6:45pm

Tue March 29, 2011
The Two-Way

Fighting Fire With Electricity? It Can Happen Say Researchers

Harvard researcher Ludovico Cademartiri presented quite a finding on Sunday at the 241st National Meeting and Exposition of the American Chemical Society in Anaheim, Calif.

Cademartiri unveiled a study in which he put out an 18 inch flame with nothing but a wand powered by a 600 watt amplifier — about the amount needed to power a home stereo system.

MSNBC's Cosmic Log reports that scientists have know that electric fields can interact with flames for 200 years. But most experiments used direct current, or DC, instead of an alternating current (AC).

Here's how the scientists explained their experiment to the Harvard Crimson:

The scientists took a piece of metallic electrode in the shape of thin metal wire and connected it to a high voltage power supply and positioned that wire in the proximity of a controlled methane gas flame. Then, they turned on the high voltage source which sinusoidally raised and lowered the voltage.

"Think of it as blowing out a flame," said Kyle J. M. Bishop, a former postdoctoral fellow at the George M. Whitesides Research Group who continues to collaborate with Cademartiri and the Harvard team. "The [electrical field] pulls to separate the region that's hot and burning from the unburnt fuel, so that fuel will not continue to burn."

Cademartiri told the Houston Chronicle it's too early to tell how an electric current could affect a larger flame. But he said he's optimistic about the potential.

The Guardian imagines a day when a firefighter would only need "an ultra-portable power pack and wire rather than a cumbersome hose and large quantities of water or foam." Copyright 2011 National Public Radio. To see more, visit http://www.npr.org/.