Magnetically driven confined colloids: From enhanced diffusion to bidirectional transport

Inspired by previous experimental results, we use numerical simulations to investigate the collective dynamics of paramagnetic colloidal particles confined between two plates closer than twice the particle diameter and driven by an external precessing magnetic field. We show that, when the field is...

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Detalles Bibliográficos
Autores: Ostinato, Mattia, Ortiz-Ambriz, Antonio, Tierno, Pietro
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2024
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/219367
Acceso en línea:https://hdl.handle.net/2445/219367
Access Level:acceso abierto
Palabra clave:Camps magnètics
Col·loides
Difusió
Magnetic fields
Colloids
Diffusion
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spelling Magnetically driven confined colloids: From enhanced diffusion to bidirectional transportOstinato, MattiaOrtiz-Ambriz, AntonioTierno, PietroCamps magnèticsCol·loidesDifusióMagnetic fieldsColloidsDiffusionInspired by previous experimental results, we use numerical simulations to investigate the collective dynamics of paramagnetic colloidal particles confined between two plates closer than twice the particle diameter and driven by an external precessing magnetic field. We show that, when the field is spatially isotropic there is no net particle current and the colloids display enhanced diffusive dynamics with an effective diffusion coefficient which raises up to 60 times that of the undriven case. In contrast, when the field is spatially anisotropic due to a small tilt angle , the particles organize into a robust bidirectional current, flowing along two parallel planes by periodically exchanging their positions. In this regime, we also analyze how the presence of small impurities which can be described as “magnetic holes” affect the particle current breaking the bidirectional flow. Our system provides a general method to transport magnetic colloids in a viscous fluid, without using any field gradient, but based on the fine balance between confinement and magnetic dipolar interactions.Elsevier B.V.2024info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/219367Articles publicats en revistes (Física de la Matèria Condensada)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/10.1016/j.jmmm.2023.171701Journal of Magnetism and Magnetic Materials, 2024, vol. 591https://doi.org/10.1016/j.jmmm.2023.171701cc-by-nc-nd (c) Ostinato, Mattia, et al., 2024http://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/2193672026-05-27T06:46:51Z
dc.title.none.fl_str_mv Magnetically driven confined colloids: From enhanced diffusion to bidirectional transport
title Magnetically driven confined colloids: From enhanced diffusion to bidirectional transport
spellingShingle Magnetically driven confined colloids: From enhanced diffusion to bidirectional transport
Ostinato, Mattia
Camps magnètics
Col·loides
Difusió
Magnetic fields
Colloids
Diffusion
title_short Magnetically driven confined colloids: From enhanced diffusion to bidirectional transport
title_full Magnetically driven confined colloids: From enhanced diffusion to bidirectional transport
title_fullStr Magnetically driven confined colloids: From enhanced diffusion to bidirectional transport
title_full_unstemmed Magnetically driven confined colloids: From enhanced diffusion to bidirectional transport
title_sort Magnetically driven confined colloids: From enhanced diffusion to bidirectional transport
dc.creator.none.fl_str_mv Ostinato, Mattia
Ortiz-Ambriz, Antonio
Tierno, Pietro
author Ostinato, Mattia
author_facet Ostinato, Mattia
Ortiz-Ambriz, Antonio
Tierno, Pietro
author_role author
author2 Ortiz-Ambriz, Antonio
Tierno, Pietro
author2_role author
author
dc.subject.none.fl_str_mv Camps magnètics
Col·loides
Difusió
Magnetic fields
Colloids
Diffusion
topic Camps magnètics
Col·loides
Difusió
Magnetic fields
Colloids
Diffusion
description Inspired by previous experimental results, we use numerical simulations to investigate the collective dynamics of paramagnetic colloidal particles confined between two plates closer than twice the particle diameter and driven by an external precessing magnetic field. We show that, when the field is spatially isotropic there is no net particle current and the colloids display enhanced diffusive dynamics with an effective diffusion coefficient which raises up to 60 times that of the undriven case. In contrast, when the field is spatially anisotropic due to a small tilt angle , the particles organize into a robust bidirectional current, flowing along two parallel planes by periodically exchanging their positions. In this regime, we also analyze how the presence of small impurities which can be described as “magnetic holes” affect the particle current breaking the bidirectional flow. Our system provides a general method to transport magnetic colloids in a viscous fluid, without using any field gradient, but based on the fine balance between confinement and magnetic dipolar interactions.
publishDate 2024
dc.date.none.fl_str_mv 2024
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/2445/219367
url https://hdl.handle.net/2445/219367
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/10.1016/j.jmmm.2023.171701
Journal of Magnetism and Magnetic Materials, 2024, vol. 591
https://doi.org/10.1016/j.jmmm.2023.171701
dc.rights.none.fl_str_mv cc-by-nc-nd (c) Ostinato, Mattia, et al., 2024
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by-nc-nd (c) Ostinato, Mattia, et al., 2024
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier B.V.
publisher.none.fl_str_mv Elsevier B.V.
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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