Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 105, Issue 28, Pages 9512-9515Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0802162105
Keywords
thermodynamics; hydrophobicity; multibody potential; hydrogen-bonding network
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Pairwise additivity of the hydrophobic effect is indicated by reliable experimental Henry's constants for a large number of linear and branched low-molecular-weight alkanes in water. Pairwise additivity suggests that the hydrophobic effect is primarily a local phenomenon and that the hydrophobic interaction may be represented by a semiempirical force field. By representing the hydrophobic potential between two methane molecules as a linear function of the overlap volume of the hydration layers, we find that the contact value of the hydrophobic potential (-0.72 kcal/mol) is smaller than that from quantum mechanics simulations (-2.8 kcal/mol) but is close to that from classical molecular dynamics (-0.5 similar to-0.9 kcal/mol).
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