Nonlinear ion transport mediated by induced charge in ultrathin nanoporous membranes
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, we demonstrate how induced charge at membrane interfaces can lead to non...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society (APS)
2022
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| Online Access: | https://hdl.handle.net/1721.1/138832.2 |
| _version_ | 1811097464728453120 |
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| author | de Souza, J Pedro Chow, Chun-Man Karnik, Rohit Bazant, Martin Z |
| author2 | Massachusetts Institute of Technology. Department of Chemical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Chemical Engineering de Souza, J Pedro Chow, Chun-Man Karnik, Rohit Bazant, Martin Z |
| author_sort | de Souza, J Pedro |
| collection | MIT |
| description | 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, 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 MoS_{2} membranes in an electric field. We expect the role of induced charge to be especially pronounced in the limit of atomically thin membranes. |
| first_indexed | 2024-09-23T16:59:58Z |
| format | Article |
| id | mit-1721.1/138832.2 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T16:59:58Z |
| publishDate | 2022 |
| publisher | American Physical Society (APS) |
| record_format | dspace |
| spelling | mit-1721.1/138832.22022-01-05T19:30:00Z Nonlinear ion transport mediated by induced charge in ultrathin nanoporous membranes de Souza, J Pedro Chow, Chun-Man Karnik, Rohit Bazant, Martin Z Massachusetts Institute of Technology. Department of Chemical Engineering Massachusetts Institute of Technology. Department of Mechanical Engineering Massachusetts Institute of Technology. Department of Mathematics 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, 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 MoS_{2} membranes in an electric field. We expect the role of induced charge to be especially pronounced in the limit of atomically thin membranes. U.S. Department of Energy, Office of Science, Basic Energy Sciences (Award DE-SC0019112) National Science Foundation (Awards 1122374, 1745302) 2022-01-05T19:29:59Z 2022-01-05T19:19:00Z 2022-01-05T19:29:59Z 2021-10 2022-01-05T19:15:31Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/138832.2 de Souza, J Pedro, Chow, Chun-Man, Karnik, Rohit and Bazant, Martin Z. 2021. "Nonlinear ion transport mediated by induced charge in ultrathin nanoporous membranes." Physical Review E, 104 (4). en 10.1103/physreve.104.044802 Physical Review E Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/octet-stream American Physical Society (APS) APS |
| spellingShingle | de Souza, J Pedro Chow, Chun-Man Karnik, Rohit Bazant, Martin Z Nonlinear ion transport mediated by induced charge in ultrathin nanoporous membranes |
| title | Nonlinear ion transport mediated by induced charge in ultrathin nanoporous membranes |
| title_full | Nonlinear ion transport mediated by induced charge in ultrathin nanoporous membranes |
| title_fullStr | Nonlinear ion transport mediated by induced charge in ultrathin nanoporous membranes |
| title_full_unstemmed | Nonlinear ion transport mediated by induced charge in ultrathin nanoporous membranes |
| title_short | Nonlinear ion transport mediated by induced charge in ultrathin nanoporous membranes |
| title_sort | nonlinear ion transport mediated by induced charge in ultrathin nanoporous membranes |
| url | https://hdl.handle.net/1721.1/138832.2 |
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