ambient energy sources

False-color time-lapse images captured via high-speed imaging show a droplet jumping (colored green) from a superhydrophobic copper oxide fin to a hydrophilic (water-attracting) copper fin (colored orange). (Courtesy of Nenad Miljkovic and Daniel J. Preston)

Getting a charge out of water droplets

Water condensing and jumping from a superhydrophobic surface can be harnessed to produce electricity. Last

Ambient Energy Could Replace Batteries

Stray heat, electromagnetic fields or even mechanical sources can provide power for portable electronics and