A sodium nitrate (NaNO3)/silica (SiO2) composite was prepared as a shape-stabilized phase change material by a sol gel procedure. In this composite, NaNO3 acted as the phase change material and SiO2 was used as the supporting material. The maximal weight percentage of NaNO3 in the composite was determined to be 60 wt.%. The chemical composition, morphology, structure and thermal properties were investigated by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), thermal gravimetric analysis (TGA), differential scanning calorimeter (DSC) and Laser thermal conductivity meter. The DSC results indicated that the enthalpies of melting and freezing of the NaNO3/SiO2 (60 wt.% NaNO3) composite were 108 kJ/kg and 110 kJ/kg, and the corresponding temperatures of the phase transition were 302 C and 300 C, respectively. In the temperature range of lower than 500 C the phase change enthalpy of the composite was increased with the increase of the roasting temperature.
Compounds
#
Formula
Name
1
NNaO3
sodium nitrate
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.
Type
Compound-#
Property
Variable
Constraint
Phase
Method
#Points
POMD
1
Molar enthalpy of transition or fusion, kJ/mol ; Crystal