Modeling electrokinetics in ionic liquids.
Using direct numerical simulations, we provide a thorough study regarding the electrokinetics of ionic liquids. In particular, modified Poisson-Nernst-Planck equations are solved to capture the crowding and overscreening effects characteristic of an ionic liquid. For modeling electrokinetic flows in an ionic liquid, the modified Poisson-Nernst-Planck equations are coupled with Navier-Stokes equations to study the coupling of ion transport, hydrodynamics, and electrostatic forces. Specifically, we consider the ion transport between two parallel charged surfaces, charging dynamics in a nanopore, capacitance of electric double-layer capacitors, electroosmotic flow in a nanochannel, electroconvective instability on a plane ion-selective surface, and electroconvective flow on a curved ion-selective surface. We also discuss how crowding and overscreening and their interplay affect the electrokinetic behaviors of ionic liquids in these application problems.
Physical and Computational Science Directorate, Pacific Northwest National Laboratory, Richland, WA, USA.
Chao
C
Wang
Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA, USA.
Jie
J
Bao
Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI, USA.
Wenxiao
W
Pan
Physical and Computational Science Directorate, Pacific Northwest National Laboratory, Richland, WA, USA.
Xin
X
Sun
D003198:Computer Simulation; D053841:Electroosmosis; D052578:Ionic Liquids / Q000737:chemistry*; D008962:Models, Theoretical; D016012:Poisson Distribution; D016062:Porosity; D055672:Static Electricity
D052578:Ionic Liquids
Electroconvective flow; Electrokinetics; Ionic liquids; Modified Poisson-Nernst-Planck equations