Syunthesis of Silica Aerogel at Ambient Pressure and Characterization (I)

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J. Korean Ceram. Soc. > Volume 33(12); 1996 > Article

Journal of the Korean Ceramic Society 1996;33(12): 1394.

실리카에어로겔의 상압합성 및 특성연구(I)

강신규, 최세영

연세대학교 세라믹공학과

Syunthesis of Silica Aerogel at Ambient Pressure and Characterization (I)

ABSTRACT

The Silica gel with the density of 0.2g/cm3 and porosity of 90% was synthesized. The silica wet gel was dried and heat-treated under the ambient pressure after modification of the wet gel surface by TMCS. Specific surface area total pore volume and mean pore radius of dried gel were all increased with increasing heat treatment temperature and confirmed about 1400m2/g, 4.5cc/g and 8 nm respectively after heat treatment above 25$0^{circ}C$. But the pore size distribution of dried gel was in the range of 1-100nm and was almost indepen-dent of temperature. As the result of external shape pore characteristics and microstructure of gel using SEM similar properties were observed between the silica gel synthesized in this study and the silica aerogel through the super critical drying.

Key words: Silica gel, Modification, TMCS, Ambient pressure, Silica aerogel, Super critical drying