Preparation of SiO2 Aerogel Derived from TEOS Catalyzed by HF

Abstract

Abstract: Nano-porous material SiO₂ aerogels were prepared from TEOS/C₂H₅OH and catalyzed by HF. The effects of some variable parameters such as catalyst ，
pH，water and solvent on the sol-gel process were studied. The results showed that catalyst HF greatly influences the velocity of
the hydrolysis and condensation of the TEOS. The special effect of the HF catalyst on the sol-gel process was also discussed. BET and TEM showed that the silica aerogels have a high inner surface
area (673.8m²g^-1) and the diameter of the skeletal particles is about 5-10 nm while the pore size is about 5--30 nm.

Key words: HF，SiO₂ aerogel，sol-gel，super critical drying

CLC Number:

O648
TM285

DENG Zhong-Sheng,WANG Jue,SHEN Jun,ZHOU Bin,WEI Jian-Dong,CHEN Ling-Yan. Preparation of SiO₂ Aerogel Derived from TEOS Catalyzed by HF[J]. Journal of Inorganic Materials.

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Preparation of SiO₂ Aerogel Derived from TEOS Catalyzed by HF

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