Abstract

GUEVARA-RODRı́GUEZ, F. de J.. Time dependent self-diffusion coefficient of methane molecules confined into micropores structure of a sandstone. Rev. mex. fis. [online]. 2019, vol.65, n.2, pp.190-196.  Epub Apr 17, 2020. ISSN 0035-001X.  https://doi.org/10.31349/revmexfis.65.190.

In this work, the effect of pore structure of a sandstone on the molecular displacement of confined methane gas is analyzed. It was found that the self-diffusion coefficient of a methane molecule depends on the pore size distribution. In particular, the time dependent self-diffusion coefficient exhibits a maximum which is correlated with the effect of the molecular confinement. It was found that a sandstone with small pores (whose diameter is less than 20Å) traps the gas more efficiently than other sandstones.

Keywords : Porous materials; time dependent self-diffusion; confinement effect; 47.56.+r.

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