Ice nucleation rates near ∼225 K
Ice nucleation rates near ∼225 K
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DOI：
10.1063/1.5019362
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发表时间：
2018-02-28
影响因子：
4.4
通讯作者：
Wyslouzil, Barbara E.
中科院分区：
文献类型：
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作者：
Amaya, Andrew J.;Wyslouzil, Barbara E.
我们测量了半径为6.6 nm ~ 10 nm、温度为225 K ~ 204 K的过冷纳米液滴的冰成核速率J（ice）。10 nm水滴的初始温度类似于250 K，即，远高于微米级水滴的均匀成核温度，T-H类似于235 K。在该温度范围内，成核速率从近似10（21）cm（-3）s（-1）系统地增加到近似10（22）cm（-3）s（-1），与Manka等人[Phys.Chem.Chem.Phys.14，4505（2012）]的成核速率重叠，并建议用较大液滴的实验将平滑地外推哈根等人的速率[J. Atmos. Sci. 38，1236（1981）]。然而，当温度下降时，速率数据中的尖角难以与现有理论相匹配，即使我们校正经典成核理论和水的物理性质以用于纳米液滴的高内部压力。出版社：AIP Publishing
We have measured the ice nucleation rates, J(ice), in supercooled nano-droplets with radii ranging from 6.6 nm to 10 nm and droplet temperatures, T-d, ranging from 225 K to 204 K. The initial temperature of the 10 nm water droplets is similar to 250 K, i.e., well above the homogeneous nucleation temperature for micron sized water droplets, T-H similar to 235 K. The nucleation rates increase systematically from similar to 10(21) cm(-3) s(-1) to similar to 10(22) cm(-3) s(-1) in this temperature range, overlap with the nucleation rates of Manka et al. [Phys. Chem. Chem. Phys. 14, 4505 (2012)], and suggest that experiments with larger droplets would extrapolate smoothly the rates of Hagen et al. [J. Atmos. Sci. 38, 1236 (1981)]. The sharp corner in the rate data as temperature drops is, however, difficult to match with available theory even if we correct classical nucleation theory and the physical properties of water for the high internal pressure of the nanodroplets. Published by AIP Publishing.