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Generalization of the van der Waals equation for anisotropic fluids in porous media | | Myroslav Holovko
; Volodymyr Shmotolokha
; | | Date: |
1 Sep 2015 | | Abstract: | The generalized van der Waals equation of state for anisotropic liquids in
porous media consists of two terms.One of them is based on the equation of
state for hard spherocylinders in random porous media obtained from the scaled
particle theory.The second term is expressed in terms of the mean value of
attractive intermolecular interactions.The obtained equation is used for the
investigation of the gas-liquid-nematic phase behavior of a molecular system
depending on the anisotropy of molecule shapes, anisotropy of attractive
intermolecular interactions, and porosity of a porous medium.It is shown that
the anisotropic phase is formed by the anisotropy of attractive intermolecular
interactions and by the anisotropy of molecular shapes.The anisotropy of
molecular shapes shifts the phase diagram to lower densities and higher
temperatures.The anisotropy of attractive interactions widens significantly the
coexistence region between the isotropic and anisotropic phases and shifts it
to the region of lower densities and higher temperatures.It is shown that, for
sufficiently long spherocylinders, the liquid-gas transition is localized
completely within the nematic region.For all the considered cases, the decrease
of the porosity shifts the phase diagram to the region of lower densities and
lower temperatures. | | Source: | arXiv, 1509.0242 | | Services: | Forum | Review | PDF | Favorites | |
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