Abstract
Hydrolysis and condensation of tetraethylorthosilicate (TEOS) were measured under various pH ranges. Differential temperature analysis was used to determine the hydrolysis rate constant and the activation energy of hydrolysis. A kinetic model was established on the basis of hydrolysis, esterification and water-alcohol forming condensation. Each reaction rate constant could be obtained from gas chromatography analysis and the kinetic model. Hydrolysis rate constants were in proportion to acid concentration. Also the esterification reaction should not be neglected during the sol-gel transition of TEOS in alcoholic solvent.
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