Non-coalescence of oppositely charged drops

W. D. Ristenpart (), J. C. Bird, A. Belmonte, F. Dollar and H. A. Stone
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W. D. Ristenpart: Department of Chemical Engineering and Materials Science,
J. C. Bird: School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA
A. Belmonte: W. G. Pritchard Laboratories, Pennsylvania State University, University Park, Pennsylvania 16802, USA
F. Dollar: School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA
H. A. Stone: School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA

Nature, 2009, vol. 461, issue 7262, 377-380

Abstract: Bouncing with charges The movement of drops in electric fields plays a role in processes as diverse as storm cloud formation, ink-jet printing and lab-on-a-chip manipulations. An important factor in practical applications is the tendency for adjacent drops to coalesce, usually assumed to be favoured if drops are oppositely charged and attracted to each other. Now Ristenpart et al. show that when oppositely charged drops move towards each other in an electric field whose strength exceeds a critical value, the drops simply 'bounce' off one another. This observation calls for a re-evaluation of our understanding of all processes involving electrically induced drop motion.

Date: 2009
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DOI: 10.1038/nature08294

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