亚稳态离子液体[$C_{2}mim$][$CH_{3}SO_{3}$]的热导率
Thermal Conductivity of Metastable Ionic Liquid [$C_{2}mim$][$CH_{3}SO_{3}$]
AI总结：
本文测量[$C_{2}mim$][$CH_{3}SO_{3}$]在278–355 K的热导率并修正熔点，证实其熔点以下存在液体亚稳态，而现有Bridgman类模型预测精度不足。
摘要：
离子液体已被建议作为新型工程流体，即在传热领域中，作为当前联苯与二苯醚、烷基化芳烃以及二甲基聚硅氧烷油的替代品；这些物质在200 °C以上会降解，并带来一些环境问题。最近，我们提出将1-乙基-3-甲基咪唑甲磺酸盐[$C_{2}mim$][$CH_{3}SO_{3}$]作为一种新型传热流体，原因在于其热物理性质和毒理学性质。然而，这项工作也提出了一些有趣的问题，即在熔点（303 K）以下是否可能存在液体亚稳态，或在达到量热凝固点之前是否存在二阶有序-无序转变（λ型）。本文通过报告278至355 K之间、在95%置信水平下估计不确定度为2%的精确热导率测量结果，更详细地分析了纯流体相图的这一区域。文中还报告了新的熔点值，$T_{melt}$ = 307.8 ± 1 K。所得结果支持固相区域内的液体亚稳态行为，并使这种离子液体能够在低于其熔点的温度下用作传热流体。本工作还使用了基于Bridgman理论和估算公式的热导率模型，但这些模型未能在实验数据的不确定度范围内对其作出预测。
英文摘要：
Ionic liquids have been suggested as new engineering fluids, namely in the area of heat transfer, as alternatives to current biphenyl and diphenyl oxide, alkylated aromatics and dimethyl polysiloxane oils, which degrade above 200 °C and pose some environmental problems. Recently, we have proposed 1-ethyl-3-methylimidazolium methanesulfonate, [$C_{2}mim$][$CH_{3}SO_{3}$], as a new heat transfer fluid, because of its thermophysical and toxicological properties. However, there are some interesting points raised in this work, namely the possibility of the existence of liquid metastability below the melting point (303 K) or second order-disorder transitions ($λ$-type) before reaching the calorimetric freezing point. This paper analyses in more detail this zone of the phase diagram of the pure fluid, by reporting accurate thermal-conductivity measurements between 278 and 355 K with an estimated uncertainty of 2% at a 95% confidence level. A new value of the melting temperature is also reported, $T_{melt}$ = 307.8 $\pm$ 1 K. Results obtained support liquid metastability behaviour in the solid-phase region and permit the use of this ionic liquid at a heat transfer fluid at temperatures below its melting point. Thermal conductivity models based on Bridgman theory and estimation formulas were also used in this work, failing to predict the experimental data within its uncertainty.
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