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Entropic Behavior of Binary Carbonaceous Mesophases
Department of Chemical Engineering, McGill University, Montreal, Quebec H3A 2B2, Canada
* Author to whom correspondence should be addressed.
Received: 28 July 2008; in revised form: 19 August 2008 / Accepted: 19 August 2008 / Published: 23 August 2008
Abstract: The Maier-Saupe model for binary mixtures of uniaxial discotic nematogens, formulated in a previous study , is used to compute and characterize orientational entropy  and orientational specific heat. These thermodynamic quantities are used to determine mixture type (ideal or non-ideal) which arise due to their different intrinsic properties, determined by the molecular weight asymmetry ΔMw and the molecular interaction parameter β. These molecular properties are also used to characterize the critical concentration where the mixture behaves like a single component system and exhibits the minimum nematic to isotropic (NI) transition temperature (pseudo-pure mixture). A transition within the nematic phase takes place at this specific concentration. According to the Maier-Saupe model, in a single mesogen, entropy at NI transition is a universal value; in this work we quantify the mixing effect on this universal property. The results and analysis provide a new tool to characterize molecular interaction and molecular weight differences in mesogenic mixtures using standard calorimetric measurements.
Keywords: Entropy; specific heat; discotic nematic liquid crystal; molecular weight; mixture; carbonaceous mesophase.
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Golmohammadi, M.; Rey, A.D. Entropic Behavior of Binary Carbonaceous Mesophases. Entropy 2008, 10, 183-199.
Golmohammadi M, Rey AD. Entropic Behavior of Binary Carbonaceous Mesophases. Entropy. 2008; 10(3):183-199.
Golmohammadi, Mojdeh; Rey, Alejandro D. 2008. "Entropic Behavior of Binary Carbonaceous Mesophases." Entropy 10, no. 3: 183-199.