Direct observation of nonequilibrium electroosmotic instability

S.M. Rubinstein, G. Manukyan, A.D. Staicu, I. Rubinstein, B. Zaltzman, Rob G.H. Lammertink, Friedrich Gunther Mugele, Matthias Wessling

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Abstract

We present a visualization of the predicted instability in ionic conduction from a binary electrolyte into a charge selective solid. This instability develops when a voltage greater than critical is applied to a thin layer of copper sulfate flanked by a copper anode and a cation selective membrane. The current-voltage dependence exhibits a saturation at the limiting current. With a further increase of voltage, the current increases, marking the transition to the overlimiting conductance. This transition is mediated by the appearing vortical flow that increases with the applied voltage.
Original languageUndefined
Pages (from-to)-
JournalPhysical review letters
Volume101
Issue number23
DOIs
Publication statusPublished - 2008

Keywords

  • METIS-250561
  • IR-61198

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