过冷水的时间尺度和可逆多晶作用的意义
Time scales of supercooled water and implications for reversible polyamorphism
摘要：
深度过冷水表现出复杂的动力学与大的密度波动，冰粗化和特征时间尺度从皮秒到毫秒。在这里，我们讨论这些时间尺度的影响，因为它们涉及到两相共存和过冷水的分子模拟。具体来说，我们认为，这是可能的折扣液-液临界性，因为时间尺度意味着这种行为的相关长度将不超过几个纳米的范围。类似地，可以不考虑两种液体共存，因为时间尺度意味着有界的界面自由能不能与宏观表面积成比例地增长。因此，仅从时间尺度来看，我们看到过冷水中不同密度的共存域可能只不过是纳米尺度的瞬态波动。
英文摘要：
Deeply supercooled water exhibits complex dynamics with large density fluctuations, ice coarsening and characteristic time scales extending from picoseconds to milliseconds. Here, we discuss implications of these time scales as they pertain to two-phase coexistence and to molecular simulations of supercooled water. Specifically, we argue that it is possible to discount liquid-liquid criticality because the time scales imply that correlation lengths for such behavior would be bounded by no more than a few nanometers. Similarly, it is possible to discount two-liquid coexistence because the time scales imply a bounded interfacial free energy that cannot grow in proportion to a macroscopic surface area. From time scales alone, therefore, we see that coexisting domains of differing density in supercooled water can be no more than nano-scale transient fluctuations.
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