Aggregation kinetics of OX50 hydrosols in NaCl solutions studied by dynamic light scattering

Abstract

The aggregation kinetics of OX50 sols in aqueous NaCl solutions (10^–4–2 × 10^–1 M) has been studied for 15 days or more by dynamic light scattering. The following set of characteristics has been considered to quantitatively estimate the coagulation intensity in the disperse systems: the particle size corresponding to the maximum in the differential particle size distribution curve, the height of the maximum, the polydispersity index, and the average diameter of the intensity distribution. It has been found that slow sol coagulation proceeds via the barrierless mechanism in secondary potential minimum, which arises from the predominance of the dispersion attractive forces over structural and electrostatic repulsive forces.