气候变化领域集成服务门户(CCPortal): Electrically powered motions of toron crystallites in chiral liquid crystals

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DOI	10.1073/pnas.1922198117
	Electrically powered motions of toron crystallites in chiral liquid crystals
	Sohn H.R.O.; Smalyukh I.I.
发表日期	2020
ISSN	0027-8424
起始页码	6437
结束页码	6445
卷号	117 期号:12
英文摘要	Malleability of metals is an example of how the dynamics of defects like dislocations induced by external stresses alters material properties and enables technological applications. However, these defects move merely to comply with the mechanical forces applied on macroscopic scales, whereas the molecular and atomic building blocks behave like rigid particles. Here, we demonstrate how motions of crystallites and the defects between them can arise within the soft matter medium in an oscillating electric field applied to a chiral liquid crystal with polycrystalline quasi-hexagonal arrangements of self-assembled topological solitons called 'torons.” Periodic oscillations of electric field applied perpendicular to the plane of hexagonal lattices prompt repetitive shear-like deformations of the solitons, which synchronize the electrically powered self-shearing directions. The temporal evolution of deformations upon turning voltage on and off is not invariant upon reversal of time, prompting lateral translations of the crystallites of torons within quasi-hexagonal periodically deformed lattices. We probe how these motions depend on voltage and frequency of oscillating field applied in an experimental geometry resembling that of liquid crystal displays. We study the interrelations between synchronized deformations of the soft solitonic particles and their arrays, and the ensuing dynamics and giant number fluctuations mediated by motions of crystallites, five-seven defects pairs, and grain boundaries in the orderly organizations of solitons. We discuss how our findings may lead to technological and fundamental science applications of dynamic self-assemblies of topologically protected but highly deformable particle-like solitons. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Active matter; Defect dynamics; Liquid crystals; Self-assembly; Topological solitons
语种	英语
scopus关键词	article; chirality; electric field; geometry; grain; human; liquid crystal; organization; oscillation
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160304
作者单位	Sohn, H.R.O., Department of Physics and Materials Science and Engineering Program, University of Colorado, Boulder, CO 80309, United States; Smalyukh, I.I., Department of Physics and Materials Science and Engineering Program, University of Colorado, Boulder, CO 80309, United States, Department of Electrical, Computer and Energy Engineering, University of Colorado, Boulder, CO 80309, United States, Soft Materials Research Center, University of Colorado, Boulder, CO 80309, United States, Renewable and Sustainable Energy Institute, National Renewable Energy Laboratory, University of Colorado, Boulder, CO 80309, United States
推荐引用方式 GB/T 7714	Sohn H.R.O.,Smalyukh I.I.. Electrically powered motions of toron crystallites in chiral liquid crystals[J],2020,117(12).
APA	Sohn H.R.O.,&Smalyukh I.I..(2020).Electrically powered motions of toron crystallites in chiral liquid crystals.Proceedings of the National Academy of Sciences of the United States of America,117(12).
MLA	Sohn H.R.O.,et al."Electrically powered motions of toron crystallites in chiral liquid crystals".Proceedings of the National Academy of Sciences of the United States of America 117.12(2020).