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Title: Molecular theory and the effects of solute attractive forces on hydrophobic interactions

Journal Article · · Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry
 [1];  [1];  [2];  [3];  [3]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Biological and Material Sciences
  2. Rice Univ., Houston, TX (United States). Dept. of Chemical and Biomolecular Engineering
  3. Tulane Univ., New Orleans, LA (United States). Dept. of Chemical and Biomolecular Engineering

The role of solute attractive forces on hydrophobic interactions is studied by coordinated development of theory and simulation results for Ar atoms in water. In this paper, we present a concise derivation of the local molecular field (LMF) theory for the effects of solute attractive forces on hydrophobic interactions, a derivation that clarifies the close relation of LMF theory to the EXP approximation applied to this problem long ago. The simulation results show that change from purely repulsive atomic solute interactions to include realistic attractive interactions diminishes the strength of hydrophobic bonds. For the Ar–Ar rdfs considered pointwise, the numerical results for the effects of solute attractive forces on hydrophobic interactions are opposite in sign and larger in magnitude than predicted by LMF theory. That comparison is discussed from the point of view of quasichemical theory, and it is suggested that the first reason for this difference is the incomplete evaluation within LMF theory of the hydration energy of the Ar pair. With a recent suggestion for the system-size extrapolation of the required correlation function integrals, the Ar–Ar rdfs permit evaluation of osmotic second virial coefficients B2. Those B2’s also show that incorporation of attractive interactions leads to more positive (repulsive) values. With attractive interactions in play, B2 can change from positive to negative values with increasing temperatures. Furthermore, this is consistent with the puzzling suggestions of decades ago that B2 ≈ 0 for intermediate cases of temperature or solute size. In all cases here, B2 becomes more attractive with increasing temperature.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program; Consortium for Ocean Leadership (United States)
Contributing Organization:
Tulane Univ., New Orleans, LA (United States); Rice Univ., Houston, TX (United States)
Grant/Contract Number:
AC04-94AL85000; SA 12-05/GoMRI-002
OSTI ID:
1237355
Alternate ID(s):
OSTI ID: 1347346
Report Number(s):
SAND-2015-20729J; SAND2015-1893J; 555995; TRN: US1600392
Journal Information:
Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry, Vol. 120, Issue 8; ISSN 1520-6106
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

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Cited By (7)

Water hydrogen degrees of freedom and the hydrophobic effect journal January 2019
Evaluation of second osmotic virial coefficients from molecular simulation following scaled-particle theory journal July 2019
Utility of chemical computations in predicting solution free energies of metal ions journal June 2017
On the behavior of the osmotic second virial coefficients of gases in aqueous solutions: Rigorous results, accurate approximations, and experimental evidence journal March 2019
Methane Hydration‐Shell Structure and Fragility journal October 2018
The water molecule arrangement over the side chain of some aliphatic amino acids: A quantum chemical and bottom‐up investigation journal January 2020
Methane Hydration‐Shell Structure and Fragility journal November 2018

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