The University of Southampton
University of Southampton Institutional Repository

Flow Reversal in Traveling-Wave Electrokinetics: An Analysis of Forces Due to Ionic Concentration Gradients

Record type: Article

Pumping of electrolytes using ac electric fields from arrays of microelectrodes is a subject of current research. The behavior of fluids at low signal amplitudes (< 2-3 V-pp) is in qualitative agreement with the prediction of the ac electroosmosis theory. At higher voltages, this theory cannot account for the experimental observations. In some cases, net pumping is generated in the direction opposite to that predicted by the theory (flow reversal). In this work, we use fluorescent dyes to study the effect of ionic concentration gradients generated by Faradaic currents. We also evaluate the influence of factors such as the channel height and microelectrode array shape in the pumping of electrolytes with traveling-wave potentials. Induced charge beyond the Debye length is postulated to be responsible for the forces generating the observed flows at higher voltages. Numerical calculations are performed in order to illustrate the mechanisms that might be responsible for generating the flow.

PDF la803651e.pdf - Other
Download (975kB)

Citation

Garcia-Sanchez, Pablo, Ramos, Antonio, Gonzalez, Antonio, Green, Nicolas G and Morgan, Hywel (2009) Flow Reversal in Traveling-Wave Electrokinetics: An Analysis of Forces Due to Ionic Concentration Gradients Langmuir, 25, (9), pp. 4988-4997. (doi:10.1021/la803651e).

More information

Published date: 2009
Additional Information: Imported from ISI Web of Science
Organisations: Electronics & Computer Science

Identifiers

Local EPrints ID: 270024
URI: http://eprints.soton.ac.uk/id/eprint/270024
ISSN: 0743-7463
PURE UUID: b0221ae9-825f-451f-b78d-2db289572e5b
ORCID for Nicolas G Green: ORCID iD orcid.org/0000-0001-9230-4455
ORCID for Hywel Morgan: ORCID iD orcid.org/0000-0003-4850-5676

Catalogue record

Date deposited: 21 Apr 2010 07:46
Last modified: 18 Jul 2017 06:51

Export record

Altmetrics

Contributors

Author: Pablo Garcia-Sanchez
Author: Antonio Ramos
Author: Antonio Gonzalez
Author: Nicolas G Green ORCID iD
Author: Hywel Morgan ORCID iD

University divisions


Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×