Chromatographic study of the thermodynamics of solutions of hydrocarbons in liquid crystal solvents. Evidence for order disturbance by the solutes |
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Authors: | H. Klunder C. L. de Ligny |
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Affiliation: | (1) Laboratory for Analytical Chemistry, University of Utrecht, Croesestraat 77a, 3522 AD Utrecht, The Netherlands |
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Abstract: | Gas-chromatographic experiments were carried out in various phases of the solvents 4-acetoxy-N-[4-methoxy-benzylidene]-aniline, dibutoxyazoxybenzene, lithium stearate, dihexoxyazoxybenzene, and diheptoxyazoxybenzene. The solutes were linear, branched and cyclic alkanes, and substituted benzenes. Excess enthalpies, entropies, and free entropies were calculated from net retention volumes. In the nematic liquid crystalline phases the effect of order disturbance was significant in and but it was, by enthalpy-entropy compensation, not demonstrable in. Differences in flexibility and degree of expansion of the solutes did not result in significantly different values of the excess quantities. |
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Keywords: | Liquid crystals gas-chromatography orientational order excess thermodynamic data alkanes substituted benzenes |
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