Thermodynamic Anomalies Along the Isotropic-Nematic Phase Boundaries of two Component Systems

Y. Guichard Centre de Recherche Paul Pascal, Université de Bordeaux I, Domaine Universitaire, 33405, Talence Cédex, France

G. Sigaud Centre de Recherche Paul Pascal, Université de Bordeaux I, Domaine Universitaire, 33405, Talence Cédex, France

F. Hardouin Centre de Recherche Paul Pascal, Université de Bordeaux I, Domaine Universitaire, 33405, Talence Cédex, France

Abstract

The entropy and volume changes at the N-I transition have been determined in two binary systems (80CB-60CB and 8OCB-CBOOA). We give evidence for an anomaly of ΔV_NI as a function of the concentration directly related to [dT/dP]_NI at P = 1 atm. This result might be due to the influence of a critical smectic-like compacity.

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Thermodynamic Anomalies Along the Isotropic-Nematic Phase Boundaries of two Component Systems

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