Abstract
An experimental investigation of the electrokinetic phenomenon known as the primary electroviscous effect is described. A characteristic coefficient for the effect has been measured in spherical silica suspensions by means of an automatic method for the determination of the viscosity of liquids using capillary viscometers. The effects of the pH and the KCl concentration are investigated, and the electrophoretic mobilities and zeta potentials of the particles are determined under the different experimental conditions. A comparison between theoretical and experimental values of the electroviscous coefficient demonstrates that the most elaborate models reproduce the trends in variation of the data, although they significantly underestimate the latter. At pH 8 and 9, theory and experiment disagree; this is explained by a hypothesis of silica dissolution.
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