Abstract
Phase change materials (PCMs) are widely used for their effectively thermal energy storage and conversion. Na2HPO4⋅12H2O (DHPD) is a promising inorganic PCM, as it possesses large heat enthalpy and suitable phase change temperature. Hexadecyl trimethyl ammonium chloride (CTAC) hydrophilic structure of composite PCM (CPCM) was formed, because of the poor sealing stability of expanded graphite (EG). Indeed, there is the solid intermolecular attraction between cations of CTAC and the water of DHPD, thereby improving the thermal characteristics. The heat enthalpy of EG/CTAC 0.1-DHPD (ECCD-0.1) CPCM was 299 J/g, and the thermal conductivity of ECCD-0.1 CPCM was 1.411 W/m⋅K. The ECCD-CPCMs showed a great cyclic stability which remained stable after 500 melting-solidification cycles.
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