Sedimentation and structural features of suspensions of squirmer-like microswimmers under agravitational field

The effect of gravity on the collective motion of living microswimmers, such as bacteria and micro-algae, is pivotal to unravel not only bio-convection patterns but also the settling of bacterial biofilms on solid surfaces. In this work, we investigate suspensions of microswimmers under the influenc...

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Autores: Barriuso Gutiérrez, C. Miguel, Serna, Horacio, Pagonabarraga Mora, Ignacio, Valeriani, Chantal
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2025
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:dnet:ubarcelona__::6e507a593bfe139f09de55c9eaf2738e
Acceso en línea:https://hdl.handle.net/2445/229064
Access Level:acceso abierto
Palabra clave:sedimentation, squirmer suspensions, squirmer
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spelling Sedimentation and structural features of suspensions of squirmer-like microswimmers under agravitational fieldBarriuso Gutiérrez, C. MiguelSerna, HoracioPagonabarraga Mora, IgnacioValeriani, Chantalsedimentation, squirmer suspensions, squirmerThe effect of gravity on the collective motion of living microswimmers, such as bacteria and micro-algae, is pivotal to unravel not only bio-convection patterns but also the settling of bacterial biofilms on solid surfaces. In this work, we investigate suspensions of microswimmers under the influence of a gravitational field and hydrodynamics, simulated <em>via</em> the dissipative particle dynamics (DPD) coarse-grained model. We first study the collective sedimentation of passive colloids and microswimmers of the puller and pusher types upon increasing the imposed gravitational field and compare them with previous results. Once sedimentation occurs, we observe that, as the gravitational field increases, the bottom layer undergoes a transition to an ordered state compatible with a hexagonal crystal. In comparison with passive colloids, both pullers and pushers easily rearrange at the bottom layer to anneal defects. Specifically, pullers are better than pushers in preserving the hexagonal order of the bottom mono-layer at high gravitational fields.Royal Society of Chemistry2025info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/229064Articles publicats en revistes (Física de la Matèria Condensada)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/10.1039/d4sm01356eSoft Matter, 2025, vol. 21, num.11, p. 1-17https://doi.org/10.1039/d4sm01356ecc-by (c) Barriuso, C.M. et al., 2025https://creativecommons.org/li censes/by/3.0/info:eu-repo/semantics/openAccessoai:dnet:ubarcelona__::6e507a593bfe139f09de55c9eaf2738e2026-05-27T06:46:51Z
dc.title.none.fl_str_mv Sedimentation and structural features of suspensions of squirmer-like microswimmers under agravitational field
title Sedimentation and structural features of suspensions of squirmer-like microswimmers under agravitational field
spellingShingle Sedimentation and structural features of suspensions of squirmer-like microswimmers under agravitational field
Barriuso Gutiérrez, C. Miguel
sedimentation, squirmer suspensions, squirmer
title_short Sedimentation and structural features of suspensions of squirmer-like microswimmers under agravitational field
title_full Sedimentation and structural features of suspensions of squirmer-like microswimmers under agravitational field
title_fullStr Sedimentation and structural features of suspensions of squirmer-like microswimmers under agravitational field
title_full_unstemmed Sedimentation and structural features of suspensions of squirmer-like microswimmers under agravitational field
title_sort Sedimentation and structural features of suspensions of squirmer-like microswimmers under agravitational field
dc.creator.none.fl_str_mv Barriuso Gutiérrez, C. Miguel
Serna, Horacio
Pagonabarraga Mora, Ignacio
Valeriani, Chantal
author Barriuso Gutiérrez, C. Miguel
author_facet Barriuso Gutiérrez, C. Miguel
Serna, Horacio
Pagonabarraga Mora, Ignacio
Valeriani, Chantal
author_role author
author2 Serna, Horacio
Pagonabarraga Mora, Ignacio
Valeriani, Chantal
author2_role author
author
author
dc.subject.none.fl_str_mv sedimentation, squirmer suspensions, squirmer
topic sedimentation, squirmer suspensions, squirmer
description The effect of gravity on the collective motion of living microswimmers, such as bacteria and micro-algae, is pivotal to unravel not only bio-convection patterns but also the settling of bacterial biofilms on solid surfaces. In this work, we investigate suspensions of microswimmers under the influence of a gravitational field and hydrodynamics, simulated <em>via</em> the dissipative particle dynamics (DPD) coarse-grained model. We first study the collective sedimentation of passive colloids and microswimmers of the puller and pusher types upon increasing the imposed gravitational field and compare them with previous results. Once sedimentation occurs, we observe that, as the gravitational field increases, the bottom layer undergoes a transition to an ordered state compatible with a hexagonal crystal. In comparison with passive colloids, both pullers and pushers easily rearrange at the bottom layer to anneal defects. Specifically, pullers are better than pushers in preserving the hexagonal order of the bottom mono-layer at high gravitational fields.
publishDate 2025
dc.date.none.fl_str_mv 2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/229064
url https://hdl.handle.net/2445/229064
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1039/d4sm01356e
Soft Matter, 2025, vol. 21, num.11, p. 1-17
https://doi.org/10.1039/d4sm01356e
dc.rights.none.fl_str_mv cc-by (c) Barriuso, C.M. et al., 2025
https://creativecommons.org/li censes/by/3.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by (c) Barriuso, C.M. et al., 2025
https://creativecommons.org/li censes/by/3.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Royal Society of Chemistry
publisher.none.fl_str_mv Royal Society of Chemistry
dc.source.none.fl_str_mv Articles publicats en revistes (Física de la Matèria Condensada)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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