Induced-Charge Enhancement of the Diffusion Potential in Membranes with Polarizable Nanopores

I. I. Ryzhkov, D. V. Lebedev, V. S. Solodovnichenko, A. V. Shiverskiy, M. M. Simunin

Research output

10 Citations (Scopus)

Abstract

When a charged membrane separates two salt solutions of different concentrations, a potential difference appears due to interfacial Donnan equilibrium and the diffusion junction. Here, we report a new mechanism for the generation of a membrane potential in polarizable conductive membranes via an induced surface charge. It results from an electric field generated by the diffusion of ions with different mobilities. For uncharged membranes, this effect strongly enhances the diffusion potential and makes it highly sensitive to the ion mobilities ratio, electrolyte concentration, and pore size. Theoretical predictions on the basis of the space-charge model extended to polarizable nanopores fully agree with experimental measurements in KCl and NaCl aqueous solutions.

Original languageEnglish
Article number226001
JournalPhysical Review Letters
Volume119
Issue number22
DOIs
Publication statusPublished - 29 Nov 2017
Externally publishedYes

Scopus subject areas

  • Physics and Astronomy(all)

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