On the Differentiation of Heterocoagulation and Coagulation Processes Processing in Binary Mixed Sol

Abstract

Results of turbidimetry study of aggregate stability of binary SiO 2 -ZrО 2 sol and its components in 10 -3 -10 -1 M KCl solutions at рН 3.4 when ZrO 2 particles have a high positive charge and SiO 2 particles are slightly (close to zero) negatively charged are presented. The ratio of numerical concentrations of sol particles ZrO 2 to SiO 2 was 7.8 : 1. It was found that in binary SiO 2 -ZrО 2 sol both the process of heterocoagulation (mutual coagulation) of sols and coagulation of the same oxide particles occur throughout the studied range of KCl concentrations. The way of differentiation of processes of dissimilar SiO 2 and ZrO 2 particles heterocoagulation and coagulation of components is proposed. It is shown that at pH 3.4 the increase in the concentration of KCl solutions in binary SiO 2 -ZrО 2 sol leads to a decrease in the intensity of the process of ZrO 2 and SiO 2 particles mutual coagulation, which is explained by the decrease in the radius of action of attraction of dissimilar particles.