Abstract
Contact charging of a conducting droplet in a dielectric medium is introduced as a novel and useful digital microfluidic technology as well as an interesting scientific phenomenon. The history of this phenomenon, starting from original observations to its interpretations and applications, is presented. The basic principle of the droplet contact charging is also presented. Several fundamental aspects of the droplet contact charging from view points of electrochemistry, surface science, electrocoalescence, and electrohydrodynamics are mentioned. Some promising results for future applications and potential features as a next generation digital microfluidic technology are discussed, especially for 3D organ printing. Finally, implications and significance of the proposed technology for chemical engineering community are discussed.
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This article is dedicated to Prof. Hwayong Kim on the occasion of his retirement from Seoul National Univerisity.
Do Jin Im is a Professor in the Department of Chemical Engineering at Pukyong National University in Korea. He received his B.S. degree (POSTECH, Korea), M.S. degree (POSTECH, Korea), and Ph.D. degree (POSTECH) all in Chemical Engineering and was a postdoctoral fellow at POSTECH. He worked for several years at the Samsung Corning Precision Glass, Co Ltd and worked at POSTECH as a research assistant Professor before joining Pukyong National University in 2014. His research interests include Droplet Contact Charging Phenomena, Droplet Microfluidics, Biomicrofluidics, Bio-Engineering, 3D Organ printing, Transport Phenomena, Numerical Modeling, Electrostatics, and Electrokinetics.
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Im, D.J. Next generation digital microfluidic technology: Electrophoresis of charged droplets. Korean J. Chem. Eng. 32, 1001–1008 (2015). https://doi.org/10.1007/s11814-015-0092-0
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DOI: https://doi.org/10.1007/s11814-015-0092-0