巨电流变效应及其机理

文章介绍了一种全新的电流变材料，即一种具有巨电流变(giant electro-rheological，简称GER)效应的纳米颗粒电流变液．之所以称之为“巨”，是因为此类材料的电流变效应远远突破了通常理论所预测到的“上限”，其剪切强度超过100kPa．同时文章作者还发现，此类电流变效应与外加电场呈线性变化关系，而非通常的二次方关系．用所提出的“表面极化饱和”模型圆满地解释了GER效应的实验结果．

The giant electrorheological effect and its mechanism

The giant electrorheological effect 1] (GER) has been observed in a novel type of electrorheological suspension of coated nanoparticles that exhibits electrically controllable liquid-solid transitions in which the solid state can reach a yield strength more than 100 kPa, breaking the theoretical upper bound predicted by conventionally theoretical assumptions. This GER effect displays near-linear variation of the static yield stress versus the electric field, in contrast to the quadratic variation usually observed. A theoretical model, based on saturation surface polarization in the contact region of neighboring particles, yields predictions in excellent agreement with the experiment.