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The effect of hydrophilic modification of expanded graphite on the thermophysical properties of magnesium chloride hexahydrate

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Abstract

Magnesium chloride hexahydrate, as a phase change materials, is investigated usually to store solar energy. Here, the effect of hydrophilic modification of expanded graphite with Triton X-100 on the thermophysical properties of magnesium chloride hexahydrate was presented. Differential scanning calorimetry, scanning electron microscope, Fourier transform infrared spectroscopy and thermal gravimetric analysis, etc., were used. The magnesium chloride hexahydrate/hydrophilic expanded graphite composite phase change materials had more excellent thermal characteristics than magnesium chloride hexahydrate/expanded graphite composite phase change materials and pure magnesium chloride hexahydrate. The results showed that hydrophilic expanded graphite could better promote the endothermic and exothermic properties of magnesium chloride hexahydrate. After hydrophilic modification, the composites with higher melting enthalpy, better thermal conductivity and less supercooling were obtained. And the leakage test demonstrated that the hydrophilic modification of expanded graphite can reduce the leakage of magnesium chloride hexahydrate powerfully.

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Acknowledgements

The work was supported by the National Key R&D Program of China (No. 2018YFC1903804-02), National Natural Science Foundation of China (20901082, U1407205) and Youth innovation Promotion Association of CAS (2015351).

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Author notes

  1. Yecheng Qian and Yue Zhang have contributed equally to this work.

Authors and Affiliations

  1. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, 810008, China

    Yecheng Qian, Yue Zhang, Jinhe Sun, Yan Jing, Fei Shao & Yongzhong Jia

  2. Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources, Xining, 810008, China

    Yecheng Qian, Yue Zhang, Jinhe Sun, Yan Jing, Fei Shao & Yongzhong Jia

  3. University of Chinese Academy of Sciences, Beijing, 100049, China

    Yue Zhang

  4. Qinghai University, Xining, 810008, China

    Yecheng Qian, Chao Song & Zhengyuan Tao

  5. Qinghai Salt Chemicals Supervision and Inspection Center, Geermu, 816099, China

    Jinhe Sun, Xingquan Wang & Hong Liu

Authors
  1. Yecheng Qian
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  2. Yue Zhang
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  10. Hong Liu
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Correspondence to Jinhe Sun or Yongzhong Jia.

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Qian, Y., Zhang, Y., Sun, J. et al. The effect of hydrophilic modification of expanded graphite on the thermophysical properties of magnesium chloride hexahydrate. J Therm Anal Calorim 140, 1725–1735 (2020). https://doi.org/10.1007/s10973-019-08942-x

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  • DOI: https://doi.org/10.1007/s10973-019-08942-x

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