Electrokinetic concentration, patterning, and sorting of colloids with thin film heaters
2013
Velasco, Vanessa | Williams, Stuart J.
Reliable and simple techniques for rapid assembly and patterning of colloid architectures advance the discovery and implementation of such nanomaterials. This work demonstrates rapid electrokinetic two-dimensional assembly of colloidal structures guided by the geometry of thin film heaters within a parallel-plate device. This system is designed to enable either independently addressable or massively parallel colloidal assembly. A combination of electrothermal hydrodynamics, particle-electrode, and particle–particle electrokinetic interactions governs their assembly. Concentration and patterning of structures are shown with 1.0μm polystyrene particles and sorting between 1.0μm and 2.0μm particles is demonstrated.
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