song Jie, Ren Jing, Yang Fanger, Kanamori Kazuyoshi, Nakanishi Kazuki

    JOURNAL OF POROUS MATERIALS   Vol. 23 ( 4 ) page: 867-875   2016.8

     More details

  47. Studies on electrochemical sodium storage into hard carbons with binder-free monolithic electrodes

    Hasegawa George, Kanamori Kazuyoshi, Kannari Naokatsu, Ozaki Jun-ichi, Nakanishi Kazuki, Abe Takeshi

    JOURNAL OF POWER SOURCES   Vol. 318   page: 41-48   2016.6

     More details

  48. Hierarchically Porous Carbon Monoliths Comprising Ordered Mesoporous Nanorod Assemblies for High-Voltage Aqueous Supercapacitors

    Hasegawa George, Kanamori Kazuyoshi, Kiyomura Tsutomu, Kurata Hiroki, Abe Takeshi, Nakanishi Kazuki

    CHEMISTRY OF MATERIALS   Vol. 28 ( 11 ) page: 3944-3950   2016.6

     More details

  49. Boehmite Nanofiber-Polymethylsilsesquioxane Core-Shell Porous Monoliths for a Thermal Insulator under Low Vacuum Conditions

    Hayase Gen, Nonomura Kazuya, Kanamori Kazuyoshi, Maeno Ayaka, Kaji Hironori, Nakanishi Kazuki

    CHEMISTRY OF MATERIALS   Vol. 28 ( 10 ) page: 3237-3240   2016.5

     More details

  50. Metal zirconium phosphate macroporous monoliths: Versatile synthesis, thermal expansion and mechanical properties

    Zhu Yang, Kanamori Kazuyoshi, Moitra Nirmalya, Kadono Kohei, Ohi Shugo, Shimobayashi Norimasa, Nakanishi Kazuki

    MICROPOROUS AND MESOPOROUS MATERIALS   Vol. 225   page: 122-127   2016.5

     More details

  51. Dynamic spring-back behavior in evaporative drying of polymethylsilsesquioxane monolithic gels for low-density transparent thermal superinsulators Reviewed

    Hayase Gen, Kanamori Kazuyoshi, Maeno Ayaka, Kaji Hironori, Nakanishi Kazuki

    JOURNAL OF NON-CRYSTALLINE SOLIDS   Vol. 434   page: 115-119   2016.2

     More details

  52. Encapsulation of hydrophobic ingredients in hard resin capsules with ultrahigh efficiency using a superoleophobic material

    Takei Takayuki, Terazono Keita, Araki Kiyotaka, Ozuno Yoshihiro, Hayase Gen, Kanamori Kazuyoshi, Nakanishi Kazuki, Yoshida Masahiro

    POLYMER BULLETIN   Vol. 73 ( 2 ) page: 409-417   2016.2

     More details

  53. The chromatographic performance of flow-through particles: A computational fluid dynamics study Reviewed

    Smits Wim, Nakanishi Kazuki, Desmet Gert

    JOURNAL OF CHROMATOGRAPHY A   Vol. 1429   page: 166-174   2016.1

     More details

  54. Hierarchically porous titanium phosphate monoliths and their crystallization behavior in ethylene glycol

    Zhu Yang, Yoneda Koji, Kanamori Kazuyoshi, Takeda Kazuyuki, Kiyomura Tsutomu, Kurata Hiroki, Nakanishi Kazuki

    NEW JOURNAL OF CHEMISTRY   Vol. 40 ( 5 ) page: 4153-4159   2016

     More details

    Language:English  

    DOI: 10.1039/c5nj02820e

    Web of Science

  55. Hard Carbon Anodes for Na-Ion Batteries: Toward a Practical Use Reviewed

    Hasegawa George, Kanamori Kazuyoshi, Kannari Naokatsu, Ozaki Jun-ichi, Nakanishi Kazuki, Abe Takeshi

    CHEMELECTROCHEM   Vol. 2 ( 12 ) page: 1917-1920   2015.12

     More details

    Language:English  

    DOI: 10.1002/celc.201500412

    Web of Science

  56. Synthesis of hierarchically porous polymethylsilsesquioxane monoliths with controlled mesopores for HPLC separation Reviewed

    Zhu Yang, Morimoto Yoshie, Shimizu Taiyo, Morisato Kei, Takeda Kazuyuki, Kanamori Kazuyoshi, Nakanishi Kazuki

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   Vol. 123 ( 1441 ) page: 770-778   2015.9

     More details

    Language:English  

    Web of Science

  57. Novel soft touch silicone beads from methyltrimethoxysilane and dimethyldimethoxysilane using easy aqueous solution reaction Reviewed

    Tsuchiya Reiichiro, Tanaka Takumi, Hayase Gen, Kanamori Kazuyoshi, Nakanishi Kazuki

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   Vol. 123 ( 1441 ) page: 714-718   2015.9

     More details

    Language:English  

    DOI: 10.2109/jcersj2.123.714

    Web of Science

  58. High-performance liquid chromatography separation of unsaturated organic compounds by a monolithic silica column embedded with silver nanoparticles Reviewed

    Zhu Yang, Morisato Kei, Hasegawa George, Moitra Nirmalya, Kiyomura Tsutomu, Kurata Hiroki, Kanamori Kazuyoshi, Nakanishi Kazuki

    JOURNAL OF SEPARATION SCIENCE   Vol. 38 ( 16 ) page: 2841-2847   2015.8

     More details

    Language:English  

    DOI: 10.1002/jssc.201500444

    Web of Science

  59. High-Level Doping of Nitrogen, Phosphorus, and Sulfur into Activated Carbon Monoliths and Their Electrochemical Capacitances Reviewed

    Hasegawa George, Deguchi Takeru, Kanamori Kazuyoshi, Kobayashi Yoji, Kageyama Hiroshi, Abe Takeshi, Nakanishi Kazuki

    CHEMISTRY OF MATERIALS   Vol. 27 ( 13 ) page: 4703-4712   2015.7

     More details

  60. Effect of Calcination Conditions on Porous Reduced Titanium Oxides and Oxynitrides via a Preceramic Polymer Route (vol 54, pg 2802, 2015) Reviewed

    Hasegawa George, Sato Tatsuya, Kanamori Kazuyoshi, Sun Cheng-Jun, Ren Yang, Kobayashi Yoji, Kageyama Hiroshi, Abe Takeshi, Nakanishi Kazuki

    INORGANIC CHEMISTRY   Vol. 54 ( 11 ) page: 5614-5614   2015.6

     More details

  61. Preparation of macroporous zirconia monoliths from ionic precursors via an epoxide-mediated sol-gel process accompanied by phase separation Reviewed

    Guo Xingzhong, Song Jie, Lvlin Yixiu, Nakanishi Kazuki, Kanamori Kazuyoshi, Yang Hui

    SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS   Vol. 16 ( 2 )   2015.4

     More details

  62. Effect of Calcination Conditions on Porous Reduced Titanium Oxides and Oxynitrides via a Preceramic Polymer Route Reviewed

    Hasegawa George, Sato Tatsuya, Kanamori Kazuyoshi, Sun Cheng-Jun, Ren Yang, Kobayashi Yoji, Kageyama Hiroshi, Abe Takeshi, Nakanishi Kazuki

    INORGANIC CHEMISTRY   Vol. 54 ( 6 ) page: 2802-2808   2015.3

     More details

    Language:English  

    DOI: 10.1021/ic502972v

    Web of Science

  63. Efficiency of short, small-diameter columns for reversed-phase liquid chromatography under practical operating conditions

    Ma Yan, Chassy Alexander W., Miyazaki Shota, Motokawa Masanori, Morisato Kei, Uzu Hideyuki, Ohira Masayoshi, Furuno Masahiro, Nakanishi Kazuki, Minakuchi Hiroyoshi, Mriziq Khaled, Farkas Tivadar, Fiehn Oliver, Tanaka Nobuo

    JOURNAL OF CHROMATOGRAPHY A   Vol. 1383   page: 47-57   2015.2

     More details

  64. Ultralow-Density, Transparent, Superamphiphobic Boehmite Nanofiber Aerogels and Their Alumina Derivatives Reviewed

    Hayase Gen, Nonomura Kazuya, Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki

    CHEMISTRY OF MATERIALS   Vol. 27 ( 1 ) page: 3-5   2015.1

     More details

    Language:English  

    DOI: 10.1021/cm503993n

    Web of Science

  65. Hierarchically Porous Li4Ti5O12 Anode Materials for Li- and Na-Ion Batteries: Effects of Nanoarchitectural Design and Temperature Dependence of the Rate Capability Reviewed

    Hasegawa George, Kanamori Kazuyoshi, Kiyomura Tsutomu, Kurata Hiroki, Nakanishi Kazuki, Abe Takeshi

    ADVANCED ENERGY MATERIALS   Vol. 5 ( 1 )   2015.1

     More details

    Language:English  

    DOI: 10.1002/aenm.201400730

    Web of Science

  66. Mesoscopic superstructures of flexible porous coordination polymers synthesized via coordination replication Reviewed

    Sumida Kenji, Moitra Nirmalya, Reboul Julien, Fukumoto Shotaro, Nakanishi Kazuki, Kanamori Kazuyoshi, Furukawa Shuhei, Kitagawa Susumu

    CHEMICAL SCIENCE   Vol. 6 ( 10 ) page: 5938-5946   2015

     More details

    Language:English  

    DOI: 10.1039/c5sc02034d

    Web of Science

  67. Impact of Electrolyte on Pseudocapacitance and Stability of Porous Titanium Nitride (TiN) Monolithic Electrode Reviewed

    Hasegawa George, Kitada Atsushi, Kawasaki Shota, Kanamori Kazuyoshi, Nakanishi Kazuki, Kobayashi Yoji, Kageyama Hiroshi, Abe Takeshi

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   Vol. 162 ( 1 ) page: A77-A85   2015

     More details

    Language:English  

    DOI: 10.1149/2.0491501jes

    Web of Science

  68. Mechanically stable, hierarchically porous Cu-3(btc)(2) (HKUST-1) monoliths via direct conversion of copper(II) hydroxide-based monoliths Reviewed

    Moitra Nirmalya, Fukumoto Shotaro, Reboul Julien, Sumida Kenji, Zhu Yang, Nakanishi Kazuki, Furukawa Shuhei, Kitagawa Susumu, Kanamori Kazuyoshi

    CHEMICAL COMMUNICATIONS   Vol. 51 ( 17 ) page: 3511-3514   2015

     More details

    Language:English  

    DOI: 10.1039/c4cc09694k

    Web of Science

  69. Sol-gel synthesis of nanocrystal-constructed hierarchically porous TiO2 based composites for lithium ion batteries Reviewed

    Zhu Wenjun, Yang Hui, Nakanishi Kazuki, Kanamori Kazuyoshi, Guo Xingzhong

    RSC ADVANCES   Vol. 5 ( 31 ) page: 24803-24813   2015

     More details

    Language:English  

    DOI: 10.1039/c5ra03491d

    Web of Science

  70. Synthesis of robust hierarchically porous zirconium phosphate monolith for efficient ion adsorption Reviewed

    Zhu Yang, Shimizu Taiyo, Kitajima Takara, Morisato Kei, Moitra Nirmalya, Brun Nicolas, Kiyomura Tsutomu, Kanamori Kazuyoshi, Takeda Kazuyuki, Kurata Hiroki, Tafu Masamoto, Nakanishi Kazuki

    NEW JOURNAL OF CHEMISTRY   Vol. 39 ( 4 ) page: 2444-2450   2015

     More details

    Language:English  

    DOI: 10.1039/c4nj01749h

    Web of Science

  71. Fabrication of hierarchically porous monolithic layered double hydroxide composites with tunable microcages for effective oxyanion adsorption Reviewed

    Tarutani Naoki, Tokudome Yasuaki, Fukui Megu, Nakanishi Kazuki, Takahashi Masahide

    RSC ADVANCES   Vol. 5 ( 70 ) page: 57187-57192   2015

     More details

    Language:English  

    DOI: 10.1039/c5ra05942a

    Web of Science

  72. Spontaneous preparation of hierarchically porous silica monoliths with uniform spherical mesopores confined in a well-defined macroporous framework Reviewed

    Guo Xingzhong, Wang Rui, Yu Huan, Zhu Yang, Nakanishi Kazuki, Kanamori Kazuyoshi, Yang Hui

    DALTON TRANSACTIONS   Vol. 44 ( 30 ) page: 13592-13601   2015

     More details

    Language:English  

    DOI: 10.1039/c5dt01672j

    Web of Science

  73. Preparation of silver nanoparticles embedded hierarchically porous AlPO4 monoliths Reviewed

    Cai Xiaobo, Zhu Wenjun, Yang Hui, Xu Chenyang, Nakanishi Kazuki, Kanamori Kazuyoshi, Guo Xingzhong

    NEW JOURNAL OF CHEMISTRY   Vol. 39 ( 8 ) page: 6238-6243   2015

     More details

    Language:English  

    DOI: 10.1039/c5nj00490j

    Web of Science

  74. Direct preparation and conversion of copper hydroxide-based monolithic xerogels with hierarchical pores Reviewed

    Fukumoto Shotaro, Nakanishi Kazuki, Kanamori Kazuyoshi

    NEW JOURNAL OF CHEMISTRY   Vol. 39 ( 9 ) page: 6771-6777   2015

     More details

    Language:English  

    DOI: 10.1039/c5nj00479a

    Web of Science

  75. Facile preparation of silver nanoparticles homogeneously immobilized in hierarchically monolithic silica using ethylene glycol as reductant Reviewed

    Yu Huan, Zhu Yang, Yang Hui, Nakanishi Kazuki, Kanamori Kazuyoshi, Guo Xingzhong

    DALTON TRANSACTIONS   Vol. 43 ( 33 ) page: 12648-12656   2014.9

     More details

    Language:English  

    DOI: 10.1039/C4DT00655K

    Web of Science

  76. Surface Functionalization of Silica by Si-H Activation of Hydrosilanes Reviewed

    Moitra Nirmalya, Ichii Shun, Kamei Toshiyuki, Kanamori Kazuyoshi, Zhu Yang, Takeda Kazuyuki, Nakanishi Kazuki, Shimada Toyoshi

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   Vol. 136 ( 33 ) page: 11570-11573   2014.8

     More details

    Language:English  

    DOI: 10.1021/ja504115d

    Web of Science

  77. Experimental and numerical validation of the effective medium theory for the B-term band broadening in 1st and 2nd generation monolithic silica columns Reviewed

    Deridder Sander, Vanmessen Alison, Nakanishi Kazuki, Desmet Gert, Cabooter Deirdre

