Theory of Ion and Water Transport in Electron-Conducting Membrane Pores with pH-Dependent Chemical Charge
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URI (для ссылок/цитирований):
https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.12.014039https://elib.sfu-kras.ru/handle/2311/129468
Автор:
Zhang, L.
Biesheuvel, P. M.
Ryzhkov, I. I.
Коллективный автор:
Институт космических и информационных технологий
Кафедра прикладной математики и компьютерной безопасности
Дата:
2019-07Журнал:
Physical Review AppliedКвартиль журнала в Scopus:
Q1Квартиль журнала в Web of Science:
Q1Библиографическое описание:
Zhang, L. Theory of Ion and Water Transport in Electron-Conducting Membrane Pores with pH-Dependent Chemical Charge [Текст] / L. Zhang, P. M. Biesheuvel, I. I. Ryzhkov // Physical Review Applied. — 2019. — Т. 12. — С. 014039Аннотация:
In this work, we develop an extended uniform potential (UP) model for a membrane nanopore by
including two different charging mechanisms of the pore walls, namely by electronic charge and by chemical
charge. These two charging mechanisms generally occur in polymeric membranes with conducting
agents, or membranes made of conducting materials like carbon nanotubes with surface ionizable groups.
The electronic charge redistributes along the pore in response to the gradient of electric potential in the
pore, while the chemical charge depends on the local pH via a Langmuir-type isotherm. The extended UP
model shows good agreement with experimental data for membrane potential measured at the zero-current
condition. When both types of charge are present, the ratio of the electronic charge to the chemical charge
can be characterized by the dimensionless number of surface groups and the dimensionless capacitance
of the dielectric Stern layer. The performance of the membrane pore in converting osmotic energy from a
salt concentration difference into electrical power can be improved by tuning the electronic charge.