Ice Nucleation at the Water-Sapphire Interface: Transient Sum-Frequency Response without Evidence for Transient Ice Phase.
Ice Nucleation at the Water-Sapphire Interface: Transient Sum-Frequency Response without Evidence for Transient Ice Phase.
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DOI：
10.1021/acs.jpcc.8b07480
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发表时间：
2018-11-01
期刊：
影响因子：
--
通讯作者：
Bonn M
中科院分区：
文献类型：
--
作者：
Abdelmonem A;Backus EHG;Bonn M
利用和频产生光谱技术研究了水-蓝宝石界面处的非均匀冰成核过程。我们遵循响应的O-H拉伸模式的界面水在冰成核作为时间和温度的函数。冰态和液态各自表现出非常不同的、基本上与温度无关的响应。然而，在冻结的瞬间，观察到具有显著不同强度的瞬态响应，其寿命在几秒到几分钟之间。这种瞬态信号的存在以前被归因于冰的瞬态阶段。在这里，我们证明，瞬态信号可以解释，而不调用瞬态冰相，瞬态信号可以简单地占时间依赖性的液体和冰的响应的线性组合。
Heterogeneous ice nucleation at the water–sapphire interface is studied using sum-frequency generation spectroscopy. We follow the response of the O–H stretch mode of interfacial water during ice nucleation as a function of time and temperature. The ice and liquid states each exhibit very distinct, largely temperature-independent responses. However, at the moment of freezing, a transient response with a significantly different intensity is observed, with a lifetime between several seconds and several minutes. The presence of this transient signal has previously been attributed to a transient phase of ice. Here, we demonstrate that the transient signal can be explained without invoking a transient ice phase, as the transient signal can simply be accounted for by a linear combination of time-dependent liquid and ice responses.
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