MIT produces fibers that can speak, hear


Different-shaped fibers can emit sounds in a variety of ways.
Different-shaped fibers can emit sounds in a variety of ways. MIT

The walls have ears, the saying goes--but at some point, so might people's clothes. With the help of fiber research at MIT, fabrics of the future could both hear and make noises.



A sample of the MIT piezoelectric fibers that shows their dimensions.
A sample of the MIT piezoelectric fibers that shows their dimensions. MIT

One edge of the fiber has more fluorine atoms running along it, and the other has more hydrogen atoms. This difference is responsible for the connection between the fibers' movement--whether caused by sound or causing it--and its electrical properties.

"Fabrics woven from piezoelectric fibers could be used as a communication transceiver," the researchers wrote, describing their approach in the July 11 issue of Nature Materials.

Sound isn't the only sensitivity possible with smarter fabrics. MIT also has worked on cameralike fibers sensitive to light.

The fibers aren't easy to make. They're produced from much larger cylinders that are "drawn" through a small aperture at higher temperatures. The MIT group managed the task using a number of techniques, including the use of an electrically conducting graphite-based plastic and a strong electric field to align necessary molecules.

Don't expect walking boom boxes anytime soon, though. Besides manufacturing and other practical constraints, the fibers today work only with kilohertz to megahertz sound frequencies, and humans employ much lower frequencies.

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