Abstract
Microencapsulated phase change materials (MePCMs) were fabricated via sol–gel synthesis, with nano-SiO2 acting as shell, lauric acid (LA) and myristic acid (MA) binary eutectic mixture as core materials, and then MePCMs were incorporated in gypsum. The thermal performances of LA-MA@nano-SiO2 MePCM as well as MePCM based gypsum board were systematically analyzed. The results show that the absorbed LA-MA is distributed uniformly in the pores and shows optimum homogenous morphology, which can significantly improve the thermal stability and durability. The heat absorption and release rate of the LA-MA/nano-SiO2 MePCM is enhanced compared with LA-MA eutectic mixture. When the core–shell ratio was 1:1, the encapsulation rate of LA-MA/nano-SiO2 MePCM is the highest, and relatively the melting heat as well as the solidification heat is the highest, with the leakage rate of LA-MA/nano-SiO2 MePCM controlled under less than 6 % after 200 times hot and cold cycle. Incorporating LA-MA@nano-SiO2 MePCM into gypsum acts properly in temperature control and postpones the temperature fluctuation.
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