Abstract
Sliding of one charged body past another in an electrolyte solution produces a streaming current and/or a streaming potential profile in the gap between the surfaces. Any streaming potential produced by this motion will alter the Maxwell stress field in the gap as well as the net hydrodynamic force acting on the surfaces. A lubrication analysis of this effect is presented for two-dimensional flow in a gap between two surfaces bearing thin double layers. The main effect is to generate “electrokinetic lift”, a normal force tending to push the bodies apart, which can be comparable to double-layer repulsion for fluids of low conductivity. This normal force is always repulsive, regardless of whether the surfaces bear charges of like or unlike sign. Besides reducing the elution volume of particles in chromatographic columns, this lift might inhibit capture of particles from moving fluids or cause detachment of particles from walls by flow tangent to the wall.
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