Abstract
The slow coagulation of lyophobic sols by electrolytes that may reduce the surface potential by precipitating, chelating or neutralising the adsorbed peptising ion, is described; and the experimental results are explained by an extension of the earlier relations derived from theVerwey-Overbeek theory of stability. Low concentrations of electrolyte—up to ten per cent of the final coagulation value—mainly reduce the stability of dialysed sols by compression of the double layer, while further addition leads to a rapid fall in stability due to reduction of the surface potential. The coagulation of undialysed sols is mainly caused by reduction of surface potential at all concentrations of electrolyte.
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