Controlling AC-Electroosmotic vortex flows by shaping the channel cross section

Christina Tiflidis, Eiko Westerbeek, Koen Jorissen, Wouter Olthuis, Jan Eijkel, Wim De Malsche

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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Abstract

This work demonstrates the ability to control lateral AC-electroosmotic flow (AC-EOF) by changing channel wall shapes. AC-EOF is generated by a tangential E-field component at the electrodes, causing a Coulomb force on the ions in the electrode double layers. When the electrode polarity changes, both E-field and ionic charge change polarity, maintaining a constant direction of AC-EOF. Classically, AC-EOF is generated by shaping the electrode geometry [1,2]. However, AC-EOF is also generated for example when a dielectric particle levitates above an electrode surface, causing locally curved E-field lines [3,4,5,6]. Here we show that a similar phenomenon occurs when field lines are shaped by nonconducting walls. We designed channels with electrodes at top and bottom and variously shaped insulating side walls and show we can create differently shaped vortices.
Original languageEnglish
Title of host publication24th International Conference on Miniaturized Systems for Chemistry and Life Sciences (MicroTAS 2020)
Subtitle of host publicationProceedings of a meeting held 4-9 October 2020, Online
PublisherThe Chemical and Biological Microsystems Society
Pages38-39
Number of pages2
ISBN (Print)978-1-7334190-1-7, 978-1-7138212-3-6 (Set)
Publication statusPublished - 9 Oct 2020
Event24th International Conference on Miniaturized Systems for Chemistry and Life Sciences, µTAS 2020 - Virtual Event
Duration: 4 Oct 20209 Oct 2020
Conference number: 24
https://microtas2020.org/

Conference

Conference24th International Conference on Miniaturized Systems for Chemistry and Life Sciences, µTAS 2020
Abbreviated titleMicroTAS 2020
CityVirtual Event
Period4/10/209/10/20
Internet address

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