The primary electroviscous effect in ageing AgI sols: Effect of increasing concentrations of counter ions of different valencies
TL;DR: In this article, the electroviscous effect in negatively charged AgI sol has been measured in presence of uni-, bi-, and trivalent cations at different concentrations, for a constant low volume fraction of the suspended solid particles.
About: This article is published in Journal of Electroanalytical Chemistry.The article was published on 1982-01-25. It has received 2 citations till now. The article focuses on the topics: Counterion & Electrolyte.
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01 Sep 1986
TL;DR: In this paper, the primary electroviscous effect and ζ potentials in two different series of polystyrene lattices of increasing particle size, prepared without addition of surfactants, have been measured, in the presence of increasing concentrations of quaternary ammonium counterions of different ionic sizes.
Abstract: The primary electroviscous effect and ζ potentials in two different series of polystyrene lattices of increasing particle size, prepared without addition of surfactants, have been measured, in the presence of increasing concentrations of quaternary ammonium counterions of different ionic sizes It has been found that whereas for the larger particle size lattices the measured electrical contribution to the primary electroviscous effect ( η el / η 0 φ ) = ( η − η 0 )/ η 0 φ − 25) decreases with increasing counterion concentration, as required by the theory, it either remains more or less constant or increases slowly in the case of smaller particle size lattices due possibly to the simultaneous occurrence of a slow feeble agglomeration of the latex particles in the presence of increasing counterion concentrations Stability calculations according to the DLVO theory tend to support this conjecture The electrophoretically measured ζ potentials show a steady decrease with increasing counterion concentration; a Langmuir-type isotherm relating the decrease of charge density in the Stem plane with the added counterion concentration has been found to be mostly able to account for the observed results
7 citations
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TL;DR: In this paper, the contribution of electroviscous effects to the viscosity of monodisperse polystyrene latices has been studied and the validity of the Einstein equation was demonstrated for perfectly stable latices.
101 citations
88 citations
TL;DR: In this paper, a theoretical explanation of the electroviscous effect at high concentrations is given, based upon the repulsive forces between particles passing each other in the laminar flow.
39 citations
24 citations