气候变化领域集成服务门户(CCPortal): Self-organized dynamics and the transition to turbulence of confined active nematics

CCPortal

DOI	10.1073/pnas.1816733116
	Self-organized dynamics and the transition to turbulence of confined active nematics
	Opathalage A.; Norton M.M.; Juniper M.P.N.; Langeslay B.; Aghvami S.A.; Fraden S.; Dogic Z.
发表日期	2019
ISSN	0027-8424
起始页码	4788
结束页码	4797
卷号	116 期号:11
英文摘要	We study how confinement transforms the chaotic dynamics of bulk microtubule-based active nematics into regular spatiotemporal patterns. For weak confinements in disks, multiple continuously nucleating and annihilating topological defects self-organize into persistent circular flows of either handedness. Increasing confinement strength leads to the emergence of distinct dynamics, in which the slow periodic nucleation of topological defects at the boundary is superimposed onto a fast procession of a pair of defects. A defect pair migrates toward the confinement core over multiple rotation cycles, while the associated nematic director field evolves from a distinct double spiral toward a nearly circularly symmetric configuration. The collapse of the defect orbits is punctuated by another boundary-localized nucleation event, that sets up long-term doubly periodic dynamics. Comparing experimental data to a theoretical model of an active nematic reveals that theory captures the fast procession of a pair of +1/2 defects, but not the slow spiral transformation nor the periodic nucleation of defect pairs. Theory also fails to predict the emergence of circular flows in the weak confinement regime. The developed confinement methods are generalized to more complex geometries, providing a robust microfluidic platform for rationally engineering 2D autonomous flows. 2019 © National Academy of Sciences. All Rights Reserved.
英文关键词	Active matter; Liquid crystals; Pattern formation; Self-organization; Topological defects
语种	英语
scopus关键词	active nematics; Article; chaotic dynamics; controlled study; dynamics; flow kinetics; geometry; liquid crystal; microfluidics; microtubule; physical phenomena; priority journal; rotation; self organized dynamics; theoretical model
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/160413
作者单位	Opathalage, A., Department of Physics, Brandeis University, Waltham, MA 02453, United States; Norton, M.M., Department of Physics, Brandeis University, Waltham, MA 02453, United States; Juniper, M.P.N., Department of Physics, Brandeis University, Waltham, MA 02453, United States; Langeslay, B., Department of Physics, Brandeis University, Waltham, MA 02453, United States; Aghvami, S.A., Department of Physics, Brandeis University, Waltham, MA 02453, United States; Fraden, S., Department of Physics, Brandeis University, Waltham, MA 02453, United States; Dogic, Z., Department of Physics, Brandeis University, Waltham, MA 02453, United States, Department of Physics, University of California, Santa Barbara, CA 93106, United States
推荐引用方式 GB/T 7714	Opathalage A.,Norton M.M.,Juniper M.P.N.,et al. Self-organized dynamics and the transition to turbulence of confined active nematics[J],2019,116(11).
APA	Opathalage A..,Norton M.M..,Juniper M.P.N..,Langeslay B..,Aghvami S.A..,...&Dogic Z..(2019).Self-organized dynamics and the transition to turbulence of confined active nematics.Proceedings of the National Academy of Sciences of the United States of America,116(11).
MLA	Opathalage A.,et al."Self-organized dynamics and the transition to turbulence of confined active nematics".Proceedings of the National Academy of Sciences of the United States of America 116.11(2019).