Overlimiting Current in a Microchannel
We revisit the classical problem of diffusion-limited ion transport to a membrane (or electrode) by considering the effects of charged sidewalls. Using simple mathematical models and numerical simulations, we identify three basic mechanisms for overlimiting current in a microchannel: (i) surface con...
| Main Authors: | , , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
American Physical Society (APS)
2012
|
| Online Access: | http://hdl.handle.net/1721.1/68684 |
| _version_ | 1826196797104586752 |
|---|---|
| author | Rubinstein, Isaak Dydek, E. Victoria Zaltzman, Boris Deng, Daosheng Mani, Ali Bazant, Martin Z. |
| author2 | Massachusetts Institute of Technology. Department of Mathematics |
| author_facet | Massachusetts Institute of Technology. Department of Mathematics Rubinstein, Isaak Dydek, E. Victoria Zaltzman, Boris Deng, Daosheng Mani, Ali Bazant, Martin Z. |
| author_sort | Rubinstein, Isaak |
| collection | MIT |
| description | We revisit the classical problem of diffusion-limited ion transport to a membrane (or electrode) by considering the effects of charged sidewalls. Using simple mathematical models and numerical simulations, we identify three basic mechanisms for overlimiting current in a microchannel: (i) surface conduction carried by excess counterions, which dominates for very thin channels, (ii) convection by electro-osmotic flow on the sidewalls, which dominates for thicker channels, and (iii) transitions to electro-osmotic instability on the membrane end in very thick channels. These intriguing electrokinetic phenomena may find applications in biological separations, water desalination, and electrochemical energy storage. |
| first_indexed | 2024-09-23T10:38:09Z |
| format | Article |
| id | mit-1721.1/68684 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:38:09Z |
| publishDate | 2012 |
| publisher | American Physical Society (APS) |
| record_format | dspace |
| spelling | mit-1721.1/686842022-09-30T21:55:52Z Overlimiting Current in a Microchannel Rubinstein, Isaak Dydek, E. Victoria Zaltzman, Boris Deng, Daosheng Mani, Ali Bazant, Martin Z. Massachusetts Institute of Technology. Department of Mathematics Bazant, Martin Z. Dydek, E. Victoria Zaltzman, Boris Deng, Daosheng Mani, Ali Bazant, Martin Z. We revisit the classical problem of diffusion-limited ion transport to a membrane (or electrode) by considering the effects of charged sidewalls. Using simple mathematical models and numerical simulations, we identify three basic mechanisms for overlimiting current in a microchannel: (i) surface conduction carried by excess counterions, which dominates for very thin channels, (ii) convection by electro-osmotic flow on the sidewalls, which dominates for thicker channels, and (iii) transitions to electro-osmotic instability on the membrane end in very thick channels. These intriguing electrokinetic phenomena may find applications in biological separations, water desalination, and electrochemical energy storage. Massachusetts Institute of Technology. Energy Initiative Israel Science Foundation (Grant No. 65/07) 2012-01-27T19:36:35Z 2012-01-27T19:36:35Z 2011-09 2011-02 Article http://purl.org/eprint/type/JournalArticle 0031-9007 1079-7114 http://hdl.handle.net/1721.1/68684 Dydek, E. et al. “Overlimiting Current in a Microchannel.” Physical Review Letters 107.11 (2011): n. pag. Web. 27 Jan. 2012. © 2011 American Physical Society en_US http://dx.doi.org/10.1103/PhysRevLett.107.118301 Physical Review Letters 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/pdf American Physical Society (APS) APS |
| spellingShingle | Rubinstein, Isaak Dydek, E. Victoria Zaltzman, Boris Deng, Daosheng Mani, Ali Bazant, Martin Z. Overlimiting Current in a Microchannel |
| title | Overlimiting Current in a Microchannel |
| title_full | Overlimiting Current in a Microchannel |
| title_fullStr | Overlimiting Current in a Microchannel |
| title_full_unstemmed | Overlimiting Current in a Microchannel |
| title_short | Overlimiting Current in a Microchannel |
| title_sort | overlimiting current in a microchannel |
| url | http://hdl.handle.net/1721.1/68684 |
| work_keys_str_mv | AT rubinsteinisaak overlimitingcurrentinamicrochannel AT dydekevictoria overlimitingcurrentinamicrochannel AT zaltzmanboris overlimitingcurrentinamicrochannel AT dengdaosheng overlimitingcurrentinamicrochannel AT maniali overlimitingcurrentinamicrochannel AT bazantmartinz overlimitingcurrentinamicrochannel |