Separation-independent attractive force between like particles mediated by nematic-liquid-crystal distortions
Separation-independent attractive force between like particles mediated by nematic-liquid-crystal distortions
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DOI：
10.1103/physrevlett.94.148301
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发表时间：
2005-04-15
影响因子：
8.6
通讯作者：
Yokoyama, H
中科院分区：
文献类型：
--
作者：
Fukuda, J;Yokoyama, H
本文利用Landau-de Gennes连续介质理论，数值研究了向列液晶弹性畸变介导的两个携带相同拓扑电荷+1的球形粒子之间的相互作用。我们考虑在粒子之间存在逃逸的非拓扑环偏差的情况；厂长处处连续，无反缺陷。我们发现相互作用是吸引的，其势能与粒子间距离d呈线性关系。这种行为产生了与d无关的相互作用力，这是由Poulin， Cabuil和Weitz[物理学家]在实验中观察到的。在粒子之间存在双折射区域的窄弦（“泡泡糖”结构）。
We investigate numerically with the aid of the Landau-de Gennes continuum theory the interaction between two spherical particles carrying the same topological charges +1 mediated by the elastic distortion of a nematic liquid crystal. We consider the case where an escaped nontopological ring disclination is situated between the particles; the director is continuous everywhere and no counterdefects are present. We find that the interaction is attractive and its potential energy depends linearly on the interparticle distance D. This behavior yields the D-independent interaction force, which was observed experimentally by Poulin, Cabuil, and Weitz [Phys. Rev. Lett. 79, 4862 (1997)] in the presence of narrow strings of birefringent regions ("bubble-gum" configuration) between the particles.