| Autor: |
Singh, Rajiv R., Van Hook, W. Alexander |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 11/15/1987, Vol. 87 Issue 10, p6088, 9p |
| Abstrakt: |
Classical expressions for the free energy of binary mixtures do not agree with observed behavior near critical points (Tc,Xc) for liquid–liquid demixing. Very near (Tc,Xc) long-range concentration fluctuations produce logarithmic discontinuities in certain of the derivatives of the free energy and this necessitates an alternate description in terms of scaling laws. Arguments are presented that, for mixtures of small molecules, the range of such nonclassical effects is approximately (010-3 are as well or better described by classical thermodynamics as they are by scaling expressions. Classical thermodynamics also permits an accurate description of the pressure dependence of Tc and Xc, and suggests that the equal volume criterion used to locate Xc is not generally correct. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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