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Wax-filled nanotech yarn behaves like powerful, super-strong muscle
Date:11/15/2012

that introducing coiling to the nanotube yarn increases tenfold the yarn's thermal expansion coefficient. This thermal expansion coefficient is negative, meaning that the unfilled yarn contracts as it is heated. Heating the yarn in inert atmosphere from room temperature to about 2,500 degrees Celsius provided more than 7 percent contraction when lifting heavy loads, indicating that these muscles can be deployed to temperatures 1000 C above the melting point of steel, where no other high-work-capacity actuator can survive.

"This greatly amplified thermal expansion for the coiled yarns indicates that they can be used as intelligent materials for temperature regulation between 50 C below zero and 2,500 C," said Dr. Mrcio Lima, a research associate in the NanoTech Institute at UT Dallas who was co-lead author of the Science paper with graduate student Na Li of Nankai University and the NanoTech Institute.

"The remarkable performance of our yarn muscle and our present ability to fabricate kilometer-length yarns suggest the feasibility of early commercialization as small actuators comprising centimeter-scale yarn length," Baughman said. "The more difficult challenge is in upscaling our single-yarn actuators to large actuators in which hundreds or thousands of individual yarn muscles operate in parallel."


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Contact: Amanda Siegfried
amanda.siegfried@utdallas.edu
972-883-4335
University of Texas at Dallas
Source:Eurekalert

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