Kinetics of the homogeneous freezing of water
Kinetics of the homogeneous freezing of water
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DOI：
10.1039/c003297b
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发表时间：
2010-01-01
影响因子：
3.3
通讯作者：
Murray, E. J.
中科院分区：
文献类型：
--
作者：
Murray, B. J.;Broadley, S. L.;Murray, E. J.
本文报道了微米级水滴中冰的均质成核速率。使用一种新的系统进行测量，在该系统中，液滴被支持在疏水基底上，并且当它们以受控速率冷却时，使用光学显微镜监测它们的相。我们的成核率是一致的，给出了引用的不确定性，与最近的文献数据。然而，考虑到均质成核对地球大气中云的形成的重要性，均质冻结速率的不确定程度仍然是不可接受的。我们继续使用最新的立方冰（亚稳相认为从过冷水成核）的热力学数据来估计立方冰-过冷水界面的界面能。我们估计在234.9-236.7 K温度范围内的值为20.8 +/- 1.2 mJ m（-2）。
Rates of homogeneous nucleation of ice in micrometre-sized water droplets are reported. Measurements were made using a new system in which droplets were supported on a hydrophobic substrate and their phase was monitored using optical microscopy as they were cooled at a controlled rate. Our nucleation rates are in agreement, given the quoted uncertainties, with the most recent literature data. However, the level of uncertainty in the rate of homogeneous freezing remains unacceptable given the importance of homogeneous nucleation to cloud formation in the Earth's atmosphere. We go on to use the most recent thermodynamic data for cubic ice (the metastable phase thought to nucleate from supercooled water) to estimate the interfacial energy of the cubic ice-supercooled water interface. We estimate a value of 20.8 +/- 1.2 mJ m(-2) in the temperature range 234.9-236.7 K.