title: Negative dielectrophoresis-based particle separation by size in a serpentine microchannel.
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.
authors.affiliation: Department of Mechanical Engineering, Clemson University, Clemson, SC, USA.
authors.forename: Christopher
authors.initials: C
authors.lastname: Church
authors.forename: Junjie
authors.initials: J
authors.lastname: Zhu
authors.forename: Xiangchun
authors.initials: X
authors.lastname: Xuan
mesh_terms: D003198:Computer Simulation; D004586:Electrophoresis / Q000295:instrumentation* / Q000379:methods*; D005456:Fluorescent Dyes; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation* / Q000379:methods*; D008956:Models, Chemical; D010316:Particle Size
chemical_list: D005456:Fluorescent Dyes