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Applying the Z method to estimate temperatures of melting in structure II clathrate hydrates
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Finney, Aaron R. and Rodger, P. Mark (2011) Applying the Z method to estimate temperatures of melting in structure II clathrate hydrates. Physical Chemistry Chemical Physics, Vol.13 (No.44). pp. 19979-19987. doi:10.1039/c1cp21919g
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Official URL: http://dx.doi.org/10.1039/c1cp21919g
Abstract
Equilibrium melting temperatures for structure II THF hydrate and argon/xenon (Ar/Xe) binary hydrate have been calculated using molecular dynamics using two melting techniques, namely the Z method [Belonoshko et al., Phys. Rev. B, 2006, 73, 012201] (applied for the first time to complex molecular solids) and direct phase coexistence simulations. The two methods give results in moderate agreement: calculations with the Z method give T(fus) to be 250.7 K (0.77 katm) for THF and 244.3 K (1.86 katm) for Ar/Xe hydrate respectively; the corresponding direct phase coexistence calculations give T(fus) in the range 235-240 K (0.77 katm) for THF and 240-252.5 K (1.86 katm) for Ar/Xe hydrate. The Z method was found to define the key thermodynamic states with high precision, although required long simulation times with these multicomponent molecular systems to ensure the complete melting required by the method. In contrast, the direct phase coexistence method did bracket the equilibrium temperature with little difficulty, but small thermodynamic driving forces close to phase equilibrium generated long-lived fluctuations, that obscured the precise value of phase coexistence conditions within the bracketed range.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QD Chemistry | ||||
| Divisions: | Faculty of Science > Chemistry | ||||
| Library of Congress Subject Headings (LCSH): | Clathrate compounds, Hydrates, Molecular dynamics, Crystal growth, Nucleation | ||||
| Journal or Publication Title: | Physical Chemistry Chemical Physics | ||||
| Publisher: | Royal Society of Chemistry | ||||
| ISSN: | 1463-9076 | ||||
| Official Date: | 13 October 2011 | ||||
| Dates: |
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| Volume: | Vol.13 | ||||
| Number: | No.44 | ||||
| Page Range: | pp. 19979-19987 | ||||
| DOI: | 10.1039/c1cp21919g | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC) | ||||
| Grant number: | EP-I001514 (EPSRC) |
Data sourced from Thomson Reuters' Web of Knowledge
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