School of Physics and Astronomy, University of Minnesota, 116 Church St. SE, Minneapolis, MN 55455, USA.
Soft Matter. 2018 Jun 6;14(22):4641-4648. doi: 10.1039/c7sm02492d.
We develop a formal analogy between configurational stresses in physically distinct systems, and study the flows that they induce when the configurations of interest include topological defects. Our primary focus is on electrokinetic flows in a nematic fluid under an applied electrostatic field, which we compare with a class of systems in which internal stresses are generated due to configurational changes (e.g., active matter, liquid crystal elastomers). The mapping allows the extension, within certain limits, of existing results on transport in electrokinetic systems to active transport. We study motion induced by a pair of point defects in a dipole configuration, and steady rotating flows due to a swirling vortex nematic director pattern. The connection presented allows the design of electrokinetic experiments that correspond to particular active matter configurations that may be easier to conduct and control in the laboratory.
我们在物理上不同的系统之间建立了构形应力的形式类比，并研究了当感兴趣的构形包括拓扑缺陷时它们所诱导的流动。我们的主要关注点是在外部电场作用下的向列相流体中的电动流动，我们将其与一类由于构形变化而产生内部应力的系统（例如，活性物质、液晶弹性体）进行比较。该映射允许在一定限制内将电动系统中传输的现有结果扩展到主动传输。我们研究了在偶极子构型中一对点缺陷引起的运动，以及由于漩涡向列型指向矢图案引起的稳定旋转流动。所提出的连接允许设计与特定活性物质构型对应的电动实验，这些构型在实验室中可能更容易进行和控制。
