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Published on: January 26, 2016
Modulation of the Streaming Potential and Slip Characteristics in Electrolyte Flow over Liquid-Filled Surfaces
Bei Fan1, Prabhakar R Bandaru1
1Department of Mechanical Engineering , University of California, San Diego , La Jolla , California 92093 , United States.
Abstract:
A significant enhancement in the streaming potential ( Vs) was obtained in experiments considering the flow of electrolyte over liquid-filled surfaces (LFSs), where the grooves in patterned substrates are filled with electrolyte immiscible oils. Such LFSs yield larger Vs (by a factor of 1.5) compared to superhydrophobic surfaces, with air-filled grooves, and offer tunability of electrokinetic flow. It is shown that the density, viscosity, conductivity, as well as the dielectric constant of the filling oil, in the LFS, determine Vs. Relating a hydrodynamic slip length to the obtained Vs offers insight into flow characteristics, as modulated by the liquid interfaces in the LFS.
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