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首页> 外文期刊>ACS Omega >Thermal Properties and Enhanced Thermal Conductivity of Capric Acid/Diatomite/Carbon Nanotube Composites as Form-Stable Phase Change Materials for Thermal Energy Storage
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Thermal Properties and Enhanced Thermal Conductivity of Capric Acid/Diatomite/Carbon Nanotube Composites as Form-Stable Phase Change Materials for Thermal Energy Storage

机译：热性能和增强癸酸/硅藻土/碳纳米管复合材料的热导电，作为用于热能储存的形成稳定相变材料

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摘要

The capric acid (CA)/diatomite (DT)/carbon nanotube (CNT) ternary system was investigated to develop a shape-stabilized composite phase change material for thermal energy storage via the direct impregnation method. DT was used as the supporting material to absorb CA and prevent its leakage. It was found that good form stability could be obtained when the loading of capric acid in the CA/DT composite reached about 54%. Furthermore, CNTs were added into the CA/DT form-stable phase change material (FSPCM) to enhance the thermal conductivity of the binary system. Moreover, the X-ray diffraction, scanning electron microscopy, and Fourier transform infrared spectroscopy analyses were carried out to characterize the microstructure and chemical properties of the composite PCM. The thermal properties of the prepared form-stable phase change materials (FSPCMs) were determined using differential scanning calorimetry (DSC) and thermogravimetric analyses. The analysis results showed that the components of the FSPCMs were in good compatibility and CA is well-infiltrated into the structure of the DT/CNT matrix. DSC analysis indicated that the latent heat of fusion of the ternary system was 79.09 J g–1 with a peak melting temperature of 31.38 °C. The thermal conductivity of the CA/DT/CNTs increased from 0.15 to 0.48 W m–1 K–1, with only 7 wt % of CNTs. It is shown that the thermal conductivity of the ternary system was greatly enhanced by the addition of CNTs. The thermal conductivity increased by 1.56 times compared to that of the binary system. Moreover, the enhancing mechanisms of heat conduction transfer by CNTs were revealed by taking advantage of energy wave theory.
机译：研究了癸酸（Ca）/硅藻土（DT）/碳纳米管（CNT）三元体系以通过直接浸渍方法开发用于热能储存的形状稳定的复合相变材料。 DT被用作吸收CA的支撑材料并防止其泄漏。发现当Ca / DT复合材料中的癸酸达到约54％时，可以获得良好的形式稳定性。此外，将CNT加入到Ca / DT形状稳定的相变材料（Fspcm）中以增强二元系统的导热率。此外，进行了X射线衍射，扫描电子显微镜和傅里叶变换红外光谱分析，以表征复合PCM的微观结构和化学性质。使用差示扫描量热法（DSC）和热重分析测定制备的形式稳定相变材料（FSPCMS）的热性质。分析结果表明，FSPCM的组分处于良好的相容性，Ca渗透到DT / CNT基质的结构中。 DSC分析表明，三元体系融合的潜热为79.09JG-1，峰熔化温度为31.38°C。 Ca / dT / CNT的导热率从0.15升增加0.15至0.48W m-1 k-1，只有7wt％的CNT。结果表明，通过加入CNT大大提高了三元系统的导热率。与二元系统相比，导热率增加1.56倍。此外，通过利用能量波理论，揭示了CNT的增强机制通过CNT进行了揭示。

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