Study of Viscosity and Stability of SiO2 Sol Prepared by Sol-Gel Method

Kun Peng; Ming Yue Yuanyin; Jia Jun Zhu; De Yi Li; Ling Ping Zhou

doi:10.4028/www.scientific.net/AMR.834-836.454

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Study of Viscosity and Stability of SiO₂ Sol Prepared by Sol-Gel Method

Abstract:

Silica sol was prepared using TEOS as the precursor and HCl as the catalyst by sol-gel process. The effects of the ratio of the reactants and temperature on the viscosity of SiO₂ sol during the sol-gel processing were investigated and the reaction activated energy was calculated. With the increase of the EtoH/TEOS ration, the viscosity reduced, a higher viscosity can be obtained at the H₂O/TEOS ratio of about 8. The viscosity increased and the gel time decreased with the increase of temperature, the activation energy of the formation of gel was about 73.8kJ/mol.