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Factors governing the behaviour of aqueous methane in narrow pores

Phan, A; Cole, DR; Striolo, A; (2016) Factors governing the behaviour of aqueous methane in narrow pores. Philosophical Transactions of the Royal Society A: Mathematical Physical and Engineering Sciences , 374 (2060) , Article 20150019. 10.1098/rsta.2015.0019. Green open access

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Abstract

All-atom equilibrium molecular dynamics simulations were employed to investigate the behaviour of aqueous methane confined in 1-nm-wide pores obtained from different materials. Models for silica, alumina and magnesium oxide were used to construct the slit-shaped pores. The results show that methane solubility in confined water strongly depends on the confining material, with silica yielding the highest solubility in the systems considered here. The molecular structure of confined water differs within the three pores, and density fluctuations reveal that the silica pore is effectively less 'hydrophilic' than the other two pores considered. Comparing the water fluctuation autocorrelation function with local diffusion coefficients of methane across the hydrated pores we observed a direct proportional coupling between methane and water dynamics. These simulation results help to understand the behaviour of gas in water confined within narrow subsurface formations, with possible implications for fluid transport.

Type: Article
Title: Factors governing the behaviour of aqueous methane in narrow pores
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1098/rsta.2015.0019
Publisher version: http://dx.doi.org/10.1098/rsta.2015.0019
Language: English
Additional information: Copyright © 2016 The Author(s). Published by the Royal Society. All rights reserved.
Keywords: Aqueous systems, confined fluids, molecular simulation
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1478409
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