Mesoscopic simulations of the counterion-induced electroosmotic flow - a comparative study

摘要

We present mesoscopic simulations of the counterion-induced electroosmoticflow in different electrostatic coupling regimes. Two simulation methods arecompared, Dissipative Particle Dynamics (DPD) and coupledLattice-Boltzmann/Molecular Dynamics (LB/MD). A general mapping scheme to matchDPD to LB/MD is developed. For the weak-coupling regime, analytic expressionsfor the flow profiles in the presence of partial-slip as well as no-slipboundary conditions are derived from the Poisson-Boltzmann and Stokesequations, which are in good agreement with the numerical results. Theinfluence of electrofriction and partial slip on the flow profiles isdiscussed.