Induced-charge Electrophoresis of Metallo-dielectric Particles
Fluid Dynamics
2009-11-13 v2
Abstract
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.
Keywords
Cite
@article{arxiv.0708.2417,
title = {Induced-charge Electrophoresis of Metallo-dielectric Particles},
author = {Sumit Gangwal and Olivier J. Cayre and Martin Z. Bazant and Orlin D. Velev},
journal= {arXiv preprint arXiv:0708.2417},
year = {2009}
}
Comments
11 pages, 4 figures; Supplementary Info: Last 2 pages, 2 figures