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Updated: Jul 31, 2026

AC Electrokinetic Phenomena Generated by Microelectrode Structures
Published on: July 28, 2008
Possibility of Obtaining Two Orders of Magnitude Larger Electrokinetic Streaming Potentials, through Liquid
Bei Fan1, Prabhakar R Bandaru1
1Program in Materials Science, Department of Mechanical & Aerospace Engineering, University of California-San Diego, La Jolla, California 92093, United States.
Abstract:
It is shown that the magnitude of the streaming potential (Vs) can be significantly enhanced from ∼0.02 V to as much as ∼1.6 V, in electrokinetic flows through microchannels. This was done through flows on liquid-filled surfaces, where the grooves were filled with oils of viscosity in the range 30-3000 mPa·s. The presence of immiscible oils and the improved slip are both factors that could significantly increase the Vs. The analytical relationship between streaming potential and filled liquid viscosity was derived and verified through corresponding experimental results. The work yields novel insights into complex electrolyte flows and indicates avenues for more efficient energy harvesting.
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