Current-Induced Membrane Discharge

Publication: Research - peer-reviewJournal article – Annual report year: 2012

Standard

Current-Induced Membrane Discharge. / Andersen, Mathias Bækbo; van Soestbergen, M.; Mani, A.; Bruus, Henrik; Biesheuvel, P. M.; Bazant, M. Z.

In: Physical Review Letters, Vol. 109, No. 10, 2012, p. Paper 108301.

Publication: Research - peer-reviewJournal article – Annual report year: 2012

Harvard

Andersen, MB, van Soestbergen, M, Mani, A, Bruus, H, Biesheuvel, PM & Bazant, MZ 2012, 'Current-Induced Membrane Discharge' Physical Review Letters, vol 109, no. 10, pp. Paper 108301., 10.1103/PhysRevLett.109.108301

APA

Andersen, M. B., van Soestbergen, M., Mani, A., Bruus, H., Biesheuvel, P. M., & Bazant, M. Z. (2012). Current-Induced Membrane Discharge. Physical Review Letters, 109(10), Paper 108301. 10.1103/PhysRevLett.109.108301

CBE

Andersen MB, van Soestbergen M, Mani A, Bruus H, Biesheuvel PM, Bazant MZ. 2012. Current-Induced Membrane Discharge. Physical Review Letters. 109(10):Paper 108301. Available from: 10.1103/PhysRevLett.109.108301

MLA

Vancouver

Andersen MB, van Soestbergen M, Mani A, Bruus H, Biesheuvel PM, Bazant MZ. Current-Induced Membrane Discharge. Physical Review Letters. 2012;109(10):Paper 108301. Available from: 10.1103/PhysRevLett.109.108301

Author

Andersen, Mathias Bækbo; van Soestbergen, M.; Mani, A.; Bruus, Henrik; Biesheuvel, P. M.; Bazant, M. Z. / Current-Induced Membrane Discharge.

In: Physical Review Letters, Vol. 109, No. 10, 2012, p. Paper 108301.

Publication: Research - peer-reviewJournal article – Annual report year: 2012

Bibtex

@article{6b99db6f5a1f46c790afe7dc70abe565,
title = "Current-Induced Membrane Discharge",
publisher = "American Physical Society",
author = "Andersen, {Mathias Bækbo} and {van Soestbergen}, M. and A. Mani and Henrik Bruus and Biesheuvel, {P. M.} and Bazant, {M. Z.}",
note = "© 2012 American Physical Society",
year = "2012",
doi = "10.1103/PhysRevLett.109.108301",
volume = "109",
number = "10",
pages = "Paper 108301",
journal = "Physical Review Letters",
issn = "0031-9007",

}

RIS

TY - JOUR

T1 - Current-Induced Membrane Discharge

A1 - Andersen,Mathias Bækbo

A1 - van Soestbergen,M.

A1 - Mani,A.

A1 - Bruus,Henrik

A1 - Biesheuvel,P. M.

A1 - Bazant,M. Z.

AU - Andersen,Mathias Bækbo

AU - van Soestbergen,M.

AU - Mani,A.

AU - Bruus,Henrik

AU - Biesheuvel,P. M.

AU - Bazant,M. Z.

PB - American Physical Society

PY - 2012

Y1 - 2012

N2 - Possible 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+ ions, and OH- 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 electroosmotic instability, so it should be reconsidered in both models and experiments on OLC.

AB - Possible 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+ ions, and OH- 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 electroosmotic instability, so it should be reconsidered in both models and experiments on OLC.

UR - http://prl.aps.org/abstract/PRL/v109/i10/e108301

U2 - 10.1103/PhysRevLett.109.108301

DO - 10.1103/PhysRevLett.109.108301

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 10

VL - 109

SP - Paper 108301

ER -