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Could tiny water droplets lower your electric bill? (+video)

Researchers report that a water droplet acquires a charge when it 'jumps' from a water-repellant surface, a find that could make power plants more efficient.

Jumping water droplets could mean more efficient power plants.
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The activities of bantam water droplets in just one region of a power plant could make a significant difference in the output of power plants, scientists say.

A team of MIT researchers report this week that water droplets that “jump” from a water-repelling surface acquire a charge that prevents them from returning to that surface. The find makes an important leap in a burgeoning effort to harness “jumping” water droplets in making power plants more efficient.

“There has generally been a lot of buzz in this area of research,” says Nenad Miljkovic, a postdoctoral associate at MIT and a co-author on the paper, published in Nature Communications.

“The concept of jumping droplets is not new, and we have been working on it and publishing papers for a while now,” he said, referring to an earlier paper from his team, published this winter in Nano Letters. “However, none of the previous studies (including ours) had any idea that the droplets were charged.”

A superhydrophobe is a kind of hydrophobe, a molecule with water-repellant properties. Hydrophobic molecules include fats and oils — hence the adage, “oil and water don’t mix” and the apparent fruitlessness of trying to get a homogenous salad dressing out of oil and vinegar. But a superhydrophobe is "super" because, unlike just a hydrophobe, it has a rough either micro or nanoscale structure.


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