Generic Long-Range Interactions Between Passive Bodies in an Active Fluid

Physical Review Letters
Yongjoo BaekYariv Kafri

Abstract

A single nonspherical body placed in an active fluid generates currents via breaking of time-reversal symmetry. We show that, when two or more passive bodies are placed in an active fluid, these currents lead to long-range interactions. Using a multipole expansion, we characterize their leading-order behaviors in terms of single-body properties and show that they decay as a power law with the distance between the bodies, are anisotropic, and do not obey an action-reaction principle. The interactions lead to rich dynamics of the bodies, illustrated by the spontaneous synchronized rotation of pinned nonchiral bodies and the formation of traveling bound pairs. The occurrence of these phenomena depends on tunable properties of the bodies, thus opening new possibilities for self-assembly mediated by active fluids.

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Citations

Mar 5, 2020·Soft Matter·Thomas Speck
Feb 3, 2019·The Journal of Chemical Physics·Chao WangKang Chen
Apr 22, 2019·The Journal of Chemical Physics·Yi-Qi XiaKang Chen
Dec 25, 2019·Physical Review. E·Ydan Ben DorAlexandre P Solon
Feb 15, 2020·Physical Review Letters·Ananyo Maitra, Raphael Voituriez
Sep 25, 2020·Scientific Reports·Mahmoud Sebtosheikh, Ali Naji
Nov 10, 2018·The Journal of Chemical Physics·Jeroen RodenburgRené van Roij
Mar 3, 2020·The Journal of Chemical Physics·Christian M RohwerMatthias Krüger
Jul 9, 2020·Physical Review Letters·R ZakineF van Wijland
May 2, 2020·Physical Review Letters·Peng LiuMingcheng Yang
Nov 28, 2019·Physical Review. E·Caleb G WagnerAparna Baskaran
Oct 21, 2020·Physical Review. E·Mahdi Zarif, Ali Naji
Dec 2, 2020·Physical Review Letters·Christian Maes
Feb 13, 2021·Physical Review Letters·Sunghan RoJulien Tailleur
Mar 20, 2021·Physical Review. E·Fane FengNanrong Zhao
Apr 17, 2021·Physical Review Letters·Thomas Speck, Ashreya Jayaram
Aug 7, 2021·Physical Review Letters·Benoît Mahault, Hugues Chaté

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