Journal of Siberian Federal University. Mathematics & Physics / Theoretical Study of Electrolyte Diffusion through Polarizable Nanopores

Full text (.pdf)
Issue
Journal of Siberian Federal University. Mathematics & Physics. 2018 11 (4)
Authors
Ryzhkov, Ilya I.; Vyatkin, Anton S.; Minakov, Andrey V.
Contact information
Ryzhkov, Ilya I.: Institute of Computational Modelling SB RAS Academgorodok, 50/44 Krasnoyarsk, 660036 Siberian Federal University Svobodny, 79, Krasnoyarsk, 660041 Russia; ; Vyatkin, Anton S.: Institute of Computational Modelling SB RAS Academgorodok, 50/44 Krasnoyarsk, 660036 Siberian Federal University Svobodny, 79, Krasnoyarsk, 660041 Russia; ; Minakov, Andrey V.: Institute of Engineering Physics and Radio Electronics Siberian Federal University Svobodny, 79, Krasnoyarsk, 660041 Russia;
Keywords
nanoporous membrane; electrolyte transport; diffusion; induced charge; electric double layer; membrane potential; numerical modelling
Abstract

The diffusion of binary aqueous electrolytes through nanopores with dielectric as well as conductive surface is investigated theoretically on the basis of Space–Charge model. The latter is extended to the case of polarizable nanopore wall. It is shown that the diffusion of ions with different mobilities generates the electric field, which induces non–uniform surface charge in a polarizable nanopore. It results in charge separation inside the pore and leads to a dramatic enhancement of membrane potential in comparison with a non–polarizable nanopore. The calculations are performed for three aqueous electrolytes based on KCl, NaCl, and LiOH. The influence of electrolyte type and concentration difference applied across the pore on the ion transport and membrane potential is discussed and analyzed.

Pages
494–504
Paper at repository of SibFU
https://elib.sfu-kras.ru/handle/2311/71754