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- W3152186558 abstract "Abstract Methane, the principal component of natural gas, is an important energy source and raw material for chemical reactions. It also plays a significant role in planetary physics, being one of the major constituents of giant planets. Here, we report measurements of the molecular self-diffusion coefficient of dense supercritical CH 4 reaching the freezing pressure. We find that the high-pressure behaviour of the self-diffusion coefficient measured by quasi-elastic neutron scattering at 300 K departs from that expected for a dense fluid of hard spheres and suggests a density-dependent molecular diameter. Breakdown of the Stokes–Einstein–Sutherland relation is observed and the experimental results suggest the existence of another scaling between self-diffusion coefficient D and shear viscosity η , in such a way that D η / ρ =constant at constant temperature, with ρ the density. These findings underpin the lack of a simple model for dense fluids including the pressure dependence of their transport properties." @default.
- W3152186558 created "2021-04-13" @default.
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- W3152186558 date "2021-03-30" @default.
- W3152186558 modified "2023-10-14" @default.
- W3152186558 title "Diffusion in dense supercritical methane from quasi-elastic neutron scattering measurements" @default.
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- W3152186558 doi "https://doi.org/10.1038/s41467-021-22182-4" @default.
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