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

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.

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.

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


Local EPrints ID: 270024
ISSN: 0743-7463
PURE UUID: b0221ae9-825f-451f-b78d-2db289572e5b
ORCID for Nicolas G Green: ORCID iD
ORCID for Hywel Morgan: ORCID iD

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Date deposited: 21 Apr 2010 07:46
Last modified: 05 Oct 2017 07:57

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

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