Nonlinear amplification in electrokinetic pumping in nanochannels in the presence of hydrophobic interactions

Chakraborty, Suman ; Chatterjee, Dipankar ; Bakli, Chirodeep (2013) Nonlinear amplification in electrokinetic pumping in nanochannels in the presence of hydrophobic interactions Physical Review Letters, 110 (18). Article ID 184503. ISSN 0031-9007

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Official URL: http://journals.aps.org/prl/abstract/10.1103/PhysR...

Related URL: http://dx.doi.org/10.1103/PhysRevLett.110.184503

Abstract

We discover a nonlinear coupling between the hydrophobicity of a charged substrate and electrokinetic pumping in narrow fluidic confinements. Our analyses demonstrate that the effective electrokinetic transport in nanochannels may get massively amplified over a regime of bare surface potentials and may subsequently get attenuated beyond a threshold surface charging condition because of a complex interplay between reduced hydrodynamic resistance on account of the spontaneous inception of a less dense interfacial phase and ionic transport within the electrical double layer. We also show that the essential physics delineated by our mesoscopic model, when expressed in terms of a simple mathematical formula, agrees remarkably with that portrayed by molecular dynamics simulations. The nontrivial characteristics of the initial increment followed by a decrement of the effective zeta potential with a bare surface potential may open up the realm of hitherto-unexplored operating regimes of electrohydrodynamically actuated nanofluidic devices.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:100652
Deposited On:06 Jan 2017 10:59
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