Supercritical drying of SiO2-TiO2 sol-pillared clays |
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| Authors: | K. Takahama M. Yokoyama S. Hirao S. Yamanaka M. Hattori |
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| Affiliation: | (1) Central Research Laboratory, Matsushita Electric Works Ltd, 1048 Kadoma, 571 Osaka, Japan;(2) Department of Applied Chemistry, Faculty of Engineering, Hiroshima University, 724 Higashi-Hiroshima, Japan |
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| Abstract: | The interlayers of montmorillonite clay were pillared with silica-titania sol particles by ion exchange in aqueous solutions. The water in the pillared clay was substituted with ethanol which was in turn extracted with CO2 under supercritical conditions. This drying procedure avoids the formation of liquid-vapour interfaces which give rise to shrinkage of the swelled pillared structure. Highly porous structures with well developed card-house structures resulted. The pore structure was investigated and compared with that of samples prepared by conventional air-drying procedures. |
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