The Conductivity Confined Temperature Dependence of Water-Free Electrorheological Fluids

The Interfacial Polarization-Induced Electrorheological Effect

“…Two suspensions with quite different conductive particles should display different temperature dependencies. We found that the shear stress of the oxidized polyacrylonitrile/silicone oil suspension decreases with increasing temperature if the dispersed particle conductivity is around 10 Ϫ9 S/m; however, it increases with increasing temperature if the dispersed particle conductivity is around 10 Ϫ11 S/m (14). A detailed analysis is available in Ref.…”

“…However, the currently observed phenomena are not well understood using these models. For example, some materials have a comparatively large dielectric constant but do not display any ER effect (9, 10); the particle dielectric loss tangent around 0.10 at 1000 Hz is an essential requirement for a high performance ER fluid (9,10); the fluid with high conductive particles usually has a short response time (11); the strongest ER effect takes place in the suspension with the particle conductivity around 10 Ϫ7 S/m (12); and a high frequency electric field or a high temperature can improve the ER effect of some materials markedly (13,14), while weakening the ER effect of other materials dramatically (14 -16). In this paper, we try to systematically understand these ER phenomena using the Wagner model (17)(18)(19).…”

“…Filisko (21) speculates that the temperature dependence of dry aluminosilicate-based ER fluid is associated with the interfacial polarization dispersion. We use the Wagner model to understand temperature dependence of the ER effect (14), successfully explaining why some material displays a clear ER effect at high temperature and others are active at low temperature. We believe that the Wagner model can help us better understand all observed ER phenomena.…”

Electrorheological properties of PMMA-b-PSt copolymer suspensions

“…Most of the studies on the literature are focused on the ER activity of acrylate salts and zeolitic materials, and very few of these researchers have investigated the influence of colloidal stability of suspensions. Another target is, for ER fluids, with long service stabilities, particularly at high temperatures and rigid environmental conditions [14].…”

Effects of Conductivity and Dielectric Behaviors on the Electrorheological Response of a Semiconductive Poly(p-phenylene) Suspension

“…The product, dried at 110ЊC for 10 dielectric behaviors on ER properties were experimentally h, was a finely divided, light brown powder. studied by Hao and co-workers (5,6), suggesting that a…”