    JOURNAL OF CHROMATOGRAPHY A   Vol. 1351   page: 46-55   2014.7

     More details

  78. Polymethylsilsesquioxane-Cellulose Nanofiber Biocomposite Aerogels with High Thermal Insulation, Bendability, and Superhydrophobicity Reviewed

    Hayase Gen, Kanamori Kazuyoshi, Abe Kentaro, Yano Hiroyuki, Maeno Ayaka, Kaji Hironori, Nakanishi Kazuki

    ACS APPLIED MATERIALS & INTERFACES   Vol. 6 ( 12 ) page: 9466-9471   2014.6

     More details

    Language:English  

    DOI: 10.1021/am501822y

    Web of Science

  79. Fabrication of nitrogen-doped TiO2 monolith with well-defined macroporous and bicrystalline framework and its photocatalytic performance under visible light Reviewed

    Ruzimuradov Olim, Nurmanov Suvankul, Hojamberdiev Mirabbos, Prasad Ravi Mohan, Gurlo Aleksander, Broetz Joachim, Nakanishi Kazuki, Riedel Ralf

    JOURNAL OF THE EUROPEAN CERAMIC SOCIETY   Vol. 34 ( 3 ) page: 809-816   2014.3

     More details

  80. Preparation of macroporous cordierite monoliths via the sol-gel process accompanied by phase separation Reviewed

    Guo Xingzhong, Nakanishi Kazuki, Kanamori Kazuyoshi, Zhu Yang, Yang Hui

    JOURNAL OF THE EUROPEAN CERAMIC SOCIETY   Vol. 34 ( 3 ) page: 817-823   2014.3

     More details

  81. Preparation and characterization of macroporous TiO2-SrTiO3 heterostructured monolithic photocatalyst Reviewed

    Ruzimuradov Ohm, Nurmanov Suvankul, Hojamberdiev Mirabbos, Prasad Ravi Mohan, Gurlo Alexander, Broetz Joachim, Nakanishi Kazuki, Riedel Ralf

    MATERIALS LETTERS   Vol. 116   page: 353-355   2014.2

     More details

  82. Detailed characterization of the kinetic performance of first and second generation silica monolithic columns for reversed-phase chromatography separations Reviewed

    Cabooter Deirdre, Broeckhoven Ken, Sterken Roman, Vanmessen Alison, Vandendael Isabelle, Nakanishi Kazuki, Deridder Sander, Desmet Gert

    JOURNAL OF CHROMATOGRAPHY A   Vol. 1325   page: 72-82   2014.1

     More details

  83. Reduction on reactive pore surfaces as a versatile approach to synthesize monolith-supported metal alloy nanoparticles and their catalytic applications Reviewed

    Moitra Nirmalya, Kanamori Kazuyoshi, Ikuhara Yumi H., Gao Xiang, Zhu Yang, Hasegawa George, Takeda Kazuyuki, Shimada Toyoshi, Nakanishi Kazuki

    JOURNAL OF MATERIALS CHEMISTRY A   Vol. 2 ( 31 ) page: 12535-12544   2014

     More details

    Language:English  

    DOI: 10.1039/c4ta01767f

    Web of Science

  84. Porous chromium-based ceramic monoliths: oxides (Cr2O3), nitrides (CrN), and carbides (Cr3C2) Reviewed

    Kido Yasuki, Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki

    JOURNAL OF MATERIALS CHEMISTRY A   Vol. 2 ( 3 ) page: 745-752   2014

     More details

    Language:English  

    DOI: 10.1039/c3ta13725b

    Web of Science

  85. A new hierarchically porous Pd@HSQ monolithic catalyst for Mizoroki-Heck cross-coupling reactions Reviewed

    Moitra Nirmalya, Matsushima Ayumi, Kamei Toshiyuki, Kanamori Kazuyoshi, Ikuhara Yumi H., Gao Xiang, Takeda Kazuyuki, Zhu Yang, Nakanishi Kazuki, Shimada Toyoshi

    NEW JOURNAL OF CHEMISTRY   Vol. 38 ( 3 ) page: 1144-1149   2014

     More details

    Language:English  

    DOI: 10.1039/c3nj01433a

    Web of Science

  86. Synthesis and electrochemical performance of hierarchically porous N-doped TiO2 for Li-ion batteries Reviewed

    Hasegawa George, Sato Tatsuya, Kanamori Kazuyoshi, Nakanishi Kazuki, Abe Takeshi

    NEW JOURNAL OF CHEMISTRY   Vol. 38 ( 4 ) page: 1380-1384   2014

     More details

    Language:English  

    DOI: 10.1039/c3nj01332d

    Web of Science

  87. Layered double hydroxide composite monoliths with three-dimensional hierarchical channels: structural control and adsorption behavior Reviewed

    Tarutani Naoki, Tokudome Yasuaki, Nakanishi Kazuki, Takahashi Masahide

    RSC ADVANCES   Vol. 4 ( 31 ) page: 16075-16080   2014

     More details

    Language:English  

    DOI: 10.1039/c4ra00873a

    Web of Science

  88. Pore structure control of macroporous methylsilsesquioxane monoliths prepared by in situ two-step processing Reviewed

    Guo Xingzhong, Yu Huan, Yang Hui, Kanamori Kazuyoshi, Zhu Yang, Nakanishi Kazuki

    JOURNAL OF POROUS MATERIALS   Vol. 20 ( 6 ) page: 1477-1483   2013.12

     More details

  89. A Superamphiphobic Macroporous Silicone Monolith with Marshmallow-like Flexibility Reviewed

    Hayase Gen, Kanamori Kazuyoshi, Hasegawa George, Maeno Ayaka, Kaji Hironori, Nakanishi Kazuki

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   Vol. 52 ( 41 ) page: 10788-10791   2013.10

     More details

    Language:English  

    DOI: 10.1002/anie.201304169

    Web of Science

  90. Recyclable Functionalization of Silica with Alcohols via Dehydrogenative Addition on Hydrogen Silsesquioxane Reviewed

    Moitra Nirmalya, Kamei Toshiyuki, Kanamori Kazuyoshi, Nakanishi Kazuki, Takeda Kazuyuki, Shimada Toyoshi

    LANGMUIR   Vol. 29 ( 39 ) page: 12243-12253   2013.10

     More details

    Language:English  

    DOI: 10.1021/la402205j

    Web of Science

  91. Hierarchically Porous Monoliths Based on N-Doped Reduced Titanium Oxides and Their Electric and Electrochemical Properties Reviewed

    Hasegawa George, Sato Tatsuya, Kanamori Kazuyoshi, Nakano Kousuke, Yajima Takeshi, Kobayashi Yoji, Kageyama Hiroshi, Abe Takeshi, Nakanishi Kazuki

    CHEMISTRY OF MATERIALS   Vol. 25 ( 17 ) page: 3504-3512   2013.9

     More details

    Language:English  

    DOI: 10.1021/cm401933a

    Web of Science

  92. Sol-gel synthesis of macroporous TiO2 from ionic precursors via phase separation route Reviewed

    Li Wenyan, Guo Xingzhong, Zhu Yang, Hui Yang, Kanamori Kazuyoshi, Nakanishi Kazuki

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 67 ( 3 ) page: 639-645   2013.9

     More details

  93. Preparation of mullite monoliths with well-defined macropores and mesostructured skeletons via the sol-gel process accompanied by phase separation Reviewed

    Guo Xingzhong, Li Wenyan, Nakanishi Kazuki, Kanamori Kazuyoshi, Zhu Yang, Yang Hui

    JOURNAL OF THE EUROPEAN CERAMIC SOCIETY   Vol. 33 ( 10 ) page: 1967-1974   2013.9

     More details

  94. Preparation of a hierarchically porous AlPO4 monolith via an epoxide-mediated sol-gel process accompanied by phase separation Reviewed

    Li Wenyan, Zhu Yang, Guo Xingzhong, Nakanishi Kazuki, Kanamori Kazuyoshi, Yang Hui

    SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS   Vol. 14 ( 4 )   2013.8

     More details

  95. Hierarchically porous nickel/carbon composite monoliths prepared by sol-gel method from an ionic precursor Reviewed

    Kido Yasuki, Nakanishi Kazuki, Okumura Nao, Kanamori Kazuyoshi

    MICROPOROUS AND MESOPOROUS MATERIALS   Vol. 176   page: 64-70   2013.8

     More details

  96. Synthesis of Hierarchically Porous Hydrogen Silsesquioxane Monoliths and Embedding of Metal Nanoparticles by On-Site Reduction Reviewed

    Moitra Nirmalya, Kanamori Kazuyoshi, Shimada Toyoshi, Takeda Kazuyuki, Ikuhara Yumi H., Gao Xiang, Nakanishi Kazuki

    ADVANCED FUNCTIONAL MATERIALS   Vol. 23 ( 21 ) page: 2714-2722   2013.6

     More details

    Language:English  

    DOI: 10.1002/adfm.201202558

    Web of Science

  97. Fabrication of large-sized silica monolith exceeding 1000 mL with high structural homogeneity Reviewed

    Miyamoto Riichi, Ando Yukiko, Kurusu Chie, Bai Hong-zhi, Nakanishi Kazuki, Ippommatsu Masamichi

    JOURNAL OF SEPARATION SCIENCE   Vol. 36 ( 12 ) page: 1890-1896   2013.6

     More details

    Language:English  

    DOI: 10.1002/jssc.201300123

    Web of Science

  98. Synthesis of Silver Nanoparticles Confined in Hierarchically Porous Monolithic Silica: A New Function in Aromatic Hydrocarbon Separations Reviewed

    Zhu Yang, Morisato Kei, Li Wenyan, Kanamori Kazuyoshi, Nakanishi Kazuki

    ACS APPLIED MATERIALS & INTERFACES   Vol. 5 ( 6 ) page: 2118-2125   2013.3

     More details

    Language:English  

    DOI: 10.1021/am303163s

    Web of Science

  99. Macroporous SiO2 Monoliths Prepared via Sol-Gel Process Accompanied by Phase Separation Reviewed

    Guo Xing-Zhong, Li Wen-Yan, Zhu Yang, Nakanishi Kazuki, Kanamori Kazuyoshi, Yang Hui

    ACTA PHYSICO-CHIMICA SINICA   Vol. 29 ( 3 ) page: 646-652   2013.3

     More details

  100. Hierarchically Porous Monoliths of Oxygen-deficient Anatase TiO2-x with Electronic Conductivity (vol 3, pg 7205, 2013) Reviewed

    Kitada Atsushi, Hasegawa George, Kobayashi Yoji, Miyazaki Kohei, Abe Takeshi, Kanamori Kazuyoshi, Nakanishi Kazuki, Kageyama Hiroshi

    RSC ADVANCES   Vol. 3 ( 48 ) page: 26475-26475   2013

     More details

    Language:English  

    Web of Science

  101. Facile Synthesis of Marshmallow-like Macroporous Gels Usable under Harsh Conditions for the Separation of Oil and Water Reviewed

    Hayase Gen, Kanamori Kazuyoshi, Fukuchi Masashi, Kaji Hironori, Nakanishi Kazuki

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   Vol. 52 ( 7 ) page: 1986-1989   2013

     More details

    Language:English  

    DOI: 10.1002/anie.201207969

    Web of Science

  102. Sol-gel synthesis of zinc ferrite-based xerogel monoliths with well-defined macropores Reviewed

    Kido Yasuki, Nakanishi Kazuki, Kanamori Kazuyoshi

    RSC ADVANCES   Vol. 3 ( 11 ) page: 3661-3666   2013

     More details

    Language:English  

    DOI: 10.1039/c3ra22481c

    Web of Science

  103. New Li2FeSiO4-carbon monoliths with controlled macropores: effects of pore properties on electrode performance Reviewed

    Hasegawa George, Sannohe Mai, Ishihara Yuya, Kanamori Kazuyoshi, Nakanishi Kazuki, Abe Takeshi

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   Vol. 15 ( 22 ) page: 8736-8743   2013

     More details

    Language:English  

    DOI: 10.1039/c3cp50352f

    Web of Science

  104. Hierarchically porous monoliths of oxygen-deficient anatase TiO2-x with electronic conductivity Reviewed

    Kitada Atsushi, Hasegawa George, Kobayashi Yoji, Miyazaki Kohei, Abe Takeshi, Kanamori Kazuyoshi, Nakanishi Kazuki, Kageyama Hiroshi

    RSC ADVANCES   Vol. 3 ( 20 ) page: 7205-7208   2013

     More details

    Language:English  

    DOI: 10.1039/c3ra40545a

    Web of Science

  105. Layered double hydroxide (LDH)-based monolith with interconnected hierarchical channels: enhanced sorption affinity for anionic species Reviewed

    Tokudome Yasuaki, Tarutani Naoki, Nakanishi Kazuki, Takahashi Masahide

    JOURNAL OF MATERIALS CHEMISTRY A   Vol. 1 ( 26 ) page: 7702-7708   2013

     More details

    Language:English  

    DOI: 10.1039/c3ta11110e

    Web of Science

  106. New Insights into the Relationship between Micropore Properties, Ionic Sizes, and Electric Double-Layer Capacitance in Monolithic Carbon Electrodes Reviewed

    Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki, Abe Takeshi

    JOURNAL OF PHYSICAL CHEMISTRY C   Vol. 116 ( 50 ) page: 26197-26203   2012.12

     More details

    Language:English  

    DOI: 10.1021/jp309010p

    Web of Science

  107. Structure and properties of polymethylsilsesquioxane aerogels synthesized with surfactant n-hexadecyltrimethylammonium chloride Reviewed

    Hayase Gen, Kanamori Kazuyoshi, Nakanishi Kazuki

    MICROPOROUS AND MESOPOROUS MATERIALS   Vol. 158   page: 247-252   2012.8

     More details

  108. Selective Preparation of Macroporous Monoliths of Conductive Titanium Oxides TinO2n-1 (n=2, 3, 4, 6) Reviewed

    Kitada Atsushi, Hasegawa George, Kobayashi Yoji, Kanamori Kazuyoshi, Nakanishi Kazuki, Kageyama Hiroshi

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   Vol. 134 ( 26 ) page: 10894-10898   2012.7

     More details

    Language:English  

    DOI: 10.1021/ja302083n

    Web of Science

  109. Synthesis of Monolithic Hierarchically Porous Iron-Based Xerogels from Iron(III) Salts via an Epoxide-Mediated Sol-Gel Process Reviewed

    Kido Yasuki, Nakanishi Kazuki, Miyasaka Akira, Kanamori Kazuyoshi

    CHEMISTRY OF MATERIALS   Vol. 24 ( 11 ) page: 2071-2077   2012.6

     More details

    Language:English  

    DOI: 10.1021/cm300495j

    Web of Science

  110. Facile preparation of macroporous graphitized carbon monoliths from iron-containing resorcinol-formaldehyde gels Reviewed

    Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki

    MATERIALS LETTERS   Vol. 76   page: 1-4   2012.6

     More details

  111. Pore properties of hierarchically porous carbon monoliths with high surface area obtained from bridged polysilsesquioxanes Reviewed

    Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki

    MICROPOROUS AND MESOPOROUS MATERIALS   Vol. 155   page: 265-273   2012.6

     More details

  112. Flower-like surface modification of titania materials by lithium hydroxide solution Reviewed

    Hasegawa George, Kanamori Kazuyoshi, Sugawara Yoshihiro, Ikuhara Yuichi, Nakanishi Kazuki

    JOURNAL OF COLLOID AND INTERFACE SCIENCE   Vol. 374   page: 291-296   2012.5

     More details

  113. New Monolithic Capillary Columns with Well-Defined Macropores Based on Poly(styrene-co-divinylbenzene) Reviewed

    Hasegawa George, Kanamori Kazuyoshi, Ishizuka Norio, Nakanishi Kazuki

    ACS APPLIED MATERIALS & INTERFACES   Vol. 4 ( 5 ) page: 2343-2347   2012.5

     More details

    Language:English  

    DOI: 10.1021/am300552q

    Web of Science

  114. Hierarchically Porous Materials by Phase Separation: Monoliths

    Nakanishi Kazuki

    HIERARCHICALLY STRUCTURED POROUS MATERIALS: FROM NANOSCIENCE TO CATALYSIS, SEPARATION, OPTICS, ENERGY, AND LIFE SCIENCE     page: 241-267   2012

     More details

    Language:English  

    Web of Science

  115. Hierarchically Structured Porous Materials: Application to Separation Sciences Reviewed

    Nakanishi Kazuki

    HIERARCHICALLY STRUCTURED POROUS MATERIALS: FROM NANOSCIENCE TO CATALYSIS, SEPARATION, OPTICS, ENERGY, AND LIFE SCIENCE     page: 517-529   2012

     More details

    Language:English  

    Web of Science

  116. Evolution of Mesopores in Monolithic Macroporous Ethylene-Bridged Polysilsesquioxane Gels Incorporated with Nonionic Surfactant Reviewed

    Mushiake Atsushi, Kanamori Kazuyoshi, Nakanishi Kazuki

    INTERNATIONAL JOURNAL OF POLYMER SCIENCE     2012

     More details

    Language:English  

    DOI: 10.1155/2012/460835

    Web of Science

  117. Role of block copolymer surfactant on the pore formation in methylsilsesquioxane aerogel systems Reviewed

    Kurahashi Masayuki, Kanamori Kazuyoshi, Takeda Kazuyuki, Kaji Hironori, Nakanishi Kazuki

    RSC ADVANCES   Vol. 2 ( 18 ) page: 7166-7173   2012

     More details

    Language:English  

    DOI: 10.1039/c2ra20799k

    Web of Science

  118. 612 Synthesis of Macroporous Layered Double Hydroxide with a Bulk Form for High Performance Ion Exchange Reaction

    TOKUDOME Yasuaki, TARUTANI Naoki, TAKAHASHI Masahide, NAKANISHI Kazuki

      Vol. 61   page: 159 - 160   2012

     More details

    Language:Japanese  

    CiNii Books

  119. Facile Preparation of Monolithic LiFePO4/Carbon Composites with Well-Defined Macropores for a Lithium-Ion Battery Reviewed

    Hasegawa George, Ishihara Yuya, Kanamori Kazuyoshi, Miyazaki Kohei, Yamada Yuki, Nakanishi Kazuki, Abe Takeshi

    CHEMISTRY OF MATERIALS   Vol. 23 ( 23 ) page: 5208-5216   2011.12

     More details

    Language:English  

    DOI: 10.1021/cm2021438

    Web of Science

  120. New hierarchically porous titania monoliths for chromatographic separation media Reviewed

    Hasegawa George, Morisato Kei, Kanamori Kazuyoshi, Nakanishi Kazuki

    JOURNAL OF SEPARATION SCIENCE   Vol. 34 ( 21 ) page: 3004-3010   2011.11

     More details

    Language:English  

    DOI: 10.1002/jssc.201100538

    Web of Science

  121. Preparation of Hierarchically Porous Nanocrystalline CaTiO3, SrTiO3 and BaTiO3 Perovskite Monoliths Reviewed

    Ruzimuradov Olim, Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   Vol. 94 ( 10 ) page: 3335-3339   2011.10

     More details

  122. Fabrication of highly crosslinked methacrylate-based polymer monoliths with well-defined macropores via living radical polymerization Reviewed

    Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki, Yamago Shigeru

    POLYMER   Vol. 52 ( 21 ) page: 4644-4647   2011.9

     More details

  123. Facile preparation of monolithic magnesium titanates with hierarchical porosity Reviewed

    Ruzimuradov Olim N., Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   Vol. 119 ( 1390 ) page: 440-444   2011.6

     More details

    Language:English  

    DOI: 10.2109/jcersj2.119.440

    Web of Science

  124. Performance evaluation of long monolithic silica capillary columns in gradient liquid chromatography using peptide mixtures Reviewed

    Eghbali Hamed, Sandra Koen, Detobel Frederik, Lynen Frederic, Nakanishi Kazuki, Sandra Pat, Desmet Gert

    JOURNAL OF CHROMATOGRAPHY A   Vol. 1218 ( 21 ) page: 3360-3366   2011.5

     More details

  125. Transition from transparent aerogels to hierarchically porous monoliths in polymethylsilsesquioxane sol-gel system Reviewed

    Kanamori Kazuyoshi, Kodera Yasunori, Hayase Gen, Nakanishi Kazuki, Hanada Teiichi

    JOURNAL OF COLLOID AND INTERFACE SCIENCE   Vol. 357 ( 2 ) page: 336-344   2011.5

     More details

  126. Monolithic silica rod columns for high-efficiency reversed-phase liquid chromatography Reviewed

    Miyazaki Shota, Takahashi Masakazu, Ohira Masayoshi, Terashima Hiroyuki, Morisato Kei, Nakanishi Kazuki, Ikegami Tohru, Miyabe Kanji, Tanaka Nobuo

    JOURNAL OF CHROMATOGRAPHY A   Vol. 1218 ( 15 ) page: 1988-1994   2011.4

     More details

  127. Synthesis of hierarchical macro/mesoporous dicalcium phosphate monolith via epoxide-mediated sol-gel reaction from ionic precursors Reviewed

    Tokudome Yasuaki, Miyasaka Akira, Nakanishi Kazuki, Hanada Teiichi

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 57 ( 3 ) page: 269-278   2011.3

     More details

  128. New flexible aerogels and xerogels derived from methyltrimethoxysilane/dimethyldimethoxysilane co-precursors Reviewed

    Hayase Gen, Kanamori Kazuyoshi, Nakanishi Kazuki

    JOURNAL OF MATERIALS CHEMISTRY   Vol. 21 ( 43 ) page: 17077-17079   2011

     More details

    Language:English  

    DOI: 10.1039/c1jm13664j

    Web of Science

  129. Controlled pore formation in organotrialkoxysilane-derived hybrids: from aerogels to hierarchically porous monoliths Reviewed

    Kanamori Kazuyoshi, Nakanishi Kazuki

    CHEMICAL SOCIETY REVIEWS   Vol. 40 ( 2 ) page: 754-770   2011

     More details

    Language:English  

    DOI: 10.1039/c0cs00068j

    Web of Science

  130. Monolithic electrode for electric double-layer capacitors based on macro/meso/microporous S-Containing activated carbon with high surface area Reviewed

    Hasegawa George, Aoki Mami, Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi, Tadanaga Kiyoharu

    JOURNAL OF MATERIALS CHEMISTRY   Vol. 21 ( 7 ) page: 2060-2063   2011

     More details

    Language:English  

    DOI: 10.1039/c0jm03793a

    Web of Science

  131. In situ SAXS observation on metal-salt-derived alumina sol-gel system accompanied by phase separation Reviewed

    Tokudome Yasuaki, Nakanishi Kazuki, Kanamori Kazuyoshi, Hanada Teiichi

    JOURNAL OF COLLOID AND INTERFACE SCIENCE   Vol. 352 ( 2 ) page: 303-308   2010.12

     More details

  132. Facile Preparation of Hierarchically Porous TiO2 Monoliths Reviewed

    Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   Vol. 93 ( 10 ) page: 3110-3115   2010.10

     More details

  133. Synthesis of high-silica and low-silica zeolite monoliths with trimodal pores Reviewed

    Tokudome Yasuaki, Nakanishi Kazuki, Kosaka Sho, Kariya Ayuta, Kaji Hironori, Hanada Teiichi

    MICROPOROUS AND MESOPOROUS MATERIALS   Vol. 132 ( 3 ) page: 538-542   2010.8

     More details

  134. Sol-gel preparation of Ni/TiO2 catalysts with bimodal pore structures Reviewed

    Numata Masayuki, Takahashi Ryoji, Yamada Ikuya, Nakanishi Kazuki, Sato Satoshi

    APPLIED CATALYSIS A-GENERAL   Vol. 383 ( 1-2 ) page: 66-72   2010.7

     More details

  135. Fabrication of activated carbons with well-defined macropores derived from sulfonated poly(divinylbenzene) networks Reviewed

    Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi

    CARBON   Vol. 48 ( 6 ) page: 1757-1766   2010.5

     More details

  136. Facile preparation of transparent monolithic titania gels utilizing a chelating ligand and mineral salts Reviewed

    Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 53 ( 1 ) page: 59-66   2010.1

     More details

  137. Hierarchically porous carbon monoliths with high surface area from bridged polysilsesquioxanes without thermal activation process Reviewed

    Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi

    CHEMICAL COMMUNICATIONS   Vol. 46 ( 42 ) page: 8037-8039   2010

     More details

    Language:English  

    DOI: 10.1039/c0cc02974b

    Web of Science

  138. Macro- and microporous carbon monoliths with high surface areas pyrolyzed from poly(divinylbenzene) networks Reviewed

    Hasegawa Joji, Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi

    COMPTES RENDUS CHIMIE   Vol. 13 ( 1-2 ) page: 207-211   2010

     More details

  139. Sol-gel synthesis, porous structure, and mechanical property of polymethylsilsesquioxane aerogels Reviewed

    Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   Vol. 117 ( 1372 ) page: 1333-1338   2009.12

     More details

    Language:English  

    DOI: 10.2109/jcersj2.117.1333

    Web of Science

  140. Semi-micro-monolithic columns using macroporous silica rods with improved performance

    Morisato Kei, Miyazaki Shota, Ohira Masayoshi, Furuno Masahiro, Nyudo Masahiko, Terashima Hiroyuki, Nakanishi Kazuki

    JOURNAL OF CHROMATOGRAPHY A   Vol. 1216 ( 44 ) page: 7384-7387   2009.10

     More details

  141. Sol-gel synthesis of macro-mesoporous titania monoliths and their applications to chromatographic separation media for organophosphate compounds Reviewed

    Konishi Junko, Fujita Koji, Nakanishi Kazuki, Hirao Kazuyuki, Morisato Kei, Miyazaki Shota, Ohira Masayoshi

    JOURNAL OF CHROMATOGRAPHY A   Vol. 1216 ( 44 ) page: 7375-7383   2009.10

     More details

  142. Structural characterization of hierarchically porous alumina aerogel and xerogel monoliths Reviewed

    Tokudome Yasuaki, Nakanishi Kazuki, Kanamori Kazuyoshi, Fujita Koji, Akamatsu Hirofumi, Hanada Teiichi

    JOURNAL OF COLLOID AND INTERFACE SCIENCE   Vol. 338 ( 2 ) page: 506-513   2009.10

     More details

  143. Performance of wide-pore monolithic silica column in protein separation Reviewed

    Morisaka Hironobu, Kobayashi Kengo, Kirino Aya, Furuno Masahiro, Minakuchi Hiroyoshi, Nakanishi Kazuki, Ueda Mitsuyoshi

    JOURNAL OF SEPARATION SCIENCE   Vol. 32 ( 15-16 ) page: 2747-2751   2009.8

     More details

    Language:English  

    DOI: 10.1002/jssc.200800653

    Web of Science

  144. Rigid Crosslinked Polyacrylamide Monoliths with Well-Defined Macropores Synthesized by Living Polymerization Reviewed

    Hasegawa Joji, Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi, Yamago Shigeru

    MACROMOLECULAR RAPID COMMUNICATIONS   Vol. 30 ( 12 ) page: 986-990   2009.6

     More details

    Language:English  

    DOI: 10.1002/marc.200900066

    Web of Science

  145. Effect of La addition on thermal microstructural evolution of macroporous alumina monolith prepared from ionic precursors Reviewed

    Tokudome Yasuaki, Nakanishi Kazuki, Hanada Teiichi

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   Vol. 117 ( 1363 ) page: 351-355   2009.3

     More details

    Language:English  

    DOI: 10.2109/jcersj2.117.351

    Web of Science

  146. Pore Formation in Poly(divinylbenzene) Networks Derived from Organotellurium-Mediated Living Radical Polymerization Reviewed

    Hasegawa Joji, Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi, Yamago Shigeru

    MACROMOLECULES   Vol. 42 ( 4 ) page: 1270-1277   2009.2

     More details

    Language:English  

    DOI: 10.1021/ma802343a

    Web of Science

  147. Elastic Aerogels and Xerogels Synthesized From Methyltrimethoxysilane (MTMS) Reviewed

    Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi

    POLYMER-BASED SMART MATERIALS - PROCESSES, PROPERTIES AND APPLICATION   Vol. 1134   page: 173-+   2009

     More details

    Language:English  

    Web of Science

  148. Spinodal decomposition in siloxane sol-gel systems in macroporous media Reviewed

    Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi

    SOFT MATTER   Vol. 5 ( 16 ) page: 3106-3113   2009

     More details

    Language:English  

    DOI: 10.1039/b903444g

    Web of Science

  149. Fabrication of macroporous silicon carbide ceramics by intramolecular carbothermal reduction of phenyl-bridged polysilsesquioxane Reviewed

    Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi

    JOURNAL OF MATERIALS CHEMISTRY   Vol. 19 ( 41 ) page: 7716-7720   2009

     More details

    Language:English  

    DOI: 10.1039/b913992c

    Web of Science

  150. Preparation of Macroporous Poly(divinylbenzene) Gels Via Living Radical Polymerization Reviewed

    Hasegawa Joji, Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi, Yamago Shigeru

    POLYMER-BASED SMART MATERIALS - PROCESSES, PROPERTIES AND APPLICATION   Vol. 1134   page: 139-+   2009

     More details

    Language:English  

    Web of Science

  151. Elastic organic-inorganic hybrid aerogels and xerogels

    Kanamori Kazuyoshi, Aizawa Mamoru, Nakanishi Kazuki, Hanada Teiichi

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 48 ( 1-2 ) page: 172-181   2008.11

     More details

  152. Facile Synthesis of Macroporous Cross-Linked Methacrylate Gels by Atom Transfer Radical Polymerization

    Kanamori Kazuyoshi, Hasegawa Joji, Nakanishi Kazuki, Hanada Tefichi

    MACROMOLECULES   Vol. 41 ( 19 ) page: 7186-7193   2008.10

     More details

    Language:English  

    DOI: 10.1021/ma800563p

    Web of Science

  153. Scattering-based hole burning through volume speckles in a random medium with tunable diffusion constant Reviewed

    Murai Shunsuke, Fujita Koji, Hirao Takayuki, Nakanishi Kazuki, Hirao Kazuyuki, Tanaka Katsuhisa

    APPLIED PHYSICS LETTERS   Vol. 93 ( 15 )   2008.10

     More details

    Language:English  

    DOI: 10.1063/1.2955830

    Web of Science

  154. 22aYE-7 Effect of the gel structure on the acoustic property of liquid ^4He in silica gel

    Ohmori K., Tanaka T., Abe S., Tsujii H., Suzuki H., Matsumoto K., Nakanishi K., Kanamori K.

