Abstract Kaolinite (Kaol) is a natural industrial mineral that has the advantages of a low cost, flame retardance, and a porous layered structure. In this study, a form-stable phase change material (FSPCM) for thermal energy storage was prepared by adsorbing stearic acid (SA) into the pores of the washed and ultrasonically treated Kaol-cetyl trimethylammonium chloride intercalation compound (Kaol-nanotubes). Analysis techniques, including X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetry (TG), and scanning electron microscopy (SEM), were used to study the structures, compositions, and thermal properties of the prepared composites. The maximum mass ratio of the SA adsorbed into the Kaol-nanotubes without leakage was as high as 35.6%, and this was ascribed to the extensive exfoliation and curling of the particles. SA was impregnated maximally into the Kaol and the Kaol-dimethyl sulfoxide intercalation compound (Kaol-DMSO) at 25.2% and 32.3%, respectively. The SA/Kaol, SA/Kaol-DMSO, and SA/Kaol-nanotube composites had phase change temperatures of 53.0 °C, 51.9 °C, and 52.4 °C and latent heats of 33.8, 43.4, and 47.5 J/g, respectively. Furthermore, these composites exhibited distinct enhanced thermal stabilities. Due to the high adsorption capacity, high latent heat, good thermal stabilities, and low cost, the SA/Kaol nanotube composite is a potential FSPCM for practical applications.

中文翻译：

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高岭石纳米管-硬脂酸复合材料作为热能储存的形状稳定相变材料

摘要 高岭石（Kaol）是一种天然的工业矿物，具有成本低、阻燃、多孔层状结构等优点。在这项研究中，通过将硬脂酸（SA）吸附到经过清洗和超声处理的 Kaol-十六烷基三甲基氯化铵插层化合物（Kaol-纳米管）的孔中，制备了一种用于热能存储的形状稳定相变材料（FSPCM）。分析技术，包括 X 射线衍射 (XRD)、傅里叶变换红外光谱 (FTIR)、差示扫描量热法 (DSC)、热重法 (TG) 和扫描电子显微镜 (SEM)，用于研究结构、组成、和制备的复合材料的热性能。无泄漏吸附到 Kaol-纳米管中的 SA 的最大质量比高达 35.6%，这归因于颗粒的大量剥落和卷曲。SA 分别以 25.2% 和 32.3% 最大程度地浸渍到 Kaol 和 Kaol-二甲基亚砜插层化合物 (Kaol-DMSO) 中。SA/Kaol、SA/Kaol-DMSO 和 SA/Kaol-纳米管复合材料的相变温度分别为 53.0 °C、51.9 °C 和 52.4 °C，潜热分别为 33.8、43.4 和 47.5 J/g . 此外，这些复合材料表现出明显增强的热稳定性。由于高吸附容量、高潜热、良好的热稳定性和低成本，SA/Kaol 纳米管复合材料是具有实际应用潜力的 FSPCM。SA/Kaol、SA/Kaol-DMSO 和 SA/Kaol-纳米管复合材料的相变温度分别为 53.0 °C、51.9 °C 和 52.4 °C，潜热分别为 33.8、43.4 和 47.5 J/g . 此外，这些复合材料表现出明显增强的热稳定性。由于高吸附容量、高潜热、良好的热稳定性和低成本，SA/Kaol 纳米管复合材料是具有实际应用潜力的 FSPCM。SA/Kaol、SA/Kaol-DMSO 和 SA/Kaol-纳米管复合材料的相变温度分别为 53.0 °C、51.9 °C 和 52.4 °C，潜热分别为 33.8、43.4 和 47.5 J/g . 此外，这些复合材料表现出明显增强的热稳定性。由于高吸附容量、高潜热、良好的热稳定性和低成本，SA/Kaol 纳米管复合材料是具有实际应用潜力的 FSPCM。