PREPARATION AND PROPERTIES OF MODIFIED SEPIOLITE BASED COMPOSITE THERMAL STORAGE MATERIALS

Zhong Jinbao; Fan Haoxi; Wang Yongpeng; Zhang Jian; Meng Xiangyi; Feng Xianglong

doi:10.19912/j.0254-0096.tynxb.2024-1303

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (11) : 129-135. DOI: 10.19912/j.0254-0096.tynxb.2024-1303

PREPARATION AND PROPERTIES OF MODIFIED SEPIOLITE BASED COMPOSITE THERMAL STORAGE MATERIALS

Zhong Jinbao¹, Fan Haoxi^1,2, Wang Yongpeng¹, Zhang Jian¹, Meng Xiangyi¹, Feng Xianglong¹

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Abstract

Through physical modification methods such as washing, drying, and high-temperature calcination, sepiolite was treated to obtain modified sepiolite （ST）. Using the vacuum adsorption method, ST was used as the support to prepare a lauric acid （LA） and palmitic acid （PA） binary eutectic composite phase change materials, resulting in modified sepiolite-based lauric acid-palmitic acid composite phase change heat storage materials （LA-PA/ST）. The thermophysical properties, structural features, thermal conductivity and thermal reliability of the composite phase change materials （PCMs） were systematically investigated by testing methods such as differential scanning calorimeter （DSC）, Fourier transform infrared spectroscopy （FTIR）, scanning electron microscope （SEM） thermogravimetric analyzer （TG）, HotDisk analyzer and thermal cycling experiments. The results indicated that at an optimal adsorption mass ratio of LA-PA to ST of 1:5, LA-PA was uniformly distributed within the pores of ST and showed no leakage in the molten state. The thermal conductivity of pure LA-PA is 0.29 W/（m·K）, whereas that of LA-PA/ST increases significantly to 1.26 W/（m·K）. Additionally, the composite exhibited nearly no weight loss at 100 ℃, with initial 1% weight loss occurring at 128.36 ℃. After 200 thermal cycling experiments, the phase change temperature decreased by only 0.03 ℃. An experimental setup was constructed to evaluate the photothermal conversion performance, revealing a 461 s reduction in heat storage time and a 1711 s extension in heat release time. These experimental data demonstrate that LA-PA/ST possesses good thermal conductivity, thermal stability, and thermal cycling stability.

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solar energy / phase change materials / thermal conductivity / thermal performance / stability

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Zhong Jinbao, Fan Haoxi, Wang Yongpeng, Zhang Jian, Meng Xiangyi, Feng Xianglong. PREPARATION AND PROPERTIES OF MODIFIED SEPIOLITE BASED COMPOSITE THERMAL STORAGE MATERIALS[J]. Acta Energiae Solaris Sinica. 2025, 46(11): 129-135 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1303

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