The University of Southampton
University of Southampton Institutional Repository

Traveling-wave electrokinetic micropumps: velocity, electrical current, and impedance measurements

Traveling-wave electrokinetic micropumps: velocity, electrical current, and impedance measurements
Traveling-wave electrokinetic micropumps: velocity, electrical current, and impedance measurements
An array of microelectrodes covered in an electrolyte and energized by a traveling-wave potential produces net movement of the fluid. Arrays of platinum microelectrodes of two different characteristic sizes have been studied. For both sizes of arrays, at low voltages (<2 V-pp) the electrolyte flow is in qualitative agreement with the linear theory of ac electroosmosis. At voltages above a threshold, the direction of fluid flow is reversed. The electrical impedance of the electrode - electrolyte system was measured after the experiments, and changes in the electrical properties of the electrolyte were observed. Measurements of the electrical current during pumping of the electrolyte are also reported. Transient behaviors in both electrical current and fluid velocity were observed. The Faradaic currents probably generate conductivity gradients in the liquid bulk, which in turn give rise to electrical forces. These effects are discussed in relation to the fluid flow observations.
0743-7463
9361-9369
Garcia-Sanchez, Pablo
9f2b8e4f-0c15-4cff-9f3b-91ce213c4ca5
Ramos, Antonio
511ab594-f312-45ce-b7ff-ef348fd9b559
Green, Nicolas G
d9b47269-c426-41fd-a41d-5f4579faa581
Morgan, Hywel
de00d59f-a5a2-48c4-a99a-1d5dd7854174
Garcia-Sanchez, Pablo
9f2b8e4f-0c15-4cff-9f3b-91ce213c4ca5
Ramos, Antonio
511ab594-f312-45ce-b7ff-ef348fd9b559
Green, Nicolas G
d9b47269-c426-41fd-a41d-5f4579faa581
Morgan, Hywel
de00d59f-a5a2-48c4-a99a-1d5dd7854174

Garcia-Sanchez, Pablo, Ramos, Antonio, Green, Nicolas G and Morgan, Hywel (2008) Traveling-wave electrokinetic micropumps: velocity, electrical current, and impedance measurements. Langmuir, 24 (17), 9361-9369. (doi:10.1021/la800423k).

Record type: Article

Abstract

An array of microelectrodes covered in an electrolyte and energized by a traveling-wave potential produces net movement of the fluid. Arrays of platinum microelectrodes of two different characteristic sizes have been studied. For both sizes of arrays, at low voltages (<2 V-pp) the electrolyte flow is in qualitative agreement with the linear theory of ac electroosmosis. At voltages above a threshold, the direction of fluid flow is reversed. The electrical impedance of the electrode - electrolyte system was measured after the experiments, and changes in the electrical properties of the electrolyte were observed. Measurements of the electrical current during pumping of the electrolyte are also reported. Transient behaviors in both electrical current and fluid velocity were observed. The Faradaic currents probably generate conductivity gradients in the liquid bulk, which in turn give rise to electrical forces. These effects are discussed in relation to the fluid flow observations.

Text
J47_Garcia-Sanchez_Ramos_Green_Morgan_Langmuir_2008.pdf - Other
Download (648kB)

More information

Published date: 2 August 2008
Organisations: Electronics & Computer Science

Identifiers

Local EPrints ID: 269448
URI: https://eprints.soton.ac.uk/id/eprint/269448
ISSN: 0743-7463
PURE UUID: 19d45930-e277-4d39-9e1b-85503daa88d3
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: 29 Aug 2019 00:44

Export record

Altmetrics

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 https://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.

×