The structural evolution of alkoxy-derived gel during drying |
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Authors: | Atsuo Yasumori Hiroshi Kawazoe Masayuki Yamane |
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Affiliation: | Department of Inorganic Materials, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152, Japan |
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Abstract: | The effects of drying temperature on the structural evolution of alkoxy-derived silica gel prepared using various catalysts have been investigated. The dependence of specific surface area, Sg, reflecting the structure, on the temperature of drying was remarkable for a non-catalyzed xerogel. The effect of drying temperature on the Sg of an ammonia-catalyzed xerogel was also found but was not very large. The Sg of xerogels obtained by drying at 60°C was always higher by 50% than the gels dried at 30°C without regard to the aging temperature. The Sg of xerogels from HCl-catalyzed solution was of the order of several m2/g, however, the Sg of the aerogel obtained by hypercritical drying of the wet gel from a similar solution was about 800 m2/g. These phenomena were understood on the basis of SAXS measurements on both wet gels and aerogels. |
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