Non-isothermal crystallization behavior of Ag nanoparticles modified expanded graphite/paraffin composite phase change material. (February 2023)

• Record Type: Journal Article
• Authors: Wen, Ruilong; Wu, Maomao; Chen, Bojun; Chen, Weixing
• Is Part Of: Journal of energy storage. Volume 58(2023)
• Publication Date: 2023-02
• Subjects: Non-isothermal crystallization -- Paraffin -- Expanded graphite -- Ag nanoparticle; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2022.106371
• Languages: English
• ISSNs: 2352-152X

Abstract

Abstract: The thermal conductivity enhancement fillers and supporting material have significant influence on the crystallization process of phase change materials (PCMs) in composite PCMs. In this work, the non-isothermal crystallization behavior of Ag nanoparticles modified expanded graphite/paraffin (AEP) composited PCMs was studied to analyze the effect of expanded graphite (EG) and Ag nanoparticles on the crystallization process of paraffin wax (PW). The results showed that non-isothermal crystallization parameters of t 1/2 and F(T) and activation energy of 0-AEP was lower than those of PW, indicating that the crystal growth and nucleation of PW were accelerated by EG. After Ag nanoparticles were modified, the t 1/2 and F(T) and the activation energy of AEP were increased which were higher than that of 0-AEP but still lower than that of pure PW, revealing that the crystal growth and nucleation of PW were restricted by the surface interaction between Ag and PW. The non-isothermal crystallization analysis results provide a valuable reference for deeply understanding phase change behavior and kinetics of the CPCMs. Highlights: The non-isothermal crystallization behavior of AEP was clearly clarified. EG accelerated the nucleation and crystal growth process of PW in 0-AEP. Ag nanoparticles restricted the nucleation and crystal growth of PW in composite PCMs.