Composition and formation age of amorphous silica coating glacially polished surfaces
نویسندگان
چکیده
منابع مشابه
Structure and Dynamics of amorphous Silica Surfaces
We use molecular dynamics computer simulations to study the equilibrium properties of the surface of amorphous silica. Two types of geometries are investigated: i) clusters with different diameters (13.5Å, 19Å, and 26.5Å) and ii) a thin film with thickness 29Å. We find that the shape of the clusters is independent of temperature and that it becomes more spherical with increasing size. The surfa...
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The structure of surfaces and interfaces of silica (SiO2) is investigated by large scale molecular dynamics computer simulations. In the case of a free silica surface, the results of a classical molecular dynamics simulation are compared to those of an ab initio method, the Car–Parrinello molecular dynamics. This comparative study allows to check the accuracy of the model potential that underli...
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Formation of Molecular Hydrogen on Amorphous Silicate Surfaces
Experimental results on the formation of molecular hydrogen on amorphous silicate surfaces are presented and analyzed using a rate equation model. The energy barriers for the relevant diffusion and desorption processes are obtained. They turn out to be significantly higher than those obtained for polycrystalline silicates, demonstrating the importance of grain morphology. Using these barriers w...
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ژورنال
عنوان ژورنال: Geology
سال: 2019
ISSN: 0091-7613
DOI: 10.1130/g45737.1