Tuesday, October 18, 2011: 5:03 PM
L100 E (Minneapolis Convention Center)
The AC electroosmosis (ACEO) flow field in the vicinity of conducting electrodes is mapped by the measurement of Stokes-Einstein forces on an optically trapped colloidal particle. Dielectrophoresis (DEP) of the probe particle is eliminated by measuring at the particle’s DEP crossover frequency. At this frequency the DEP force on the particle vanishes. Isolation of ACEO from DEP of the probe utilizes the fact that the ACEO flow velocity depends strongly on the electric field, which is spatially dependent, whereas the DEP crossover frequency, is independent of the electric field. Elimination of the particle’s DEP permits unambiguous mapping of the ACEO velocity field.
See more of this Session: Electrokinetic Behavior of Microparticles and Nanoparticles: Fundamentals and Applications
See more of this Group/Topical: Topical 3: 2011 Annual Meeting of the American Electrophoresis Society (AES)
See more of this Group/Topical: Topical 3: 2011 Annual Meeting of the American Electrophoresis Society (AES)