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Theoretical Study of Electrolyte Diffusion through Polarizable Nanopores

Authors: Ilya I. Ryzhkov; Anton S. Vyatkin; Andrey V. Minakov;

Theoretical Study of Electrolyte Diffusion through Polarizable Nanopores

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.

Проведено теоретическое исследование диффузии бинарных электролитов через нанопоры с диэлектрической, а также проводящей поверхностью на основе модели пространственного заряда. Данная модель обобщена на случай поляризумой стенки поры с постоянным потенциалом. Показано, что диффузия ионов с различными подвижностями приводит к возникновению электрического поля, которое индуцирует неравномерное распределение заряда на поверхности проводящей поры. Это вызывает разделение заряда внутри поры и приводит к значительному увеличению мембранного потенциала по сравнению со случаем диэлектрической поры. Проведены расчеты для трех типов водных электролитов на основе KCl, NaCl и LiOH. Исследовано влияние типа электролита и трансмембранной разности концентраций на перенос ионов и мембранный потенциал.

Country
Russian Federation
Related Organizations
Keywords

diffusion, electric double layer, electrolyte transport, numerical modelling, induced charge, диффузия, 530, 620, нанопористая мембрана, 29.19.22, перенос электролита, двойной электрический слой, индуцированный заряд, membrane potential, мембранный потенциал, nanoporous membrane, численное моделирование

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
3
Average
Average
Average
gold