Friction And Static Could Charge Smartphones

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Static electricity is good for sticking balloons to walls, but who knew it could be used to prolong the battery life of a smartphone. Sihong Wang and Long Lin, graduate students in Georgia Tech's

materials science department have

developed a two-layered material that generates power from static electricity and flexing.

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They've used a thin film made of a layer of polymer and another of

aluminum. Both layers have tiny structures etched on them at the nanometer scale. When the plastic and the metal come in contact with each

other, they accumulate a static electric charge. Flexing them generates a current.

The

etched nanostructures increase the surface area, which gives

electrons a lot more room to gather and boosts the charge accumulated. The

efficiency with which the material turns the mechanical motion of flexing into electricity can go as high as 40 percent, according to the paper.

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Wang has done similar work before: in 2009 he demonstrated

that a hamster

could wear a jacket that generated power in a similar way.

So how much power can it make? In a paper in the journal Nano Letters, Wang and

his team say they have hit 230 volts, at 15.5 microamperes per square

centimeter, with a power output of 128 milliwatts per cubic centimeter. That

means a sheet the size of the latest iPod Nano –- about three inches by 1.6

inches –- would generate just enough to charge the iPod as it is being flexed.

If it were used in the real world, odds are this wouldn't

replace a battery, but it could extend the time between charges.

Via Technology

Review

Credit: Danilo Calilung/Corbis

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