Shaper,nylon synthetic

Nylon synthetic

The secret, according to a report published Wednesday to the journal Advanced Materials, lies in how the fibers are shaped and heated. See, nylon fibers have this weird natural property that, when you heat them, they contract in length but expand in diameter. That makes them ideal for linear movement, like lifting a weight straight up. But getting nylon to bend as it contracts is not as simple.

Typically, getting nylon to bend as it heats requires pulleys to take up the slack, which adds weight, complexity and cost to the system - the three exact things you want to avoid in creating a mass-produced technology. But the MIT team figured out a clever workaround. Using normal nylon filament, the team first compressed it to change the fiber's cross-section from circular to square. They then heated just one side of the fiber, causing it to contract faster than the unheated side and forcing the entire strand to bend. The heat source can be anything from electrical resistance to chemical reactions - even lasers. The fibers are surprisingly resilient, lasting for 100, 000 cycles and capable of contracting up to 17 times per second.

This breakthrough could lend itself to a wide variety of industrial and commercial applications. Like powered clothing that automatically contracts to your precise body shape, which means everything on the rack is in your size. These fibers could also be used in cars and airplanes. Remember that BMW GINA concept car with the adjustable "skin"? With these fibers, a vehicle's exterior could reshape itself on the fly to minimize drag. The technology could even lend itself to self-adjusting catheters for insulin pumps. And eventually, we may even see them in biomimetic robot muscles. Unfortunately, there's no word yet on how quickly these fibers will make it beyond MIT's labs.

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