Electrokinetics at aqueous interfaces without mobile charges

Langmuir : the ACS Journal of Surfaces and Colloids
Douwe Jan BonthuisRoland R Netz

Abstract

We theoretically consider the possibility of using electric fields in aqueous channels of cylindrical and planar geometry to induce transport in the absence of mobile ionic charges. Using the Navier-Stokes equation, generalized to include the effects of water spinning, dipole orientation and relaxation, we show analytically that pumping of a dipolar liquid through an uncharged hydrophobic channel can be achieved by injecting torque into the liquid, based on the coupling between molecular spinning and fluid vorticity. This is possible using rotating electric fields and suitably chosen interfacial boundary conditions or transiently by suddenly switching on a homogeneous electric field. A static electric field, however, does not induce a steady state flow in channels, irrespective of the geometry. Using molecular dynamics (MD) simulations, we confirm that static fields do not lead to any pumping, in contrast to earlier publications. The pumping observed in MD simulations of carbon nanotubes and oil droplets in a static electric field is tracked down to an imprudent implementation of Lennard-Jones interaction truncation schemes.

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Citations

May 17, 2011·Journal of the American Chemical Society·Robert VáchaSylvie Roke
Feb 25, 2014·Journal of Colloid and Interface Science·Richard W O'BrienAlex M Djerdjev
Mar 1, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Sergio De LucaPeter J Daivis
Apr 26, 2013·The Journal of Chemical Physics·Sergio De LucaPeter J Daivis
Jun 19, 2014·The Journal of Physical Chemistry. a·Zhi ZhuHaiping Fang
Sep 26, 2013·The Journal of Physical Chemistry. B·Douwe Jan Bonthuis, Roland R Netz
Mar 17, 2016·The Journal of Chemical Physics·Douwe Jan BonthuisRoland R Netz
Feb 28, 2013·Biophysical Journal·Volker Knecht, Benjamin Klasczyk
Apr 27, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Sergio De LucaPeter J Daivis
Nov 9, 2011·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Ingo O Götze, Gerhard Gompper
Apr 22, 2011·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Douwe Jan BonthuisRoland R Netz
Jul 3, 2020·The Journal of Chemical Physics·S PullancheryS Roke
May 24, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Sleeba VargheseSarith P Sathian
Jul 9, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Amanuel Wolde-Kidan, Roland R Netz
May 19, 2011·The Journal of Physical Chemistry Letters·Dor Ben-Amotz
May 8, 2020·The Journal of Physical Chemistry. B·Andrew P CarpenterGeraldine L Richmond
Oct 16, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·David OstlerB D Todd
Oct 1, 2019·The Journal of Physical Chemistry Letters·Lisa B DreierMischa Bonn
Apr 16, 2020·Nano Letters·David OstlerB D Todd

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