How to improve the thermal conductivity of phase change materials (PCMs) is always the key to thermal control technology. At present, the thermal conductivity of PCMs has two ways to improve: one is to fill the matrix with high thermal conductivity and the other is to fill nanoparticles. After combining the two methods, the choice of filled nano-SiO2, carbon nanotubes (CNTs), or graphene (GNPs) has different effects on the performance of carbon-based energy storage composites. Filling paraffin with foamed carbon increased the thermal conductivity of pure paraffin from 0.25 W/(m·K) to 8.3083 W/(m·K), an increase of 33.2 times. When the nanoparticle mass fraction is 5%, the enthalpy of GNP composites is 10 J·g-1 less than that of SiO2 composites. Under the same mass fraction, compared with the thermal conductivity enhancement effect of SiO2 composites, the thermal conductivity increase effects of CNTs and GNP composites are 6.7 and 15.8 times the thermal conductivity increase of SiO2 composites, respectively. The comparison of theoretical and experimental values shows that different nanoparticle forms and dispersion modes have different effects on the performance of carbon-based energy storage composites, among which GNPs have the greatest improvement in the thermal conductivity of carbon-based composites.

中文翻译：

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纳米填充颗粒形式和分散模式对碳基储能复合材料性能的影响

如何提高相变材料（PCMs）的热导率一直是热控技术的关键。目前，PCMs的导热性有两种提高方式：一是填充高导热性的基体，二是填充纳米颗粒。两种方法结合后，填充纳米SiO2、碳纳米管（CNTs）或石墨烯（GNPs）的选择对碳基储能复合材料的性能有不同的影响。用泡沫炭填充石蜡使纯石蜡的导热系数从0.25 W/(m·K)提高到8.3083 W/(m·K)，提高了33.2倍。当纳米颗粒质量分数为5%时，GNP复合材料的焓比SiO2复合材料小10 J·g-1。在相同质量分数下，与SiO2复合材料的热导率增强效果相比，CNTs和GNP复合材料的热导率增加效果分别是SiO2复合材料热导率增加的6.7倍和15.8倍。理论值和实验值的对比表明，不同的纳米颗粒形态和分散方式对碳基储能复合材料的性能有不同的影响，其中GNPs对碳基复合材料的热导率提高幅度最大。