Negative dielectrophoresis-based particle separation by size in a serpentine microchannel |
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Authors: | Church Christopher Zhu Junjie Xuan Xiangchun |
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Institution: | Department of Mechanical Engineering, Clemson University, Clemson, SC, USA. |
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Abstract: | Dielectrophoresis has been widely used to focus, trap, concentrate, and sort particles in microfluidic devices. This work demonstrates a continuous separation of particles by size in a serpentine microchannel using negative dielectrophoresis. Depending on the magnitude of the turn-induced dielectrophoretic force, particles travelling electrokinetically through a serpentine channel either migrate toward the centerline or bounce between the two sidewalls. These distinctive focusing and bouncing phenomena are utilized to implement a dielectrophoretic separation of 1 and 3 μm polystyrene particles under a DC-biased AC electric field of 880 V/cm on average. The particle separation process in the entire microchannel is simulated by a numerical model. |
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