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dc.contributor.authorAndersen, M. B.
dc.contributor.authorvan Soestbergen, M.
dc.contributor.authorMani, Ali
dc.contributor.authorBruus, Henrik
dc.contributor.authorBiesheuvel, P. M.
dc.date.accessioned2012-10-18T14:52:13Z
dc.date.available2012-10-18T14:52:13Z
dc.date.issued2012-09
dc.date.submitted2012-02
dc.identifier.issn0031-9007
dc.identifier.issn1079-7114
dc.identifier.urihttp://hdl.handle.net/1721.1/74073
dc.description.abstractPossible mechanisms for overlimiting current (OLC) through aqueous ion-exchange membranes (exceeding diffusion limitation) have been debated for half a century. Flows consistent with electro-osmotic instability have recently been observed in microfluidic experiments, but the existing theory neglects chemical effects and remains to be quantitatively tested. Here, we show that charge regulation and water self-ionization can lead to OLC by “current-induced membrane discharge” (CIMD), even in the absence of fluid flow, in ion-exchange membranes much thicker than the local Debye screening length. Salt depletion leads to a large electric field resulting in a local pH shift within the membrane with the effect that the membrane discharges and loses its ion selectivity. Since salt co-ions, H[superscript +] ions, and OH[superscript -] ions contribute to OLC, CIMD interferes with electrodialysis (salt counterion removal) but could be exploited for current-assisted ion exchange and pH control. CIMD also suppresses the extended space charge that leads to electro-osmotic instability, so it should be reconsidered in both models and experiments on OLC.en_US
dc.language.isoen_US
dc.publisherAmerican Physical Societyen_US
dc.relation.isversionofhttp://dx.doi.org/10.1103/PhysRevLett.109.108301en_US
dc.rightsArticle 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.en_US
dc.sourceAPSen_US
dc.titleCurrent-Induced Membrane Dischargeen_US
dc.typeArticleen_US
dc.identifier.citationAndersen, M. et al. “Current-Induced Membrane Discharge.” Physical Review Letters 109.10 (2012) © 2012 American Physical Societyen_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Chemical Engineeringen_US
dc.contributor.mitauthorBiesheuvel, P. M.
dc.relation.journalPhysical Review Lettersen_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dspace.orderedauthorsAndersen, M.; van Soestbergen, M.; Mani, A.; Bruus, H.; Biesheuvel, P.; Bazant, M.en
mit.licensePUBLISHER_POLICYen_US
mit.metadata.statusComplete


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