    Meeting abstracts of the Physical Society of Japan   Vol. 63 ( 2 ) page: 709 - 709   2008.8

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

  155. Preparation and properties of radiofrequency sputtered X-ray amorphous films in the system SiO2-ZrO2

    Sawa Akira, Nakanishi Kazuki, Hanada Teiichi

    THIN SOLID FILMS   Vol. 516 ( 15 ) page: 4665-4672   2008.6

     More details

  156. Preparation of monolithic silica columns for high-performance liquid chromatography

    Nunez Oscar, Nakanishi Kazuki, Tanaka Nobuo

    JOURNAL OF CHROMATOGRAPHY A   Vol. 1191 ( 1-2 ) page: 231-252   2008.5

     More details

  157. Alkoxy-derived multiscale porous TiO2 gels probed by ultra-small-angle X-ray scattering and small-angle X-ray scattering

    Konishi Junko, Fujita Koji, Nakanishi Kazuki, Nishitsuji Shotaro, Takenaka Mikihito, Miura Kiyotaka, Hirao Kazuyuki

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 46 ( 1 ) page: 63-69   2008.4

     More details

  158. Crystalline ZrO2 monoliths with well-defined macropores and mesostructured skeletons prepared by combining the alkoxy-derived sol-gel process accompanied by phase separation and the solvothermal process

    Konishi Junko, Fujita Koji, Oiwa Satoshi, Nakanishi Kazuki, Hirao Kazuyuki

    CHEMISTRY OF MATERIALS   Vol. 20 ( 6 ) page: 2165-2173   2008.3

     More details

    Language:English  

    DOI: 10.1021/cm703351d

    Web of Science

  159. Multiscale templating of siloxane gels via polymerization-induced phase separation

    Nakanishi Kazuki, Amatani Tomohiko, Yano Seiji, Kodaira Tetsuya

    CHEMISTRY OF MATERIALS   Vol. 20 ( 3 ) page: 1108-1115   2008.2

     More details

    Language:English  

    DOI: 10.1021/cm702486b

    Web of Science

  160. Cr3+-doped macroporous Al2O3 monoliths prepared by the metal-salt-derived sol-gel method

    Fujita Koji, Tokudome Yasuaki, Nakanishi Kazuki, Miura Kiyotaka, Hirao Kazuyuki

    JOURNAL OF NON-CRYSTALLINE SOLIDS   Vol. 354 ( 2-9 ) page: 659-664   2008.1

     More details

  161. Hierarchically porous oxides, hybrids and polymers via sol-gel accompanied by phase separation

    Nakanishi Kazuki

    ORGANIC/INORGANIC HYBRID MATERIALS - 2007   Vol. 1007   page: 51-62   2008

     More details

    Language:English  

    Web of Science

  162. Phase separation in alkoxy-derived silica system containing polyacrylamide

    Kawamoto Kousuke, Nakanishi Kazuki, Hanada Teiichi

    ORGANIC/INORGANIC HYBRID MATERIALS - 2007   Vol. 1007   page: 63-68   2008

     More details

    Language:English  

    Web of Science

  163. Phase separation in Al2O3 sol-gel system incorporated with high molecular weight poly(ethylene oxide)

    Tokudome Yasuaki, Nakanishi Kazuki, Fujita Koji, Miura Kiyotaka, Hirao Kazuyuki

    ORGANIC/INORGANIC HYBRID MATERIALS - 2007   Vol. 1007   page: 69-74   2008

     More details

    Language:English  

    Web of Science

  164. Sol-gel synthesis of macroporous YAG from ionic precursors via phase separation route

    Tokudome Yasuaki, Fujita Koji, Nakanishi Kazuki, Kanamori Kazuyoshi, Miura Kiyotaka, Hirao Kazuyuki, Hanada Teiichi

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   Vol. 115 ( 1348 ) page: 925-928   2007.12

     More details

    Language:English  

    Web of Science

  165. Sur-face interaction of well-defined, concentrated poly,(2-hydroxyethyl methacrylate) brushes with proteins

    Yoshikawa Chiaki, Goto Atsushi, Tsujii Yoshinobu, Ishizuka Norio, Nakanishi Kazuki, Fukuda Takeshi

    JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY   Vol. 45 ( 21 ) page: 4795-4803   2007.11

     More details

    Language:English  

    DOI: 10.1002/pola.22224

    Web of Science

  166. Sol-gel with phase separation. Hierarchically porous materials optimized for high-performance liquid chromatography separations

    Nakanishi Kazuki, Tanaka Nobuo

    ACCOUNTS OF CHEMICAL RESEARCH   Vol. 40 ( 9 ) page: 863-873   2007.9

     More details

    Language:English  

    DOI: 10.1021/ar600034p

    Web of Science

  167. Synthesis of monolithic Al2O3 with well-defined macropores and mesostructured skeletons via the sol-gel process accompanied by phase separation

    Tokudome Yasuaki, Fujita Koji, Nakanishi Kazuki, Miura Kiyotaka, Hirao Kazuyuki

    CHEMISTRY OF MATERIALS   Vol. 19 ( 14 ) page: 3393-3398   2007.7

     More details

    Language:English  

    DOI: 10.1021/cm063051p

    Web of Science

  168. New transparent methylsilsesquioxane aerogels and xerogels with improved mechanical properties

    Kanamori Kazuyoshi, Aizawa Mamoru, Nakanishi Kazuki, Hanada Teiichi

    ADVANCED MATERIALS   Vol. 19 ( 12 ) page: 1589-+   2007.6

     More details

    Language:English  

    DOI: 10.1002/adma.200602457

    Web of Science

  169. Three-dimensional observation of macroporous silica gels and the study on structural formation mechanism

    Saito Haruko, Kanamori Kazuyoshi, Nakanishi Kazuki, Hirao Kazuyuki, Nishikawa Yukihiro, Jinnai Hiroshi

    COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   Vol. 300 ( 1-2 ) page: 245-252   2007.6

     More details

  170. Temperature-tunable scattering strength based on the phase transition of liquid crystal infiltrated in well-defined macroporous random media

    Murai Shunsuke, Fujita Koji, Hirao Takayuki, Nakanishi Kazuki, Hirao Kazuyuki

    OPTICAL MATERIALS   Vol. 29 ( 8 ) page: 949-954   2007.4

     More details

  171. Simple liquid chromatography using monolithic silica rod and capillary

    Oi Naobumi, Morisato Kei, Minakuchi Hiroyoshi, Nakanishi Kazuki

    BUNSEKI KAGAKU   Vol. 56 ( 4 ) page: 227-229   2007.4

     More details

    Language:English  

    Web of Science

  172. Functional porous materials via sol-gel with phase separation

    Nakanishi Kazuki

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   Vol. 115 ( 1339 ) page: 169-175   2007.3

     More details

    Language:English  

    Web of Science

  173. High-throughput protein digestion by trypsin-immobilized monolithic silica with pipette-tip formula

    Ota Shigenori, Miyazaki Shota, Matsuoka Hideo, Morisato Kei, Shintani Yukihiro, Nakanishi Kazuki

    JOURNAL OF BIOCHEMICAL AND BIOPHYSICAL METHODS   Vol. 70 ( 1 ) page: 57-62   2007.2

     More details

  174. Size-exclusion effect and protein repellency of concentrated polymer brushes prepared by surface-initiated living radical polymerization

    Yoshikawa Chiaki, Goto Atsushi, Ishizuka Norio, Nakanishi Kazuki, Kishida Akio, Tsujii Yoshinobit, Fukuda Takeshi

    MACROMOLECULAR SYMPOSIA   Vol. 248   page: 189-198   2007

     More details

    Language:English  

    DOI: 10.1002/masy.200750220

    Web of Science

  175. Monolithic TiO2 with controlled multiscale porosity via a template-free sol-gel process accompanied by phase separation

    Konishi Junko, Fujita Koji, Nakanishi Kazuki, Hirao Kazuyuki

    CHEMISTRY OF MATERIALS   Vol. 18 ( 25 ) page: 6069-6074   2006.12

     More details

    Language:English  

    DOI: 10.1021/cm0617485

    Web of Science

  176. Performance of monolithic silica capillary columns with increased phase ratios and small-sized domains

    Hara Takeshi, Kobayashi Hiroshi, Ikegami Tohru, Nakanishi Kazuki, Tanaka Nobuo

    ANALYTICAL CHEMISTRY   Vol. 78 ( 22 ) page: 7632-7642   2006.11

     More details

    Language:English  

    DOI: 10.1021/ac060770e

    Web of Science

  177. Thick silica gel coatings on methylsilsesquioxane monoliths using anisotropic phase separation

    Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi

    JOURNAL OF SEPARATION SCIENCE   Vol. 29 ( 16 ) page: 2463-2470   2006.11

     More details

    Language:English  

    DOI: 10.1002/jssc.200600163

    Web of Science

  178. Rigid macroporous poly(divinylbenzene) monoliths with a well-defined bicontinuous morphology prepared by living radical polymerization

    Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi

    ADVANCED MATERIALS   Vol. 18 ( 18 ) page: 2407-+   2006.9

     More details

    Language:English  

    DOI: 10.1002/adma.200601026

    Web of Science

  179. Morphological control and strong light scattering in macroporous TiO2 monoliths prepared via a colloid-derived sol-gel route

    Fujita Koji, Konishi Junko, Nakanishi Kazuki, Hirao Kazuyuki

    SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS   Vol. 7 ( 6 ) page: 511-518   2006.9

     More details

  180. High-performance liquid chromatographic enantioseparations on capillary columns containing crosslinked polysaccharide phenylcarbamate derivatives attached to monolithic silica

    Chankvetadze Bezhan, Kubota Takateru, Ikai Tomoyuki, Yamamoto Chiyo, Kamigaito Masami, Tanaka Nobuo, Nakanishi Kazuki, Okamoto Yoshio

    JOURNAL OF SEPARATION SCIENCE   Vol. 29 ( 13 ) page: 1988-1995   2006.8

     More details

    Language:English  

    DOI: 10.1002/jssc.200500388

    Web of Science

  181. Fabrication of Sm2+-doped macroporous aluminosilicate glasses with high alumina content

    Hirao Takayuki, Fujita Koji, Murai Shunsuke, Nakanishi Kazuki, Hirao Kazuyuki

    JOURNAL OF NON-CRYSTALLINE SOLIDS   Vol. 352 ( 23-25 ) page: 2553-2557   2006.7

     More details

  182. Formation of photonic structures in Sm2+-doped aluminosilicate glasses through phase separation

    Fujita Koji, Murai Shunsuke, Nakanishi Kazuki, Hirao Kazuyuki

    JOURNAL OF NON-CRYSTALLINE SOLIDS   Vol. 352 ( 23-25 ) page: 2496-2500   2006.7

     More details

  183. Mutual consistency between simulated and measured pressure drops in silica monoliths based on geometrical parameters obtained by three-dimensional laser scanning confocal microscope observations

    Saito Haruko, Nakanishi Kazuki, Hirao Kazuyuki, Jinnai Hiroshi

    JOURNAL OF CHROMATOGRAPHY A   Vol. 1119 ( 1-2 ) page: 95-104   2006.6

     More details

  184. Anisotropic siloxane-based monolith prepared in confined spaces

    Suzumura Yoshitaka, Kanamori Kazuyoshi, Nakanishi Kazuki, Hirao Kazuyuki, Yamamichi Junta

    JOURNAL OF CHROMATOGRAPHY A   Vol. 1119 ( 1-2 ) page: 88-94   2006.6

     More details

  185. Thermodynamics of aggregation of two proteins Reviewed

    Nakanishi Kazuki, Kikuchi Macoto

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   Vol. 75 ( 6 )   2006.6

     More details

    Language:English  

    DOI: 10.1143/JPSJ.75.064803

    Web of Science

  186. Sol-gel process of oxides accompanied by phase separation

    Nakanishi Kazuki

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   Vol. 79 ( 5 ) page: 673-691   2006.5

     More details

    Language:English  

    DOI: 10.1246/bcsj.79.673

    Web of Science

  187. Porous methylsiloxane gel thick film for millimeter-wave antenna substrate prepared by gap filling method

    Tanaka Takeharu, Kawakami Nobuyuki, Hirano Takayuki, Fukumoto Yoshito, Suzuki Tetsuo, Kanamori Kazuyoshi, Nakanishi Kazuki

    MATERIAL AND DEVICES FOR SMART SYSTEMS II   Vol. 888   page: 251-+   2006

     More details

    Language:English  

    Web of Science

  188. Size exclusion chromatography of standard polystyrenes with a wide range of molecular weight up to 7.45 x 10(6) on monolithic silica capillary columns

    Ute Koichi, Yoshida Saori, Kitayama Tatsuki, Bamba Takeshi, Harada Kazuo, Fukusaki Eiichiro, Kobayashi Akio, Ishizuka Norio, Minakuchi Hiroyoshi, Nakanishi Kazuki

