Rheology of a dilute suspension: analytical expression for the viscosity in the limit of low zeta-potentials

A modified theoretical model on the primary electroviscous effect, based up on the inclusion of the condition of that the ions within the Stern layer a re allowed to move tangential to the surface of the particle, is proposed. Booth's analysis (Booth 1950a), valid for spherical particles at low zeta-p otentials, is the start point, and the effect of a dynamic Stern layer is i ncluded. The analytic results are compared with full numerical computations and a good agreement is found for zeta-potentials less than 25 mV.