Abstract In the current work, we reported the size effects of rutile TiO2 nanoparticles on the latent heat recovered of eutectic hydrate salt (EHS) phase change material (PCM). The nanoparticles modified EHS composites were prepared with different volume loadings (0.1 %, 0.3 % and 0.5 %) of TiO2 nanoparticles with two different sizes of 25 and 100 nm. The rheological behaviour analysis was carried out to demonstrate the dispersion stability of TiO2 nanoparticles in EHS. The factorial experiment method has been developed to evaluate the size effects of TiO2 nanoparticles. Meanwhile, the characterization technique, DSC was used to investigate the thermal properties. The results showed that the nanoparticles modified EHS composites incorporated with TiO2 nanoparticles in diameter of 25 nm achieved an optimal latent heat recovered, of which the mechanism analyses were validated by SEM and FT-IR. This study will provide insights into the further improvement of thermal properties of nanoparticles modified PCM composites by means of tailoring the size of nanoparticles.

中文翻译：

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纳米金红石TiO2对二元共晶水合物盐相变材料潜热回收的尺寸效应

摘要 在目前的工作中，我们报道了金红石 TiO2 纳米颗粒对共晶水合物盐 (EHS) 相变材料 (PCM) 潜热回收的尺寸影响。纳米粒子改性的 EHS 复合材料是用不同体积负载（0.1%、0.3% 和 0.5%）的具有 25 和 100 nm 两种不同尺寸的 TiO2 纳米粒子制备的。进行流变行为分析以证明 TiO2 纳米粒子在 EHS 中的分散稳定性。已经开发了析因实验方法来评估 TiO2 纳米粒子的尺寸效应。同时，表征技术，DSC用于研究热性能。结果表明，纳米粒子改性的 EHS 复合材料掺入了直径为 25 nm 的 TiO2 纳米粒子，实现了最佳潜热回收，其中机理分析得到了SEM和FT-IR的验证。这项研究将通过调整纳米颗粒的尺寸，为进一步改善纳米颗粒改性 PCM 复合材料的热性能提供见解。