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Post date: 09-Oct-2010 04:30:57
Ever been frustrated that your cellphone has run out of juice at just the moment you need to place an important call--or worse, when you're in
the middle of one? Researchers have demonstrated the ability to use piezoelectric nanowires made of zinc oxide to convert 100-decibel
sound to a 50-millivolt AC current. If the team can refine the innovation so that a current can be generated at 70 dB and below (the loudest
humans speak in normal conversation), cellphone users would be able to charge their phones just by speaking into them.
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