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题名

The fate of liquid crystal topological defects on chemically patterned surfaces during phase transitions

作者
通讯作者Zhang, Rui; Li, Xiao
发表日期
2022-07-01
DOI
发表期刊
ISSN
1744-683X
EISSN
1744-6848
卷号18期号:32页码:5939-5948
摘要
Controlling topological defects in liquid crystals (LCs) is an essential element in the development of areas such as directed self-assembly and micropatterning materials. However, during the phase transition on confined patterned surfaces, how the morphologies in one liquid crystalline phase change from deformations or defects into another phase is much less known. Here, we examine the fate of defects in a LC confined on a patterned surface during smectic-A-nematic and nematic-isotropic phase transitions, using experiments and simulation analyses. Upon heating from smectic-A to nematic, a Toric focal conical domain (TFCD) melts into a +1 converging boojum defect, which then transitioned into a concentric configuration as temperature increases, attributed to a steeper decrease of the bend and twist modulus compared to splay modulus. During cooling, TFCDs are developed from two distinct pathways depending on the cooling rates. Our continuum simulation recapitulates these transformations and provides elastic constant-based explanations for the two pathways. Although the phase transition pathways of defects are independent of the geometry of the confined patterns, the arrangement of FCDs is highly dependent on the size and shape of the patterns. Taken together, this simple approach offers promising opportunities for tuning the micro- or nano-patterning of topological defects in liquid crystals.
相关链接[来源记录]
收录类别
SCI ; EI
语种
英语
学校署名
其他
资助项目
DOE Office of Science[DE-AC02-06CH11357] ; Hong Kong Research Grants Council[16300221]
WOS研究方向
Chemistry ; Materials Science ; Physics ; Polymer Science
WOS类目
Chemistry, Physical ; Materials Science, Multidisciplinary ; Physics, Multidisciplinary ; Polymer Science
WOS记录号
WOS:000828209700001
出版者
EI入藏号
20223112459557
EI主题词
Phase change materials ; Topology
EI分类号
Combinatorial Mathematics, Includes Graph Theory, Set Theory:921.4
来源库
Web of Science
引用统计
被引频次[WOS]:4
成果类型期刊论文
条目标识符http://sustech.caswiz.com/handle/2SGJ60CL/359474
专题工学院_机械与能源工程系
作者单位
1.Univ North Texas, Mat Sci & Engn Dept, Denton, TX 76203 USA
2.Hongkong Univ Sci & Technol, Dept Phys, Hong Kong, Peoples R China
3.Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen, Guangdong, Peoples R China
推荐引用方式
GB/T 7714
Pawale, Tejal,Yi, Shengzhu,Wang, Xiaowei,et al. The fate of liquid crystal topological defects on chemically patterned surfaces during phase transitions[J]. Soft Matter,2022,18(32):5939-5948.
APA
Pawale, Tejal,Yi, Shengzhu,Wang, Xiaowei,Zhang, Rui,&Li, Xiao.(2022).The fate of liquid crystal topological defects on chemically patterned surfaces during phase transitions.Soft Matter,18(32),5939-5948.
MLA
Pawale, Tejal,et al."The fate of liquid crystal topological defects on chemically patterned surfaces during phase transitions".Soft Matter 18.32(2022):5939-5948.
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