That’s the concept of some researchers from from the University of Wisconsin Madison. They think the concept may be able to generate as much as 20 watts wile you walk. Here are some quotes from an article (http://ow.ly/6E6bA) at TechCrunch:
“What they’ve done is introduce a fluid made up of tiny metal microdroplets into a special substrate. When your foot presses down on it, the droplets are forced through the substrate, which generates electricity by a means known as reverse electrowetting (that’s probably patent pending, but you can read the paper in Nature).
Once the energy has been grabbed, it can be held for drawing off later or used immediately to power a device. They suggest a sort of relay that would do a mobile phone’s high-power transmitting for it, while using a lower-power signal to send stuff to the phone, saving battery life”
If you’d like to get deeper into the science behind this concept, visit the article at Nature magazine (http://ow.ly/6E6dQ).
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