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arXiv 1707.09015cond-mat.soft
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胶体自组装和输运现象的线虫流体动力学

Nematohydrodynamics for Colloidal Self-Assembly and Transport Phenomena

Sourav Mondal, Apala Majumdar, Ian M. Griffiths

摘要:

我们研究了向列型液晶填充的微流体通道中的胶体颗粒,并展示了颗粒和通道壁之间的弹性相互作用如何导致与传统微流体相比不同的颗粒动力学。对于静态颗粒,在不存在流场的情况下,颗粒表面上的指向矢取向经历从均匀到垂面锚定的快速转变,作为锚定强度和颗粒尺寸的函数。在存在流场的情况下,除了颗粒上的流体粘性应力之外,由于锚定条件而施加向列相诱导的弹性应力。所产生的力被示出提供基于尺寸的分离单个颗粒的可能性。对于多粒子系统,粒子间相互吸引力引起粒子间相互吸引力,粒子聚集并重新定向。这些结果说明了如何耦合向列流体动力学效应可以影响流动性和空间重组的胶体颗粒在微流体应用。

英文摘要:

We study colloidal particles in a nematic-liquid-crystal-filled microfluidic channel and show how elastic interactions between the particle and the channel wall lead to different particle dynamics compared with conventional microfluidics. For a static particle, in the absence of a flow field, the director orientation on the particle surface undergoes a rapid transition from uniform to homeotropic anchoring as a function of the anchoring strength and the particle size. In the presence of a flow field, in addition to fluid viscous stresses on the particle, nematic-induced elastic stresses are exerted as a result of the anchoring conditions. The resulting forces are shown to offer the possibility of size-based separation of individual particles. For multi-particle systems, the nematic forces induce inter-particle attraction induces particle attraction, following which the particles aggregate and reorientate. These results illustrate how coupled nematic-hydrodynamic effects can affect the mobility and spatial reorganization of colloidal particles in microfluidic applications.

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