Phase behaviour and dynamics in primitive models of molecular ionic liquids

Details Phase behaviour and dynamics in primitive models of molecular ionic liquids Phase behaviour and dynamics in primitive models of molecular ionic liquids

2012-02-20

arxiv.org/abs/1202.4279v2

Condens. Matter Phys., 2011, vol. 14, No. 3, 33602: 1-15

Physics

Condensed Matter

Soft Condensed Matter

15 pages, 7 figures

Scientific paper

10.5488/CMP.14.33602

The phase behaviour and dynamics of molecular ionic liquids are studied using primitive models and extensive computer simulations. The models account for size disparity between cation and anion, charge location on the cation, and cation-shape anisotropy, which are all prominent features of important materials such as room-temperature ionic liquids. The vapour-liquid phase diagrams are determined using high-precision Monte Carlo simulations, setting the scene for in-depth studies of ion dynamics in the liquid state. Molecular dynamics simulations are used to explore the structure, single-particle translational and rotational autocorrelation functions, cation orientational autocorrelations, self diffusion, viscosity, and frequency-dependent conductivity. The results reveal some of the molecular-scale mechanisms for charge transport, involving molecular translation, rotation, and association.

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