Related Experiment Video
Updated: Feb 15, 2026

Hydrophobic Salt-modified Nafion for Enzyme Immobilization and Stabilization
Published on: July 11, 2012
Hydrophobicity Varying with Temperature, Pressure, and Salt Concentration
K Koga1,2, N Yamamoto2
1Research Institute for Interdisciplinary Science , Okayama University , Okayama 700-8530 , Japan.
Abstract:
Temperature-, pressure-, and salt-concentration-induced variations in the solubility of small nonpolar solutes in aqueous solution and the corresponding variations in the solvent-induced pair attraction between such solute molecules are investigated. The variations in the solvation free energy of a solute and those in the solvent-induced pair attraction are well reproduced by a mean-field approximation in which the repulsive cores of solute molecules are treated as hard spheres and the mean-field energy of a solute molecule is taken to be the average potential energy that the solute molecule feels in solution. The mechanisms of variation in the solvation free energy and those of variation in the solvent-induced pair potential, with increasing temperature, pressure, and salt concentration, are clarified. Correlations between the solvation free energy and the solvent-induced pair potential at a contact distance in temperature, pressure, and salt concentration variations are near linear in any mode of variation, but the slope of the linear relation is dependent on the mode of variation and is determined by a ratio of the solvation thermodynamic quantities characteristic of each mode of variation.
Related Concept Videos
Determining the pH of Salt Solutions
Responses to Salt Stress
Gradually Varying Flow
Rapidly Varying Flow
Solution Concentration and Dilution
Concentration Cells
Consider the following voltaic cell:

