Preparation of SiO2-TiO2 aerogels using supercritical impregnation

Satoshi Yoda; Katsuto Ohtake; Yoshihiro Takebayashi; Tsutomu Sugeta; Takeshi Sako; Tsugio Sato

doi:10.1023/A:1008731310240

Preparation of SiO₂-TiO₂ aerogels using supercritical impregnation

Satoshi Yoda, Katsuto Ohtake, Yoshihiro Takebayashi, Tsutomu Sugeta, Takeshi Sako, Tsugio Sato

Center for Exploration of New Inorganic Materials

Research output: Contribution to journal › Conference article › peer-review

25 Citations (Scopus)

Abstract

The preparation of SiO₂-TiO₂ aerogels by supercritical impregnation of titanium alkoxides into silica alcogels was investigated. A mixture of CO₂ and 2-propanol with dissolved titanium tetraisopropoxide modified with acetylacetone was used as the impregnation medium. Prior to the experiments, the supercritical behaviour of the impregnation solution was investigated. The microstructure and properties of aerogels prepared by the supercritical impregnation method were almost identical to those generated by the liquid impregnation. However, the time for impregnation was substantially decreased and the homogeneity of the impregnated titanium distribution on the aerogel increased.

Original language	English
Pages (from-to)	719-723
Number of pages	5
Journal	Journal of Sol-Gel Science and Technology
Volume	19
Issue number	1-3
DOIs	https://doi.org/10.1023/A:1008731310240
Publication status	Published - 2000 Dec
Event	10th International Workshop pn Glass and Ceramics, Hybrids and Nanocomposites from Gels - Yokohama, Jpn Duration: 1999 Sep 20 → 1999 Sep 24

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Chemistry(all)
Biomaterials
Condensed Matter Physics
Materials Chemistry

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title = "Preparation of SiO2-TiO2 aerogels using supercritical impregnation",

abstract = "The preparation of SiO2-TiO2 aerogels by supercritical impregnation of titanium alkoxides into silica alcogels was investigated. A mixture of CO2 and 2-propanol with dissolved titanium tetraisopropoxide modified with acetylacetone was used as the impregnation medium. Prior to the experiments, the supercritical behaviour of the impregnation solution was investigated. The microstructure and properties of aerogels prepared by the supercritical impregnation method were almost identical to those generated by the liquid impregnation. However, the time for impregnation was substantially decreased and the homogeneity of the impregnated titanium distribution on the aerogel increased.",

author = "Satoshi Yoda and Katsuto Ohtake and Yoshihiro Takebayashi and Tsutomu Sugeta and Takeshi Sako and Tsugio Sato",

note = "Copyright: Copyright 2005 Elsevier B.V., All rights reserved.; 10th International Workshop pn Glass and Ceramics, Hybrids and Nanocomposites from Gels ; Conference date: 20-09-1999 Through 24-09-1999",

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T1 - Preparation of SiO2-TiO2 aerogels using supercritical impregnation

AU - Yoda, Satoshi

AU - Ohtake, Katsuto

AU - Takebayashi, Yoshihiro

AU - Sugeta, Tsutomu

AU - Sako, Takeshi

AU - Sato, Tsugio

PY - 2000/12

Y1 - 2000/12

N2 - The preparation of SiO2-TiO2 aerogels by supercritical impregnation of titanium alkoxides into silica alcogels was investigated. A mixture of CO2 and 2-propanol with dissolved titanium tetraisopropoxide modified with acetylacetone was used as the impregnation medium. Prior to the experiments, the supercritical behaviour of the impregnation solution was investigated. The microstructure and properties of aerogels prepared by the supercritical impregnation method were almost identical to those generated by the liquid impregnation. However, the time for impregnation was substantially decreased and the homogeneity of the impregnated titanium distribution on the aerogel increased.

AB - The preparation of SiO2-TiO2 aerogels by supercritical impregnation of titanium alkoxides into silica alcogels was investigated. A mixture of CO2 and 2-propanol with dissolved titanium tetraisopropoxide modified with acetylacetone was used as the impregnation medium. Prior to the experiments, the supercritical behaviour of the impregnation solution was investigated. The microstructure and properties of aerogels prepared by the supercritical impregnation method were almost identical to those generated by the liquid impregnation. However, the time for impregnation was substantially decreased and the homogeneity of the impregnated titanium distribution on the aerogel increased.

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