Preparation of Silica Aerogels by Supereritical Drying Technique

Chem. J. Chinese Universities ›› 1995, Vol. 16 ›› Issue (6): 840.

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Preparation of Silica Aerogels by Supereritical Drying Technique

CHEN Long-Wu¹, GAN Li-Hua¹, YUE Tian-Yi¹, LI Guang-Ming¹, WANG Jue², SHEN Jun²

1. Department of Chemistry Tongji University, Shanghai 200092;
2. Department of Physics Tongji University, Shanghai 200092

Received:1994-09-27 Revised:1995-01-02 Online:1995-06-24 Published:1995-06-24

Abstract

Abstract: Silica aerogels were prepared by sol-gel process and supercritical drying technique.The effects of the pHvalue of solution on the gelation time and the density of the aerogel samples were studied.Through XRD, SAXS,TEM and some other experimental methods,the structure of silica aerogel samples was primarily investigated. The results show that the silica aerogels were coherent,non-crystalline,nanosized porous solids.The mean diameter of particles is about l0 nm.

Key words: Aerogel, Supercritical drying technique, Sol-gel method, Nano-particle non-crystalline solide

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CHEN Long-Wu, GAN Li-Hua, YUE Tian-Yi, LI Guang-Ming, WANG Jue, SHEN Jun. Preparation of Silica Aerogels by Supereritical Drying Technique[J]. Chem. J. Chinese Universities, 1995, 16(6): 840.

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Preparation of Silica Aerogels by Supereritical Drying Technique

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