Journal
PHYSICAL REVIEW B
Volume 80, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.134306
Keywords
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Funding
- Ireland-Canada University Foundation
- Royal Irish Academy
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Extensive equilibrium molecular-dynamics simulations have been performed to investigate thermal-conduction mechanisms via the Green-Kubo approach for fully occupied type I, II, and H methane hydrates, in addition to ice Ih and a hypothetical empty type I hydrate structure. The TIP4P water model was used in conjunction with a fully atomistic methane potential with which it had been parameterized from quantum simulation, along with long-range Ewald electrostatics. We have found that the crystal structure of the clathrate framework and guest-host interactions in type I methane hydrate contribute to a lower thermal conductivity vis-a-vis ice Ih and its glasslike temperature dependence, respectively; damping in methane-host energy transfer above 100 K was determined to be responsible for the latter. However, we have found that substantially less damping in guest-host energy transfer is present in type II and H methane-hydrate polymorphs at higher temperatures, giving rise to somewhat larger thermal conductivities relative to type I methane hydrate with a crystal-like temperature dependence.
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