Nonlinear ion transport mediated by induced charge in ultrathin nanoporous membranes
Abstract
Ultrathin membranes with nanoporous conduits show promise for ionic separations and desalination applications, but the mechanisms underlying the nonlinear ionic transport observed in these systems are not well understood. Here, in this work, we demonstrate how induced charge at membrane interfaces can lead to nonlinear ionic transport and voltage-dependent conductance through such channels. The application of an electric field on a polarizable membrane leads to induced charges at the membrane interfaces. The induced charges in turn are screened by diffuse charges in the electrolyte, which are acted upon by the electric field. For extremely thin membranes, the induced charge effect can be significant even for moderate applied voltages commonly used in experiments. We apply a continuum Poisson-Nernst-Planck model to characterize the current-voltage behavior of ultrathin membranes over a wide parameter space. The predictions of the model are compared to recent experiments on graphene and MoS2 membranes in an electric field. We expect the role of induced charge to be especially pronounced in the limit of atomically thin membranes.
- Publication Date:
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1980195
- Grant/Contract Number:
- SC0019112; 1122374; 1745302
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. E
- Additional Journal Information:
- Journal Volume: 104; Journal Issue: 4; Journal ID: ISSN 2470-0045
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; capacitance; dielectric properties; electrical conductivity; electrochemical properties; ionic transport; graphene
Citation Formats
de Souza, J. Pedro, Chow, Chun-Man, Karnik, Rohit, and Bazant, Martin Z. Nonlinear ion transport mediated by induced charge in ultrathin nanoporous membranes. United States: N. p., 2021.
Web. doi:10.1103/physreve.104.044802.
de Souza, J. Pedro, Chow, Chun-Man, Karnik, Rohit, & Bazant, Martin Z. Nonlinear ion transport mediated by induced charge in ultrathin nanoporous membranes. United States. https://doi.org/10.1103/physreve.104.044802
de Souza, J. Pedro, Chow, Chun-Man, Karnik, Rohit, and Bazant, Martin Z. Tue .
"Nonlinear ion transport mediated by induced charge in ultrathin nanoporous membranes". United States. https://doi.org/10.1103/physreve.104.044802. https://www.osti.gov/servlets/purl/1980195.
@article{osti_1980195,
title = {Nonlinear ion transport mediated by induced charge in ultrathin nanoporous membranes},
author = {de Souza, J. Pedro and Chow, Chun-Man and Karnik, Rohit and Bazant, Martin Z.},
abstractNote = {Ultrathin membranes with nanoporous conduits show promise for ionic separations and desalination applications, but the mechanisms underlying the nonlinear ionic transport observed in these systems are not well understood. Here, in this work, we demonstrate how induced charge at membrane interfaces can lead to nonlinear ionic transport and voltage-dependent conductance through such channels. The application of an electric field on a polarizable membrane leads to induced charges at the membrane interfaces. The induced charges in turn are screened by diffuse charges in the electrolyte, which are acted upon by the electric field. For extremely thin membranes, the induced charge effect can be significant even for moderate applied voltages commonly used in experiments. We apply a continuum Poisson-Nernst-Planck model to characterize the current-voltage behavior of ultrathin membranes over a wide parameter space. The predictions of the model are compared to recent experiments on graphene and MoS2 membranes in an electric field. We expect the role of induced charge to be especially pronounced in the limit of atomically thin membranes.},
doi = {10.1103/physreve.104.044802},
journal = {Physical Review. E},
number = 4,
volume = 104,
place = {United States},
year = {Tue Oct 26 00:00:00 EDT 2021},
month = {Tue Oct 26 00:00:00 EDT 2021}
}
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