which is reflected in the variation of the electric (dielectric The shear stresses and the current densities of four sorts of and conductive) properties of ER fluids with temperature. water-free ER fluids, two oxidized polyacrylonitriles-based and Another is the particles' thermal motion, which would be two aluminosilicates-based, were investigated at elevated and reintensified by increased temperature. The ER effect is specuduced temperatures in order to elucidate the operating mechalated to drop at high temperature as the particles' thermal nism. The complicated relationships among the mechanical propmotion would compete with the particles' fibrillation. How erties, the current density, and temperature were especially adtemperature influences the ER response would mostly rely dressed. The Wagner model was introduced to interpret our on, we think, which of these two factors is dominant under observations, instead of the commonly used conductivity model.
the experimental conditions. Of course, the temperature-de-It is found that the conductivity of the dispersed particles determines the temperature dependence of the shear stress and the pendent properties of the dispersing medium also can modify current density of an ER fluid. Our findings have direct implication the ER effect on a considerable scale, but in most cases, for the design of industrially required ER fluids and would be it is negligible compared with the two factors mentioned significant for ER applications.