Electro-viscous effects in capillary filling of nanochannels

Details Electro-viscous effects in capillary filling of nanochannels Electro-viscous effects in capillary filling of nanochannels

2008-02-14

arxiv.org/abs/0802.1967v1

Appl. Phys. Lett. 92, 063110 (2008)

Physics

Fluid Dynamics

Scientific paper

10.1063/1.2857470

We theoretically examine the widespread hypothesis of an electro-viscous 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 electro-viscous contribution to the apparent viscosity is at most a 1% effect.

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