热力学驱动的拓扑缺陷演化引导之字形焦点圆锥域的生成和正则化

IF 5.4 1区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY GIANT Pub Date : 2024-07-16 DOI:10.1016/j.giant.2024.100327
Daoxing Luo , Jinbing Wu , Zhenghao Guo , Jingmin Xia , Wei Hu
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引用次数: 0

摘要

液晶作为典型的各向异性构件,往往会在不同的热力学过程中自组装成各种有序结构。对其基本机制和规则的研究可能会极大地促进我们对复杂结构的理解。在这里,"之 "字形焦点圆锥域(ZFCD)是在拮抗边界条件下的快速冷却过程中产生的。在向列-共晶(N-S)相变点下经过数次热循环后,ZFCD 得到了很好的规整。我们发现,与快速冷却相关的位错在 ZFCD 的形成过程中起着至关重要的作用。在N-S相变点上方,我们观察到人字形±1/2位错对和ZFCD之间存在很强的相间相关性。整个相变过程中的定向顺序继承性和拓扑不变性表明,ZFCDs 中也存在类似的披露对。这些分离对促进了相邻焦点圆锥畴(FCD)之间的相反倾斜方向和半间距横向移动,从而形成了 ZFCD。在热循环过程中,分子的热运动促使缺陷核心规整化和消除,从而进一步形成有序的 ZFCD。通过适当控制冷却速率,在热循环后的较宽薄膜厚度范围内实现了大面积有序 ZFCD。这项研究丰富了人们对液晶拓扑缺陷导向结构的认识,并可能为有序自组装系统的生成和规整化铺平道路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Generation and regularization of zigzag focal conic domains guided by thermodynamic-driven topological defect evolution

Liquid crystals, as typical anisotropic building blocks, tend to self-assemble into various ordered architectures during distinct thermodynamic processes. Research on the underlying mechanisms and rules may drastically promote our understanding of complicated structures. Here, zigzag focal conic domains (ZFCDs) are generated in rapid cooling process under an antagonistic boundary condition. After several thermal cycles beneath the nematic-smectic (N-S) phase transition point, the ZFCDs are well regularized. We found that the dislocations associated with the rapid cooling play vital roles in the formation of ZFCDs. A strong interphase correlation between the zigzag ± 1/2 disclination pairs and ZFCDs is observed above the N-S phase transition point. The orientational order inheritance and topological invariance across the phase transition indicate that similar disclination pairs exist in ZFCDs. These disclination pairs facilitate the opposite tilt direction and a half-pitch lateral shift between neighboring focal conic domains (FCDs), thus forming ZFCDs. During thermal cycles, the thermal motion of molecules induces the regularization and elimination of defect cores, further resulting in the ordered ZFCDs. Via properly controlling the cooling rate, large-area ordered ZFCDs are achieved in a wide film thickness range after thermal cycles. This study enriches the knowledge on the topological defect guided architecture of liquid crystals and may pave the way for the generation and regularization of ordered self-assembled systems.

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来源期刊
GIANT
GIANT Multiple-
CiteScore
8.50
自引率
8.60%
发文量
46
审稿时长
42 days
期刊介绍: Giant is an interdisciplinary title focusing on fundamental and applied macromolecular science spanning all chemistry, physics, biology, and materials aspects of the field in the broadest sense. Key areas covered include macromolecular chemistry, supramolecular assembly, multiscale and multifunctional materials, organic-inorganic hybrid materials, biophysics, biomimetics and surface science. Core topics range from developments in synthesis, characterisation and assembly towards creating uniformly sized precision macromolecules with tailored properties, to the design and assembly of nanostructured materials in multiple dimensions, and further to the study of smart or living designer materials with tuneable multiscale properties.
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