title: Electroviscous effect of moderately concentrated colloidal suspensions: Stern-layer influence.
abstract: A previous model for the viscosity of moderately concentrated suspensions has been extended. The influence of a dynamic Stern layer (DSL), which produces an additional surface conductance at the electrolyte-particle interface, is included. The theoretical treatment is based on Happel's cell model with Simha's boundary conditions for the interparticle hydrodynamic interactions and on a dynamic Stern-layer model for ionic conduction on the particle surface according to Mangelsdorf and White (ref 39). The results are valid for arbitrary zeta potentials and double-layer thickness. Extensive theoretical predictions are shown and interesting new behaviors are found. The comparison with the results in the absence of additional surface conductance shows a great influence of this mechanism in the energy dissipation during the laminar flow of these suspensions. We conclude that the inclusion of a dynamic Stern layer will be required to match the predictions with the experimental results.
authors.affiliation: Departamento de Física Aplicada I, Universidad de Málaga, Campus de Teatinos, 29071, Málaga, Spain.
authors.forename: Felix
authors.initials: F
authors.lastname: Carrique
authors.forename: Pablo
authors.initials: P
authors.lastname: García-Sánchez
authors.forename: Emilio
authors.initials: E
authors.lastname: Ruiz-Reina