Alternating defects and egg and dart textures in de-wetted stripes of discotic liquid crystal
Alternating defects and egg and dart textures in de-wetted stripes of discotic liquid crystal
复制标题
盘状液晶去湿条纹中的交替缺陷以及蛋形和飞镖纹理
DOI：
10.1080/02678292.2021.1983048
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发表时间：
2021
期刊：
影响因子：
2.2
通讯作者：
R. Bushby
中科院分区：
文献类型：
--
作者：
J. P. Bramble;Daniel J. Tate;S. Evans;J. Lydon;R. Bushby
离散液晶在具有约5-10 μm宽的润湿和去润湿条纹的图案化表面上的各向同性相去润湿导致长窄液滴的形成。在缓慢冷却到柱状相时，液晶排列成使得柱横跨或沿着条纹。然而，如果条带较宽和/或冷却速率太快，则会出现缺陷。当有许多这样的缺陷时，结果是复杂的锯齿和波浪线光学纹理，这让人想起与古典建筑相关的蛋和飞镖中楣。在第一个近似值中，所有这些图案都可以被看作是可展域的连接片段，其中柱要么环绕缺陷，要么以直线传播。它们是由涉及弯曲但不涉及展曲或扭曲变形的图案构成的;这种变形使柱状相的二维晶格保持不变。如图所示，这些基本的圆形和直线图案可以沿着条纹以各种不同的方式沿着组合，但是在所有这些中，发现缺陷从一侧到另一侧交替。图形摘要
ABSTRACT Isotropic phase de-wetting of discotic liquid crystals on a surface patterned with alternating ~5-10 μm wide wetting and de-wetting stripes results in the formation of long narrow droplets. On slow cooling into the columnar phase, the liquid crystal aligns such that the columns lie either across or along the stripes. However, if the stripes are wider and/or the cooling rate is too fast, defects appear. When there are many such defects, the result is complex zigzag and wavy line optical textures, which are reminiscent of the egg and dart friezes associated with classical architecture. To a first approximation, all of these patterns can be seen as joined up fragments of developable domains in which the columns either circle a defect or propagate in a straight line. They are built up from motifs that involve bend but not splay or twist deformations; deformations that leave the two-dimensional lattice of the columnar phase unchanged. As is shown, these basic circular and straight-line motifs can be combined in a variety of different ways along the stripe but, in all of these, it is found that the defects alternate from side to side. Graphical abstract
影响因子：
19
作者：
Bramble, Jonathan P.;Tate, Daniel J.;Evans, Stephen D.
通讯作者：
Evans, Stephen D.