Charge Your Cellphone By Talking

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112px-Cell_phone_icon.svg.png Imagine a self-powered cellphone that charges by the pressure waves formed when you talk or walk. Researchers have found a certain type of piezoelectric material that can covert energy at a 100 percent increase when manufactured at a very small size (specifically 21 nanometers in thickness). This suggests that disturbances in the form of sound waves could be harvested for powering nanodevices and microdevices of the future.

Here’s how it works. Piezoelectrics are (usually) crystal or ceramic materials that generate voltage when a form of mechanical stress is applied (think car cigarette lighters). It’s an old technology now powering dance floors in Europe. Combine piezoelectrics with the strange, infinitessimally small nanoworld, where many materials change their properties dramatically (gold turns red, toxic, and liquid at room temperature; opaque materials like copper become transparent; insulators like silicon become conductors). Piezoelectric materials at 21-nm thick turn into power-harvesting titans.

The findings could have potentially profound effects for low-powered electronic devices like cell phones and laptops. Many contain nano-sized components (1 nanometer equals one-billionth of a meter). All need a lot of recharging. But pressure-senstitive, self-powered piezoelectrics could harness energy from the sound waves in your speech or your walk. Free of charge takes on a whole new meaning.

The research is published in Physical Review B, the scientific journal of the American Physical Society.

Julia Whitty is Mother Jones’ environmental correspondent, lecturer, and 2008 winner of the PEN USA Literary Award, the Kiriyama Prize and the John Burroughs Medal.

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SIX TRUTHS

Reclaiming power from those who abuse it often starts with telling the truth. And in "This Is How Authoritarians Get Defeated," MoJo's Monika Bauerlein unpacks six truths to remember during the homestretch of an election where democracy, truth, and decency are on the line.

Truth #1: The chaos is the point.

Truth #2: Team Reality is bigger than it seems.

Truth #3: Facebook owns this.

Truth #4: When we go to work, we're in the fight.

Truth #5: It's about minority rule.

Truth #6: The only thing that can save us is…us.

Please take a moment to see how all these truths add up, because what happens in the weeks and months ahead will reverberate for at least a generation and we better be prepared.

And if you think journalism like Mother Jones'—that calls it like it is, that will never acquiesce to power, that looks where others don't—can help guide us through this historic, high-stakes moment, and you're able to right now, please help us reach our $350,000 goal by October 31 with a donation today. It's all hands on deck for democracy.

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