Song Xiaofei, Cai Yibing, Huang Cong, Gu Ying, Zhang Junhao, Qiao Hui, Wei Qufu
Key Laboratory of Eco-Textiles, Ministry of Education, Jiangnan University, Wuxi, Jiangsu 214122, People's Republic of China.
School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212003, People's Republic of China.
J Nanosci Nanotechnol. 2018 Apr 1;18(4):2723-2731. doi: 10.1166/jnn.2018.14361.
A novel form-stable phase change materials (FSPCMs) was fabricated by incorporating fatty acid eutectics with electrospun carbon nanofibers (CNFs) surface-attached with copper (Cu) nanoparticles. Three different Cu/CNFs mats were made through combining the technique and principle of electrospinning, pre-oxidation/carbonization and in-situ reduction, while lauric-myristic-stearic acid (LA-MA-SA) ternary eutectic mixture was prepared as the model PCM. The morphology and crystal structure of Cu/CNFs were characterized by Fourier transfer infrared (FT-IR) spectra, Scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray energy dispersive spectroscopy (EDS), respectively. The results showed that Cu nanoparticles dispersed uniformly on the surface of CNFs mats without agglomeration, and Cu/CNFs mats could provide the mechanical support for FSPCMs and effectively prevent the flow/leakage of molten fatty acid. Morphological structures, as well as the properties of thermal energy storage and thermal energy storage/retrieval rates, of the resulting FSPCMs were investigated by SEM, Differential scanning calorimetry (DSC), and measurement of melting/freezing times, respectively. The results indicated that the fabricated FSPCMs exhibited desired structural morphology, and LA-MA-SA well dispersed in three-dimensional porous structure of Cu/CNFs mats. The melting and crystallization enthalpies of the fabricated FSPCMs were in the range of 117.1-140.7 kJ/kg and 117.2-142.4 kJ/kg, respectively. In comparison with melting/freezing times of LA-MA-SA ternary eutectic mixture, the melting/freezing times of fabricated FSPCMs were respectively decreased ~27.0-49.2% and ~44.1-63.0%. The fabricated FSPCMs possessed good thermal energy storage/retrieval property, and might have great potential for renewable energy storage applications.
通过将脂肪酸低共熔物与表面附着有铜（Cu）纳米颗粒的电纺碳纳米纤维（CNF）相结合，制备了一种新型的形状稳定相变材料（FSPCM）。通过结合静电纺丝、预氧化/碳化和原位还原的技术与原理，制备了三种不同的Cu/CNF毡，同时制备了月桂酸-肉豆蔻酸-硬脂酸（LA-MA-SA）三元低共熔混合物作为模型相变材料。分别通过傅里叶变换红外（FT-IR）光谱、扫描电子显微镜（SEM）、X射线衍射（XRD）和X射线能量色散光谱（EDS）对Cu/CNF的形态和晶体结构进行了表征。结果表明，Cu纳米颗粒均匀分散在CNF毡表面，无团聚现象，且Cu/CNF毡可为FSPCM提供机械支撑，并有效防止熔融脂肪酸的流动/泄漏。分别通过SEM、差示扫描量热法（DSC）以及熔融/凝固时间测量，对所得FSPCM的形态结构、储热性能和储热/放热速率进行了研究。结果表明，所制备的FSPCM呈现出所需的结构形态，且LA-MA-SA很好地分散在Cu/CNF毡的三维多孔结构中。所制备的FSPCM的熔融焓和结晶焓分别在117.1-140.7 kJ/kg和117.2-142.4 kJ/kg范围内。与LA-MA-SA三元低共熔混合物的熔融/凝固时间相比，所制备的FSPCM的熔融/凝固时间分别缩短了约27.0-49.2%和约44.1-63.0%。所制备的FSPCM具有良好的储热/放热性能，在可再生能源存储应用中可能具有巨大潜力。
