To make the drops levitate, the team coated a water-repellent surface of tiny bumps with a lubricant. When water condensed on the untreated surface, it formed droplets that were pinned in place (see video above). But on the thin slippery layer, they zip around at a speed never seen before on a hydrophobic surface.
The high velocity allows condensed droplets to move out of the way so that new ones can form. That could be useful in power plants, where condensers turn steam from generators back into water, and in desalination plants, where condensers are key. By increasing the rate of droplet formation, the new technique should speed up such processes. . . .
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