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Analysis and Optimization of Thermophysical Properties and Phase Change Behavior of Expanded Vermiculite-Based Organic Composite Phase Change Materials
Energy & Fuels ( IF 5.2 ) Pub Date : 2021-01-25 , DOI: 10.1021/acs.energyfuels.0c03647 Shuang Song 1 , Zhiwei Yang 1 , Jinhong Li 1 , Chengdong Wang 1 , Siyi Zhao 1
Energy & Fuels ( IF 5.2 ) Pub Date : 2021-01-25 , DOI: 10.1021/acs.energyfuels.0c03647 Shuang Song 1 , Zhiwei Yang 1 , Jinhong Li 1 , Chengdong Wang 1 , Siyi Zhao 1
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In this study, the optimized expanded vermiculite (EVM) was used as the matrix and a series of novel form-stable composite phase change materials (fs-CPCMs) were prepared by the physical impregnation method. The results showed that acid leaching and organic intercalation EVM had a better package effect (≥74.9 wt %) and heat storage capacity (≥139.2 J/g) compared with EVM, which showed a good optimization effect, revealing that proper modification treatment was beneficial to the improvement of the thermophysical properties of composite PCMs. Nonisothermal crystallization kinetics demonstrated that the EVM matrix was beneficial to reduce the nucleation activation energy (ΔEa) of PEG, and the optimized EVM could further reduce the ΔEa, which effectively improved the crystal nucleation process of PEG. However, the matrix would restrict the crystal growth process of PEG, which had certain adverse effects. Moreover, XRD, TGA, and cycle tests showed that the prepared novel fs-CPCMs had excellent chemical stability, thermal stability, and cycle reliability. This research provided a certain theoretical reference and technical support for the preparation of mineral-based organic composite phase change materials with high heat storage capacity and excellent phase change behavior.
中文翻译：
膨胀Ver石基有机复合相变材料的热物理性质和相变行为的分析与优化
在这项研究中，以优化的膨胀ver石（EVM）为基质，并通过物理浸渍法制备了一系列新型的形状稳定的复合相变材料（fs-CPCMs）。结果表明，与EVM相比，酸浸和有机插层EVM具有更好的包装效果（≥74.9wt％）和储热容量（≥139.2J / g），具有良好的优化效果，表明适当的改性处理是有益的。改善复合PCM的热物理性能。非等温结晶动力学表明，EVM矩阵是利于减少成核的活化能（Δ Ë一个PEG），以及优化的EVM可以进一步降低Δ Ë一个，有效地改善了PEG的晶体成核过程。然而，基质将限制PEG的晶体生长过程，这具有某些不利影响。此外，XRD，TGA和循环测试表明，所制备的新型fs-CPCM具有优异的化学稳定性，热稳定性和循环可靠性。该研究为储热能力高，相变行为优异的矿物基有机复合相变材料的制备提供了一定的理论参考和技术支持。
更新日期：2021-02-04
中文翻译：
膨胀Ver石基有机复合相变材料的热物理性质和相变行为的分析与优化
在这项研究中，以优化的膨胀ver石（EVM）为基质，并通过物理浸渍法制备了一系列新型的形状稳定的复合相变材料（fs-CPCMs）。结果表明，与EVM相比，酸浸和有机插层EVM具有更好的包装效果（≥74.9wt％）和储热容量（≥139.2J / g），具有良好的优化效果，表明适当的改性处理是有益的。改善复合PCM的热物理性能。非等温结晶动力学表明，EVM矩阵是利于减少成核的活化能（Δ Ë一个PEG），以及优化的EVM可以进一步降低Δ Ë一个，有效地改善了PEG的晶体成核过程。然而，基质将限制PEG的晶体生长过程，这具有某些不利影响。此外，XRD，TGA和循环测试表明，所制备的新型fs-CPCM具有优异的化学稳定性，热稳定性和循环可靠性。该研究为储热能力高，相变行为优异的矿物基有机复合相变材料的制备提供了一定的理论参考和技术支持。
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