WITHDRAWN: Development and thermophysical investigation of stable fatty acid/SiO2 composite microcapsules through interfacial polycondensation

Abstract

Developing highly capable energy storage materials is crucial for efficient thermal energy storage and utilization. Microencapsulated lauryl alcohol (LA) as phase change material (PCM) using SiO2 shell was prepared through a novel one-pot synthesis of interfacial polycondensation using tetraethyl orthosilicate (TEOS) as shell precursor. The chemical composition of the microcapsules was examined through Fourier transforms infrared spectroscopy (FT-IR). The thermal properties were analyzed through differential scanning calorimetry (DSC), which reveals that the melting and freezing points of microcapsules were 23 oC and 18.9 oC, respectively. For melting and freezing, the estimated latent heats were 90 Jg− 1 and 88.2 Jg− 1, respectively. Thermogravimetric (TG) analysis confirms that the microcapsules are stable at a higher temperature. Besides, the leak test of the developed microcapsules was performed to investigate the stability during the melting process. Moreover, the prepared microcapsules (MPCM2) show stable and excellent thermophysical properties after 500 thermal cycles, which shows that the developed microcapsule is an ideal candidate for thermal energy storage.