Abstract
Electrophoretic light scattering is shown to detect the heterocoagulation-stability transition, induced by a variation of pH, in a model binary colloidal (silica-silica/aminopropyl) system. For stable mixtures of silica, bimodal zeta-potential distributions have been obtained with peak positions corresponding to those of monomodal zeta-potential distributions due to the separate silicas, while for heterocoagulated mixtures, only monomodal distributions appeared with peak positions between those of separate silicas. The isoelectric point was found at pH 3.7 and 6.25 for silica and silica/aminopropyl respectively, and the heterocoagulation-stability transition was predicted at pH 6.6. This is in accordance with the DLVO theory.
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