Research Article

Torsional refrigeration by twisted, coiled, and supercoiled fibers

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Science  11 Oct 2019:
Vol. 366, Issue 6462, pp. 216-221
DOI: 10.1126/science.aax6182

Twisting is cool

Rubber bands that are stretched and held in an extended shape for a while will extract heat from their surroundings as they are allowed to relax, owing to a reversal of stress-induced crystallization, which is an exothermic process. Wang et al. examine the potential for solid-state cooling of twisted fibers, along with configurations such as supercoiling, for materials including natural rubber, polyethylene, and nickel-titanium fibers. The cooling is related to the change in entropy of the material as it is mechanically deformed.

Science, this issue p. 216

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