Thermodynamic parameters of N-(p-n-alkoxybenzylidene)-p-n-(butyloxyanilines), (nO.O4) liquid crystal compounds — A dilatometric study |
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Authors: | D Madhavi LathaVGKM Pisipati J Lalitha KumariPV Datta Prasad |
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Institution: | a Liquid Crystal Research Centre, ECE, Department, Koneru Lakshmaiah University, Vaddeswaram, 522 502, Indiab Department of Physics, the Hindu College, Machilipatnam, 521 001, India |
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Abstract: | Different thermodynamic parameters are estimated from volume expansion coefficient, α for a number of N-(p-n-alkoxybenzylidene)-p-n-butyloxyanilines, nO.O4 compounds in isotropic phase (at TIN + 5 °C) and in liquid crystalline phases. The variation of different thermodynamic parameters with the alkoxy chain length in nO.O4 series and their variation with the temperature in individual liquid crystal compounds are discussed. The parameters like available volume (Va), inter molecular free length (Lf) and molecular radius (Mr) are also computed from density, and refractive index for these nO.O4 compounds and the nature of molecular free length and molecular radius are analyzed and discussed. |
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Keywords: | Density Liquid crystal Molecular free length Molecular radius nO O4 compounds |
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