We study the role of ionic correlations on the electroosmotic flow in planar double-slit channels, without salt. We propose an analytical theory, based on recent advances in the understanding of...
In
this work, the effects of polarization of confining charged
planar dielectric surfaces on induced electroosmotic flow are investigated.
To this end, we use dissipative particle dynamics to model solvent
and ionic particles together with a modified Ewald sum method to model
electrostatic interactions and surfaces polarization. A relevant difference
between counterions number density profiles, velocity profiles, and
volumetric flow rates obtained with and without surface polarization
for moderate and high electrostatic coupling parameters is observed.
For low coupling parameters, the effect is negligible. An increase
of almost 500% in volumetric flow rate for moderate/high electrostatic
coupling and surface separation is found when polarizable surfaces
are considered. The most important result is that the increase in
electrostatic coupling substantially increases the electroosmotic
flow in all studied range of separations when the dielectric constant
of electrolytes is much higher than the dielectric constant of confining
walls. For the higher separation simulated, an increase of around
340% in volumetric flow rate when the electrostatic coupling is increased
by a factor of two orders of magnitude is obtained.
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