Flow coupling between active and passive fluids across water–oil interfaces

Abstract Active fluid droplets surrounded by oil can spontaneously develop circulatory flows. However, the dynamics of the surrounding oil and their influence on the active fluid remain poorly understood. To investigate interactions between the active fluid and the passive oil across their interface...

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Autores principales:	Yen-Chen Chen, Brock Jolicoeur, Chih-Che Chueh, Kun-Ta Wu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/5981bd6349b1423a8e563a1cad557f42
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spelling	oai:doaj.org-article:5981bd6349b1423a8e563a1cad557f422021-12-02T18:34:06ZFlow coupling between active and passive fluids across water–oil interfaces10.1038/s41598-021-93310-92045-2322https://doaj.org/article/5981bd6349b1423a8e563a1cad557f422021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-93310-9https://doaj.org/toc/2045-2322Abstract Active fluid droplets surrounded by oil can spontaneously develop circulatory flows. However, the dynamics of the surrounding oil and their influence on the active fluid remain poorly understood. To investigate interactions between the active fluid and the passive oil across their interface, kinesin-driven microtubule-based active fluid droplets were immersed in oil and compressed into a cylinder-like shape. The droplet geometry supported intradroplet circulatory flows, but the circulation was suppressed when the thickness of the oil layer surrounding the droplet decreased. Experiments with tracers and network structure analyses and continuum models based on the dynamics of self-elongating rods demonstrated that the flow transition resulted from flow coupling across the interface between active fluid and oil, with a millimeter–scale coupling length. In addition, two novel millifluidic devices were developed that could trigger and suppress intradroplet circulatory flows in real time: one by changing the thickness of the surrounding oil layer and the other by locally deforming the droplet. This work highlights the role of interfacial dynamics in the active fluid droplet system and shows that circulatory flows within droplets can be affected by millimeter–scale flow coupling across the interface between the active fluid and the oil.Yen-Chen ChenBrock JolicoeurChih-Che ChuehKun-Ta WuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-16 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yen-Chen Chen Brock Jolicoeur Chih-Che Chueh Kun-Ta Wu Flow coupling between active and passive fluids across water–oil interfaces
description	Abstract Active fluid droplets surrounded by oil can spontaneously develop circulatory flows. However, the dynamics of the surrounding oil and their influence on the active fluid remain poorly understood. To investigate interactions between the active fluid and the passive oil across their interface, kinesin-driven microtubule-based active fluid droplets were immersed in oil and compressed into a cylinder-like shape. The droplet geometry supported intradroplet circulatory flows, but the circulation was suppressed when the thickness of the oil layer surrounding the droplet decreased. Experiments with tracers and network structure analyses and continuum models based on the dynamics of self-elongating rods demonstrated that the flow transition resulted from flow coupling across the interface between active fluid and oil, with a millimeter–scale coupling length. In addition, two novel millifluidic devices were developed that could trigger and suppress intradroplet circulatory flows in real time: one by changing the thickness of the surrounding oil layer and the other by locally deforming the droplet. This work highlights the role of interfacial dynamics in the active fluid droplet system and shows that circulatory flows within droplets can be affected by millimeter–scale flow coupling across the interface between the active fluid and the oil.
format	article
author	Yen-Chen Chen Brock Jolicoeur Chih-Che Chueh Kun-Ta Wu
author_facet	Yen-Chen Chen Brock Jolicoeur Chih-Che Chueh Kun-Ta Wu
author_sort	Yen-Chen Chen
title	Flow coupling between active and passive fluids across water–oil interfaces
title_short	Flow coupling between active and passive fluids across water–oil interfaces
title_full	Flow coupling between active and passive fluids across water–oil interfaces
title_fullStr	Flow coupling between active and passive fluids across water–oil interfaces
title_full_unstemmed	Flow coupling between active and passive fluids across water–oil interfaces
title_sort	flow coupling between active and passive fluids across water–oil interfaces
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/5981bd6349b1423a8e563a1cad557f42
work_keys_str_mv	AT yenchenchen flowcouplingbetweenactiveandpassivefluidsacrosswateroilinterfaces AT brockjolicoeur flowcouplingbetweenactiveandpassivefluidsacrosswateroilinterfaces AT chihchechueh flowcouplingbetweenactiveandpassivefluidsacrosswateroilinterfaces AT kuntawu flowcouplingbetweenactiveandpassivefluidsacrosswateroilinterfaces
_version_	1718377921371963392

Flow coupling between active and passive fluids across water–oil interfaces

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