Growth of the Phase Change Enthalpy Induced by the Crystal Transformation of an Inorganic–Organic Eutectic Mixture of Magnesium Nitrate Hexahydrate–Glutaric Acid,Industrial & Engineering Chemistry Research

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Growth of the Phase Change Enthalpy Induced by the Crystal Transformation of an Inorganic–Organic Eutectic Mixture of Magnesium Nitrate Hexahydrate–Glutaric Acid
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-03-26 , DOI: 10.1021/acs.iecr.0c01029
Suimin Li ₁ , Shao Lin ₁ , Ziye Ling _{1,

2} , Xiaoming Fang _{1,

2} , Zhengguo Zhang _{1,

2}

Affiliation

Developing phase change materials (PCMs) with high latent heat is significant for latent heat storage technology. Herein, an inorganic–organic eutectic mixture PCM of Mg(NO₃)₂·6H₂O (MNH) and glutaric acid (GA) exhibited a melting enthalpy of 189.0 J·g^–1, which is higher than that of each raw material. The characterizations of the structure and crystallization behavior revealed that the increase in latent heat was associated with the crystalline transformation of the MNH–GA eutectic. Additionally, the thermal stability of the MNH–GA eutectic was enhanced because the decreased melting temperature of 66.7 °C was lower than the dehydration temperature. Compared with expanded graphite (EG), expanded perlite (EP) with a larger pore size is a more suitable supporting material for the MNH–GA eutectic because the small layer gaps within EG hinder the phase transformations of the MNH–GA eutectic. The thermal reliability of MNH–GA/EP could have a high stability, and the latent heat only decreased by 2.3 J·g^–1 after 100 thermal cycles.

中文翻译：

硝酸镁六水合戊二酸的无机-有机共晶混合物的晶体转变诱导相变焓的生长

开发具有高潜热的相变材料（PCM）对于潜热存储技术具有重要意义。在此，Mg（NO ₃）₂ ·6H ₂ O（MNH）和戊二酸（GA）的无机-有机共晶混合物PCM的熔融焓为189.0 J·g ^–1，高于每种原材料的价格。结构和结晶行为的表征表明，潜热的增加与MNH-GA共晶的结晶转变有关。此外，MNH-GA共晶的热稳定性得到增强，因为降低的熔化温度66.7°C低于脱水温度。与膨胀石墨（EG）相比，孔径较大的膨胀珍珠岩（EP）是更适合MNH-GA共晶的支撑材料，因为EG内的小层隙会阻碍MNH-GA共晶的相变。MNH-GA / EP的热可靠性可能具有很高的稳定性，并且在100个热循环后潜热仅降低了2.3 J·g ^–1。

更新日期：2020-03-27

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