Induced-charge Electrophoresis of Metallo-dielectric Particles
Sumit Gangwal, Olivier J. Cayre, Martin Z. Bazant, Orlin D. Velev
TL;DR
This paper investigates the induced-charge electrophoretic motion of Janus particles with dielectric and metal-coated hemispheres under AC electric fields, revealing perpendicular motion that could be useful in microfluidic applications.
Contribution
It provides experimental insights into the ICEP behavior of Janus particles across a range of AC field frequencies, highlighting a novel perpendicular motion phenomenon.
Findings
Particles move perpendicular to the electric field axis.
Motion persists after particles reach a glass wall.
Potential applications in microactuators and microfluidic devices.
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.
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