1 research outputs found
Combined Effects of Interfacial Permittivity Variations and Finite Ionic Sizes on Streaming Potentials in Nanochannels
In this work, we investigate the effects of local permittivity
variations, induced by a preferential orientation and exclusion of
water dipoles close to channel walls, and the effects of finite-sized
ions on the induced streaming potential in nanochannels. We make a
detailed analysis of the underlying physicochemical interactions by
considering combinations of cases where ions are considered to be
point sized/finite sized and permittivity variation effects to be
present/absent. By accounting for the dielectric friction (which in
turn is a function of the local permittivity) in addition to the classical
Stokes friction, we show that for high interfacial potentials and
narrow confinements, the induced streaming potential field for the
cases in which the polarization effects are considered for finite-sized
ions is remarkably higher than for the cases in which the polarization
effects are neglected. Thus, by coupling the nonlinear effects of
finite-sized ions and water dipole polarization along with the dielectric
friction, we open a new paradigm of streaming potential predictions
for narrow fluidic confinements, bearing far-ranging scientific and
technological consequences in nanoscale science and technology