Giant room-temperature barocaloric effects in PDMS rubber at low pressures

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Abstract
The barocaloric effect is still an incipient scientific topic, but it has been attracting an increasing attention in the last years due to promising perspectives for application in alternative cooling devices. Here, we present giant values of barocaloric entropy change and temperature change induced by low pressure changes in the PDMS elastomer around room temperature. We report an entropy change of 69 J kg-1 K-1 for a pressure change of 130 MPa; and temperature changes of 12.0 K and 28.5 K, for pressure changes of 173 MPa and 390 MPa, respectively. A huge normalized temperature change of ~70 K GPa-1 was observed in a large temperature range. We found barocaloric effect values that exceed those previously reported for any promising barocaloric materials around room temperature. Our results stimulate the study of the barocaloric effect in elastomer polymers and broaden the pathway to use this effect in solid-state cooling technologies.

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