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Induced-charge electro-osmosis of polymer-containing fluid around a metallic rod

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Abstract

Induced-charge electro-osmotic (ICEO) flow of polymer-containing electrolyte solution around a cylindrical gold-coated stainless steel rod under AC electric field is measured by micro-particle image velocimetry (micro-PIV) for the first time. The ICEO flows as functions of the amount of non-ionic PEG (polyethylene glycol), cationic PDADMA (polydiallyldimethylammonium chloride), and anionic PVSASS (polyvinylsulfonic acid sodium salt) polymers added into the salt solution, frequency, and strength of the AC electric field are measured. The ICEO flow of polymer-containing fluid around the rod is quadrupolar with four vortices and is proportional to the square of imposed electric field. The ICEO flow velocity exponentially decreases with an increased concentration of neutral PEG. Ionic polyelectrolytes significantly increase ICEO velocities due to the enriched net charge within the induced electric double layer arising from the electrostatic interaction between the polarized rod’s surface and the charged polyelectrolytes in ionic polymer solution. In addition, polymer concentration affects the dependence of the ICEO flow on the frequency of AC electric field.

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Acknowledgments

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

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  1. Institute of Micro and Nanotechnology, Old Dominion University, Norfolk, VA, 23529, USA

    Cetin Canpolat, Shizhi Qian & Ali Beskok

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  1. Cetin Canpolat
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  2. Shizhi Qian
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  3. Ali Beskok
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Correspondence to Ali Beskok.

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Canpolat, C., Qian, S. & Beskok, A. Induced-charge electro-osmosis of polymer-containing fluid around a metallic rod. Microfluid Nanofluid 16, 247–255 (2014). https://doi.org/10.1007/s10404-013-1204-y

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  • DOI: https://doi.org/10.1007/s10404-013-1204-y

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