Abstract
The rate of aggregation of monodisperse polystyrene latices in various electrolyte concentrations has been studied. A charge stabilised polystyrene latex dispersion was used and comprised 3.47 μm spheres in water. In perikinetic conditions a finite amount of aggregation of the latex dispersion occurred until a plateau in the single particle number concentration was reached. It was found that a critical flocculation concentration, or at least a narrow range of concentrations existed. Below this region, slow aggregation took place and above, the aggregation was more rapid. Orthokinetic aggregation was studied as a function of shear rate and electrolyte concentration. The initial rate of aggregation increased with increasing electrolyte concentration and shear rate. The aggregation kinetics of the dispersion in prolonged periods of Couette flow at low shear rates was studied. It was shown that the plateau in the single particle number concentration could be altered to higher or lower values depending on the conditions used. The phenomena observed were explained in terms of the secondary minimum flocculation.
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