Abstract
AbstractAn experimental investigation of the electrokinetic phenomena known as primary electroviscous effect with suspensions of polystyrene spheres is described. A characteristic coefficient of the effect has been measured by an automatic method for the determination of the viscosity of liquids through capillary viscometers. In order to compare this coefficient with the values predicted by different theoretical models, the electrophoretic mobility of the spheres was measured by means of a microelectrophoresis apparatus. The zeta potential was calculated from the results with a complete theory of the electrophoresis of spherical particles. The comparison between theoretical and experimental values of the electroviscous effect shows that the theories of Booth and of Watterson and White reproduce very well the general trend of the experimental results, althogh they seem to underestimate the latter.
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