Charge Your Cellphone By Talking

Fight disinformation: Sign up for the free Mother Jones Daily newsletter and follow the news that matters.


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.

TIME IS RUNNING OUT!

We have an ambitious $350,000 online fundraising goal this month and it's truly crunch time: About 15 percent of our yearly online giving usually comes in during the final week of the year, and in "No Cute Headlines or Manipulative BS," we explain why we simply can't afford to come up short right now.

The bottom line: Corporations and powerful people with deep pockets will never sustain the type of journalism Mother Jones exists to do. And advertising or profit-driven ownership groups will never make time-intensive, in-depth reporting viable.

That's why donations big and small make up 74 percent of our budget this year. There is no backup to keep us going, no alternate revenue source, no secret benefactor. If readers don’t donate, we won’t be here. It's that simple.

And if you can help us out with a donation right now, all online gifts will be matched thanks to an incredibly generous matching gift pledge.

payment methods

TIME IS RUNNING OUT!

We have an ambitious $350,000 online fundraising goal this month and it's truly crunch time: About 15 percent of our yearly online giving usually comes in during the final week of the year, and in "No Cute Headlines or Manipulative BS," we explain why we simply can't afford to come up short right now.

The bottom line: Corporations and powerful people with deep pockets will never sustain the type of journalism Mother Jones exists to do. And advertising or profit-driven ownership groups will never make time-intensive, in-depth reporting viable.

That's why donations big and small make up 74 percent of our budget this year. There is no backup to keep us going, no alternate revenue source, no secret benefactor. If readers don’t donate, we won’t be here. It's that simple.

And if you can help us out with a donation right now, all online gifts will be matched thanks to an incredibly generous matching gift pledge.

payment methods

We Recommend

Latest

Sign up for our free newsletter

Subscribe to the Mother Jones Daily to have our top stories delivered directly to your inbox.

Get our award-winning magazine

Save big on a full year of investigations, ideas, and insights.

Subscribe

Support our journalism

Help Mother Jones' reporters dig deep with a tax-deductible donation.

Donate