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Abstract In order to reduce the supercooling degree of disodium hydrogen phosphate dodecahydrate and improve its water loss problem,a composite phase change material (CPCM) was prepared by adsorbing disodium hydrogen phosphate dodecahydrate with SiO2 as carrier material in this paper. The effect of three nucleating agents on the supercooling degree of the CPCM was investigated through T-history method. The chemical structure and thermal properties of the CPCM were characterized. The results showed that using 5% sodium silicate nonahydrate as a nucleating agent could reduce the supercooling degree of the CPCM to 2.3 ℃. The Differential Scanning Calorimeter (DSC) results displayed that adding a certain amount of deionized water could effectively improve the water loss problem of the CPCM, with its phase transition temperature and latent heat were 35.1 ℃ and 152.5 J/g，respectively. The Fourier Infrared Spectrometer (FT-IR) results showed that there was only physical adsorption between SiO2 and disodium hydrogen phosphate dodecahydrate. The Thermo Gravimetric Analyzer (TG) results indicated that the CPCM had good thermal stability.
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Received: 15 February 2023
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2022, Vol. 35 
