Hypercooling Temperature of Water is about 100 K Higher than Calculated before
Hypercooling Temperature of Water is about 100 K Higher than Calculated before
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DOI：
10.1021/acs.jpclett.7b03068
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发表时间：
2018-02-01
影响因子：
5.7
通讯作者：
Bauerecker, Sigurd
中科院分区：
文献类型：
--
作者：
Buttersack, Tillmann;Weiss, Volker C.;Bauerecker, Sigurd
对于深度过冷的液体，在过冷温度下，从两阶段冻结过程到完全凝固的转变发生在一个冻结步骤中，这个术语在水的研究中似乎几乎是未知的;据我们所知，它只被Dolan等人提到过。没有这个表达式的原因可能是文献中对水的过冷温度的最佳估计约为-160 ℃（113 K）。这个温度远低于实验上可实现的过冷度的极限，接近-40摄氏度（233 K），这标志着普通纯水的均匀成核温度T-H;事实上，它甚至低于玻璃化转变温度（133 K）。令人惊讶的是，考虑到水和冰的热容以及冻结焓的温度依赖性的更彻底的分析表明，水的过冷温度约为-64 ℃或209 K，比以前估计的高出近100 K。最令人兴奋的结果之一是，现有的实验已经能够达到这些过冷度，我们预测在这些温度下会发生冻结行为的转变。
For deeply supercooled liquids the transition from a two-stage freezing process to complete solidification in just one freezing step occurs at the hypercooling temperature, a term that seems to be almost unknown in water research; to our knowledge, it has only been mentioned by Dolan et al. for high-pressure ice. The reason for the absence of this expression may be that the best estimate to be found in the literature for the hypercooling temperature of water is about -160 degrees C (113 K). This temperature is far below the limit of experimentally realizable degrees of supercooling near -40 degrees C (233 K), which marks the homogeneous nucleation temperature T-H of common pure water; in fact, it is even below the glass-transition temperature (133 K). Here we show that, surprisingly, a more thorough analysis taking into account the temperature dependence of the heat capacities of water and ice as well as of the enthalpy of freezing shows that the hypercooling temperature of water is about -64 degrees C or 209 K, almost 100 K higher than estimated before. One of the most exciting consequences is that existing experiments are already able to reach these degrees of supercooling, and it is our prediction that a transition in the freezing behavior occurs at these temperatures.