2021
DOI: 10.1038/s41560-020-00770-w
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Elastocaloric heat pump with specific cooling power of 20.9 W g–1 exploiting snap-through instability and strain-induced crystallization

Abstract: Conventional refrigeration relies on hazardous agents, contributing to global warming. Soft, cheap, biodegradable solid-state elastocaloric cooling based on natural rubber offers an environmental friendly alternative. However, no such practical cooler has been developed, as conventional soft elastocaloric designs are not fast enough to ensure adiabaticity.In this work, we combine snap-through instability with strain-induced crystallization and achieve a sub-100 ms quasi-adiabatic cycling which is 30 times fast… Show more

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Cited by 96 publications
(54 citation statements)
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“…During the rapid snap-through, the membrane quasi-adiabatically heats by several degrees. 8 As it thermalizes back to room temperature, the elastomer softens proportionally, 17 slightly increasing the balloon volume, which can be seen in Figure 2b , after the point 3. The gas entering the balloon somewhat cools down semi-adiabatically, but the pressure corrections in Equations (3) and (4) remain small, as long as 1 .…”
Section: Resultsmentioning
confidence: 92%
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“…During the rapid snap-through, the membrane quasi-adiabatically heats by several degrees. 8 As it thermalizes back to room temperature, the elastomer softens proportionally, 17 slightly increasing the balloon volume, which can be seen in Figure 2b , after the point 3. The gas entering the balloon somewhat cools down semi-adiabatically, but the pressure corrections in Equations (3) and (4) remain small, as long as 1 .…”
Section: Resultsmentioning
confidence: 92%
“…If the balloon is inflated and deflated several times, the rubber membrane is cyclically loaded, revealing material-dependent effects. First, the elastomer membrane shows an intrinsic hysteresis due to stretch-induced crystallization, 8 , 18 so that different curves in the p - V plane are followed for inflation and deflation. 6 Furthermore, natural rubber softens appreciably during the first loading cycles ( Fig.…”
Section: Resultsmentioning
confidence: 99%
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“…Recently, flexible caloric films paved the way to an alternative paradigm. In the new generation of energy transducers, based on poly(vinylidene fluoride) (PVDF) electrocaloric and natural-rubber elastocaloric materials [45][46][47][48], regeneration is replaced by a cascade of devices, whereas heat transfer is dealt with through solid-solid direct contact, making heat exchange fluid and the pumps redundant.…”
Section: Discussionmentioning
confidence: 99%