High Field Conduction of Liquids in Contact with Polymeric Material with Reference to Electrorheological Fluids
The conduction model of electrorheological (ER) effect appears to account qualitatively for the dependence of yield stress on electric field intensity in some ER fluids under DC applied voltage. This model is based on the assumption of the electrical conductivity of the suspending liquid varying exponentially as a function of the square root of the electric field. The field dependence of the liquid conduction in conditions typical of those of working ER fluids is investigated experimentally by examining the conduction properties of a layer of mineral oil lying between sheets of a slightly conducting polymer covering the electrodes. The results presented show that the current in the liquid arises mainly not from the field enhanced dissociation of electrolytic species dissolved in the liquid bulk but from injections of ions occurring at the solid/liquid interfaces.
KeywordsBulk Conduction Metallic Electrode Liquid Conductivity Liquid Thickness Electrorheological Fluid
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