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Synthesis and thermal properties of a capric acid-modified expanded vermiculite phase change material

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Abstract

A new capric acid (CA)-modified vermiculite composite phase change material (PCM) with improved adsorption ability and enhanced thermal stability was prepared in the present research. The silanization vermiculite (SV) obtained by two-step acidification and silanization treatment was used as the CA-supporting matrix. The differential scanning calorimeter detected the fusion enthalpy of CA–SV composite as 118.41 J/g, which was 37.1% higher than that of CA-expanded vermiculite (EV). The phase conversion rate (α)–temperature (T) curves and the dα/dT-α curves revealed that the phase transition hysteresis phenomenon of the CA–SV composite was more conspicuous than that of CA–EV. It was also found that the fusion enthalpy loss of CA–SV was 3.1% after 1000 thermal cycles. Therefore, it can be concluded that the CA–SV composite PCM with enhanced containment ability and improved thermal stability is a promising candidate for thermal energy storage applications.

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Authors and Affiliations

  1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, People’s Republic of China

    Hongguang Zhang, Jiaoqun Zhu, Weibing Zhou, Fengli Liu & Kang Li

  2. School of Material Science and Engineering, Wuhan University of Technology, Wuhan, 430070, People’s Republic of China

    Hongguang Zhang, Jiaoqun Zhu, Weibing Zhou, Fengli Liu & Kang Li

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  1. Hongguang Zhang
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  2. Jiaoqun Zhu
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  4. Fengli Liu
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  5. Kang Li
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Correspondence to Jiaoqun Zhu.

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Zhang, H., Zhu, J., Zhou, W. et al. Synthesis and thermal properties of a capric acid-modified expanded vermiculite phase change material. J Mater Sci 54, 2231–2240 (2019). https://doi.org/10.1007/s10853-018-2988-7

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  • DOI: https://doi.org/10.1007/s10853-018-2988-7

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