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:
-
- Northwestern Univ., Evanston, IL (United States); Argonne National Lab. (ANL), Lemont, IL (United States); Univ. of Ljubljana (Slovenia)
- Northwestern Univ., Evanston, IL (United States)
- 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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