Homogeneous Nucleation of Ice in Transiently-Heated, Supercooled Liquid Water Films.
J Phys Chem Lett
; 8(23): 5736-5743, 2017 Dec 07.
Article
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| ID: mdl-29125304
ABSTRACT
We have investigated the nucleation and growth of crystalline ice in 0.24 µm thick, supercooled water films adsorbed on Pt(111). The films were transiently heated with â¼10 ns infrared laser pulses, which produced typical heating and cooling rates of â¼109-1010 K/s. The crystallization of these water films was monitored with infrared spectroscopy. The experimental conditions were chosen to suppress ice nucleation at both the water/metal and water/vacuum interfaces. Furthermore, internal pressure increases due to curvature effects are precluded in these flat films. Therefore, the experiments were sensitive to the homogeneous ice nucleation rate from â¼210 to 225 K. The experiments show that Jmax, the maximum for the homogeneous ice nucleation rate, J(T), needs to be ≥1026 m-3 s-1 and is likely to be â¼1029±2 m-3 s-1. We argue that such large nucleation rates are consistent with experiments on hyperquenched glassy water, which typically have crystalline fractions of â¼1% or more.
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2017
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Article