History of the Search for a Theory of Melting

Dash, J. G.

doi:10.1007/978-3-642-60030-2_2

Cited by 4 publications

(1 citation statement)

References 14 publications

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“…The implications for crystal growth are important because the anisotropy of surface melting is intimately wed to the anisotropy in the growth kinetics. The issue is also basic to the role of dimensionality-between two and three dimensions-in the nature of the melting transition (Dash 1999).…”

Section: The Surface Of Icementioning

confidence: 99%

Ice surfaces: macroscopic effects of microscopic structure

Wettlaufer

1999

Philosophical Transactions of the Royal Society of London. Seri

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The balance between ice and water controls the habitability of an important fraction of the globe and influences the majority of the world's population. The freezing of water to form ice is one of the most common phase transformations in the natural environment. However, a complete understanding of its microscopics and their influence on macroscopic phenomena still eludes us. As this millennium comes to a close, we are beginning to understand how the microscopic interfacial structure of ice controls pattern formation during ice-crystal growth, the evolution of the polycrystalline fabrics of the great ice sheets, the dynamics of ground freezing, ozone destruction, and the mechanism of charge transfer that drives thunderstorm electrification. This paper describes our evolving understanding, its implications for the basic principles of melting and freezing, and their environmental consequences.

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Section: The Surface Of Icementioning

confidence: 99%

Ice surfaces: macroscopic effects of microscopic structure

Wettlaufer

1999

Philosophical Transactions of the Royal Society of London. Seri

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Fast thermal desorption spectroscopy study of morphology and vaporization kinetics of polycrystalline ice films

McCartney

Chonde

et al. 2006

The Journal of Chemical Physics

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Fast thermal desorption spectroscopy was used to investigate the vaporization kinetics of thin (50-100 nm) H(2)O(18) and HDO tracer layers from 2-5 microm thick polycrystalline H(2)O(16) ice films at temperatures ranging from -15 to -2 degrees C. The isothermal desorption spectra of tracer species demonstrate two distinct peaks, alpha and beta, which we attribute to the vaporization of H(2)O(18) initially trapped at or near the grain boundaries and in the crystallites of the polycrystalline ice, respectively. We show that the diffusive transport of the H(2)O(18) and HDO tracer molecules in the bulk of the H(2)O(16) film is slow as compared to the film vaporization. Thus, the two peaks in the isothermal spectra are due to unequal vaporization rates of H(2)O(18) from grain boundary grooves and from the crystallites and, therefore, can be used to determine independently the vaporization rate of the single crystal part of the film and rate of thermal etching of the film. Our analysis of the tracer vaporization kinetics demonstrates that the vaporization coefficient of single crystal ice is significantly greater than those predicted by the classical vaporization mechanism at temperatures near ice melting point. We discuss surface morphological dynamics and the bulk transport phenomena in single crystal and polycrystalline ice near 0 degrees C.

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Fast thermal desorption spectroscopy study of H∕D isotopic exchange reaction in polycrystalline ice near its melting point

McCartney

Sadtchenko

2007

The Journal of Chemical Physics

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Using fast thermal desorption spectroscopy, a novel technique developed in our laboratory, we investigated the kinetics of HD isotopic exchange in 3 microm thick polycrystalline H2O ice films containing D2O layers at thicknesses ranging from 10 to 300 nm at a temperature of -2.0+/-1.5 degrees C. According to our results over the duration of a typical fast thermal desorption experiment (3-4 ms), the isotopic exchange is confined to a 50+/-10 nm wide reaction zone located at the boundary between polycrystalline H2O and D2O ice. Combining these data with a theoretical analysis of the diffusion in polycrystalline medium, we establish the range of possible values for water self-diffusion coefficients and the grain boundary widths characteristic of our ice samples. Our analysis shows that for the grain boundary width on the order of a few nanometers, the diffusivity of D2O along the grain boundaries must be at least two orders of magnitude lower than that in bulk water at the same temperature. Based on these results, we argue that, in the limit of low concentrations of impurities, polycrystalline ice does not undergo grain boundary premelting at temperatures up to -2 degrees C.

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History of the Search for a Theory of Melting

Cited by 4 publications

References 14 publications

Ice surfaces: macroscopic effects of microscopic structure

Ice surfaces: macroscopic effects of microscopic structure

Fast thermal desorption spectroscopy study of morphology and vaporization kinetics of polycrystalline ice films

Fast thermal desorption spectroscopy study of H∕D isotopic exchange reaction in polycrystalline ice near its melting point

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