Microencapsulated myristic acid-fly ash with TiO2 shell as a novel phase change material for building application

Abstract

The microencapsulated myristic acid with titanium dioxide (TiO2) shell as shape-stabilized thermal energy storage materials was prepared using sol-gel method. The XRD and FT-IR techniques results presented that characteristic peaks of both myristic acid and TiO2 can be observed in the microencapsulated myristic acid with TiO2 shells. The phase change temperature, latent heat and thermal stability were investigated by a differential scanning calorimetry (DSC) and thermogravimetric analyzer (TGA). According to these results, the melting and freezing temperatures of the MPCM/TiO2 shell and MPCM/TiO2 shell-fly ash are 56.95 and 52.22 A degrees C; 47.56 and 26.68 A degrees C and the latent heats of melting and freezing are 96.64 kJ kg(-1); 97.72 and 23.43 kJ kg(-1); and 22.57 kJ kg(-1), respectively. TGA results certified that the addition of fly ash improved thermal stability. In particular, MPCM/TiO2 shell displays good thermal reliability after 1000 repeated melting/freezing cycling.