A simple free energy for the isotropic-nematic phase transition of rods
ArticleTuinier, R. (2016). A simple free energy for the isotropic-nematic phase transition of rods. Advances in Condensed Matter Physics, 2016:5871826 In Scopus Cited 0 times.
A free energy expression is proposed that describes the isotropic-nematic binodal concentrations of hard rods. A simple analytical form for this free energy was yet only available using a Gaussian trial function for the orientation distribution function (ODF), leading, however, to a significant deviation of the predicted binodals.Thenewfree energy proposed here is based upon a rationalized correction to the orientational and packing entropies when using the Gaussian ODF. In combination with Parsons-Lee theory or scaled particle theory, it enables describing the isotropic-nematic phase coexistence concentrations of rods accurately using the simple Gaussian ODF for a wide range of aspect ratios.