9 July 2009 Optically modulated rapid electrokinetic patterning for micro and nano particles
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We show an optically induced AC electrokinetic technique that rapidly and continuously accumulates colloids on an electrode surface resulting in a crystalline-like monolayer aggregation. We demonstrate colloidal aggregation for particles ranging from 100 nm to 3 μm. Electrothermal hydrodynamics produce a microfluidic vortex that carries particles in suspension towards its center where they are trapped by low-frequency AC electrokinetic forces. We characterize the rate of particle aggregation as a function of the applied AC voltage and hence characterize trapping kinetics of this technique. We show that inter-particle distance varies with frequency and we explain this in the light of available theory.
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Aloke Kumar, Aloke Kumar, Stuart J. Williams, Stuart J. Williams, Steven T. Wereley, Steven T. Wereley, } "Optically modulated rapid electrokinetic patterning for micro and nano particles", Proc. SPIE 7371, Novel Optical Instrumentation for Biomedical Applications IV, 737110 (9 July 2009); doi: 10.1117/12.831726; https://doi.org/10.1117/12.831726

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