Development of AC electrokinetics-based methodologies for nanoparticle assembly

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The controlled manipulation and organization of colloidal particles (i.e., particles with size smaller than 1 micron stably suspended in a fluid) into one-, and multi-dimensional ordered structures represents the first step towards the fabrication of a large number of miniaturized products of great technological importance. Structural attributes such as long-range order, high packing density, high surface-to-volume ratio, and reproducible shape and dimensions are highly desirable in applications ranging from miniaturized sensors and actuators, to nanoreactors, catalysts, photonic crystals, and high-density magnetic recording media. However, the organization of colloidal particles, particularly nanoparticles (size<100 nm), into ordered structures devoid of defects and extending over length scales much larger than the particle size remains a big challenge.