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arXiv 1607.08263cond-mat.soft
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手征向列壳的介观结构

Mesoscale Structure of Chiral Nematic Shells

Ye Zhou, Ashley Guo, Rui Zhang, Julio C. Armas-Perez, Jose A. Martinez-Gonzalez, Mohammad Rahimi, Monirosadat Sadati, Juan J. de Pablo

摘要:

对液晶中拓扑缺陷的理解和控制一直是人们关注的焦点。在这方面,液滴形式的限制特别有效。在这里,我们采用Landau-de Gennes方法来探讨壳几何中的几何挫折,并专注于手性材料。通过改变均匀壳层的手性和厚度,我们构建了一个包含四价结构、双极结构(BS)、弯曲结构和径向球形结构(RSS)的相图。结果发现,在均匀的壳,BS到RSS结构的转变,在响应于两个手性和壳的几何形状,伴随着突变的缺陷位置,这意味着潜在的使用手性的双壳传感器。此外,我们研究了壳层的厚度不均匀性,并证明了非手性和手性双壳层表现出不同的平衡位置,其内核由壳层手性c。

英文摘要:

There is considerable interest in understanding and controlling topological defects in nematic liquid crystals (LCs). Confinement, in the form of droplets, has been particularly effective in that regard. Here, we employ the Landau-de Gennes method to explore the geometrical frustration of nematic order in shell geometries, and focus on chiral materials. By varying the chirality and thickness in uniform shells, we construct a phase diagram that includes tetravalent structures, bipolar structures (BS), bent structures and radial spherical structures (RSS). It is found that, in uniform shells, the BS-to-RSS structural transition, in response to both chirality and shell geometry, is accompanied by an abrupt change of defect positions, implying a potential use for chiral nematic shells as sensors. Moreover, we investigate thickness heterogeneity in shells and demonstrate that non-chiral and chiral nematic shells exhibit distinct equilibrium positions of their inner core that are governed by shell chirality c.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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