Effects of copper nanowires on the properties of an organic phase change material

• Published in: Solar energy materials and solar cells Vol. 105; pp. 174 - 178
• Main Authors: Zeng, Ju-Lan, Zhu, Fu-Rong, Yu, Sai-Bo, Zhu, Ling, Cao, Zhong, Sun, Li-Xian, Deng, Guang-Rong, Yan, Wen-Pei, Zhang, Ling
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.10.2012; Elsevier
• Subjects: Applied sciences; COMPOSITES; Copper; Copper nanowires; Electrical engineering. Electrical power engineering; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Heat transfer; Materials; Melting; MICROWIRE; Nanowires; ORGANIC COMPOUNDS; Phase change; Phase change materials; PHASE TRANSFORMATIONS; PHASES; Solar energy; SOLAR POWER; Thermal conductivity; Thermal energy storage; Transport and storage of energy; Phase change materials; Thermal energy storage; Thermal conductivity; Copper nanowires; Phase change; Enthalpy; Machining; Composite material; Phase transformation; Three dimensional structure; Organic material; PCM material; Nanowires; Copper
• ISSN: 0927-0248; 1879-3398
• DOI: 10.1016/j.solmat.2012.06.013

The effects of copper nanowires (Cu NWs) with ultra-high aspect ratio and sponge-like structure on the properties of an organic phase change material (PCM) were investigated. Tetradecanol (TD) was selected as the organic PCM. The sponge-like Cu NWs clusters were randomly dispersed in the TD matrix and were wrapped by TD to form a new kind of composite PCM. The phase change enthalpy (ΔH) of the composite PCMs was decreased linearly with the increasing of Cu NWs loading, while the melting speed was accelerated. The thermal conductivity of the composite PCMs was greatly enhanced by Cu NWs. The ΔH of the composite PCM containing 58.9wt% (corresponding to 11.9vol%) of Cu NWs was 86.95J/g, and the thermal conductivity attained to 2.86W/mK, which was nearly 9 times higher than that of the TD. The thermal conductivity enhancement of Cu NWs on the composite PCMs showed a turning point at the Cu NWs loading of 1.5vol%. When Cu NWs loading exceeded 1.5vol%, the thermal conductivity of the composite PCMs increased significantly faster with the increasing of Cu NWs loading. [Display omitted] ► Copper nanowires are used as thermal conductive filler for an organic PCM. ► The thermal conductivity of the composite PCM is enhanced 9 times. ► The curve of thermal conductivity vs. copper NWs loadings shows a turning point. ► Copper nanowires are stable in the composite PCM.