Density Measurements and Thermodynamic Parameters of 4,4′-Dibutoxyazoxybenzene

Abstract

Thermodynamic functions using the coefficient of volume expansion (α) of a system, a number of thermoacoustic and anharmonic parameters such as the isochoric temperature coefficient of internal pressure (X), isochoric temperature coefficient of volume expansivity (X′), reduced compressibility (β∼), reduced volume (V ∼), isothermal microscopic Gruneisen parameter (Γ), fractional free volume (f), and Sharma parameter (So) can be investigated. The temperature dependence of these parameters gives a basic understanding about the intermolecular interactions in general. These studies also can applied to a solute in dilute solutions. In the present study these different parameters have been determined using volumetric measurements in the case of a liquid crystal, namely, 4,4′-dibutoxy azoxy benzene (HPOAB), which is a typical liquid crystal with a nearly linear structure, in dilute solutions at different temperatures. Variations in various parameters with respect to temperature are discussed in the light of the results obtained. The variation of the properties is analyzed and discussed in this article.