Su Xiu, Zhang Zhipeng, Liu Jun, Zheng Qiang, Li Zhenxing, Shen Jun, Li Bing, Du Juan
Institute of Materials, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, People's Republic of China.
Department of Energy and Power Engineering, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China.
J Phys Chem Lett. 2024 Feb 22;15(7):1962-1968. doi: 10.1021/acs.jpclett.3c03124. Epub 2024 Feb 12.
Refrigeration technology based on the caloric effect is one of the more environmentally friendly alternatives to gas compression refrigeration. The barocaloric effect utilizes pressure to induce phase transition and results in a large entropy change. In this work, a colossal barocaloric effect in the liquid-solid transition (L-S-T) of binary fatty acid methyl esters (BFAMEs) was discovered. At 295 K, an isothermal entropy change as high as 591 J kg K and a reversible entropy change of 356 J kg K at a hydrostatic pressure of 80 MPa were obtained by mixing methyl palmitate and methyl stearate with a specific ratio to synthesize a BFAME. The value of the isothermal entropy change of the BFAME is comparable to that of a commercial gas compression refrigerant, R134a. This work will provide a new L-S-T candidate material to replace commercial refrigerants for the potential application of caloric effect refrigeration technology.
基于热效应的制冷技术是气体压缩制冷较为环保的替代方案之一。压热效应利用压力诱导相变并导致较大的熵变。在这项工作中，发现了二元脂肪酸甲酯（BFAMEs）在液-固转变（L-S-T）中存在巨大的压热效应。在295K时，通过将棕榈酸甲酯和硬脂酸甲酯按特定比例混合合成一种BFAME，在80MPa的静水压力下获得了高达591J kg K的等温熵变和356J kg K的可逆熵变。BFAME的等温熵变值与商用气体压缩制冷剂R134a相当。这项工作将为热效应制冷技术的潜在应用提供一种新的L-S-T候选材料，以替代商用制冷剂。
