Why Is It So Difficult to Identify the Onset of Ice Premelting?,The Journal of Physical Chemistry Letters

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Why Is It So Difficult to Identify the Onset of Ice Premelting?
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2018-08-27 00:00:00 , DOI: 10.1021/acs.jpclett.8b02244
Yuqing Qiu ₁ , Valeria Molinero ₁

Affiliation

Premelting of ice at temperatures below 0 °C is of fundamental importance for environmental processes. Various experimental techniques have been used to investigate the temperature at which liquid-like water first appears at the ice–vapor interface, reporting onset temperatures from −160 to −2 °C. The signals that identify liquid-like order at the ice–vapor interface in these studies, however, do not show a sharp initiation with temperature. That is at odds with the expected first-order nature of surface phase transitions, and consistent with recent large-scale molecular simulations that show the first premelted layer to be sparse and to develop continuously over a wide range of temperatures. Here we perform a thermodynamic analysis to elucidate the origin of the continuous formation of the first layer of liquid at the ice–vapor interface. We conclude that a negative value of the line tension of the ice–liquid–vapor three-phase contact line is responsible for the continuous character of the transition and the sparse nature of the liquid-like domains in the incomplete first layer.

中文翻译：

为什么很难识别冰的预融化开始时间？

在低于0°C的温度下进行冰的预融对于环境过程至关重要。已经使用了各种实验技术来研究液体状水首次出现在冰-蒸汽界面的温度，报告的起始温度为-160至-2°C。然而，在这些研究中，在冰汽界面处识别出类似液体秩序的信号并没有随温度急剧上升。这与预期的表面相变的一阶性质是矛盾的，并且与最近的大规模分子模拟相一致，该模拟显示出第一预熔融层稀疏并在很宽的温度范围内连续发展。在这里，我们进行热力学分析，以阐明在冰汽界面处连续形成第一层液体的起源。

更新日期：2018-08-27

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