The primary electroviscous effect: Measurements on silica sols

The dependence of the viscosity of silica (ludox) sols on the electrolyte concentration of various aqueous solutions has been determined. At volume fractions below 5% the sols were Newtonian and the viscosity was proportional to the volume fraction of the particles. The (large) deviations from the E...

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Bibliographic Details
Published in:Journal of colloid and interface science 1990, Vol.134 (1), p.169-173
Main Authors: Honig, E.P, Pünt, W.F.J, Offermans, P.H.G
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Physical and chemical studies. Granulometry. Electrokinetic phenomena
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Summary:The dependence of the viscosity of silica (ludox) sols on the electrolyte concentration of various aqueous solutions has been determined. At volume fractions below 5% the sols were Newtonian and the viscosity was proportional to the volume fraction of the particles. The (large) deviations from the Einstein equations can be explained very well with the effective increase of the particle volume due to the electrical double layer, as described by the Booth equation for the primary electroviscous effect.
ISSN:0021-9797
1095-7103
DOI:10.1016/0021-9797(90)90263-N