Volume-based thermodynamics of organic liquids: Surface tension and the Eotvos equation

被引:11
作者
Glasser, Leslie [1 ]
机构
[1] Curtin Univ, Curtin Inst Computat, Discipline Chem, GPO Box U1987, Perth, WA 6845, Australia
关键词
Eotvos equation; Surface tension; Surface thermodynamics; Surface entropy; Surface; Energy; IONIC SOLIDS; LATTICE ENERGIES; THERMOELASTICITY COMPRESSIBILITY; PREDICTIVE THERMODYNAMICS; HEAT-CAPACITIES; VALUES; ENTHALPIES; ENTROPIES; POLARITY; DENSITY;
D O I
10.1016/j.jct.2021.106391
中图分类号
O414.1 [热力学];
学科分类号
摘要
Many thermodynamic properties, such as entropy, lattice energy, and so forth, correlate with some function of formula volume. We here report on a recently rediscovered modified Eotvos equation which relates surface tension values to molar Gibbs surface energies, surface entropies and surface enthalpies. The resulting thermodynamic values are valuable in understanding molecular configurations of surfaces. The molar surface entropy, Delta s, in what may be considered to be a Trouton surface entropy, is roughly constant at 20 J K-1 mol(-1) compared with the Trouton entropy of (80-100) J K-1 mol(-1) for evaporation at the boiling point of liquids. Weakly-bonded molecular liquids like alkanes have a relatively large molar surface entropy, Delta s congruent to 25 J K-1 mol(-1), suggesting a loss in order on surface formation, while the rather smaller molar surface entropy, Delta s congruent to 13 J K-1 mol(-1), for the hydrogen-bonded alcohols indicates that the surface molecules are quite strongly bound to that surface. (C) 2021 Elsevier Ltd.
引用
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页数:4
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