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Non-coalescence of oppositely charged drops

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Uploaded on Sep 16, 2009

This movie shows non-coalescence (bouncing) at a higher field strength. A droplet of water (10 mM KCl, nominal diameter = 1.4 mm) moves through silicone oil (PDMS, 1000 cS). The black rectangular object at top is the tip of the electrode; the long black arc at bottom is the oil/water meniscus (cf. Figure 1 in main text). The applied potential was 1.0 kV, yielding an approximate field strength of 200 V/mm.
The capture frame rate was 1000 frames/sec, here played back at 25 frames/sec; the time lapse covers a period of 230 ms total. See Ristenpart et al., Nature 461, 377 (2009) for details.

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