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Researchers observed exceptionally fast methane diffusion between two common methane hydrate structures. This finding could impact energy technologies and understanding methane mobility in icy celestial bodies.

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Area of Science:

  • Geochemistry
  • Materials Science
  • Planetary Science

Background:

  • Methane hydrates are crucial for energy and environmental technologies.
  • They form naturally on Earth and in icy celestial bodies.
  • Understanding methane mobility within hydrates is key to various applications.

Purpose of the Study:

  • To experimentally observe methane diffusion at the interface of clathrate hydrate structures I and II.
  • To investigate the kinetics of methane mobility under high pressure.

Main Methods:

  • Quasielastic neutron scattering (QENS) was employed to measure methane diffusion.
  • Experiments were conducted at a pressure of 0.8 GPa.

Main Results:

  • An extremely fast methane translational diffusion was observed at the interface of clathrate structures I and II.
  • Methane diffusion was faster than in pure supercritical methane at comparable conditions.
  • This accelerated diffusion may be due to confinement or methane aggregation (micro-nanobubbles).

Conclusions:

  • The findings offer insights into sI-sII conversion kinetics in gas exchange experiments.
  • This research contributes to understanding methane mobility in extraterrestrial icy bodies.
  • The accelerated diffusion has implications for energy and environmental technologies involving methane hydrates.