Abstract The barocaloric effect is still an incipient scientific topic, but it has been attracting an increasing attention in the last years due to the promising perspectives for its application in alternative cooling devices. Here, we present giant values of barocaloric entropy change and temperature change induced by low pressures in PDMS elastomer around room temperature. Adiabatic temperature changes of 12.0 K and 28.5 K were directly measured for pressure changes of 173 MPa and 390 MPa, respectively, associated with large normalized temperature changes (∼70 K GPa−1). From adiabatic temperature change data, we obtained entropy change values larger than 140 J kg−1 K−1. We found barocaloric effect values that exceed those previously reported for any promising barocaloric materials from direct measurements of temperature change around room temperature. Our results stimulate the study of the barocaloric effect in elastomeric polymers and broaden the pathway to use this effect in solid-state cooling technologies.

中文翻译：

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PDMS 橡胶在低压下的巨大室温压力热效应

摘要 气压热效应仍然是一个新兴的科学课题，但由于其在替代冷却设备中的应用前景，它在过去几年中引起了越来越多的关注。在这里，我们展示了室温附近 PDMS 弹性体中低压引起的压力热熵变化和温度变化的巨大值。对于 173 MPa 和 390 MPa 的压力变化，直接测量了 12.0 K 和 28.5 K 的绝热温度变化，这与大的归一化温度变化（~70 K GPa-1）相关。从绝热温度变化数据中，我们获得了大于 140 J kg-1 K-1 的熵变值。通过直接测量室温附近的温度变化，我们发现压力热效应值超过了先前报告的任何有希望的压力热材料的压力热效应值。我们的结果刺激了对弹性聚合物中压力热效应的研究，并拓宽了在固态冷却技术中使用这种效应的途径。