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  Spontaneously rotating clusters of active droplets

Vajdi Hokmabad, B., Nishide, A., Ramesh, P., Krüger, C., & Maass, C. C. (2022). Spontaneously rotating clusters of active droplets. Soft Matter, 18, 2731-2741. doi:10.1039/D1SM01795K.

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 Creators:
Vajdi Hokmabad, Babak1, Author              
Nishide, Akinori1, Author              
Ramesh, Prashanth1, Author              
Krüger, Carsten2, Author              
Maass, Corinna C.1, Author              
Affiliations:
1Group Active soft matter, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063307              
2Group Granular matter and irreversibility, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063306              

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 Abstract: We report on the emergence of spontaneously rotating clusters in active emulsions. Ensembles of selfpropelling droplets sediment and then self-organise into planar, hexagonally ordered clusters which hover over the container bottom while spinning around the plane normal. This effect exists for symmetric and asymmetric arrangements of isotropic droplets and is therefore not caused by torques due to geometric asymmetries. We found, however, that individual droplets exhibit a helical swimming mode in a small window of intermediate activity in a force-free bulk medium. We show that by forming an ordered cluster, the droplets cooperatively suppress their chaotic dynamics and turn the transient instability into a steady rotational state. We analyse the collective rotational dynamics as a function of droplet activity and cluster size and further propose that the stable collective rotation in the cluster is caused by a cooperative coupling between the rotational modes of individual droplets in the cluster.

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Language(s): eng - English
 Dates: 2022-03-172022
 Publication Status: Published in print
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 Identifiers: DOI: 10.1039/D1SM01795K
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Title: Soft Matter
Source Genre: Journal
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Pages: - Volume / Issue: 18 Sequence Number: - Start / End Page: 2731 - 2741 Identifier: ISSN: 1744-683X
ISSN: 1744-6848