Dispensing picoliter droplets on substrates using dielectrophoresis |
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| Affiliation: | 1. Department of Mechanical Engineering, Myongji University, Yongin 449-728, South Korea;2. SAIT—Samsung Advanced Institute of Technology, Yongin, Gyeonggido, South Korea;1. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China;2. Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, China;3. Department of Chemistry, University of Science and Technology of China, Hefei 230026, China;1. Biomedical Engineering Department, Faculty of Medicine, McGill University, 3775 University Street, Montreal, Quebec, H3A 0G4, Canada;2. Faculty of Dentistry, McGill University, Strathcona Anatomy & Dentistry Building, 3640 University Street, Montreal, Quebec, H3A 0G4, Canada;1. School of Materials Science and Engineering, Hebei Engineering Laboratory of PFC, Hebei University of Technology, Tianjin 300130, China;2. Department of Physics, Tianjin Chengjian University, Tianjin 300384, China |
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| Abstract: | Liquid dielectrophoresis is exploited to initiate rapid, transient flow of aqueous liquids along co-planar electrodes patterned on insulating substrates. The flow induced by the non-uniform electric field leads to a new electrostatic equilibrium. A reduced-order model predicts the transient motion of the rivulet. When the field is removed, capillary instability breaks up the rivulet into regularly spaced droplets. Periodic circular bumps patterned on the structure, when spaced according to the most unstable wavelength based on Rayleigh's inviscid theory for the cylindrical liquid jet, lead to uniformly spaced and sized droplets. A correction factor, based on the dimensionless Ohnesorge number, accounts successfully for the effect of viscosity. |
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