    POLYMER JOURNAL   Vol. 38 ( 11 ) page: 1194-1197   2006

     More details

    Language:English  

    DOI: 10.1295/polymj.PJ2006079

    Web of Science

  189. High-performance frontal analysis of the binding of thyroxine enantiomers to human serum albumin

    Kimura T, Nakanishi K, Nakagawa T, Shibukawa A, Matsuzaki K

    PHARMACEUTICAL RESEARCH   Vol. 22 ( 4 ) page: 667-675   2005.4

     More details

  190. Insight on structural change in sol-gel-derived silica gel with aging under basic conditions for mesopore control

    Takahashi R, Nakanishi K, Soga N

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 33 ( 2 ) page: 159-167   2005.2

     More details

    Language:English  

    Web of Science

  191. Topical application of ionic polymers affects skin permeability barrier homeostasis

    Denda M, Nakanishi K, Kumazawa N

    SKIN PHARMACOLOGY AND PHYSIOLOGY   Vol. 18 ( 1 ) page: 36-41   2005

     More details

    Language:English  

    DOI: 10.1159/000081684

    Web of Science

  192. High-performance liquid chromatographic enantioseparations on capillary columns containing monolithic

    Chankvetadze B, Yamamoto C, Tanaka N, Nakanishi K, Okamoto Y

    JOURNAL OF SEPARATION SCIENCE   Vol. 27 ( 10-11 ) page: 905-911   2004.7

     More details

    Language:English  

    DOI: 10.1002/jssc.200401819

    Web of Science

  193. Controlled hierarchical pore structures in ethylene-bridged polysilsesquioxane gels

    Y Kobayashi, K Nakanishi, K Hirao

    CONTINUOUS NANOPHASE AND NANOSTRUCTURED MATERIALS   Vol. 788   page: 353 - 358   2004

     More details

    Language:English   Publisher:MATERIALS RESEARCH SOCIETY  

    Formation of hierarchical macropores and mesopores in ethylene-bridged polysilsesquioxane sol-gel systems via concurrent sol-gel transition and phase separation induced by the incorporation of supramolecular templats has been investigated. A series of poly(ethyleneglycol)-poly(propyleneglycol)- poly(ethyleneglycol) triblock copolymers, EOPOEOs, have been employed as supramolecular templates, while 1,2-bis(trimethoxysilyl)ethane was used as a polysilsesquioxane source. Successful combination of templated mesopores and well-defined macropores due to phase-separation has been found in the system with EOPOEOs having 70 PO units and respective 20 EO units. Although similar macroporous morphology has been obtained for all the EOPOEOs with EO chain longer or shorter than 20 units, the optimum composition for the co-continuous macropores and that for templated mesopores deviated from each other, resulting in the failure of producing hierarchical macropores and mesopores.

    Web of Science

    Scopus

  194. 632 ランダムフォトニックナノ構造における希土類イオンの空間選択的価数制御(ナノマテリアルの特性,ナノマテリアル最前線,オーガナイスドセッション11,第53期学術講演会)

    藤田 晃司, 大橋 良太, 村井 俊介, 中西 和樹, 平尾 一之

    学術講演会講演論文集   Vol. 53   page: 452 - 453   2004

     More details

    Language:Japanese   Publisher:日本材料学会  

    CiNii Books

  195. Monolithic silica columns with chemically bonded beta-cyclodextrin as a stationary phase for enantiomer separations of chiral pharmaceuticals

    Lubda D, Cabrera K, Nakanishi K, Lindner W

    ANALYTICAL AND BIOANALYTICAL CHEMISTRY   Vol. 377 ( 5 ) page: 892-901   2003.11

     More details

  196. A14 完全二次元HPLCの研究

    木村宏, 池上亨, 細矢憲, 田中信男, 石塚紀生, 水口博義, 中西和樹, 新谷幸弘

    Chromatography   Vol. 24 ( Supplement 2 )   2003

     More details

  197. Monolithic LC columns

    Tanaka N, Kobayashi H, Nakanishi K, Minakuchi H, Ishizuka N

    ANALYTICAL CHEMISTRY   Vol. 73 ( 15 ) page: 420A-429A   2001.8

     More details

    Language:English  

    Web of Science

  198. About the total performance of monolithic HPLC-columns.

    Cabrera K, Minakuchi H, Lubda D, Nakanishi K

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   Vol. 221   page: U100-U100   2001.4

     More details

    Language:English  

    Web of Science

  199. Porous gels made by phase separation: Recent progress and future directions

    Nakanishi K

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 19 ( 1-3 ) page: 65-70   2000.12

     More details

    Language:English  

    Web of Science

  200. Preparation and chromatographic application of macroporous silicate in a capillary

    Ishizuka N, Nakanishi K, Hirao K, Tanaka N

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 19 ( 1-3 ) page: 371-375   2000.12

     More details

    Language:English  

    Web of Science

  201. Membrane emulsification using sol-gel derived macroporous silica glass

    Fuchigami T, Toki M, Nakanishi K

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 19 ( 1-3 ) page: 337-341   2000.12

     More details

    Language:English  

    Web of Science

  202. Formation of hierarchical pore structure in silica gel

    Nakanishi K, Takahashi R, Nagakane T, Kitayama K, Koheiya N, Shikata H, Soga N

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 17 ( 3 ) page: 191-210   2000.3

     More details

    Language:English  

    Web of Science

  203. Aggregation behavior of alkoxide-derived silica in sol-gel process in presence of poly(ethylene oxide)

    Takahashi R, Nakanishi K, Soga N

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 17 ( 1 ) page: 7-18   2000.1

     More details

    Language:English  

    Web of Science

  204. Tailoring mesopores in monolithic macroporous silica for HPLC

    Nakanishi K, Shikata H, Ishizuka N, Koheiya N, Soga N

    HRC-JOURNAL OF HIGH RESOLUTION CHROMATOGRAPHY   Vol. 23 ( 1 ) page: 106-110   2000.1

     More details

    Language:English  

    Web of Science

  205. Performance of an octadecylsilylated continuous porous silica column in polypeptide separations

    Minakuchi H, Ishizuka N, Nakanishi K, Soga N, Tanaka N

    JOURNAL OF CHROMATOGRAPHY A   Vol. 828 ( 1-2 ) page: 83-90   1998.12

     More details

    Language:English  

    Web of Science

  206. Chromatographic properties of miniaturized silica rod columns

    Ishizuka N, Minakuchi H, Nakanishi K, Soga N, Hosoya K, Tanaka N

    HRC-JOURNAL OF HIGH RESOLUTION CHROMATOGRAPHY   Vol. 21 ( 8 ) page: 477-479   1998.8

     More details

    Language:English  

    Web of Science

  207. Morphology control of macroporous silica-zirconia gel based on phase separation

    Takahashi R, Nakanishi K, Soga N

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   Vol. 106 ( 8 ) page: 772-777   1998.8

     More details

    Language:English  

    DOI: 10.2109/jcersj.106.772

    Web of Science

  208. Designing monolithic double-pore silica for high-speed liquid chromatography

    Ishizuka N, Minakuchi H, Nakanishi K, Soga N, Tanaka N

    JOURNAL OF CHROMATOGRAPHY A   Vol. 797 ( 1-2 ) page: 133-137   1998.2

     More details

    Language:English  

    Web of Science

  209. Effect of domain size on the performance of octadecylsilylated continuous porous silica columns in reversed-phase liquid chromatography

    Minakuchi H, Nakanishi K, Soga N, Ishizuka N, Tanaka N

    JOURNAL OF CHROMATOGRAPHY A   Vol. 797 ( 1-2 ) page: 121-131   1998.2

     More details

    Language:English  

    Web of Science

  210. Pore Structure Control of Silica Gels Based on Phase Separation

    Nakanishi Kazuki

    JOURNAL OF POROUS MATERIALS   Vol. 4 ( 2 ) page: 67-112   1997.6

     More details

    Language:English  

    Web of Science

  211. Double pore silica gel monolith applied to liquid chromatography

    Nakanishi K, Minakuchi H, Soga N, Tanaka N

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 8 ( 1-3 ) page: 547-552   1997

     More details

    Language:English  

    Web of Science

  212. Octadecylsilylated porous silica rods as separation media for reversed-phase liquid chromatography

    Minakuchi H, Nakanishi K, Soga N, Ishizuka N, Tanaka N

    ANALYTICAL CHEMISTRY   Vol. 68 ( 19 ) page: 3498-3501   1996.10

     More details

    Language:English  

    Web of Science

  213. EFFECTS OF AGING AND SOLVENT EXCHANGE ON PORE STRUCTURE OF SILICA-GELS WITH INTERCONNECTED MACROPORES

    TAKAHASHI R, NAKANISHI K, SOGA N

    JOURNAL OF NON-CRYSTALLINE SOLIDS   Vol. 189 ( 1-2 ) page: 66-76   1995.8

     More details

    Language:English  

    Web of Science

  214. Small-angle X-Ray scattering study of nanopore evolution of macroporous silica gel by solvent exchange

    Takahashi R, Nakanishi K, Soga N

    FARADAY DISCUSSIONS   Vol. 101   page: 249-263   1995

     More details

    Language:English  

    Web of Science

  215. Phase Separation Kinetics in Silica Sol-Gel System Containing Polyethylene Oxide. I. Initial Stage

    Nakanishi Kazuki, Yamasaki Yuki, Kaji Hironori, Soga Naohiro, Inoue Tadashi, Nemoto Norio

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 2 ( 1-3 ) page: 227-231   1994.1

     More details

    Language:English  

    Web of Science

  216. In Situ Observation of Phase Separation Processes in Gelling Alkoxy-Derived Silica System by Light Scattering Method Reviewed

    Kaji Hironori, Nakanishi Kazuki, Soga Naohiro, Inoue Tadashi, Nemoto Norio

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 3 ( 3 ) page: 169-188   1994.1

     More details

    Language:English  

    Web of Science

  217. Polymerization-Induced Phase Separation in Silica Sol-Gel Systems Containing Formamide Reviewed

    Kaji Hironori, Nakanishi Kazuki, Soga Naohiro

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 1 ( 1 ) page: 35-46   1993.1

     More details

    Language:English  

    Web of Science

  218. MACROPORE STRUCTURE DESIGN OF SOL-GEL DERIVED SILICA BY SPINODAL DECOMPOSITION

    NAKANISHI K, KAJI H, SOGA N

    POROUS MATERIALS   Vol. 31   page: 51-60   1993

     More details

    Language:English  

    Web of Science

  219. DUAL-POROSITY SILICA-GELS BY POLYMER-INCORPORATED SOL-GEL PROCESS

    NAKANISHI K, TAKAHASHI R, SOGA N

    JOURNAL OF NON-CRYSTALLINE SOLIDS   Vol. 147   page: 291-295   1992.10

     More details

    Language:English  

    Web of Science

  220. PHASE-SEPARATION IN SILICA SOL-GEL SYSTEM CONTAINING POLYACRYLIC-ACID .3. EFFECT OF CATALYTIC CONDITION

    NAKANISHI K, SOGA N

    JOURNAL OF NON-CRYSTALLINE SOLIDS   Vol. 142 ( 1-2 ) page: 36-44   1992.4

     More details

    Language:English  

    Web of Science

  221. CRYSTALLIZATION OF SILICA-GELS CONTAINING SODIUM POLY-4-STYRENE SULFONATE

    NAKANISHI K, SOGA N

    JOURNAL OF NON-CRYSTALLINE SOLIDS   Vol. 108 ( 2 ) page: 157-162   1989.3

     More details

    Language:English  

    Web of Science

▼display all

Presentations 2

  1. 高速LC‐MS/MS分析におけるモノリス型ショートカラムの有用性 International conference

    宮崎将太, 宮下賢, 青山千顕, 森里恵, 森里恵, 中西和樹, 佐藤睦

    質量分析総合討論会講演要旨集  2017.5.1 

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

  2. Elastic aerogels and xerogels synthesized from methyltrimethoxysilane (MTMS) International conference

    K. Kanamori, K. Nakanishi, T. Hanada

    Materials Research Society Symposium Proceedings  2008.9.1 

     More details

    Language:English   Presentation type:Oral presentation (general)  

    Transparent organic-inorganic hybrid aerogels and aerogel-like xerogels have been prepared from methyltrimethoxysilane (MTMS) respectively by supercritical drying (SCD) and ambient pressure drying (APD). The new aerogels and xerogels significantly deform without collapsing on uniaxial compression and almost fully relax when unloaded. This elastic behavior, termed as "spring-back", allows APD without noticeable shrinkage and cracking. The flexible network composed of lower cross-linking density (up to three bonds per every silicon atom) compared to silica gels (up to four bonds) and repulsion between hydrophobic methyl groups bonded to every silicon atom largely contributes to the pronounced deformability and relaxing, respectively. Lower surface silanol group density also plays a crucial role for the "spring-back" behavior. © 2009 Materials Research Society.

KAKENHI (Grants-in-Aid for Scientific Research) 28

  1. 低密度高気孔率物質のクロススケール構造制御による強靭化と機能開拓

    Grant number:22H00342  2022.4 - 2025.3

    科学研究費助成事業  基盤研究(A)

    中西 和樹

      More details

    Authorship:Principal investigator 

    Grant amount:\42900000 ( Direct Cost: \33000000 、 Indirect Cost:\9900000 )

  2. Macroporous monoliths surface-modified with MOF using precise ligand exchange

    Grant number:18H02056  2018.4 - 2021.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Nakanishi Kazuki

      More details

    Authorship:Principal investigator 

    Grant amount:\17290000 ( Direct Cost: \13300000 、 Indirect Cost:\3990000 )

    Hierarchically porous MOF-functionalized materials have been synthesized through two different stragegies; i) Precipitating MOFs onto the inner surfaces of macroporous metal (oxy)hydroxide by direct exchanges of coordinating ligands. ii) Sol-gel reaction accompanied by phase separation in the course of network formation between metal ions and coordinating ligands. The latter solid retained a short-range atomic order similar to those in crystallized MOFs and the crystallization was performed by post-gelation treatments. Using pulverized and classified hierarchically porous MOF particles, various physico-chemical reactions such as gas adsorption/storage and separation/purification processes was found to be accelerated compared with those using non-porous counterparts.

  3. In-situ generated metal/alloy nanoparticles within monolithic hydridosilica support applied to catalytic reactions

    Grant number:26288106  2014.4 - 2017.3

    Nakanishi Kazuki

      More details

    Authorship:Principal investigator 

    Grant amount:\17290000 ( Direct Cost: \13300000 、 Indirect Cost:\3990000 )

    Hydrolysis/polycondensation of trialkoxysilanes was carefully conducted to preserve Si-H ligands followed by the sol-gel transition accompanied by phase separation, which lead to the formation of hierarchically macro/meso-porous hydridosilica monoliths. By introducing noble metals solutions with optimized solvent composition into the hydridosilica monoliths, metal/alloy nanoparticles were formed in a controlled manner. The catalytic performance was evaluated using the monolithic flow-through reactors with embedded metal/alloy nanoparticles as catalysts. Dehydrogenation catalyzed by borane catalyst was also explored to modify silica supports with well-defined pore structure with polymeric reagents bearing Si-H groups. The metal/alloy nanoparticles were produced on the surface of silica support of which catalytic performance was examined in detail.

