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Title: Spontaneous self-propulsion and nonequilibrium shape fluctuations of a droplet enclosing active particles

Abstract

Active particles, such as swimming bacteria or self-propelled colloids, spontaneously assemble into large-scale dynamic structures. Geometric boundaries often enforce different spatio-temporal patterns compared to unconfined environment and thus provide a platform to control the behavior of active matter. Here, we report collective dynamics of active particles enclosed by soft, deformable boundary, that is responsive to the particles’ activity. We reveal that a quasi two-dimensional fluid droplet enclosing motile colloids powered by the Quincke effect (Quincke rollers) exhibits strong shape fluctuations with a power spectrum consistent with active fluctuations driven by particle-interface collisions. A broken detailed balance confirms the nonequilibrium nature of the shape dynamics. We further find that rollers self-organize into a single drop-spanning vortex, which can undergo a spontaneous symmetry breaking and vortex splitting. The droplet acquires motility while the vortex doublet exists. Our findings provide insights into the complex collective behavior of active colloidal suspensions in soft confinement.

Authors:
 [1];  [2];  [2]; ORCiD logo [3]; ORCiD logo [2]
  1. Northwestern Univ., Evanston, IL (United States); Argonne National Lab. (ANL), Lemont, IL (United States); Univ. of Ljubljana (Slovenia)
  2. Northwestern Univ., Evanston, IL (United States)
  3. Argonne National Lab. (ANL), Lemont, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF)
OSTI Identifier:
1869167
Grant/Contract Number:  
AC02-06CH11357; DMR-2004926
Resource Type:
Accepted Manuscript
Journal Name:
Communications Physics
Additional Journal Information:
Journal Volume: 5; Journal Issue: 1; Journal ID: ISSN 2399-3650
Publisher:
Springer Nature
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Kokot, Gašper, Faizi, Hammad A., Pradillo, Gerardo E., Snezhko, Alexey, and Vlahovska, Petia M.. Spontaneous self-propulsion and nonequilibrium shape fluctuations of a droplet enclosing active particles. United States: N. p., 2022. Web. doi:10.1038/s42005-022-00872-9.
Kokot, Gašper, Faizi, Hammad A., Pradillo, Gerardo E., Snezhko, Alexey, & Vlahovska, Petia M.. Spontaneous self-propulsion and nonequilibrium shape fluctuations of a droplet enclosing active particles. United States. https://doi.org/10.1038/s42005-022-00872-9
Kokot, Gašper, Faizi, Hammad A., Pradillo, Gerardo E., Snezhko, Alexey, and Vlahovska, Petia M.. Thu . "Spontaneous self-propulsion and nonequilibrium shape fluctuations of a droplet enclosing active particles". United States. https://doi.org/10.1038/s42005-022-00872-9. https://www.osti.gov/servlets/purl/1869167.
@article{osti_1869167,
title = {Spontaneous self-propulsion and nonequilibrium shape fluctuations of a droplet enclosing active particles},
author = {Kokot, Gašper and Faizi, Hammad A. and Pradillo, Gerardo E. and Snezhko, Alexey and Vlahovska, Petia M.},
abstractNote = {Active particles, such as swimming bacteria or self-propelled colloids, spontaneously assemble into large-scale dynamic structures. Geometric boundaries often enforce different spatio-temporal patterns compared to unconfined environment and thus provide a platform to control the behavior of active matter. Here, we report collective dynamics of active particles enclosed by soft, deformable boundary, that is responsive to the particles’ activity. We reveal that a quasi two-dimensional fluid droplet enclosing motile colloids powered by the Quincke effect (Quincke rollers) exhibits strong shape fluctuations with a power spectrum consistent with active fluctuations driven by particle-interface collisions. A broken detailed balance confirms the nonequilibrium nature of the shape dynamics. We further find that rollers self-organize into a single drop-spanning vortex, which can undergo a spontaneous symmetry breaking and vortex splitting. The droplet acquires motility while the vortex doublet exists. Our findings provide insights into the complex collective behavior of active colloidal suspensions in soft confinement.},
doi = {10.1038/s42005-022-00872-9},
journal = {Communications Physics},
number = 1,
volume = 5,
place = {United States},
year = {2022},
month = {4}
}

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