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arXiv 1402.3728cond-mat.soft
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手性近晶A相膜:自由边结构和扭曲壁的统一理论

Chiral smectic A membranes: Unified theory of free edge structure and twist walls

C. Nadir Kaplan, Robert B. Meyer

摘要:

棒状手性$fd$病毒的单分散悬浮液通过耗尽力凝聚成棒状排列的厚胶体单层。分子的扭曲变形被驱逐到单层边缘,如在手性近晶$A$液晶中,并且在边缘处形成窄带。两个这样的隔离膜的聚结导致夹在两个对齐的杆区域之间的扭曲壁,称为$π$ -壁。通过建模的膜作为一个二元流体共存的手性和近晶$A$液晶区域,我们开发了一个统一的理论的$π$ -壁和单层边缘。我们的模型的平均场分析产生的分子倾斜分布,局部厚度的变化,和交叉从近晶到近晶的行为在单层边缘和整个$π$壁。此外,我们计算了与这些接口的形成相关联的线张力。我们的模型提供了有关的稳定性和详细的结构的$π$壁和单层边缘的见解。

英文摘要:

Monodisperse suspensions of rodlike chiral $fd$ viruses are condensed into a rod-length thick colloidal monolayers of aligned rods by depletion forces. Twist deformations of the molecules are expelled to the monolayer edge as in a chiral smectic $A$ liquid crystal, and a cholesteric band forms at the edge. Coalescence of two such isolated membranes results in a twist wall sandwiched between two regions of aligned rods, dubbed $π$-walls. By modeling the membrane as a binary fluid of coexisting cholesteric and chiral smectic $A$ liquid-crystalline regions, we develop a unified theory of the $π$-walls and the monolayer edge. The mean-field analysis of our model yields the molecular tilt profiles, the local thickness change, and the crossover from smectic to cholesteric behavior at the monolayer edge and across the $π$-wall. Furthermore, we calculate the line tension associated with the formation of these interfaces. Our model offers insights regarding the stability and the detailed structure of the $π$-wall and the monolayer edge.

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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