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• W2023157039 abstract "Abstract The phase transition from an isotropic to a nematic phase for a classical fluid of hard ellipsoids has been studied using a version of a theory originally due to Onsager and by computer simulation. In the proposed form of the Onsager theory for the Helmholtz free energy, both the second and the third virial coefficients are treated exactly, but the fourth and higher virials are resummed in a manner consistent with the Carnahan-Starling equation of state for hard spheres. This same approach is applied to the calculation of the direct correlation function. A comparison of order parameters, transition densities and pressures calculated by simulation and by the resummed Onsager theory, suggests the following. (i) For 10 : 1 prolate hard ellipsoids, resumming the fourth and higher virial coefficients (rather than simply neglecting them) degrades the agreement by overestimating the importance of the higher virials. (ii) For 5 : 1 prolate and 1 : 5 oblate hard ellipsoids, the resummation yields a considerable improvement over an Onsager theory based on the second and third virials alone. (iii) Although it seems straightforward to predict the liquid crystal transition densities with some accuracy by means of these theories, accurate calculations of the direct and pair correlation functions for hard spheres using our resummation ideas still poses a challenge. Only at packing fractions less than 0·25 does the present theory portray accurately the radial distribution function for hard spheres." @default.
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• W2023157039 date "1994-02-10" @default.
• W2023157039 modified "2023-10-02" @default.
• W2023157039 title "The isotropic to nematic liquid crystal transition for hard ellipsoids: An Onsager-like theory and computer simulations" @default.
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• W2023157039 doi "https://doi.org/10.1080/00268979400100181" @default.
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