Nonuniform electro-osmotic flow on charged strips and its use in particle trapping

摘要: In this article, we investigate theoretically electro-osmotic flow set up by charged strips on an otherwise uncharged surface. Starting with a single-strip problem demonstrate that for simple polynomial surface charge distributions several basic solutions can be derived in closed forms constituted the analogous idea-flow solutions, which provide more lucid way of revealing features. These reveal two types topology: draining-in/pumping-out streaming and pair microvortices symmetric antisymmetric distributions, respectively. For arbitrary distribution, complicated structures found superposition these solutions. We further extend analysis to uniformly show how characteristics vary strips' dimensions zeta potentials. The far-field velocity behavior is also asymptotically identified indicates hydrodynamic nature typically long-range. An application particle trapping vortices investigated first time. collaboration short-range attraction effects facilitated converging stagnation point, but not asymmetric vortices.