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Synthesis and Properties of Silica Aerogel by Using Acid Silica Sol and TEOS as Silicon Sources

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Abstract:

Silica aerogels were synthesized from hybrid silicon sources of TEOS and acid silica sol by two-step sol-gel method and supercritical drying. Different chemical compositions of the starting solution were altered in order to make an insight into the relationship between process parameters and the microstructural characteristics of resulting silica aerogels. The results indicate that a certain amount of acid silica sol may promote the gelation process while excessive nano-scaled silica particles easily result in dense structure and low specific surface area. The gelation time increases with the increasing water amount. Excessive water will lead to weak network structure of silica gels and thus larger shrinkage and lower porosity of the resulting silica aerogels.

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Periodical:

Key Engineering Materials (Volumes 336-338)

Pages:

1509-1512

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.336-338.1509

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Online since:

April 2007

Authors:

Fang He, Hai Lei Zhao, Xian Hui Qu, Wei Hua Qiu, Wei Jiang Wu

Keywords:

Hybrid Sols, Silica Aerogel, Sol-Gel (SG), Supercritical Drying

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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