An Analysis of the Thermodynamics of Hydrophobic Solvation Based on Scaled Particle Theory

Details An Analysis of the Thermodynamics of Hydrophobic Solvation Based on Scaled Particle Theory An Analysis of the Thermodynamics of Hydrophobic Solvation Based on Scaled Particle Theory

2001-04-25

arxiv.org/abs/physics/0104085v1

Physics

Biological Physics

13 pages

Scientific paper

A comprehensive, semi-quantitative model for the thermodynamics of hydrophobic solvation is presented. The model is based on a very simple premise suggested by the scaled particle theory and treats both solute and solvent molecules as hard spheres. A connection between the peculiarly large heat-capacity change for hydrophobic solvation and the large temperature dependence of the thermal expansivity of water is found. Analysis reveals a possible physical origin for the converging behavior of solvation entropies for a series of homologous hydrophobic compounds. The model suggests that the low solubility and the large heat-capacity change of hydrophobic solvation stem from two distinct aspects of water molecules: the static geometry of the molecule and the dynamic hydrogen bonding network, respectively.

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