Faculty Profiles - NAKANISHI Kazuki

Papers - NAKANISHI Kazuki

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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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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 ( > 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

Monolithic LC columns Reviewed

Tanaka N, Kobayashi H, Nakanishi K, Minakuchi H, Ishizuka N

ANALYTICAL CHEMISTRY Vol. 73 ( 15 ) page： 420A - 429A 2001.8

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

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

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

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

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

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

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Papers - NAKANISHI Kazuki