研究者詳細 - 中西　和樹

論文 - 中西　和樹

分割表示 412 件中 341 - 360 件目／全件表示 >>

Preparation of silicalite-1 within macroporous silica glass 査読有り

Shikata H, Nakanishi K, Hirao K

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY 19 巻 ( 1-3 ) 頁： 769 - 773 2000年12月

Preparation and chromatographic application of macroporous silicate in a capillary 査読有り

Ishizuka N, Nakanishi K, Hirao K, Tanaka N

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY 19 巻 ( 1-3 ) 頁： 371 - 375 2000年12月

Porous gels made by phase separation: Recent progress and future directions 査読有り

Nakanishi K

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY 19 巻 ( 1-3 ) 頁： 65 - 70 2000年12月

Membrane emulsification using sol-gel derived macroporous silica glass 査読有り

Fuchigami T, Toki M, Nakanishi K

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY 19 巻 ( 1-3 ) 頁： 337 - 341 2000年12月

Performance of a monolithic silica column in a capillary under pressure-driven and electrodriven conditions 査読有り

Ishizuka N, Minakuchi H, Nakanishi K, Soga N, Nagayama H, Hosoya K, Tanaka N

ANALYTICAL CHEMISTRY 72 巻 ( 6 ) 頁： 1275 - 1280 2000年3月

Formation of hierarchical pore structure in silica gel 査読有り

Nakanishi K, Takahashi R, Nagakane T, Kitayama K, Koheiya N, Shikata H, Soga N

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY 17 巻 ( 3 ) 頁： 191 - 210 2000年3月

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 23 巻 ( 1 ) 頁： 93-99 2000年1月

Monolithic silica columns for HPLC, micro-HPLC, and CEC 査読有り

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 23 巻 ( 1 ) 頁： 111 - 116 2000年1月

Tailoring mesopores in monolithic macroporous silica for HPLC 査読有り

Nakanishi K, Shikata H, Ishizuka N, Koheiya N, Soga N

HRC-JOURNAL OF HIGH RESOLUTION CHROMATOGRAPHY 23 巻 ( 1 ) 頁： 106 - 110 2000年1月

Aggregation behavior of alkoxide-derived silica in sol-gel process in presence of poly(ethylene oxide) 査読有り

Takahashi R, Nakanishi K, Soga N

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY 17 巻 ( 1 ) 頁： 7 - 18 2000年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Sol-Gel Science and Technology

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 29Si 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 Rg 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

Effect of nonionic surfactant on phase separation behavior in methylsiloxane sol-gel systems 査読有り

Nakanishi K, Miyawaki S, Soga N

KOBUNSHI RONBUNSHU 57 巻 ( 6 ) 頁： 396 - 401 2000年

Apatite formation on ethylene-vinyl alcohol copolymer modified with silane coupling agent and calcium silicate 査読有り

Oyane A, Minoda M, Miyamoto T, Nakanishi K, Kawashita M, Kokubo T, Nakamura T

BIOCERAMICS 192-1 巻頁： 713 - 716 2000年

A new monolithic-type HPLC column for fast separations

Cabrera K., Lubda D., Eggenweiler H., Minakuchi H., Nakanishi K.

HRC Journal of High Resolution Chromatography 23 巻 ( 1 ) 頁： 93 - 99 2000年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：HRC Journal of High Resolution Chromatography

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.

DOI： 10.1002/(SICI)1521-4168(20000101)23:1<93::AID-JHRC93>3.0.CO;2-2

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A new monolithic-type HPLC column for fast separations 査読有り

Cabrera K., Lubda D., Eggenweiler H.M., Minakuchi H., Nakanishi K.

Journal of Separation Science 23 巻 ( 1 ) 頁： 93 - 99 2000年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Apatite formation on ethylene-vinyl alcohol copolymer modified with silanol groups 査読有り

Oyane A, Minoda M, Miyamoto T, Takahashi R, Nakanishi K, Kim HM, Kokubo T, Nakamura T

JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 47 巻 ( 3 ) 頁： 367 - 373 1999年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Biomedical Materials Research

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-isocyanatopropyltriethoxysilane, 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. © 1999 John Wiley & Sons, Inc.

DOI： 10.1002/(SICI)1097-4636(19991205)47:3<367::AID-JBM11>3.0.CO;2-A

Sol-gel modification of silicone to induce apatite-forming ability 査読有り

Oyane A, Nakanishi K, Kim HM, Miyaji F, Kokubo T, Soga N, Nakamura T

BIOMATERIALS 20 巻 ( 1 ) 頁： 79 - 84 1999年1月

Performance of an octadecylsilylated continuous porous silica column in polypeptide separations 査読有り

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

JOURNAL OF CHROMATOGRAPHY A 828 巻 ( 1-2 ) 頁： 83 - 90 1998年12月

Structural study of mesoporous titania and titanium stearic acid complex prepared from titanium alkoxide 査読有り

Takahashi R, Takenaka S, Sato S, Sodesawa T, Ogura K, Nakanishi K

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS 94 巻 ( 20 ) 頁： 3161 - 3168 1998年10月

Preparation of macroporous titania films by a sol-gel dip-coating method from the system containing poly(ethylene glycol) 査読有り

Kajihara K, Nakanishi K, Tanaka K, Hirao K, Soga N

JOURNAL OF THE AMERICAN CERAMIC SOCIETY 81 巻 ( 10 ) 頁： 2670 - 2676 1998年10月

Chromatographic properties of miniaturized silica rod columns 査読有り

Ishizuka N, Minakuchi H, Nakanishi K, Soga N, Hosoya K, Tanaka N

HRC-JOURNAL OF HIGH RESOLUTION CHROMATOGRAPHY 21 巻 ( 8 ) 頁： 477 - 479 1998年8月

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