Electrohydrodynamic "drop-and-place" particle deployment


Chen, C. H. ; Saville, D. A. ; Aksay, I. A. Electrohydrodynamic "drop-and-place" particle deployment. Applied Physics Letters 2006, 88.

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The "drop-and-place" paradigm aims at delivering and positioning liquid drops using a pulsed electrohydrodynamic jet. On-demand drops much smaller than the diameter of the delivery nozzle may also contain particles. We report proof-of-concept experiments on the delivery of single 2 mu m diameter particles using a 50 mu m nozzle and identify the control parameters for dosing and positioning accuracies. A positioning accuracy at the micrometer level is achieved by eliminating contact line pinning on a hydrophobic surface and minimizing impingement-induced motion. The dosing statistics follow the random Poisson distribution, indicating that single-particle accuracy can be achieved using a gating mechanism. (c) 2006 American Institute of Physics.