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Entropy 2008, 10(3), 183-199; doi:10.3390/entropy-e10030183
Article

Entropic Behavior of Binary Carbonaceous Mesophases

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Received: 28 July 2008 / Revised: 19 August 2008 / Accepted: 19 August 2008 / Published: 23 August 2008
(This article belongs to the Special Issue Configurational Entropy)
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Abstract

The Maier-Saupe model for binary mixtures of uniaxial discotic nematogens, formulated in a previous study [1], is used to compute and characterize orientational entropy [2] 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. Entropy; specific heat; discotic nematic liquid crystal; molecular weight; mixture; carbonaceous mesophase.
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Golmohammadi, M.; Rey, A.D. Entropic Behavior of Binary Carbonaceous Mesophases. Entropy 2008, 10, 183-199.

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