Effects of supercritical impregnation conditions on the properties of silica-titania aerogels

S. Yoda; K. Otake; Y. Takebayashi; T. Sugeta; Tsugio Sato

doi:10.1016/S0022-3093(01)00424-0

Effects of supercritical impregnation conditions on the properties of silica-titania aerogels

S. Yoda, K. Otake, Y. Takebayashi, T. Sugeta, Tsugio Sato

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

Abstract

The preparation of silica-titania aerogel by supercritical impregnation of titanium isopropoxide (TP) or modified with acetylacetone (TPAA) using flow type apparatus was performed. The influence of the physical state of TP/CO₂ TPAA/CO₂ mixture was investigated. Homogeneous and rapid impregnation on monolithic silica alcogel was achieved using supercritical TP/CO₂ or TPAA/CO₂ mixtures at the single phase condition (353 K, 20 MPa). Crystallization of impregnated titania using this system was attained by increasing temperature during the depressurization process after impregnation.

Original language	English
Pages (from-to)	8-12
Number of pages	5
Journal	Journal of Non-Crystalline Solids
Volume	285
Issue number	1-3
DOIs	https://doi.org/10.1016/S0022-3093(01)00424-0
Publication status	Published - 2001 Jun 1

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Materials Chemistry

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10.1016/S0022-3093(01)00424-0

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abstract = "The preparation of silica-titania aerogel by supercritical impregnation of titanium isopropoxide (TP) or modified with acetylacetone (TPAA) using flow type apparatus was performed. The influence of the physical state of TP/CO2 TPAA/CO2 mixture was investigated. Homogeneous and rapid impregnation on monolithic silica alcogel was achieved using supercritical TP/CO2 or TPAA/CO2 mixtures at the single phase condition (353 K, 20 MPa). Crystallization of impregnated titania using this system was attained by increasing temperature during the depressurization process after impregnation.",

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AU - Sugeta, T.

AU - Sato, Tsugio

PY - 2001/6/1

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AB - The preparation of silica-titania aerogel by supercritical impregnation of titanium isopropoxide (TP) or modified with acetylacetone (TPAA) using flow type apparatus was performed. The influence of the physical state of TP/CO2 TPAA/CO2 mixture was investigated. Homogeneous and rapid impregnation on monolithic silica alcogel was achieved using supercritical TP/CO2 or TPAA/CO2 mixtures at the single phase condition (353 K, 20 MPa). Crystallization of impregnated titania using this system was attained by increasing temperature during the depressurization process after impregnation.

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Effects of supercritical impregnation conditions on the properties of silica-titania aerogels

Abstract

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