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Preparation and characterization of stearic acid/expanded graphite composites as thermal energy storage materials

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  • Fang, Guiyin
  • Li, Hui
  • Chen, Zhi
  • Liu, Xu

Abstract

Stearic acid/expanded graphite composites with different mass ratios were prepared by absorbing liquid stearic acid into the expanded graphite. In the composite materials, the stearic acid was used as the phase change material for thermal energy storage, and the expanded graphite acted as the supporting material. Fourier transformation infrared spectroscopy, X-ray diffraction, scanning electron microscopy and thermal diffusivity measurement were used to determine the chemical structure, crystalline phase, microstructure and thermal diffusivity of the composites, respectively. The thermal properties and thermal stability were investigated by differential scanning calorimetry and thermogravimetric analysis. The thermal analysis results indicated that the materials exhibited the same phase transition characteristics as the stearic acid and their latent heats were approximately the same as the values calculated based on the weight fraction of the stearic acid in the composites. The microstructural analysis results showed that the stearic acid was well absorbed in the porous network of the expanded graphite, and there was no leakage of the stearic acid from the composites even when it was in the molten state.

Suggested Citation

  • Fang, Guiyin & Li, Hui & Chen, Zhi & Liu, Xu, 2010. "Preparation and characterization of stearic acid/expanded graphite composites as thermal energy storage materials," Energy, Elsevier, vol. 35(12), pages 4622-4626.
    • Handle: RePEc:eee:energy:v:35:y:2010:i:12:p:4622-4626
    DOI: 10.1016/j.energy.2010.09.046
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