Dispersion forces stabilise ice coatings at certain gas hydrate interfaces which prevent water wetting

• Main Authors: Boström, Mathias, Corkery, Robert, Lima, Eduardo, Malyi, Oleksandr, Buhmann, Stefan Y., Persson, Clas, Brevik, Iver, Parsons, Drew F., Fiedler, Johannes
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: arXiv 2019
• Subjects: Earth and Planetary Astrophysics astro-ph.EP; Chemical Physics physics.chem-ph; FOS Physical sciences; Ice; permafrost
• Online Access: https://dx.doi.org/10.48550/arxiv.1904.06557; https://arxiv.org/abs/1904.06557

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. CO$_2$-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.