| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 606862 | Journal of Colloid and Interface Science | 2015 | 8 Pages |
•Trapping percentage is obtained for frequencies ranging from 1 kHz to 1 MHz.•At low frequencies alternating-current-electro-osmosis lowers trapping percentages.•Background flow may alter the effective cross-over frequency of particles/cells.•Apparent shift in crossover frequency results in premature onset of zero-trapping.
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.
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