Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 132, Issue 16, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3398466
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Funding
- National Institute of General Medical Sciences [R01GM079277]
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The Kirkwood-Buff (KB) theory of solutions is a rigorous theory of solution mixtures which relates the molecular distributions between the solution components to the thermodynamic properties of the mixture. Ideal solutions represent a useful reference for understanding the properties of real solutions. Here, we derive expressions for the KB integrals, the central components of KB theory, in ideal solutions of any number of components corresponding to the three main concentration scales. The results are illustrated by use of molecular dynamics simulations for two binary solutions mixtures, benzene with toluene, and methanethiol with dimethylsulfide, which closely approach ideal behavior, and a binary mixture of benzene and methanol which is nonideal. Simulations of a quaternary mixture containing benzene, toluene, methanethiol, and dimethylsulfide suggest this system displays ideal behavior and that ideal behavior is not limited to mixtures containing a small number of components. (C) 2010 American Institute of Physics. [doi:10.1063/1.3398466]
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