  4. Preparation of porous lithium iron phosphate - carbon monolith via liquid-phase route

    Grant number:25620185  2013.4 - 2015.3

    NAKANISHI Kazuki

      More details

    Authorship:Principal investigator 

    Grant amount:\4030000 ( Direct Cost: \3100000 、 Indirect Cost:\930000 )

    Macroporous monolithic lithium iron phosphate has been synthesized from iron chloride hexahydrate, orthophosphoric acid and lithium chloride, via a sol-gel process accompanied by phase separation. For materials synthesized by substituting a part of starting compositions, the variation in the electrode capacity was relatively small. As an alternative materials, macroporous monolithic titanium oxides were adopted. Using non-aqueous sol-gel method, macroporous titanium oxide monoliths containing a high concentration of nitrogen were synthesized, followed by appropriate heat-treatment to obtain nitrogen-doped titanium oxide. In the setup of lithium ion battery, the capacity as cathode of the material increased with the doped concentration of nitrogen. In addition, direct nitridation of macroporous titanium oxide using the gas phase reaction with ammonia has also been established.

  5. Development of light-transmitting heat-insulation materials using novel hybrid gels

    Grant number:20350094  2008 - 2010

    NAKANISHI Kazuki

      More details

    Authorship:Principal investigator 

    Grant amount:\19240000 ( Direct Cost: \14800000 、 Indirect Cost:\4440000 )

    Light-transmitting, low-density organic-inorganic hybrid solid materials suitable for heat-insulation were obtained in the methylsilsesquioxane system via one-step synthesis using surfactants and urea as additives followed by either super-critical or ambient evaporation drying of the solvent. Gels with hierarchiall macro-and mesopores have also been synthesized by careful tuning ofthe compositions and reaction conditions. The relation between gas pressure and thermal conductivity of the above materials have been investigated in relation to their pore structures.

  6. Development of Nano-reaction Supports Using Hierarchically Porous Structure

    Grant number:15206072  2003 - 2005

    NAKANISHI Kazuki

      More details

    Authorship:Principal investigator 

    Grant amount:\49140000 ( Direct Cost: \37800000 、 Indirect Cost:\11340000 )

    Porous silica gels having sharply distributed macropores were prepared by a sol-gel reaction accompanied by a phase separation. Laser scanning confocal microscopy was utilized to obtain a series of thin-sliced images of the gels, from which the three-dimensional configuration was reconstructed. On the three-dimensional configuration, a statistical processing has been performed to extract size distribution of pores and gel skeletons as well as porosity, which have been conventionally measured by indirect method. Additional analysis on local surface curvatures gave information on mean curvature and Gauss curvature, which lead to the quantitative evaluation of the geometrical features of macroporous network. Liquid flow behavior was examined using real and simulated pressure drops against porosity.

  7. 共連続多孔質ゲルのマイクロチップ化

    Grant number:14655241  2002 - 2003

    萌芽研究

    中西 和樹

      More details

    Authorship:Principal investigator 

    Grant amount:\3200000 ( Direct Cost: \3200000 )

    溶融石英基板に幅あるいは直径10〜50ミクロンの矩形の溝あるいは円形の孔を穿った、上面開放型マイクロチップを微細加工した。また同等な内径を有する溶融シリカキャピラリーを用意した。この微細加工基板に必要に応じてシランカップリング反応を用いて疎水処理(オクタデシルシリル基による表面修飾)を施した。メチルトリメトキシシランあるいはテトラメトキシシランを出発物質とする相分離を伴うゾル-ゲル反応系を用いてマクロ多孔構造を作製し、走査型電子顕微鏡によって乾燥試料を観察すると共に、ゲル骨格内あるいはマクロ孔内にフルオレセイン溶液を導入した後、レーザー励起による蛍光を共焦点顕微鏡で観察することにより、多孔構造の3次元観察と界面付近の構造の観察を試みた。
    相分離によって自発的に形成される相領域(ドメイン)の特性長(典型的に構造周期の一波長分)が、溝の幅やキャピラリー内径より十分小さい間は、微小界面の影響によるドメインの局所変形や流動は、壁面近傍のみに限定される。ところが特性長と制限空間のサイズが同程度に達すると、反応系は自発的なドメイン形成よりも、容器壁への濡れ転移を起こすことにより、容器壁に均一なコート層を形成する。また制限空間のサイズが100ミクロン程度以上の場合には、粗大化して流動するドメインの形態に重力の影響が認められ、特に濡れ転移を伴う場合には、変形の度合いは特性長の数倍にも及んだ。これらの変形過程は、相領域形成とゾル-ゲル転移による構造凍結の競争によって起こるため、相分離開始からゾル-ゲル転移までの時間が短い反応系ほど、局所的な変形は抑制された。したがって、共連続構造のゲル材料をマイクロチップ化するためには、界面構造の均質化と重力の影響の軽減が重要な因子となることが分かった。

  8. Development of monolithic silica columns in capillary for high-speed and high-performance HPLC

    Grant number:12554032  2000 - 2002

    TANAKA Nobuo

      More details

    Authorship:Coinvestigator(s) 

    The development of porous monolithic silica columns in capillary for micro-HPLC was studied to achieve higher performance than columns packed with particles. Following experiments were carried out.
    (1) Preparation of a monolithic silica column in a capillary from alkoxysilanes.
    (2) Preparation of monolithic silica columns in capillaries of various sizes, 25-250 μm.
    (3) Study on the effect of domain size (through-pore size + silica skeleton size) and the ratio between through-pore size and skeleton size on the performance.
    (4) Preparation of ultrahigh efficiency monolithic silica columns.
    (5) Preparation of monolithic silica columns showing high efficiency in a short time.
    (6) Study on the factors determining band-broadening in a monolithic silica column.
    (7) Evaluation of monolithic silica columns in micro-HPLC and CEC.
    (8) Application of monolithic silica columns for the separation of various types of compounds including bases, dissociable compounds, and hydrocarbons.
    Following results were obtained.
    (1) It is possible to prepare network-type monolithic silica attached to the tube wall of fused silica capillary having 50-250 μm diameter.
    (2) Decrease in domain size showed similar effects as the decrease in particle size in a particle-packed column, causeing higher column pressure drop and higher column efficiency.
    (3) A monolithic silica capillary column of 100 μm, 250 cm gave 200, 000 - 300, 000 theoretical plates with to = 1000 s.
    (4) A monolithic silica capillary column with through-pores = 1.5 μm and skeleton size 0.8 μm gave 10.000 theoretical plates with to = 15 S.
    (5) The band-broadening in a monolithic silica column is dominated by A-term, or the contrubution of slow mass transfer in mobile phase, especially when the monolith possesses large through-pore size. Monoliths having small domain size showed the major contibution of stationary phase mass transfer.
    (6) Hybrid-type monolithic silica columns showed high performance for the separation of various types of compounds including bases, b-blockers, steroids, ketones, phthalates, aicohols, and hydrocarbon of various structures.
    Monolithic silica columns in 200 μm capillary can show performance 2 - 3 times higher than particle-packed columns under common conditions and are relatively easy to use. They can be applied for the separatin of a wide range of compounds. Thus they are close to practical use. (1) Preparation of larger-sized capillary, (2) various surface monofication by on-column reactions(3) optimization of domain structures, and (4) theoretical and experimental study on band-broadening in monolithic silica columns will be practical and basic subjects to study in this area. Other study will include the preparation of monolithic silica in a chip channels and multidimensional chromatography in a microscale HPLC.

  9. ORDER FORMATION OF INORGANIC SOL-GEL SYSTEM IN CONFINED SPACES

    Grant number:12450268  2000 - 2001

    NAKANISHI Kazuki

      More details

    Authorship:Principal investigator 

    Grant amount:\12400000 ( Direct Cost: \12400000 )

    Macroporous gel samples in the systems of silica or siloxane-based organic-inorganic hybrid were synthesized in small confined spaces of slab, thin columnar and short columnar shapes. In the slab shaped confined spaces with the thickness up to 30 microns, the characteristic size of phase separation frozen in the gel structure became coarser with a decrease in the thickness of the confined space both in silica or hybrid systems. On hydrophobized container walls, the formation of skin layer was observed in the case of hybrid composition, which was accompanied by the depletion layer and columnar phase separated domains in the vicinity of the container walls. Detailed analysis of these structures by 3-D observation with laser scanning con focal microscopy revealed that the phase separation was affected by the presence of walls that cause surface-spinodal wave. As a result of superposition of the co-continuous domain structure and the layer-like surface-induced structure, the depletion layer and the columnar deformed domains were formed. On the other hand, on hydrophilized container walls, the gel domains were chemically bonded without forming the skin layer. Depletion layers and columnar deformed domains similar to the case of hydrophobized walls were observed. However, in this case, the depletion layers were formed as a result of compromise between repulsive interaction between gel domains and walls and chemical anchoring of the domains on the silanol-containing walls. Unique very fine phase separated structures were observed when the confined space was in the same dimension as the size of phase separated domains.

  10. メゾ凝集と相分離に基づく規則的多重細孔材料の作製

    Grant number:11875140  1999

    萌芽的研究

    中西 和樹

      More details

    Authorship:Principal investigator 

    Grant amount:\2100000 ( Direct Cost: \2100000 )

    自己組織化したメソ構造のテンプレートとして、ハロゲン化アルキルトリメチルアンモニウムを選び、これを酸性触媒下アルコキシシランを出発物質とするシリカのゾル-ゲル過程に共存させて、相分離の誘起の有無およびメソ孔構造の特性長と規則性を調べた。ゾルーゲル反応によって得られたゲルは、乾燥後600℃において熱処理を行い、界面活性剤を除去した後にX線回折測定によるメソ孔の規則性の評価と、電子顕微鏡及び窒素吸着法による細孔構造の評価に供した。まず、ゲル形成時反応温度が高いほど、相分離によるマクロ孔構造の得られる出発組成領域は広くなったが、反面メソ孔構造の規則性は低くなった。界面活性剤に含まれるハロゲン化物イオンについては、塩素と臭素についてメソ構造形成に対する効果には差異が認められなかったが、相分離傾向に関してはイオン半径の小さい塩化物イオンの方が強くなった。また、アルキル基の影響を炭素数を16および18の間で比較したところ、炭素数18の界面活性剤を共存させた試料がより高いメソ孔容積を示し、相分離をも助長することが明らかになった。X線回折による規則性の高さは、ほぼ相分離傾向と一致していた。結論として、長いアルキル鎖と小さい対イオンを含み、シリカ重合対との相互作用が強い界面活性剤ほど、規則性の高いメソ孔構造を誘起するとともに相分離を助長することが分かった。本年度研究では、研究計画全体のうちバルク体ゲルにおける規則的多重細孔構造の発現を確認するにとどまったが、同様の原理は薄膜についても適用可能と考えられる。

  11. Ecomaterial Technology for Fluoride-polluted Ground Water in China

    Grant number:10041147  1998 - 1999

    TABATA Masahiro

      More details

    Authorship:Coinvestigator(s) 

    Since the cause of various health problems in the most areas of China is due to the high fluorine and arsenic content in drinking water, the principal means of prevention is to decrease the concentration of fluorine and arsenic in drinking water. To remove pollutants such as fluorine and arsenic from ground water in China, it is necessary to clear up the following problems : energy saving, resources savings and environmental protection.
    In this research project, we assessed the systems of pollutants removal from ground water from the view point of environmentally conscious technology. Results of this research project are summarized as follows :
    (1) Problems of fluorine and arsenic in China are quite serious conditions. Therefore, water treatment technique adapted to economic and technological conditions of China is required.
    (2) To remove fluorine in polluted water, conversion reaction of calcium phosphates is quite useful. Calcium phosphates is converted to fluoroapatite (FApCaィイD210ィエD2(POィイD24ィエD2)ィイD26ィエD2FィイD22ィエD2: Ap = apatite), which is one of natural fluoride resources. Using this reaction, fluoride ions in drinking water is removed as Fluoride-apatite with high efficiency.
    (3) It is appeared that waste from marine products industry, such as fish bone and shells, are able to use start materials for the removal of fluorine from polluted water.

  12. Development of porous silica rod columns for higher performance of HPLC

    Grant number:09554050  1997 - 1999

    TANAKA Nobuo

      More details

    Authorship:Coinvestigator(s) 

    (1) Three types of monolithic silica columns derivatized to C18 phase were prepared.
    (2) The continuous silica columns having micrometer-size silica skeletons and micrometer-size through-pores gave higher efficiency and much lower pressure drop on the basis of the small-sized skeletons with much higher through-pore size/skeleton size ratios than conventional particle-packed columns.
    (3) Silica rod columns prepared in a mold and covered with heat shrinking PTFE tubing showed nearly an order of magnitude lower flow resistance and much higher column efficiency than conventional columns packed with 5 μm particles at high linear velocity of the mobile phase.
    (4) Silica monoliths prepared in a fused silica capillary showed even lower pressure drop.
    (5) The column efficiency of the capillary monolith was lower than those prepared in a mold, especially at high linear velocity, presumably due to the presence of much larger through-pores.
    (6) The silica rods covered with PEEK to be a prototype product showed higher flow-resistance than the other monolithic silica columns, but they still showed higher column efficiency and lower pressure drop than popular 5μm silica packing materials for reversed-phase liquid chromatography.
    (7) The silica monolith in capillary can also be used in CEC to generate much higher column efficiency.
    (8) The silica monoliths showed much higher performance for polypeptide separations than current HPLC packing materials, providing the shortening of separation time by a factor of three or more.
    (9) The optimization and characterization of silica monoliths in terms of structural and chromatographic properties will lead to the development of columns for HPLC and CEC of much higher performance.
    (10) The monolithic columns will provide high performance (with current HPLC instrumentation) that is comparable with that of ultrahigh pressure liquid chromatography or CEC.

