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.
© 2009 OSA/SPIE
PDF ArticleMore Like This
Samuel Bockenhauer, Alexandre Fürstenberg, Quan Wang, Michael Bokoch, Xiao Jie Yao, Brian DeVree, Roger K. Sunahara, Brian K. Kobilka, and W. E. Moerner
JWC16 Laser Science (LS) 2009
Jason K. King, Lloyd M. Davis, Brian K. Canfield, Philip C. Samson, and William H. Hofmeister
FWM4 Frontiers in Optics (FiO) 2009
Justus C. Ndukaife, Avanish Mishra, Urcan Guler, A. G. Agwu Nnanna, Steve Wereley, and Alexandra Boltasseva
FTh1K.2 CLEO: QELS_Fundamental Science (CLEO:FS) 2014