Icy Worlds

Dispersion Forces Stabilise Ice Coatings at Certain Gas Hydrate Interfaces Which Prevent Water Wetting

By Keith Cowing
Press Release
April 15, 2019
Filed under
Dispersion Forces Stabilise Ice Coatings at Certain Gas Hydrate Interfaces Which Prevent Water Wetting
Schematic figure of the considered arrangement. A gas hydrate surface (ε3) on the left, separated by an ice layer (ε2) of thickness d from a water layer (ε1). A dry surface feels a repulsive Casimir force at the ice-water interface which yields a stable ice interface. In contrast, an attractive force results in a wet surface due to the vanishing of the ice interface.

Gas hydrates formed in oceans and permafrost occur in vast quantities on Earth representing both a massive potential fuel source and a large threat in climate forecasts. They have been predicted to be important on other bodies in our solar systems such as Enceladus, a moon of Saturn.

CO2-hydrates likely drive the massive gas-rich water plumes seen and sampled by the spacecraft Cassini, and the source of these hydrates is thought to be due to buoyant gas hydrate particles. Dispersion forces cause gas hydrates to be coated in a 3-4 nm thick film of ice, or to contact water directly, depending on which gas they contain. These films are shown to significantly alter the properties of the gas hydrate clusters, for example, whether they float or sink. It is also expected to influence gas hydrate growth and gas leakage.

Mathias Boström, Robert Corkery, Eduardo Lima, Oleksandr Malyi, Stefan Y. Buhmann, Clas Persson, Iver Brevik, Drew F. Parsons, Johannes Fiedler
(Submitted on 13 Apr 2019)

Subjects: Earth and Planetary Astrophysics (astro-ph.EP); Chemical Physics (physics.chem-ph)
DOI: 10.1021/acsearthspacechem.9b00019
Cite as: arXiv:1904.06557 [astro-ph.EP] (or arXiv:1904.06557v1 [astro-ph.EP] for this version)
Submission history
From: Johannes Fiedler
[v1] Sat, 13 Apr 2019 14:39:43 UTC (745 KB)

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