Induced-charge electro-osmosis around metal and Janus spheres in water: Patterns of flow and breaking symmetries
arXiv:1411.1478 · doi:10.1103/PhysRevE.90.051002
Abstract
We establish experimentally the flow patterns of induced-charge electro-osmosis (ICEO) around immobilized metallic spheres in aqueous electrolyte. The AC field modifies local electrolyte concentration and causes quadrupolar flows with inward velocities being smaller than the outward ones. At high fields, the flow becomes irregular, with vortices smaller than the size of the sphere. Janus metallo-dielectric spheres create dipolar flows and pump the fluid from the dielectric toward the metallic part. The experimentally determined far-field flows decay with the distance as r-3.
arXiv comment13pages, 4 figures
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- Induced Charge Capacitive Deionization: The electrokinetic response of a porous particle to an external electric field
- Emergence of colloidal patterns in AC electrical fields
- Q-tensor model for electrokinetics in nematic liquid crystals
- Steric effects in induced-charge electro-osmosis for strong electric fields
- Soliton-induced liquid crystal enabled electrophoresis