Experimental observation of flow fields around active Janus spheres

Abstract

The phoretic mechanisms at stake in the propulsion of asymmetric colloids have been the subject of debates during the past years. In particular, the importance of electrokinetic effects on the motility of Pt-PS Janus sphere was recently discussed. Here, we probe the hydrodynamic flow field around a catalytically active colloid using particle tracking velocimetry both in the freely swimming state and when kept stationary with an external force. Our measurements provide information about the fluid velocity in the vicinity of the surface of the colloid, and confirm a mechanism for propulsion that was proposed recently. In addition to offering a unified understanding of the nonequilibrium interfacial transport processes at stake, our results open the way to a thorough description of the hydrodynamic interactions between such active particles and understanding their collective dynamics.

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Item Type:	Article
Authors/Creators:	Campbell, A.I. Ebbens, S.J. https://orcid.org/0000-0002-4727-4426 Illien, P. Golestanian, R.
Copyright, Publisher and Additional Information:	© The Author(s) 2019. Open Access: This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Keywords:	Soft Condensed Matter (cond-mat.soft); Fluid Dynamics (physics.flu-dyn)
Dates:	Accepted: 30 July 2019 Published (online): 2 September 2019 Published: 2 September 2019
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Chemical and Biological Engineering (Sheffield)
Funding Information:	Funder Grant number ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/J002402/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/N033736/1
Depositing User:	Symplectic Sheffield
Date Deposited:	16 Feb 2018 16:06
Last Modified:	23 Jul 2020 08:13
Status:	Published
Publisher:	Nature Research
Refereed:	Yes
Identification Number:	10.1038/s41467-019-11842-1
Related URLs:	arXiv URL
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:127544

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Experimental observation of flow fields around active Janus spheres

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