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http://dx.doi.org/10.3795/KSME-B.2012.36.3.241

Deterministic Lateral Displacement as a Function of Particle Size Using a Piecewise Curved Planar Interdigitated Electrode Array  

Han, Song-I (Dept. of Nano Engineering, Inje Univ.)
Joo, Young-Dong (Dept. of Hemato-Oncology, Inje Univ.)
Han, Ki-Ho (Dept. of Nano Engineering, Inje Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.36, no.3, 2012 , pp. 241-249 More about this Journal
Abstract
This paper presents the lateral displacement of a particle passing over a planar interdigitated electrode array at an angle as a function of particle size. The lateral displacement was also measured as a function of the angle between the electrode and the direction of flow. A simplified line charge model was used for numerical estimation of the lateral displacement of fluorescent polystyrene (PS) beads with three different diameters. Using the lateral displacement as a function of particle size, we developed a lateral dielectrophoretic (DEP) microseparator, which enables the continuous discrimination of particles by size. The experiment using an admixture of 3-, 5-, and $10-{\mu}m$ PS beads showed that the lateral DEP microseparator could continuously separate out 99.86% of the $3-{\mu}m$ beads, 98.82% of the $5-{\mu}m$ beads, and 99.69% of the $10-{\mu}m$ beads. The lateral DEP microseparator is thus a practical device for the simultaneous separation of particles according to size from a heterogeneous admixture.
Keywords
Blood; Cell Separation; Interdigitated Electrode Array; Lateral-Dielectrophoresis; Microfluidics;
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