globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1910909116
论文题名:
Rotation and propulsion in 3D active chiral droplets
作者: Carenza L.N.; Gonnella G.; Marenduzzo D.; Negro G.
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:44
起始页码: 22065
结束页码: 22070
语种: 英语
英文关键词: Active fluids ; Cell motility ; Chirality ; Liquid crystals
Scopus关键词: article ; cell motility ; chirality ; dipole ; liquid crystal ; rotation ; torque
英文摘要: Chirality is a recurrent theme in the study of biological systems, in which active processes are driven by the internal conversion of chemical energy into work. Bacterial flagella, actomyosin filaments, and microtubule bundles are active systems that are also intrinsically chiral. Despite some exploratory attempt to capture the relations between chirality and motility, many features of intrinsically chiral systems still need to be explored and explained. To address this gap in knowledge, here we study the effects of internal active forces and torques on a 3-dimensional (3D) droplet of cholesteric liquid crystal (CLC) embedded in an isotropic liquid. We consider tangential anchoring of the liquid crystal director at the droplet surface. Contrary to what happens in nematics, where moderate extensile activity leads to droplet rotation, cholesteric active droplets exhibit more complex and variegated behaviors. We find that extensile force dipole activity stabilizes complex defect configurations, in which orbiting dynamics couples to thermodynamic chirality to propel screw-like droplet motion. Instead, dipolar torque activity may either tighten or unwind the cholesteric helix and if tuned, can power rotations with an oscillatory angular velocity of 0 mean. © 2019 National Academy of Sciences. All rights reserved.
Citation statistics:
被引频次[WOS]:41   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163520
Appears in Collections:气候变化与战略

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作者单位: Carenza, L.N., Dipartimento di Fisica, Universit À Degli Studi di Bari, Istituto Nazioneale di Fisica Nucleare, Sezione di Bari, Bari, I-70126, Italy; Gonnella, G., Dipartimento di Fisica, Universit À Degli Studi di Bari, Istituto Nazioneale di Fisica Nucleare, Sezione di Bari, Bari, I-70126, Italy; Marenduzzo, D., Scottish Universities Physics Alliance, School of Physics and Astronomy, University of Edinburgh, Edinburgh, EH9 3JZ, United Kingdom; Negro, G., Dipartimento di Fisica, Universit À Degli Studi di Bari, Istituto Nazioneale di Fisica Nucleare, Sezione di Bari, Bari, I-70126, Italy

Recommended Citation:
Carenza L.N.,Gonnella G.,Marenduzzo D.,et al. Rotation and propulsion in 3D active chiral droplets[J]. Proceedings of the National Academy of Sciences of the United States of America,2019-01-01,116(44)
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