Electrorotation of Metallic Microspheres
- 8 February 2011
- journal article
- Published by American Chemical Society (ACS) in Langmuir
- Vol. 27 (6), 2128-2131
- https://doi.org/10.1021/la104784m
Abstract
Electrorotation (ER) experiments of gold-coated micrometer-sized spheres suspended in an electrolyte are presented for three different ionic conductivities over the frequency range of 100 Hz to 40 MHz. The direction of rotation was observed to be counter-field (opposite to the rotating field vector) with a single rotation peak. The maximum in rotation occurs for a frequency on the order of the reciprocal RC time constant for charging the double layer at the gold surface. Dielectrophoresis (DEP) experiments showed that the gold-coated particles undergo negative DEP at low frequencies and positive DEP at high frequencies with the same relaxation frequency as electrorotation. No induced charge electrophoresis was noticeable in ER or DEP experiments.Keywords
This publication has 20 references indexed in Scilit:
- Towards an understanding of induced-charge electrokinetics at large applied voltages in concentrated solutionsAdvances in Colloid and Interface Science, 2009
- Hydrodynamic interactions in metal rodlike-particle suspensions due to induced charge electroosmosisPhysical Review E, 2009
- Synthesis and Single‐Particle Optical Detection of Low‐Polydispersity Plasmonic‐Superparamagnetic NanoparticlesAdvanced Materials, 2008
- Rotational electrophoresis of striped metallic microrodsPhysical Review E, 2007
- Pumping of liquids with traveling-wave electroosmosisJournal of Applied Physics, 2005
- Induced-charge electro-osmosisJournal of Fluid Mechanics, 2004
- Induced-Charge Electrokinetic Phenomena: Theory and Microfluidic ApplicationsPhysical Review Letters, 2004
- Fluid flow induced by nonuniform ac electric fields in electrolytes on microelectrodes. III. Observation of streamlines and numerical simulationPhysical Review E, 2002
- Theory of the Low-Frequency Electrorotation of Polystyrene Particles in Electrolyte SolutionThe Journal of Physical Chemistry, 1996
- Surface conductance and other properties of latex particles measured by electrorotationThe Journal of Physical Chemistry, 1987