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Ice nucleation rates near similar to 225 K

机译:与225 k相似的冰成核速率

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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.
机译:我们已经测量了从6.6nm至10nm至10nm和液滴温度,td的半径的过冷纳米液滴中的冰核纳米液滴中的冰核·纳米液滴,从225 k到204k。10 nm水滴的初始温度与250 k,即远高于微米尺寸水滴的均匀成核温度,类似于235 k。核切割率从类似于10(21 )cm(-3)(-3)(-1)到相似在该温度范围内为10(22)厘米(-3)(-3),与Manka等人的成核率重叠。 [物理。化学。化学。物理。 14,4505(2012)]并表明较大液滴的实验将平滑地推断Hagen等人的速率。 [J. atmos。 SCI。 38,1236(1981)]。然而,随着温度下降的速度数据中的尖角也难以与可用理论匹配,即使我们纠正典型的成核理论和用于纳米电池的高内部压力的水的物理性质。通过AIP发布发布。

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