Vortexlike topological defects in nematic colloids: chiral colloidal dimers and 2D crystals.
Vortexlike topological defects in nematic colloids: chiral colloidal dimers and 2D crystals.
复制标题
向列胶体中的涡旋拓扑缺陷：手性胶体二聚体和二维晶体。
DOI：
10.1103/physrevlett.103.127801
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发表时间：
2009
影响因子：
8.6
通讯作者：
I. Muševič
中科院分区：
文献类型：
--
作者：
U. Tkalec;M. Ravnik;S. Žumer;I. Muševič
我们发现，手性订购的基础复杂的流体强烈影响缺陷的形成和胶体相互作用。观察到拓扑荷为-2的非奇异缺陷环，其截面与磁系统中的双曲涡旋相同。这些环结合自发形成的成对的胶体颗粒和二聚体，它们是手性物体。手性二聚体-二聚体相互作用弱依赖于二聚体的手性，并导致组装的纯或“混合”手性的二维双折射胶体晶体，插入与晶格的非奇异的旋涡状缺陷。
We show that chiral ordering of the underlying complex fluid strongly influences defect formation and colloidal interactions. Nonsingular defect loops with a topological charge -2 are observed, with a cross section identical to hyperbolic vortices in magnetic systems. These loops are binding spontaneously formed pairs of colloidal particles and dimers, which are chiral objects. Chiral dimer-dimer interaction weakly depends on the chirality of dimers and leads to the assembly of 2D nematic colloidal crystals of pure or "mixed" chirality, intercalated with a lattice of nonsingular vortexlike defects.