Time-dependent dielectric response of quiescent electrorheological fluids

摘要: The evolution of structure in a quiescent electrorheological fluid was monitored by following the increase static permittivity after an electric field applied. zero-time agreed well with theoretical predictions for randomly dispersed colloidal suspension. As time progressed, increased as anisotropic evolved, and rate at early times depended on square applied field. For low particle loadings high fields, measured long dense columnar aggregates. Under lower fields or more concentrated suspensions, however, intermediate coarsening process quenched, corresponding final less compact, resulting than predicted. 11 refs., 12 figs.