Optically modulated rapid electrokinetic patterning for micro and nano particles

Aloke Kumar; Stuart J. Williams; Steven T. Wereley

doi:10.1117/12.831726

9 July 2009 Optically modulated rapid electrokinetic patterning for micro and nano particles

Aloke Kumar, Stuart J. Williams, Steven T. Wereley

Proceedings Volume 7371, Novel Optical Instrumentation for Biomedical Applications IV; 737110 (2009) https://doi.org/10.1117/12.831726
Event: European Conferences on Biomedical Optics, 2009, Munich, Germany

Abstract

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.

Citation Download Citation

Aloke Kumar, Stuart J. Williams, and 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); https://doi.org/10.1117/12.831726

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