| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Edge Transport and Self-Assembly of Passive Objects in a Chiral Active Fluid |
| Qing Yang1,2, Huan Liang1,2, Rui Liu1, Ke Chen1,2,3, Fangfu Ye1,2,3,4*, and Mingcheng Yang1,2,3* |
1Beijing National Laboratory for Condensed Matter Physics and Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
3Songshan Lake Materials Laboratory, Dongguan 523808, China
4Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou 325001, China
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| Cite this article: |
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Qing Yang, Huan Liang, Rui Liu et al 2021 Chin. Phys. Lett. 38 128701 |
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Abstract Topological edge flow and dissipationless odd viscosity are two remarkable features of chiral active fluids composed of active spinners. These features can significantly influence the dynamics of suspended passive particles and the interactions between the particles. By computer simulations, we investigate the transport phenomenon of anisotropic passive objects and the self-assembly behavior of passive spherical particles in the active spinner fluid. It is found that in confined systems, nonspherical passive objects can stably cling to boundary walls and are unidirectionally and robustly transported by edge flow of spinners. Furthermore, in an unconfined system, passive spherical particles are able to form stable clusters that spontaneously and unidirectionally rotate as a whole. In these phenomena, strong particle-wall and interparticle effective attractions play a vital role, which originate from spinner-mediated depletion-like interactions and can be largely enhanced by odd viscosity of spinner fluids. Our results thus provide new insight into the robust transport of cargoes and the nonequilibrium self-assembly of passive intruders.
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Received: 08 October 2021
Editors' Suggestion
Published: 08 December 2021
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| PACS: |
64.75.Xc
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(Phase separation and segregation in colloidal systems)
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64.75.Gh
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(Phase separation and segregation in model systems (hard spheres, Lennard-Jones, etc.))
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64.75.Yz
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(Self-assembly)
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| Fund: Supported by the National Natural Science Foundation of China (Grant Nos. 11874397, 11774393, 11774394, and 11974044), and the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB33030300). |
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