Preparation and thermal characterization of oxalic acid dihydrate/bentonite composite as shape-stabilized phase change materials for thermal energy storage

17th IUMRS International Conference in Asia

Han, Lipeng^1,2 ; Xie, Shaolei^1 ; Sun, Jinhe^1 ; Jia, Yongzhong^1

Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining

810008, China^1

University of Chinese, Academy of Sciences, Beijing

100049, China^2

关键词: Capillary force;    Confined crystallization;    Oxalic acid dihydrate;    Phase change enthalpy;    Phase transition enthalpy;    Shape stabilized phase change material;    Shape-stabilized;    Thermal characterization;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/182/1/012010/pdf
DOI  :  10.1088/1757-899X/182/1/012010

来源: IOP

【 摘 要 】

Oxalic acid dihydrate (OAD) which has very high initial phase transition enthalpy is a promising phase change material (PCM). In this paper, shape-stabilized composite PCMs composed of OAD and bentonite were prepared by a facile blending method to overcome the problem of leakage. FT-IR results indicated the interactions between OAD and bentonite, such as the capillary force and the hydrogen bonding, resulting in the confined crystallization process. As a result, the OAD was confined to be amorphous. The thermogravimetric analysis and scanning electron microscope results showed that sample had the best coating effect when the amount of bentonite was 17.7%. The differential scanning calorimetry analyses demonstrated that a decrease in the OAD content was accompanied by a continuous decrease in the melting point and phase change enthalpy of the composites.