Water at the cavitation limit: Density of the metastable liquid and size of the critical bubble
Water at the cavitation limit: Density of the metastable liquid and size of the critical bubble
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DOI：
10.1209/0295-5075/90/16002
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发表时间：
2010-04-01
期刊：
影响因子：
1.8
通讯作者：
Caupin, Frederic
中科院分区：
文献类型：
--
作者：
Davitt, Kristina;Arvengas, Arnaud;Caupin, Frederic
液体承受机械张力的能力是物质内聚力的壮观表现。水就是一个典型的例子，因为它的氢键具有很高的凝聚力。对其空化破裂极限的了解可以提供有关其结构的有价值的信息。到目前为止，基于不同的液体亚稳度物理测量的实验结果的多样性已经模糊了这个极限。我们建立了一个光纤探针水听器，以提供声空化极限下液体密度的缺失数据。我们在0到50摄氏度之间的测量可以与另一种成功的方法进行明确的比较，其中张力是在石英中微米大小的水包裹体中产生的。我们还将以前的极限压力的声学测量扩展到190℃，并考虑对经典成核理论的简单修改来描述我们的数据。应用成核定理给出了临界气泡尺寸的第一个实验值，该值位于纳米范围内。结果表明，在包裹体实验中存在一种稳定杂质，或者是一种普遍存在的对水的物理性质至关重要的杂质。中国人民解放军版权所有，2010年
The ability of a liquid to sustain mechanical tension is a spectacular manifestation of the cohesion of matter. Water is a paradigmatic example, because of its high cohesion due to hydrogen bonds. The knowledge of its limit of rupture by cavitation can bring valuable information about its structure. Up to now, this limit has been obscured by the diversity of experimental results based on different physical measures of the degree of metastability of the liquid. We have built a fiber optic probe hydrophone to provide the missing data on the density of the liquid at the acoustic cavitation limit. Our measurements between 0 and 50 degrees C allow a clear-cut comparison with another successful method where tension is produced in micron-sized inclusions of water in quartz. We also extend previous acoustic measurements of the limiting pressure to 190 degrees C, and we consider a simple modification of classical nucleation theory to describe our data. Applying the nucleation theorem gives the first experimental value for the size of the critical bubble, which lies in the nanometer range. The results suggest the existence of either a stabilizing impurity in the inclusion experiments, or an ubiquitous impurity essential to the physics of water. Copyright (C) EPLA, 2010