Electroviscous effects in capillary filling of nanochannels

Asger Mortensen, Anders Kristensen

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Resumé

We theoretically examine the widespread hypothesis of an electroviscous origin of the increase in apparent viscosity observed in recent experiments on capillary filling of nanochannels. Including Debye-layer corrections to the hydraulic resistance, we find that the apparent viscosity reaches a maximum in the mesoscopic regime where the channel height (or more generally the hydraulic radius) is comparable to the screening length. However, for realistic estimates of central parameters, we find that the electroviscous contribution to the apparent viscosity is at most a 1% effect.
OriginalsprogEngelsk
TidsskriftApplied Physics Letters
Vol/bind92
Udgave nummer6
Sider (fra-til)063110
ISSN0003-6951
DOI
StatusUdgivet - 2008
Udgivet eksterntJa

Fingeraftryk

viscosity
hydraulics
screening
radii
estimates

Bibliografisk note

Copyright (2008) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

Citer dette

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Electroviscous effects in capillary filling of nanochannels. / Mortensen, Asger; Kristensen, Anders.

I: Applied Physics Letters, Bind 92, Nr. 6, 2008, s. 063110.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Electroviscous effects in capillary filling of nanochannels

AU - Mortensen, Asger

AU - Kristensen, Anders

N1 - Copyright (2008) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

PY - 2008

Y1 - 2008

N2 - We theoretically examine the widespread hypothesis of an electroviscous origin of the increase in apparent viscosity observed in recent experiments on capillary filling of nanochannels. Including Debye-layer corrections to the hydraulic resistance, we find that the apparent viscosity reaches a maximum in the mesoscopic regime where the channel height (or more generally the hydraulic radius) is comparable to the screening length. However, for realistic estimates of central parameters, we find that the electroviscous contribution to the apparent viscosity is at most a 1% effect.

AB - We theoretically examine the widespread hypothesis of an electroviscous origin of the increase in apparent viscosity observed in recent experiments on capillary filling of nanochannels. Including Debye-layer corrections to the hydraulic resistance, we find that the apparent viscosity reaches a maximum in the mesoscopic regime where the channel height (or more generally the hydraulic radius) is comparable to the screening length. However, for realistic estimates of central parameters, we find that the electroviscous contribution to the apparent viscosity is at most a 1% effect.

U2 - 10.1063/1.2857470

DO - 10.1063/1.2857470

M3 - Journal article

VL - 92

SP - 063110

JO - Applied Physics Letters

JF - Applied Physics Letters

SN - 0003-6951

IS - 6

ER -