A two-step silica sol-gel process investigated with static and dynamic light-scattering measurements

The hydrolysis-condensation reactions in mixtures of tetraethoxysilane, ethanol and water were followed in the basic step of a two-step silica sol-gel process with dynamic and static light-scattering techniques. The radii of the particles formed were found to be about 1.5 nm and in agreement with th...

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Bibliographic Details
Published in:Journal of non-crystalline solids 1989, Vol.109 (2), p.153-163
Main Authors: Boonstra, A.H., Meeuwsen, T.P.M., Baken, J.M.E., Aben, G.V.A.
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Chemical industry and chemicals
Exact sciences and technology
Glasses
Manufacture
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Summary:The hydrolysis-condensation reactions in mixtures of tetraethoxysilane, ethanol and water were followed in the basic step of a two-step silica sol-gel process with dynamic and static light-scattering techniques. The radii of the particles formed were found to be about 1.5 nm and in agreement with the results found with specific surface area measurements on the corresponding dried silica gels. The relatively high scattering found for mixtures having incomplete hydrolysis in the acid step was ascribed to the formation of large particles caused by prolonged hydrolysis-condensation in the basic step. The decreased light transmission as a function of the decreasing density of dried silica gels was assigned to Rayleigh scattering by pores.
ISSN:0022-3093
1873-4812
DOI:10.1016/0022-3093(89)90027-6