Abstract

BERLI, C. L. A.; DEIBER, J. A.  and  QUEMADA, D.. On the viscosity of concentrated suspensions of charged colloids. Lat. Am. appl. res. [online]. 2005, vol.35, n.1, pp.15-22. ISSN 0327-0793.

This work is concerned with the theoretical estimation of the low-shear viscosity of concentrated suspensions of charged-stabilized latex particles. Calculations are based on the assumption that particles interacting through purely repulsive potentials behave as equivalent hard-spheres (HS), and suspension viscosity may be analyzed in the framework of HS systems. In order to predict numerically the HS radius, the pair potential due to double-layer interaction, as a function of particle concentration, was investigated by using Poisson-Boltzmann theory and the cell model. Calculations explain appropriately experimental data for a wide range of particle sizes, volume fractions and salt concentrations. The problem concerning the effective surface charge of latex particles is also discussed.

Keywords : Suspension Viscosity; Hard-Sphere Radius; Charged Colloids; Double-Layer Interaction.

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