Abstract Latent heat thermal energy storage system using phase change materials was widely used in solar thermal systems. Here, a novel form-stable phase change composite was successfully prepared. The sebacic acid is encapsulated by carbon nanotube sponge. The as-prepared composite is determined by SEM, FT-IR and XRD and the results show that the paraffin is mostly encapsulated in the pores of carbon nanotube sponge. The DSC measurements indicate that the melting temperature and latent heat of the composite are 121.1 °C and 131.8 J g−1, respectively. The phase change composite could maintain its phase transition perfectly after 200 melting−freezing cycles, and no leakage of sebacic acid was observed by further SEM observation. The as-prepared composite shows 27-fold thermal conductivity enhancement as compared to the pure sebacic acid. Further, the as-prepared composite shows great photo-thermal performance when under simulated solar irradiation. Hence, the carbon nanotube sponge based high temperature phase change composite has great potential in solar thermal application.

中文翻译：

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具有优异导热性和光热性能的癸二酸/CNT海绵相变材料

摘要 利用相变材料的潜热蓄热系统在太阳能热系统中得到广泛应用。在这里，成功地制备了一种新型的形状稳定相变复合材料。癸二酸被碳纳米管海绵包裹。通过SEM、FT-IR和XRD对所制备的复合材料进行测定，结果表明石蜡大部分被包封在碳纳米管海绵的孔隙中。DSC 测量表明复合材料的熔化温度和潜热分别为 121.1 °C 和 131.8 J g-1。相变复合材料在 200 次熔化-冷冻循环后仍能完美地保持其相变，进一步扫描电镜观察未发现癸二酸泄漏。与纯癸二酸相比，所制备的复合材料的热导率提高了 27 倍。更多，所制备的复合材料在模拟太阳辐射下显示出良好的光热性能。因此，基于碳纳米管海绵的高温相变复合材料在太阳能热应用中具有巨大的潜力。