Abstract
The effect of fluoride on the polymerization of silicic acid was studied in the pH range 2.5–0. The polymerization of silicic acid was accelerated by fluoride. The rate of reaction between monosilicic acids was most rapid at an F/Si atomic ratio of about 0 5. In silicic acid solutions containing fluoride up to an F/Si atomic ratio of 2 0 the growth rate of polysilicic acid particles increased with increasing fluoride concentration and was most rapid at about pH 1. It Is suggested that the growth of polysilicic acid particles is due mainly to the reaction between monosilicic and polysilicic acids, because the reaction between polyslllclc acids is relatively slow.
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