The kinetic study of aggregation of the sulphide Cu0.2Zn0.8S particles by gravitational field-flow fractionation

Gravitational Field-Flow Fractionation (GFFF) is a subtechnique of FFF whic h combines the earth gravitational force with the carrier liquid flow in a horizontal, ribbon-like channel which is well suited for the separation and characterization of monodisperse or polydisperse colloidal materials and m acromolecules. In the present work the interaction between the polydisperse Cu0.2Zn0.8S su lphide particles which leads to their aggregation is studied with the aid o f the GFFF technique. From the variation of the number, average diameter of the particles with the time, rate constants for the bimolecular process of aggregation for the sulphide Cu0.2Zn0.8S, particles were determined and us eful conclusions concerning the aggregation mechanism were extracted.