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Electrohydrodynamic "drop-and-place" particle deployment C.-H. Chen, D. A. Saville, and I. A. Aksaya

Summary: Electrohydrodynamic "drop-and-place" particle deployment
C.-H. Chen, D. A. Saville, and I. A. Aksaya
Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544
Received 29 October 2005; accepted 7 March 2006; published online 13 April 2006
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 m
diameter particles using a 50 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. 2006 American Institute of Physics.
DOI: 10.1063/1.2191733
Contemporary techniques for particle deployment can be
roughly classified as robotic, lithography directed, and field
directed. Robotic manipulation is accomplished using micro-
electromechanical system MEMS effectors for pick and
place or scanning probes such as atomic force microscope
this category offers direct manipulation at the nanos-


Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University
Chen, Chuan-Hua - Department of Mechanical Engineering and Materials Science, Duke University


Collections: Engineering; Materials Science