Preparation of SiO2-TiO2 aerogels using supercritical impregnation

被引:25
作者
Yoda, S
Ohtake, K
Takebayashi, Y
Sugeta, T
Sako, T
Sato, T
机构
[1] Natl Inst Mat & Chem Res, Tsukuba, Ibaraki 3058565, Japan
[2] Tohoku Univ, Inst Chem React Sci, Sendai, Miyagi 980, Japan
关键词
aerogels; silica; titania; impregnation; supercritical drying;
D O I
10.1023/A:1008731310240
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
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.
引用
收藏
页码:719 / 723
页数:5
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