  13. Development of mesoporous materials by solid-liquid reactions within gel network

    Grant number:09555190  1997 - 1998

    NAKANISHI Kazuki

      More details

    Authorship:Principal investigator 

    Grant amount:\2300000 ( Direct Cost: \2300000 )

    The mesopore formation behavior in alkoxy-derived wet silica gels having co-continuous macropores has been investigated under varied conditions of aging. The starting gels were prepared via sol-gel route which include phase separation, and were aged under neutral to weakly basic conditions either by external addition or internal generation of ammonium hydroxide. The pH values of mother liquor of gels prepared in the presence of urea increased up to 10 by the thermal decomposition. Under non-hydrothemal conditions, the mesopore evolution depended only on pH values and temperatures during aging, and no substantial differences were recognized in the drying shrinkage and heat-evolution between the external and internal methods. In the additional hydrothermal aging performed with urea-containing gels, a significant acceleration of mesopore evolution rate was observed with an increase of aging temperature. At 200。C, the final size of mesopores reached 50nm with a marked decrease of their volume fraction. Above 200。C, the inner part of columnar gel skeletons eluted out and reprecipiated on their outer surface, thus resulted in the hollow columns with their walls consisting of granular building units less densely aggregated. The crystallization of the gel sample, however, was never observed possibly due to high purity of the gel samples. In contrast, the amorphous titania gels crystallized more easily under hydrothermal conditions.

  14. 液相法二重細孔シリカの分離機能

    Grant number:09750751  1997 - 1998

    奨励研究(A)

    中西 和樹

      More details

    Authorship:Principal investigator 

    Grant amount:\2400000 ( Direct Cost: \2400000 )

    ケイ素アルコキシドの加水分解・重縮合反応においで、ゾル-ゲル転移時に相分離を同時に誘起することのできる条件を選び、マイクロメートル領域の共連続ドメイン(ゲル相および溶媒相)を持つゲルを作製し、さらに密閉条件下で種々のbHおよび温度で熟成することにより、乾燥・熱処速後に形成されるメゾ細孔耕造を併せ持つ、二重細孔ゲルを作製した。この方法により、2μmのシリカ骨格と3μmのマクロ細孔および直径12nmのメゾ細孔を併せ持つ二重細孔ゲルを毛細管中で作製し、シランカップリング処理によって表面を疎水化した後に、液体クロマトグラフィーカラムとしての分離性能を評価した。毛細管壁とゲルの密着性が悪く大きい間隙が観察されたカラムでは、HPLCモードの分離牲能は試料流速に強く依存し、理論段高の絶対値も大きかった。電算クロマトグラフィーに対する適用では、シリカゲル中の金属不純物が極めて少ないために、従来カラムよりも低い電気浸透流の値しか得られないが、分離性能そのものは従来カラムと同等あるいはそれ以上になった。また、アルキル基を有するケイ素アルコキシドを用いて、同等のマクロ孔構造を持つ毛細管カラムを作製したところ、毛細管壁とゲルの間隙はゲルの有するマグロ孔と同じ程度の大きさになった。このカラムは、HPLCモードにおいても分離性能の試料流速による変化が少なく、また電気クロマトグラフィーにおいても、優れた分離特性を示すことがわかった。

  15. Development of Novel Inorganic Material for Chromatographic Column Without Particle Packing

    Grant number:07555480  1995 - 1996

    SOGA Naohiro

      More details

    Authorship:Coinvestigator(s) 

    Tetramethoxysilane was hydrolyzed in thepresence of polyethylene oxide having an average molecular weight of 10000 using acetic acid as a catalyst, which gave a wet silica gel with inetrconnected macropores about 2mum wide. The gel was subsequently immersed in aqueous solutions of ammonia with varied concentration for varied periods, then dried by evaporating the solvent, and finally heat-treated at 600゚C for 2 hours. The resultant gel retained narrowly distributed mesopores with their median size distributing from 5 to 20nm. The rod-shaped gel thus obtained was clad with a thermoshrinking resin on its side wall, suface-modified by a flow reaction with silane coupling agents, equipped with connecting devices for an ordinary HPLC apparatus, then the separation performance was investigated.
    A mixture of alkylbenzenes was analyzed using the rod-shaped column with the average macropore diameter of 1.6mum and mesopore diameter of 11nm. The pressure drop for the rod-shaped colummn at the same sample flow rate was less than half that of conventional particle-packed columns. Furthermore, the height equivalent to theoretical plate (HETP) remained almost unchanged for the rod-shaped column between 1mm/s and 5mm/s of linear flow rate, whereas that of conventional particle packed columns increased almost linearly with the flow rate. As a result, the HETP of the rod-shaped column became five times smaller than that of conventional ones. Simmilar difference in the pressure drop and the flowrate dependence of HETP was obsereved also in the case of separation of insulin. These results indicate that the rod-shaped column gives almost an order better separation performance than conventional ones. The superiority of the rod column in the high speed separation was experimentally confirmed to be due to the existence of thin silica skeleton associated with high fraction of macropores.

  16. 界面活性剤と無機高分子の相互作用に基づくゾル-ゲル反応

    Grant number:07750751  1995

    奨励研究(A)

    中西 和樹

      More details

    Authorship:Principal investigator 

    Grant amount:\900000 ( Direct Cost: \900000 )

    非イオン性界面活性剤であるポリオキシエチレンノニルフェニルエーテルを、シリコンアルコキシドの加水分解・重合過程に共存させ、シリカ重合体と界面活性剤分子間のコンプレックス形成によって起こる相挙動を調べた。エチレンオキシド単位を平均70個もつ親水性の高い界面活性剤では、低分子量ポリエチレングリコールを共存させた場合と同様に、中間的な界面活性剤/シリカ比の比較的狭い領域において、ゾル-ゲル転移と同程度の時間スケールで相分離が起こり、相分離による絡み合い構造がゲル構造として観察された。エチレンオキシド単位が10程度に短い場合、ゾル-ゲル転移の開始は相分離に対して、界面活性剤/シリカ比とともに単調に遅くなり、より高い界面活性剤/シリカ比およびより広い溶媒分率において絡み合い構造が形成された。また反応温度の上昇とともに、両系ともにより溶媒分率の高い組成において絡み合い構造が生じた。
    反応開始からコンプレックス形成およびゲル化に至るまでのシリカ重合体の構造を、小角X線散乱法によって実時間観察した結果、加水分解反応開始直後から、シリカ重合体と界面活性剤は相互作用を示すことが明らかになった。特に親水鎖の短い界面活性剤においては、その水溶液中でのミセルサイズにほぼ対応する不均一構造を形成しながら、シリカ重合体の成長が進んだ。親水鎖が長い場合にはメゾ細孔容積は界面活性剤濃度にほとんど依存しないが、この系のゲルにおいてはメゾ細孔容積は界面活性剤濃度に比例して増加した。したがってマクロ孔をもったシリカゲルのメゾ細孔容積を、ミセル形成を利用して制御できることが明らかになった。

  17. Preparation and Characterization of Transparent Magnetic Oxide Meterials

    Grant number:06453122  1994 - 1996

    SOGA Naohiro

      More details

    Authorship:Coinvestigator(s) 

    Transparent magnetic oxide materials are useful as magnetooptical devices and windows for shielding of magnetic fields. The aim of the present research is to prepare new transparent magnetic oxide materials and to characterize the magnetic, optical, and magnetooptical properties of the resultant materials. The main results of the research can be summarized as follows :
    (1) Faraday effect measurements have been carried out at room temperature for some sodium borate glasses containing Eu^<2+> ions prepared under a reducing atmosphere. The wavelength dependence of the Verdet constant is analyzed in terms of a theory derived by Van Vleck and Hebb to obtain effective transition wavelength of the 4f^7*4f^6 5d transition which canuses the Faraday effect of Eu^<2+> in the visible range. The effective transition wavelength increases with an increase in the optical basicity of glass. This phenomenon is explained in terms of the crystal field theory ; because the splitting of 5d levels is larger in the glass with larger optical basicity, the energy required for the 4f^7*4f^6 5d transition decreases as the optical basicity of glass increases. The magnitude of Verdet constant increases with an increase in the effective transition wavelength when the concentration of EuO remains constant.
    (2) We have examined the effect of heat treatment temperature and time on the magnetic properties of rapidly quenched oxides with compositions close to ZnFe_2O_4, which show high magnetization even at room temperature as we found. In particular, an attention is focused on the oxide with nominal composition of 60ZnO・40Fe_2O_3. X-ray diffraction, Zn K-edge extended X-ray absorption fine structure (EXAFS), Mossbauer spectroscopy, and magnetization measurements are carried out to clarify the variation of crystal structure and magnetic properties with heat treatment. The rapidly quenched specimen contains zinc ferrite with lattice parameter 0.05% smaller than that of ZnFe_2O_4 as the main phase, and exhibits the magnetization of 23.8 emu/g at room temperature. The X-ray diffraction, EXAFS and Mossbauer measurements suggest that the high magnetization is brought about by the Fe^<3+> ion clusters with the Zn^<2+> ions occupying octahedral sites as well as the solid solution of Fe_3O_4 in the ZnFe_2O_4. As the heat treatment temperature increases, the room temperature magnetization decreases sluggishly below 500゚C and decreases sharply above 600゚C when the heat treatment time is 2h. The variation of EXAFS and Mossbauer spectra with heat treatment temperature suggests that the decrease of magnetization below 500゚C corresponds to the transfer of Zn^<2+> ions from octahedral to tetrahedral sites while the rapid decrease of magnetization above 600゚C is caused by the oxidation of Fe^<2+> to form ZnFe_2O_4 with normal spinel structure. A complicated behavior is observed at around 550゚C ; the magnetization once increases at 550-600゚C and then decreases rapidly as the heat treatment temperature increases. We speculate that at the initial stage of the oxidation of Fe^<2+>, vacancies of Fe^<3+> ions at the octahedral sites are created, leading to the increase of magnetization.

  18. X線小角散乱法による無機非晶質ゲルのメゾ細孔形成過程の解析

    Grant number:06750859  1994

    奨励研究(A)

    中西 和樹

      More details

    Authorship:Principal investigator 

    Grant amount:\900000 ( Direct Cost: \900000 )

    数種の水溶性有機高分子、あるいは部分的に加水分解を受けた後重縮合するシリカと親和性の低い極性溶媒の共存下において、珪素アルコキシドを加水分解することにより、ゾル-ゲル転移とスピノ-ダル分解を並行して誘起し、溶媒置換操作に好適なマイクロメートル領域の絡み合い多孔構造を持つシリカゲルを得た。所定の組成においてゾル-ゲル反応および熟成後、湿潤状態のゲルを様々なpHを持つ水溶液に浸漬して溶媒置換を行った。まず、十分平衡な構造が得られる浸漬時間を決定し、続いて適切な時間間隔毎に、溶媒置換中のゲルのX線小角散乱を湿潤状態のままで測定した。散乱データをPorodプロットし、散乱プロファイルの傾きからフラクタル構造の変化を見積もったところ、弱酸性および中性条件では検出し得るほどの構造変化は認められなかった。塩基性条件下での置換においては、湿潤状態では次数約2の体積フラクタル的構造であったものが、浸漬後数時間で、細かい構造から順に表面フラクタルの構造へと変化してゆくことが明らかになった。浸潤状態でのフラクタル次元は、出発組成や共存高分子の種類によって差異が認められたが、塩基性溶液中での溶媒置換によってほぼ同等のメゾ細孔構造を得ることが可能であった。最終状態の細孔構造は、置換溶媒のpHと置換時の温度によって一義的に決まるが、置換溶媒の量が少ない場合には、最終構造に至るまでの構造変化は緩慢に起こることが明らかになった。これは構造変化の律速段階が溶出過程であることを示唆していた。

  19. Development of bio-science materials by designing porous structure and surface property of oxide gels.

    Grant number:05555170  1993 - 1994

    Grant-in-Aid for Developmental Scientific Research (B)

    SOGA Naohiro

      More details

    Authorship:Coinvestigator(s) 

    Silica gels with controlled interconnected pores in micrometer range have been prepared by hydrolyzing alkoxysilane in the presence of a certain kind of water-soluble polymer using acetic acid as a catalyst. The time-resolved laser light scattering measurements of gelling solution revealed that the interconnected structure is developed when the phase separation by the spinodal mechanism and the sol-gel transition take place almost concurrently. The soaking of gels, prior to the evaporation of the solvent, in ammonia solutions with various concentration and volume ratio to the gel piece at various temperatures resulted in the modification of nanometer range pore structures into well-defined mesopores up to 20nm in diameter, after appropriate drying and heat-treatment. The higher the ammonia concentration, and the higher the soaking temperature, the larger the pore size became. When the soaking was carried out with smaller volume of solvent against a gel piece, the structural change was retarded. This result indicates that the dissolution of silica from the wet gel surface into the external solvent is the rate determining step of the whole structure evolution due to dissolution and re-precipitation of silica. The soaking treatment could completely eliminate the micropores in the gel specimen. An evaluation of silica monoliths having double pore sturcures thus prepared was carried out as a chromatographic column material. After chemical modification of hydrophilic silica gel surface with octadecyl and methyl ligands, a rod shaped monolith was clad with polymer, and was equipped to an LC apparatus. The separation factors for alkylbenzens of the monolithic column was almost the same as that of conventional packed beads column, however, the applied pressure for the same sample flow rate was reduced to 1/2 to 1/3 of conventional one.

  20. 無機ゾル-ゲル系におけるスピノ-ダル分解過程の光散乱法による解析

    Grant number:05750610  1993

    奨励研究(A)

    中西 和樹

      More details

    Authorship:Principal investigator 

    Grant amount:\1100000 ( Direct Cost: \1100000 )

    数種の水溶性有機高分子あるいは極性の高い溶媒の共存下において、珪素アルコキシドを加水分解することにより、ゲル化とスピノ-ダル分解がほぼ同時に起こり得る条件を探索し、マイクロメートル領域の多孔構造形成過程を追跡した。相分離によって起こる濃度揺らぎの時間発展を、He-Neレーザーを光源とし、フォトダイオードアレイを検出系とした光散乱装置を用いて、1秒ごとに時間分割追跡した。まず、相分離初期の濃度揺らぎの時間発展が指数関数的であり、波長一定の期間が存在することを確認した。このことは、相分離過程がスピノ-ダル分解機構に従って起こっていることを示していた。次に、出発組成や反応温度を変化させて、ゾル-ゲル転移と相分離過程の開始時期の相対関係を変化させたところ、以下のことが明らかになった。
    (1)相分離過程がゾル-ゲル転移よりも十分早く開始すると、散乱プロファイルは多くの液-液相分離系で見られるのと同様な時間変化を示し、その後期過程においてゾル-ゲル転移に起因すると推察される構造の凍結が起こった。
    (2)ゾル-ゲル転移による網目形成に並行して相分離過程が開始すると、ドメインの形成過程は相分離開始が遅いほど減速され、構造凍結はより早く起こった。
    (3)ゾル-ゲル転移が開始して十分時間が経ってから相分離過程が進行する場合には、ほとんど濃度揺らぎの周期波長は変化しないまま、網目内の濃度コントラストだけが拡大して、比較的規則正しい多孔構造が形成された。

  21. Development of materials with ordered structure through phase separation of inorganic-organic mixed sol-gel system

    Grant number:02555161  1990 - 1991

    Grant-in-Aid for Developmental Scientific Research (B)

    SOGA Naohiro

      More details

    Authorship:Coinvestigator(s) 

    A method of preparing silica gels with micrometer-range inte-rconnected pores by hydrolyzing alkoxysilanes under coexistence of water-soluble polymers has been investigated in detail. Following results have been obtained ;
    1. Many kinds of water-soluble polymers that have substantial solubility in--water-alcohol mixed solvent can be used in the process.
    2. Hydrolysis of alkoxysilanes under strongly acidic condition is favored but polycondensation may be conducted also under more basic condition.
    3. Light scattering profiles of gelling solution exhibited first a continuous development of concentration fluctuation with a fixed periodic wavelength, second a parallel increase of fluctuation and periodic wavelength, and finally a fixation of periodic wavelength and further increase of concentra tion difference. These changes indicate a concurrent occurrence of spinodal decomposition and sol-gel transition in the reacting system.
    4. Morphology of gels can be controlled by changing starting composition and reaction temperature. Reaction conditions which make a phase separation to occur earlier relative to a sol-gel transition result in coarse morphologies and vice versa. Polymers with high solubility in water-alcohol mixed solvent are favored to obtain gel morphologies with better reproducibility.
    5. By exchanging solvent phase in wet gels with micrometer-range interconnected pores, the volume and distribution of nanometer-range pores can be, modified to a large extent. This process enables one to tailor pore structure of gels both in micrometer- and nanometer-ranges.

