Coagulation Kinetics of Monodispersed Polystyrene Latex Particles by Dynamic Light Scattering Method

摘要

The experimental collision frequency factors of monodispersed polystyrene latex (PSL) particles in KCI solutions were measured by the use of the dynamic light scattering method. This method determines the cluster-size distribution by counting the number of different clusters during the coagulation process and therefore permits the determination of the rough collision frequency factors by the fitting curves for the data. The fitting curves were calculated on the assumption that the coagulation between two same-fold particles is dominant.Numerous studies have revealed significant discrepancies between the theoretical collision frequency factors that can be calculated from Smoluchowski and Fuchs formulation and the experimental results, especially in the slow coagulation region. In this paper's results, good qualitative agreement was found for the theoretical collision factors in the rapid coagulation, but in the slow coagulation, significant discrepancies were confirmed both qualitatively and quantitatively, especially for high-fold particles.