FIGURE 1. Electrically driven bouncing of water in oil.

From the following article:

Non-coalescence of oppositely charged drops

W. D. Ristenpart, J. C. Bird, A. Belmonte, F. Dollar & H. A. Stone

Nature 461, 377-380(17 September 2009)

doi:10.1038/nature08294

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Left, diagram of the experimental apparatus ('water' indicates 0.2 M KCl). A high-voltage (HV) power supply provides the electric field. Right, droplet coalescence (top) and bouncing (bottom); time (t in ms) is relative to the video frame labelled t = 0. Top, E = 160 V mm-1, d.c. The drop slowly approached the oil/water interface, and then coalesced on contact. Bottom, E = 300 V mm-1, d.c. The drop quickly approached the oil/water meniscus, briefly made apparent contact, then moved away in the opposite direction. Scale bar, 0.5 mm. Oil is 1,000 centistokes (1,000 cSt) polydimethylsiloxane.

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