Here, we report the results of qualitative and quantitative investigations of the first-order phase transition in the ionic liquid 1-ethylpyridinium triflate exhibiting a high variability of temperature ranges, within which the freezing and melting occur. By two methods, the direct fast quenching/annealing and the slow temperature-controlled differential scanning calorimeter, it is revealed that despite the almost constant absolute enthalpies of phase transition, the freezing occurs faster with the larger temperature contrast (cooling rate) between the initially hotter sample and the colder surrounding. This feature is a clear exhibition of the Mpemba effect. The regularity in the change of the melting point is analyzed as well.

在这里，我们报告了离子液体 1-乙基吡啶三氟甲磺酸盐中一级相变的定性和定量研究结果，该结果显示出温度范围的高度可变性，在该温度范围内会发生冷冻和熔化。通过直接快速淬火/退火和慢速温控差示扫描量热仪两种方法，揭示了尽管相变的绝对焓几乎恒定，但随着初始之间的较大温度差异（冷却速率），冻结发生得更快样品越热，周围越冷。这一特征是姆潘巴效应的明显体现。还分析了熔点变化的规律。