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Proceedings Paper

Optically modulated rapid electrokinetic patterning for micro and nano particles
Author(s): Aloke Kumar; Stuart J. Williams; Steven T. Wereley
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Paper 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.

Paper Details

Date Published: 9 July 2009
PDF: 8 pages
Proc. SPIE 7371, Novel Optical Instrumentation for Biomedical Applications IV, 737110 (9 July 2009); doi: 10.1117/12.831726
Show Author Affiliations
Aloke Kumar, Birck Nanotechnology Ctr. and School of Mechanical Engineering, Purdue Univ. (United States)
Stuart J. Williams, Birck Nanotechnology Ctr. and School of Mechanical Engineering, Purdue Univ. (United States)
Steven T. Wereley, Birck Nanotechnology Ctr. and School of Mechanical Engineering, Purdue Univ. (United States)


Published in SPIE Proceedings Vol. 7371:
Novel Optical Instrumentation for Biomedical Applications IV
Christian D. Depeursinge; I. Alex Vitkin, Editor(s)

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