Modified sepiolite stabilized stearic acid as a form-stable phase change material for thermal energy storage  

作　　者：Chuanchang Li Xinke Peng Jianjun He Jian Chen 

机构地区：[1]Key Laboratory of Renewable Energy Electric-Technology of Hunan Province,School of Energy and Power Engineering,Changsha University of Science and Technology,Changsha 410114,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2023年第9期1835-1845,共11页矿物冶金与材料学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (No.52274252);the Special Fund for the Construction of Innovative Provinces in Hunan Province,China (Nos.2020RC3038 and 2022WK4004);the Changsha City Fund for Distinguished and Innovative Young Scholars,China (No.kq1802007)。

摘　　要：Sepiolite(ST) was used as a supporting matrix in compiste phase change materials(PCMs) due to its unique microstructure, good thermal stability, and other raw material advantages. In this paper, microwave acid treatment were innovatively used for the modification of sepiolite. The modified sepiolite(ST_(m)) obtained in different hydrochloric acid concentrations(0.25, 0.5, 0.75, and 1.0 mol·L^(-1)) was added to stearic acid(SA) via vacuum impregnation method. The thermophysical properties of the composites were changed by varying the hydrochloric acid concentration. The SA-ST_(m0.5)obtained by microwave acid treatment at 0.5 mol·L^(-1)hydrochloric acid concentration showed a higher loading capacity(82.63%) than other composites according to the differential scanning calorimeter(DSC) analysis. The melting and freezing enthalpies of SA-ST_(m0.5)were of 152.30 and 148.90 J·g^(-1), respectively. The thermal conductivity of SA-ST_(m0.5)was as high as 1.52 times that of pure SA. In addition, the crystal structure, surface morphology, and microporous structure of ST_(m)were studied, and the mechanism of SAST_(m0.5)performance enhancement was further revealed by Brunauere Emmett Teller(BET) analysis. Leakage experiment showed that SAST_(m0.5)had a good morphological stability. These results demostrate that SA-ST_(m0.5)has a potential application in thermal energy storage.

关 键 词：SEPIOLITE stearic acid phase change materials thermal energy storage 

分 类 号：TB34[一般工业技术—材料科学与工程]