Sol-gel synthesis and characterization of microencapsulated strontium titanate-myristic acid phase change material for thermal energy storage

In the present study, a novel strontium titanate-myristic acid (MA) microencapsulated phase change material in three different compositions was prepared by a simple sol-gel technique with strontium titanate as the shell and MA as the core material. The X-ray diffraction, Fourier-transformed infrared spectroscopy, and energy-dispersive X-ray spectroscopy confirm the formation of SrTiO 3 microencapsulated MA microcapsules. Differential scanning calorimetry analysis confirmed that among the three ratios examined, the (1:2) ratio microencapsulated MA@SrTiO 3 particles had a higher melting temperature of 53.41 °C and a latent heat of fusion of 91.90 J/g in comparison to its counterparts. The encapsulation ratio of 42% and efficiency of 46% has been achieved for the (1:2) ratio sample. Thermogravimetry results revealed excellent thermal endurance and stability owing to the presence of strontium titanate shell, demonstrating that the fabricated MA@SrTiO 3 has adequate potentials for thermal energy storage application. Highlights A novel strontium titanate-myristic acid microencapsulated phase change material was prepared by sol-gel method. The (1:2) microcapsules showed higher melting temperature of 53.41 °C and latent heat of 91.90 J/g. The (1:2) ratio of microcapsules showed an encapsulation ratio of 42%. The microcapsules showed higher thermal endurance owing to the presence of SrTiO 3 shell.