材料科学
热导率
制冷
制冷剂
复合数
塑料晶体
复合材料
石墨
相变
纳米技术
热力学
热交换器
物理
作者
Zhaofeng Dai,Bohan Shao,Qicheng Chen,Yulong Ding,Yongliang Li,Muxing Zhang,Ershuai Yin,Xiaohui She,Xiaosong Zhang,Dongliang Zhao
标识
DOI:10.1002/adfm.202307822
摘要
Abstract Plastic crystal neopentyl glycol (NPG) displays a colossal barocaloric effect akin to conventional refrigerants, rendering it as a highly promising solid‐state refrigerant. However, its practical application is restricted by its elevated phase transition temperature, inferior thermal conductivity, and weak mechanical response. Herein, a molecular design strategy is employed, wherein NPG molecules are substituted with trimethylolpropane (TMP) molecules, resulting in the successful synthesis of novel plastic crystals, designated as NPG 0.75 TMP 0.25 , with a phase change temperature of 283.7 K. To enhance the thermal conductivity, a dual encapsulation strategy is utilized to fabricate a highly oriented thermally conductive hybrid network composed of NPG 0.75 TMP 0.25 and expanded graphite (EG) by using melt adsorption and pressure induction. The hybrid networks also significantly augment the mechanical properties of NPG 0.75 TMP 0.25 . The resulting composite barocaloric material exhibits a maximum entropy change of 223.8 J K −1 kg −1 achieved under pressure changes below 40 MPa and a thermal conductivity of 18.31 W m −1 K −1 . Moreover, the composite exhibits high mechanical response and fatigue resistance. This study not only demonstrates the potential of composite barocaloric materials for practical applications but also significantly advances the engineering of barocaloric refrigeration.
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