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Stationary electro-osmotic flow driven by AC fields around charged dielectric spheres

Stationary electro-osmotic flow driven by AC fields around charged dielectric spheres
Stationary electro-osmotic flow driven by AC fields around charged dielectric spheres
We experimentally demonstrate quadrupolar electro-osmotic flows around charged dielectric microspheres immersed in an electrolyte when subjected to an alternating current electric field. We present an electrokinetic model that predicts the flow characteristics based on the phenomena of surface conductance and polarization of the electrolyte concentration around the particles. We refer to these flows as concentration polarization electro-osmosis. We anticipate that these flows may play a major role in the electric-field-induced assembly of colloids and on the electrokinetic manipulation of dielectric micro- and nanoparticles.
colloids, electrokinetic flows
0022-1120
Fernández-Mateo, Raúl
f287538e-c53c-4208-b8bf-945b0966fd5f
García-Sánchez, Pablo
11cec08e-0384-4ef6-a1b3-183c9b32c4ea
Calero, Víctor
4c270680-a83d-4c15-9cc6-df3fd34b79df
Morgan, Hywel
de00d59f-a5a2-48c4-a99a-1d5dd7854174
Ramos, Antonio
79d60433-0c6b-4eaa-80ac-e2f61e704f72
Fernández-Mateo, Raúl
f287538e-c53c-4208-b8bf-945b0966fd5f
García-Sánchez, Pablo
11cec08e-0384-4ef6-a1b3-183c9b32c4ea
Calero, Víctor
4c270680-a83d-4c15-9cc6-df3fd34b79df
Morgan, Hywel
de00d59f-a5a2-48c4-a99a-1d5dd7854174
Ramos, Antonio
79d60433-0c6b-4eaa-80ac-e2f61e704f72

Fernández-Mateo, Raúl, García-Sánchez, Pablo, Calero, Víctor, Morgan, Hywel and Ramos, Antonio (2021) Stationary electro-osmotic flow driven by AC fields around charged dielectric spheres. Journal of Fluid Mechanics, 924 (R2), [650]. (doi:10.1017/jfm.2021.650).

Record type: Article

Abstract

We experimentally demonstrate quadrupolar electro-osmotic flows around charged dielectric microspheres immersed in an electrolyte when subjected to an alternating current electric field. We present an electrokinetic model that predicts the flow characteristics based on the phenomena of surface conductance and polarization of the electrolyte concentration around the particles. We refer to these flows as concentration polarization electro-osmosis. We anticipate that these flows may play a major role in the electric-field-induced assembly of colloids and on the electrokinetic manipulation of dielectric micro- and nanoparticles.

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More information

Published date: 11 August 2021
Additional Information: Funding Information: P.G.-S. and A.R. acknowledge financial support from the European Regional Development Fund and the Spanish State Research Agency (MCI) under contract PGC2018-099217-B-I00. Publisher Copyright: © Copyright: Copyright 2021 Elsevier B.V., All rights reserved.
Keywords: colloids, electrokinetic flows

Identifiers

Local EPrints ID: 450973
URI: http://eprints.soton.ac.uk/id/eprint/450973
ISSN: 0022-1120
PURE UUID: 76b0711a-a3bd-41e3-9a2d-365270810748
ORCID for Raúl Fernández-Mateo: ORCID iD orcid.org/0000-0003-1413-8046
ORCID for Hywel Morgan: ORCID iD orcid.org/0000-0003-4850-5676

Catalogue record

Date deposited: 27 Aug 2021 16:33
Last modified: 26 Nov 2021 03:21

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Contributors

Author: Raúl Fernández-Mateo ORCID iD
Author: Pablo García-Sánchez
Author: Víctor Calero
Author: Hywel Morgan ORCID iD
Author: Antonio Ramos

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