Abstract
The stability of colloidal silica sols (Ludox HS and Ludox AM) in the presence of various concentrations of NaCl, LiCl, KCl, CsCl, NaBr, NaI, CaCl 2, and Ca(NO 3) 2 has been studied as a function of pH. With increasing pH the stability of the silica sols towards electrolytes markedly decreases except for KCl and CsCl which show a minimum in stability at intermediate pH values. A moving boundary electrophoresis apparatus is described and the mobilities of the Ludox sols as a function of pH and the neutral electrolyte concentration are reported. No correlation was observed between the c.c.c. and the mobilities. Titration curves are given for the exchange of calcium ion for silanolic hydrogen on the sol surface. Ion exchange appears to be the primary reason for the destabilization of silica sols.
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