Journal
JOURNAL OF RENEWABLE AND SUSTAINABLE ENERGY
Volume 12, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5134103
Keywords
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Funding
- National Natural Science Foundation of China [51562023]
- Guangdong Provincial Key Laboratory of Emergency Test for Dangerous Chemicals [KF2018001]
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We wished to improve the thermophysical properties and thermal stability of meso-erythritol (ET) for storage of thermal energy. Hence, capsules containing ET with polysiloxane (pSiO) shells were fabricated using ultraviolet-assisted in situ polymerization, and the effects of encapsulation and additives doping on the thermophysical properties of ET were studied. Differential scanning calorimetry showed that the heat-release performance of the composite (pSiO-C-A@ET) upon addition of 3.0 wt. % carboxymethylcellulose (CMC) and 9.0 wt. % nano-alpha-Al2O3 increased significantly from 64.1% to 89.0%, and the supercooling degree decreased dramatically from 89.5 degrees C to 17.0 degrees C, compared with that of pure ET. Spectroscopy (Fourier transform-infrared, x-ray diffraction) implied no change in the crystal structure of ET after encapsulation by pSiO shells. Addition of a nucleation agent (nano-alpha-Al2O3) and thickening agent (CMC) had no effect on the crystal structure of pSiO-C-A@ET. The thermal conductivity of pSiO@ET and pSiO-C-A@ET capsules increased by 6.2% and 20.0% compared with that of pure ET (0.65 W/m center dot K) at 25 degrees C, respectively. The thermal conductivity was enhanced noticeably by doping with nano-alpha-Al2O3. Results from accelerated thermal cycling suggested that pSiO@ET and pSiO-C-A@ET capsules exhibited good thermal stability and thermal durability. These data suggest that composite phase-change materials could be employed for applications involving storage of thermal energy.
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