title: The influence of flow intensity and field frequency on continuous-flow dielectrophoretic trapping.
abstract: We examine the combined influence of the intensity of pressure driven background flow and the frequency of the applied field on the continuous-flow dielectrophoretic trapping behavior of micro-particles within a micro-channel. Using an embedded interdigitated electrode array, we find that the measured trapping percentage over a continuous frequency range exhibits several curious effects which are strongly dependent on the flow intensity, including an apparent shift of the cross-over frequency and low-frequency dispersion. A numerical and theoretical model accounting for the combined effects of pressure-driven flow, dielectrophoresis and alternating-current electro-osmosis on the equation of motion for the particle is used to qualitatively describe the main experimental results.
authors.affiliation: Faculty of Mechanical Engineering, Micro- and Nanofluidics Laboratory, Technion - Israel Institute of Technology, Technion City 32000, Israel.
authors.forename: Dana
authors.initials: D
authors.lastname: Ben-Bassat
authors.affiliation: Faculty of Mechanical Engineering, Micro- and Nanofluidics Laboratory, Technion - Israel Institute of Technology, Technion City 32000, Israel.
authors.forename: Alicia
authors.initials: A
authors.lastname: Boymelgreen
authors.affiliation: Faculty of Mechanical Engineering, Micro- and Nanofluidics Laboratory, Technion - Israel Institute of Technology, Technion City 32000, Israel. Electronic address: yossifon@technion.ac.il.
authors.forename: Gilad
authors.initials: G
authors.lastname: Yossifon
keywords: Dielectrophoresis; Microfluidics