  22. 超急熱・急冷法による混合陰イオン無機非晶質の作製と性能評価

    Grant number:01604563  1989

    曽我 直弘

      More details

    Authorship:Coinvestigator(s) 

    非晶質材料を作製する際、溶融状態において熱力学的平衡状態を取らせず、また急速に冷却するという極限条件を採用することで新しい機能をもたせる可能性がある。これまで化学結合様式から考えて超陰イオン伝導性が期待できるフッ化物系の非晶質について、超急熱・急冷法の条件のもとで試料作製を試み、高イオン伝導度ガラスを得ることができた。本研究では、さらに導電率が高く、安定性の良いガラス組成を探索する目的で種々のカチオンを導入したオキシフルオライドガラスを作製し、その構造や結合に対する知見を得、フッ化物イオン伝導のメカニズムを検討することを目的とした。得られた成果は次の通りである。
    (1)ZnF_2-PbF_2-SiO_2系、(2)MnF_2-PbF_2-SiO_2系、(3)BiF_3-PbF_3-SiO_3系のガラスを作製し、その電気伝導測定を行った。この系を選んだのは、前年度に報告したように各成分の分極率が大きく、フッ化物イオン伝導性が向上すると考えたからである。測定結果を分極率に対してプロットしたところ良い相関が得られたことより、分極率の大きさもフッ化物イオン伝導に寄与することが明らかになった。
    (2)フッ素と酸素が共存する、いわゆる混合アニオン効果の原因を探るためXPSスペクトルの測定を行った。フッ化物ガラスにSiO_2を導入していくとFisスペクトルのピ-クが低結合エネルギ-側にしていき、SiO_210モル%付近から高結合エネルギ-側にも新たなピ-クが生じた。前者のピ-クはMnやPbに弱く結合した荷電担体となりうるフリ-のFイオンによるもので、後者のピ-クはSiO_2ネットワ-ク中のSiに強く結合したFイオンによるものである。つまり、導電率が増加した要因はフリ-のFイオンのピ-ク位置が低結合エネルギ-側に変化していることと関係していると考えられた。この効果はPbの存在下で顕著になったが、電導度の値の上昇も良い対応関係にあったことは特筆すべきである。

  23. 原子レベルからみたセラミックス粒界ガラス相の破壊挙動

    Grant number:01647510  1989

    平尾 一之

      More details

    Authorship:Coinvestigator(s) 

    セラミックスの破壊強度は雰囲気の影響を大きく受ける。この効果はガラス相が粒界相に存在する場合、顕著であってガラス相の水分による応力腐食がクラック進展の主因であるとも、いわれている。このようなガラスの破壊挙動を調べるために、従来の弾性体モデルではなく、化学結合を考慮した原子や分子レベルからの破壊挙動のモデルをまず組み立てた。具体的には結晶化しやすいガラスとして高アルカリ含有のホウ酸塩やケイ酸塩ガラス、粒界にガラス相を多く含む窒化ケイ素、人工骨セラミックスであるアパタイトなどを選び、安定破壊をおこさせ、その塑性変形挙動を調べ、モデル化すると共にクラック先端での観察をTEMやコンピュ-タシミュレ-ションで行い破壊のメカニズムを原子レベルで調べた。コンピュ-タシミュレ-ションは分子動力学法を用いて行った。所定の組成のガラスを約千個ほどの原子を用いて基本セル内に作成し、2軸方向(xy表面)だけ境界条件をはずし自由表面にしたものをx軸とy軸方向から2軸圧縮応力や引っ張り応力をかけた。応力をかける温度は400℃と1500℃で応力にともなう原子の拡散や内部応力の変化を求めた。その結果を以下に示す。
    (1)ガラスの温度を1500℃まで上げ、融液状態にしたあとX軸Y軸のスケ-ルを20%減少させることにより2軸圧縮応力をかけた。応力をかけた瞬間、内部応力は非常に高くなるが、Z軸方向の応力は4PSで、X軸方向の応力は15PSで原子の移動に伴い応力が緩和していくことがわかった。
    (2)400℃では固体的な挙動を示した。応力印加後、5PSで内部応力が急激に減少し、塑性変形のような挙動がみられた。しかし、未だ内部応力が大きいにもかかわらず、Siや酸素の拡散は少なく、15PSからは殆ど移動はみられないことから考えてケイ酸塩ガラスは塑性変形しにくい。

  24. Studies on Middle Range Structure of Amorphous Inorganic Materials and its Controlling

    Grant number:63430014  1988 - 1990

    Grant-in-Aid for General Scientific Research (A)

    SOGA Naohiro

      More details

    Authorship:Coinvestigator(s) 

    Amorphous oxides and fluorides were prepared by using twin-roller quenching, sputtering and sol-gel method. Several spectroscopic studies and measurements of physical properties were carried out on the resultant amorphous materials to obtain middle range structure of these materials and to discuss the relation between the structure and the properties. The results obtained are as follows.
    1. High ionic conductivity was observed in MnF_2-MnO-SiO_2 and MnF_2-PbF_2-SiO_2 glasses prepared by the twin-roller quenching method. It was revealed from XPS measurements that the fluoride ions occupy two kinds of sites in these oxyflouride glasses and fluoride ions in one of the two sites contribute to the high ionic conductivity. This aspect on the chemical state of fluoride ions was coincident with the result obtained by the molecular dynamics simulation.
    2. Mossbauer measurements were carried out on oxide glasses, silica gel, amorphous alloys and oxide crystals containing iron or europium. The bonding characteristics of iron and europium in these materials were discussed systematically.
    3. It was discovered for the first time that upconversion-pumped fluorescence takes place in some oxide glasses even at room temperature. The lattice vibrational energy and the strength of electron-phonon interaction in the oxide glasses were clarified from phonon sideband spectra. On the basis of the experimental results, the origin of appearance of the upconversion-pumped fluorescence was discussed.
    4. The work of fracture for soda borate glasses was measured using short-bar specimens with chevron notch. An inelastic phenomenon was observed in the boron oxide-rich glass.

  25. 超急熱・急冷法による混合陰イオン無機非晶質の作製と性能評価

    Grant number:63604557  1988

    曾我 直弘

      More details

    Authorship:Coinvestigator(s) 

    超急熱・急冷法を用いて非晶質材料を作製すると非平衡状態をかなり保持できるので、従来の溶融法では得られなかった新しい機能性をもたせる可能性がある。本研究では高いフッ化物イオン伝導性を有すると考えられた(A)MnF_2-PbF_2-SiO_2系、(B)ZnF_2-PbF_2-SiO_2系、(C)BiF_3-PbF_2-SiO_2系について、イメージ炉と双ローラー装置を用いた超急熱・急冷法により、非晶質試料を作製し、直流導電率及び光電子分光(XPS)測定を行った。(A)系はかなりの組成領域にわたってガラス化した。200℃での導電率および活性化エネルギーをSiO_2含有量に対してプロットしたところ、SiO_210モル%組成で導電率は極大値を、活性化エネルギーは極小値をとり、既に報告したMnF_2-MnO_2-SiO_2系と同様の混合アニオン効果が現れた。このガラス組成45MnF_2-45PbF_2-10SiO_2は、200℃での導電率が10^<-4>S・cm^<-1>とフッ化物ガラスの中でトップデータに属するものである。XPSスペクトルの結果、このガラス組成付近で2種類のフッ素イオンの存在が確認された。また分子動力学法コンピュータシミュレーションによりFイオンの動的挙動を解析したところ、あるサイトで振動しているFイオンと別のサイトへ拡散していくFイオンが存在するという同様の結果が得られた。以上の結果より、最高導電率を示した45MnF_2-45PbF_2-10SiO_2ガラスは、結合状態の異なるFイオンがガラス中に存在し、弱い結合力をもったFイオンが導電率を上げたためであると推察した。しかし、(B)系や(C)系のオキシフルオライドガラスでは明確な混合アニオン効果がみられず、電導率の向上は見られなかった。混合アニオン効果の発現を明らかにするため、Pbイオンの分極が系に及ぼす影響やカチオンの電子相互作用を検討するとともに、Fイオンの動的挙動をさらにコンピュータシミュレーションで詳しく調べて、高イオン伝導性をさらに高めるガラスの探索を行っていく。

  26. Behavior of Sputtered Species and Formation of Amorphous Films

    Grant number:62470063  1987 - 1988

    Grant-in-Aid for General Scientific Research (B)

    HANADA Teiichi

      More details

    Authorship:Coinvestigator(s) 

    1) Behavior of Sputtered Species During SIO_2 Sputtering
    In this study, the abundance distribuyion of nuetral sputtered species during SIO_2 sputtering was investigated by means of a quadrupole mass analyzer. The dependences of the abundance distribution upon O_2 content in the sputtering gas and upon the sputtering power were examined. SO, the neutral sputtered species during SIO_2 sputtering were determined to be Si, SiO, O. O_2. The ratio of the intensity of the mass spectrum for SiO to that for si increased with increasing O_2 content. The dependence of the abundance distribution upon O_2 content in the sputtering gas suggested that Si species reacted with O species to produce SiO species and that O_2 species were produced with the reaction between O species. The intensity of the mass spectra for both si and SiO species increased straightly with increasing the sputtering power, and then in had a plateau. This tendency was discussed in connection with sputtering process.
    2) Glow Discharge Mass Spectrometry During TeO_2 Sputtering
    The sputtered species furing TeO_2 sputtering was determined as a function of the oxygen partial pressure by using glow discharge mass spectrometry(GDMS). The oxygen content in the sputtering gas ranged from 0% to 100%. The ionic species during TeO_2 sputtering were found to be O_2^+, Ar^+, Ar_2^+, Te^+, TeO^+ and TeO_2^+. The ration of Te^+ to the total amount of Te^+, TeO^+ and TeO_2^+ decreased with increasing oxygen partial pressure. On the other hand, the opposite tendency was observed for the TeO^+ and the TeO_2^+ species. A fluorescence analysis was used in order to compare the composition of the sputtered species with that of the deposited thin film. This result suggests that the sputtered species react with oxygen on the substrate.

  27. 超急熱・急冷法による混合陰イオン無機非晶質の作製と性能評価

    Grant number:62604569  1987

    曽我 直弘

      More details

    Authorship:Coinvestigator(s) 

    熔融状態において熱力学的変更状態を取らせず, また急速に冷却するという極限条件を用いて新材料を創製できる可能性がある. そこで本研究では, 化学結合様式から考えて高陰イオン伝導性が期待できるオキシフルオライド系の複合陰イオン非晶質について, 赤外線集光型イメージ炉を用いた超急熱・急冷法の条件のもとで試料作製を試み, 電気伝導度測定と状態分析を行った. 組成として(A)MnF_2-MnO_2-SiO_2系および(B)MnF_2-PbF_2-SiO_2系を選び, その非晶質を作製した. この系を選んだのは, 通常の熔融法で, 5MnF_2-85PbF_2-10A1(PO_3)_3組成のガラスが10-S・cm-とフッ化物ガラスの中で最高のイオン伝導度を示しているが, イメージ炉急熱・急冷法を用いると更に高融点の組成を熔融させる事ができるばかりでなくMnやPbイオンを非平衡な状態で入れることができ, 一部のフッ化物イオンを不安定な状態にとどめ, フッ化物イオンの伝導度を向上させる期待がもたれるからである. 直流電導度の結果は(A)系のMnO_2-SiO_2系においては10^<-12>S・cm^<-1>以下であったがMnF_2を添加することにより200°Cで10^<-1>S・cm^<-1>と増加した. これは酸素とフッ素を混合させた方がフッ素イオン単独よりもイオン伝導度があがるということを示している. これらのXPSスペクトルを調べたところ, 酸素を共存させた時, フッ素の結合状態が多様化していることがわかった. 即ち, 強い結合と弱い結合が同時に存在し, その結果, 電導度が増加していると推察された. また(B)系では(A)系に比べて2桁以上の電導度の増加がみられた. これは分極率が高く結合強度の弱いPbF_2の添加がフッ化物イオン伝導の増加に寄与しているためと考えられた. 今後, 伝導のメカニズムをさらに明らかにしとイオン伝導度を向上させることを試みる.

  28. Chromatographic Application of Porous Silica with Controlled Structures

      More details

    Grant type:Competitive

▼display all

Industrial property rights 1

  1. シリコーン製モノリス体と多空間体との複合体およびその製造方法

    中西 和樹, 皆見 武志, 橋本 智佳子, 梅原 洋一, 金井 隆一

     More details

    Applicant:国立大学法人京都大学, 千代田化工建設株式会社

    Application no:特願2016-019383  Date applied:2016.2

    Announcement no:特開2017-136552  Date announced:2017.8

    J-GLOBAL

 

Teaching Experience (On-campus) 2

  1. 固体化学基礎論

    2020

  2. 無機化学1および演習

    2020

Teaching Experience (Off-campus) 1

  1. 無機材料化学

    京都大学大学院)

 

Media Coverage 1

  1. 日本経済新聞 Newspaper, magazine

    日本経済新聞  8面スタートアップ  2020.3

     More details

    Author:Other