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Issue 40, 2010
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Microscopic structure of liquid 1-1-1-2-tetrafluoroethane (R134a) from Monte Carlo simulation

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Abstract

1-1-1-2-tetrafluoroethane (R134a) is one of the most commonly used refrigerants. Its thermophysical properties are important for evaluating the performance of refrigeration cycles. These can be obtained via computer simulation, with an insight into the microscopic structure of the liquid, which is not accessible to experiment. In this paper, vapour–liquid equilibrium properties of R134a and its liquid microscopic structure are investigated using coupled–decoupled configurational-bias Monte Carlo simulation in the Gibbs ensemble, with a recent potential [J. Phys. Chem. B 2009, 113, 178]. We find that the simulations agree well with the experimental data, except at the vicinity of the critical region. Liquid R134a packs like liquid argon, with a coordination number in the first solvation shell of 12 at 260 K. The nearest neighbours prefer to be localized in three different spaces around the central molecule, in such a manner that the dipole moments are in a parallel alignment. Analysis of the pair interaction energy shows clear association of R134a molecules, but no evidence for C–H⋯F type hydrogen bonding is found. The above findings should be of relevance to a broad range of fluoroalkanes.

Graphical abstract: Microscopic structure of liquid 1-1-1-2-tetrafluoroethane (R134a) from Monte Carlo simulation

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Publication details

The article was received on 19 May 2010, accepted on 06 Aug 2010 and first published on 07 Sep 2010


Article type: Paper
DOI: 10.1039/C0CP00620C
Citation: Phys. Chem. Chem. Phys., 2010,12, 13266-13272
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    Microscopic structure of liquid 1-1-1-2-tetrafluoroethane (R134a) from Monte Carlo simulation

    H. Do, R. J. Wheatley and J. D. Hirst, Phys. Chem. Chem. Phys., 2010, 12, 13266
    DOI: 10.1039/C0CP00620C

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