Kumar Anil, Khusid Boris, Qiu Zhiyong, Acrivos Andreas
The Levich Institute, The City College of New York, 140th Street & Convent Avenue, New York, New York 10031, USA.
Phys Rev Lett. 2005 Dec 16;95(25):258301. doi: 10.1103/PhysRevLett.95.258301. Epub 2005 Dec 15.
We report the discovery of a new class of an electric field-driven bulk phase transition due solely to dipolar interactions in a suspension under the action of a uniform ac field where the effects of other competing forces are suppressed. This transition appears after the well-known chain-column formation and causes the uniform suspension of columns to rearrange into a cellular pattern consisting of particle-free domains surrounded by particle-rich walls. Interestingly, the characteristic size of these domains scales linearly with the interelectrode spacing and remains insensitive to the size of the particles.
我们报告了在均匀交流电场作用下，悬浮液中仅由于偶极相互作用而发现的一类新的电场驱动体相转变，其中其他竞争作用力的影响被抑制。这种转变在著名的链-柱形成之后出现，并导致柱状物的均匀悬浮液重新排列成一种蜂窝状图案，该图案由富含颗粒的壁包围的无颗粒区域组成。有趣的是，这些区域的特征尺寸与电极间距呈线性比例关系，并且对颗粒大小不敏感。
