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arXiv · 1503.08957

Time-dependent ion transport in heterogeneous permselective systems

Yoav Green·Gilad Yossifon
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Abstract

The current study extends previous analytical and numerical solutions of chronopotentiometric response of one-dimensional systems consisting of three layers to the more realistic two-dimensional heterogeneous ion-permselective medium. An analytical solution for the transient concentration-polarization problem, under the local electro-neutrality approximation and ideal permselectivity, was obtained using the Laplace transform and separation of variables. Then the two-dimensional electric potential was obtained numerically and was compared to the full Poisson-Nernst-Planck solution. It was then shown that the resultant voltage drop across the system varies between the initial Ohmic response and that of the steady-state accounting for concentration-polarization. Also, field-focusing effect in a two-dimensional system is shown to result in a faster depletion of ions at the permselective interface.

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Yoav Green, Gilad Yossifon. 2015-03-31. Time-dependent ion transport in heterogeneous permselective systems. https://doi.org/10.1103/physreve.91.063001

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