The base-catalyzed hydrolysis and condensation reactions of dilute and concentrated TEOS solutions

The synthesis of submicron silica particles by the hydrolysis and condensation of dilute and concentrated solutions of tetraethylorthosilicate (TEOS) has been studied in low molecular weight alcohols (C 1–C 4). A base (ammonia) was used to catalyze the reaction. Raman spectroscopy, gas chromatograph...

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Bibliographic Details
Published in:Journal of non-crystalline solids 1990-05, Vol.121 (1), p.397-403
Main Authors: Harris, Michael T., Brunson, Ronald R., Byers, Charles H.
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Emulsions. Microemulsions. Foams
Exact sciences and technology
General and physical chemistry
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Summary:The synthesis of submicron silica particles by the hydrolysis and condensation of dilute and concentrated solutions of tetraethylorthosilicate (TEOS) has been studied in low molecular weight alcohols (C 1–C 4). A base (ammonia) was used to catalyze the reaction. Raman spectroscopy, gas chromatography and the molybdate method were used to establish the hydrolysis and condensation kinetics. Dynamic and classical light-scattering techniques were employed to monitor particle growth and particle number concentration kinetics, and particle size distribution. The effects of solvent and TEOS concentration on the degree of monodispersity of the particles are discussed. Further, the chemical and particle growth data were used to test theories of homogeneous nucleation and aggregative growth, which have been proposed as mechanisms that govern the growth of submicron monodisperse silica particles by TEOS hydrolysis.
ISSN:0022-3093
1873-4812
DOI:10.1016/0022-3093(90)90165-I