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Title: Rapid expulsion of microswimmers by a vortical flow

Abstract

Interactions of microswimmers with their fluid environment are exceptionally complex. Macroscopic shear flow alters swimming trajectories in a highly nontrivial way and results in dramatic reduction of viscosity and heterogeneous bacterial distributions. Here we report on experimental and theoretical studies of rapid expulsion of microswimmers, such as motile bacteria, by a vortical flow created by a rotating microparticle. We observe a formation of a macroscopic depletion area in a high-shear region, in the vicinity of a microparticle. The rapid migration of bacteria from the shear-rich area is caused by a vortical structure of the flow rather than intrinsic random fluctuations of bacteria orientations, in stark contrast to planar shear flow. Our mathematical model reveals that expulsion is a combined effect of motility and alignment by a vortical flow. Our findings offer a novel approach for manipulation of motile microorganisms and shed light on bacteria-flow interactions.

Authors:
 [1];  [2]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Northwestern Univ., Evanston, IL (United States). Dept. of Engineering Sciences and Applied Mathematics
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Institutes of Health (NIH)
OSTI Identifier:
1339100
Grant/Contract Number:  
AC02-06CH11357; 1R01GM104978-01
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; 36 MATERIALS SCIENCE

Citation Formats

Sokolov, Andrey, and Aranson, Igor S. Rapid expulsion of microswimmers by a vortical flow. United States: N. p., 2016. Web. doi:10.1038/ncomms11114.
Sokolov, Andrey, & Aranson, Igor S. Rapid expulsion of microswimmers by a vortical flow. United States. https://doi.org/10.1038/ncomms11114
Sokolov, Andrey, and Aranson, Igor S. Wed . "Rapid expulsion of microswimmers by a vortical flow". United States. https://doi.org/10.1038/ncomms11114. https://www.osti.gov/servlets/purl/1339100.
@article{osti_1339100,
title = {Rapid expulsion of microswimmers by a vortical flow},
author = {Sokolov, Andrey and Aranson, Igor S.},
abstractNote = {Interactions of microswimmers with their fluid environment are exceptionally complex. Macroscopic shear flow alters swimming trajectories in a highly nontrivial way and results in dramatic reduction of viscosity and heterogeneous bacterial distributions. Here we report on experimental and theoretical studies of rapid expulsion of microswimmers, such as motile bacteria, by a vortical flow created by a rotating microparticle. We observe a formation of a macroscopic depletion area in a high-shear region, in the vicinity of a microparticle. The rapid migration of bacteria from the shear-rich area is caused by a vortical structure of the flow rather than intrinsic random fluctuations of bacteria orientations, in stark contrast to planar shear flow. Our mathematical model reveals that expulsion is a combined effect of motility and alignment by a vortical flow. Our findings offer a novel approach for manipulation of motile microorganisms and shed light on bacteria-flow interactions.},
doi = {10.1038/ncomms11114},
journal = {Nature Communications},
number = ,
volume = 7,
place = {United States},
year = {Wed Mar 23 00:00:00 EDT 2016},
month = {Wed Mar 23 00:00:00 EDT 2016}
}

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Cited by: 31 works
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