Abstract
Patterning of colloidal particles on surfaces is an application that has evinced wide interest from the fluid mechanics community, due to its possible applicability in a number of engineering situations such as manufacture of photonic crystals[1], bioengineering tissues[2] and lab on chip technology[3], etc. Recently Kumar et al. had proposed the technique of rapid electrokinetic patterning (REP) [4], a hybrid opto-electric manipulation technique that can manipulate and pattern colloidal particles on an electrode surface. REP utilizes optical landscapes to create local gradients in temperature on an electrode substrate. This allows local changes in permittivity and conductivity of the fluid. Colloidal particles can then be dynamically patterned at the illuminated locations of the electrode surface. REP can be used for capturing selective group of particles and thus it serves as a sorting technique too [5].
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