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Plastic that changes shape with light







Plastic that changes shape with light

Plastic that changes shape with light 04/14/2005 03:48 PM

David Pescovitz: Shape memory alloy, materials that change shape based on a temperature increase, are old news for roboticists. But MIT scientists have developed a new plastic that shapeshifts in response to light. From the MIT News Office:

 Images  Images  Newsoffice
2005 Smart-Plastic-Enlarged These programmed materials change shape when struck by light at certain wavelengths and return to their original shapes when exposed to light of specific different wavelengths.

The discovery, to be reported in the April 14 issue of Nature, could have potential applications in a variety of fields, including minimally invasive surgery. Imagine, for example, a "string" of plastic that a doctor could thread into the body through a tiny incision. When activated by light via a fiber-optic probe, that slender string might change into a corkscrew-shaped stent for keeping blood vessels open.
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