Emergent vortices in populations of colloidal rollers

Antoine Bricard; Jean Baptiste Caussin; Debasish Das; Charles Savoie; Vijayakumar Chikkadi; Kyohei Shitara; Oleksandr Chepizhko; Fernando Peruani; David Saintillan; Denis Bartolo

doi:10.1038/ncomms8470

Emergent vortices in populations of colloidal rollers

Antoine Bricard, Jean Baptiste Caussin, Debasish Das, Charles Savoie, Vijayakumar Chikkadi, Kyohei Shitara, Oleksandr Chepizhko, Fernando Peruani, David Saintillan, Denis Bartolo^*

^*Corresponding author for this work

Mathematics And Statistics

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Abstract

Coherent vortical motion has been reported in a wide variety of populations including living organisms (bacteria, fishes, human crowds) and synthetic active matter (shaken grains, mixtures of biopolymers), yet a unified description of the formation and structure of this pattern remains lacking. Here we report the self-organization of motile colloids into a macroscopic steadily rotating vortex. Combining physical experiments and numerical simulations, we elucidate this collective behaviour. We demonstrate that the emergent-vortex structure lives on the verge of a phase separation, and single out the very constituents responsible for this state of polar active matter. Building on this observation, we establish a continuum theory and lay out a strong foundation for the description of vortical collective motion in a broad class of motile populations constrained by geometrical boundaries.

Original language	English
Article number	7470
Number of pages	8
Journal	Nature Communications
Volume	6
DOIs	https://doi.org/10.1038/ncomms8470
Publication status	Published - 19 Jun 2015

Funding

We benefited from valuable discussions with Hugues Chaté, Nicolas Desreumaux, Olivier Dauchot, Cristina Marchetti, Julien Tailleur and John Toner. This work was partly funded by the ANR program MiTra, and Institut Universitaire de France. D.S. acknowledges partial support from the Donors of the American Chemical Society Petroleum Research Fund and from NSF CAREER Grant No. CBET-1151590. K.S. was supported by the JSPS Core-to-Core Program ‘Non-equilibrium dynamics of soft matter and information’.

Keywords

colloidal rollers
vortices

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Bricard-etal-NC2015-Emergent-vortices-populations-colloidal-rollersFinal published version, 1.04 MBLicence: CC BY 4.0

Cite this

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title = "Emergent vortices in populations of colloidal rollers",

abstract = "Coherent vortical motion has been reported in a wide variety of populations including living organisms (bacteria, fishes, human crowds) and synthetic active matter (shaken grains, mixtures of biopolymers), yet a unified description of the formation and structure of this pattern remains lacking. Here we report the self-organization of motile colloids into a macroscopic steadily rotating vortex. Combining physical experiments and numerical simulations, we elucidate this collective behaviour. We demonstrate that the emergent-vortex structure lives on the verge of a phase separation, and single out the very constituents responsible for this state of polar active matter. Building on this observation, we establish a continuum theory and lay out a strong foundation for the description of vortical collective motion in a broad class of motile populations constrained by geometrical boundaries.",

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AU - Bricard, Antoine

AU - Caussin, Jean Baptiste

AU - Das, Debasish

AU - Savoie, Charles

AU - Chikkadi, Vijayakumar

AU - Shitara, Kyohei

AU - Chepizhko, Oleksandr

AU - Peruani, Fernando

AU - Saintillan, David

AU - Bartolo, Denis

PY - 2015/6/19

Y1 - 2015/6/19

N2 - Coherent vortical motion has been reported in a wide variety of populations including living organisms (bacteria, fishes, human crowds) and synthetic active matter (shaken grains, mixtures of biopolymers), yet a unified description of the formation and structure of this pattern remains lacking. Here we report the self-organization of motile colloids into a macroscopic steadily rotating vortex. Combining physical experiments and numerical simulations, we elucidate this collective behaviour. We demonstrate that the emergent-vortex structure lives on the verge of a phase separation, and single out the very constituents responsible for this state of polar active matter. Building on this observation, we establish a continuum theory and lay out a strong foundation for the description of vortical collective motion in a broad class of motile populations constrained by geometrical boundaries.

AB - Coherent vortical motion has been reported in a wide variety of populations including living organisms (bacteria, fishes, human crowds) and synthetic active matter (shaken grains, mixtures of biopolymers), yet a unified description of the formation and structure of this pattern remains lacking. Here we report the self-organization of motile colloids into a macroscopic steadily rotating vortex. Combining physical experiments and numerical simulations, we elucidate this collective behaviour. We demonstrate that the emergent-vortex structure lives on the verge of a phase separation, and single out the very constituents responsible for this state of polar active matter. Building on this observation, we establish a continuum theory and lay out a strong foundation for the description of vortical collective motion in a broad class of motile populations constrained by geometrical boundaries.

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KW - vortices

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SN - 2041-1723

VL - 6

JO - Nature Communications

JF - Nature Communications

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ER -

Emergent vortices in populations of colloidal rollers

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