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The separation of 1 and 5 μm particles under DEP field. (a) A uniform mixture distribution of 1 and 5 μm particles is depicted (1 μm particles were distributed over the entire electrode; the 5 μm particles were seen as the black points); (b) After applying 450 kHz, the 1 μm particles were attracted to the dot edge (p-DEP), whereas the 5 μm particles were repelled to the dot center (n-DEP).
