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. 2020 Apr 25;11(5):451. doi: 10.3390/mi11050451

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Effect of particle size on the dielectrophoretic focusing of polystyrene particles in the symmetric ratchet microchannel under a fixed DC electric field of 250 V/cm: (a) Comparison of the experimentally obtained and numerically predicted (top half of the left- and right-most images only) trajectories (traveling from left to right) of 3 (bottom row), 5 (middle row), and 10 µm (top row) particles, respectively, at varying locations of the microchannel; (b) Comparison of the experimentally measured (symbols with error bars) and numerically calculated (curves) particle focusing ratios among the three types of particles.