Induced-charge Electrophoresis of Metallo-dielectric Particles

Details Induced-charge Electrophoresis of Metallo-dielectric Particles Induced-charge Electrophoresis of Metallo-dielectric Particles

2007-08-17

arxiv.org/abs/0708.2417v2

Physics

Fluid Dynamics

11 pages, 4 figures; Supplementary Info: Last 2 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.100.058302

The application of AC electric fields in aqueous suspensions of anisotropic particles leads to unbalanced liquid flows and nonlinear, induced-charge electrophoretic (ICEP) motion. We report experimental observations of the motion of "Janus" microparticles with one dielectric and one metal-coated hemisphere induced by uniform fields of frequency 100 Hz - 10 kHz in NaCl solutions. The motion is perpendicular to the field axis and persists after particles are attracted to a glass wall. This phenomenon may find applications in microactuators, microsensors, and microfluidic devices.

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