globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1816733116
论文题名:
Self-organized dynamics and the transition to turbulence of confined active nematics
作者: Opathalage A.; Norton M.M.; Juniper M.P.N.; Langeslay B.; Aghvami S.A.; Fraden S.; Dogic Z.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2019
卷: 116, 期:11
起始页码: 4788
结束页码: 4797
语种: 英语
英文关键词: Active matter ; Liquid crystals ; Pattern formation ; Self-organization ; Topological defects
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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163606
Appears in Collections:气候变化与战略

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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

Recommended Citation:
Opathalage A.,Norton M.M.,Juniper M.P.N.,et al. Self-organized dynamics and the transition to turbulence of confined active nematics[J]. Proceedings of the National Academy of Sciences of the United States of America,2019-01-01,116(11)
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