Stearic acid modified montmorillonite as emerging microcapsules for thermal energy storage
Abstract In order to obtain an efficient phase change material (PCM), emerging montmorillonite/stearic acid (Mt/SA) microcapsules containing SA core with Mt shell were designed and prepared via self-assembly of Mt in the SA emulsion. The Mt/SA microcapsules were coated with SiO 2 from the hydrolysis and polycondensation of TEOS to enhance the structure stability. The microstructure, thermal properties and reliability of Mt/SA microcapsules were investigated via scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). The Mt/SA microcapsules presented sphere-like particles and had a size distribution from 10 to 30μm. The freezing latent heat of the Mt/SA microcapsules was 118J/g at 52.3°C. The energy storage rate of the Mt/SA microcapsules was faster compared to SA. The Mt/SA microcapsules had excellent structural stability, high energy storage capacity and stable energy storage and release performances. The energy storage performances of the Mt/SA microcapsules were superior to the Mt/SA composites prepared via vacuum impregnation. Excellent energy storage reliability and capability of the Mt/SA microcapsules have advantages for solar energy storage fields. Highlights Montmorillonite/stearic acid/(Mt/SA) microcapsules were designed via self-assembly. Microcapsules were coated with the hydrolyzate SiO 2 to enhance the structure stability. Mt/SA presented spherical particles with a size distribution from 10 to 30μm. Mt/SA showed higher thermal storage and release rate with excellent stability. Graphical abstract [DISPLAY OMISSION]
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