Preparation and characterization of SiO2 coated CaCl2·2H2O phase change nanocomposites
ZHOU Long-xiang1, LIU Yong1, ZHANG Li-zhen2, WU Zhao-yang2, WANG Bao-ming1, HUA Quan-xian1, LIU Li1, TANG Jian-wei1
1. National Research & Popularization Centre of Calcium Magnesium Phosphate Compound Fertilizer Technology, School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450001, China; 2. Zhengzhou Research Institute for Comprehensive Utilization of Mineral Resources, China Academy of Geological Sciences, Zhengzhou 450001, China
Abstract: Crystalline hydrated salts are a class of inorganic phase change energy storage materials,which cannot be practically applied due to phase separation,overcooling and the like problems.SiO2 coated CaCl2·2H2O phase change nano-composites are prepared by means of sol-gel method.The samples are characterized by XRD,EDS,SEM and TEM.DSC and STA analysis results indicate that the sample has good heat storage performance and thermal stability.The sample can be melted at 75.8℃ with a latent heat of 52.89 J·g-1.Thermal cycling experiments show that it has good thermal cycling properties.The phase separation and overcooling of the hydrated salt are effectively suppressed and mitigated due to the mesoporous confinement effect.
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