title: Induced-charge electrokinetics, bipolar current, and concentration polarization in a microchannel-Nafion-membrane system.
abstract: The presence of a floating electrode array located within the depletion layer formed due to concentration polarization across a microchannel-membrane interface device may produce not only induced-charge electro-osmosis (ICEO) but also bipolar current resulting from the induced Faradaic reaction. It has been shown that there exists an optimal thickness of a thin dielectric coating that is sufficient to suppress bipolar currents but still enables ICEO vortices that stir the depletion layer, thereby affecting the system's current-voltage response. In addition, the use of alternating-current electro-osmosis by activating electrodes results in further enhancement of the fluid stirring and opens new routes for on-demand spatiotemporal control of the depletion layer length.
authors.affiliation: Micro- and Nanofluidics Laboratory, Faculty of Mechanical Engineering, Technion-Israel Institute of Technology, Technion City 32000, Israel.
authors.forename: Sinwook
authors.initials: S
authors.lastname: Park
authors.affiliation: Micro- and Nanofluidics Laboratory, Faculty of Mechanical Engineering, Technion-Israel Institute of Technology, Technion City 32000, Israel.
authors.forename: Gilad
authors.initials: G
authors.lastname: Yossifon