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Microfluidics and Nanofluidics

, Volume 14, Issue 1–2, pp 153–162 | Cite as

Micro-PIV measurements of induced-charge electro-osmosis around a metal rod

  • Cetin Canpolat
  • Shizhi Qian
  • Ali BeskokEmail author
Research Paper

Abstract

A cylindrical gold-coated stainless steel rod was positioned at the center of a straight microchannel connecting two fluid reservoirs on either end. The microchannel was filled with 1 mM KCl containing 0.5 μm diameter carboxylate-modified spherical particles. Induced-charge electro-osmotic (ICEO) flow occurred around the metallic rod under a sinusoidal AC electric field applied using two platinum electrodes. The ICEO flows around the metallic rod were measured using micro particle image velocimetry (micro-PIV) technique as functions of the AC electric field strength and frequency. The present study provides experimental data about ICEO flow in the weakly nonlinear limit of thin double layers, in which, the charging dynamics of the double layer cannot be presented analytically. The measured ICEO flow pattern qualitatively agrees with the theoretical results obtained by Squires and Bazant (J Fluid Mech 509:217–252, 2004). Flow around the rod is quadrupolar, driving liquid towards the rod along the electric field and forcing it away from the rod in the direction perpendicular to the imposed electric field. The measured ICEO flow velocity is proportional to the square of the electric field strength, and depends on the applied AC frequency.

Keywords

Conductive cylinder Induced-charge electro-osmosis Vortex Micro-PIV 

Notes

Acknowledgments

Canpolat C. acknowledges the financial support of The Scientific and Technological Research Council of Turkey (TUBITAK) for this study.

Supplementary material

10404_2012_1033_MOESM1_ESM.docx (2.5 mb)
Supplementary material 1 (DOCX 2585 kb)

Supplementary material 1 (mpg 1418 kb)

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  1. 1.Institute of Micro and NanotechnologyOld Dominion UniversityNorfolkUSA

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