Abstract
Insulator-based dielectrophoresis offers advantages over electrode-based dielectrophoresis in many ways, and has been extensively used to manipulate, sort and selectively trap particles and biological species in Lab-on-a-chip devices. This work exploits insulator-based dielectrophoresis in two configurations of asymmetric ratchet microchannels to trap microscale particles using DC biased AC voltages. It demonstrates for that dynamics of the DEP trapping zones changes in response to voltages higher than the threshold trapping voltages, and also with longer experimental runtimes. Numerical modeling is used to support and validate the results, and the physical interpretations of the changing DEP are explained using a dimensionless trapping number. With the help of the microchannel configurations, it is revealed that the orientation of the asymmetric ratchet relative to the direction of DC electric field plays a key role in determining the trapping patterns
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