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

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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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

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