Effect of Water Hydrogen Bonding on the Solvent-Mediated "Oscillatory" Repulsion of C60 Fullerenes in Water.
The solvent-mediated interaction of C60 fullerenes in liquid water is examined by using the combination of the probabilistic hydrogen bond model with the density functional theory. This combination allows one to take into account the effect of hydrogen bonding between water molecules on their interaction with fullerenes and to construct an approximation for the distribution of water molecules in the system, which provides an efficient foundation for studying hydrophobic phenomena. Our numerical evaluations predict the solvent-induced interaction of two C60 fullerenes in water at 293 K to have an oscillatory-repulsive character (previously observed in molecular dynamics simulations) only when the vicinal water-water hydrogen bonds are slightly weaker than bulk ones. Besides indicating the direction of the energetic alteration of water-water hydrogen bonds near C60 fullerenes, our model also suggests that the hydrogen bonding ability of water plays a defining role in the solvent-mediated C60-C60 repulsion.
Department of Chemical and Biological Engineering, SUNY at Buffalo, Buffalo, New York 14260, United States.
Yuri S
YS
Djikaev
Department of Chemical and Biological Engineering, SUNY at Buffalo, Buffalo, New York 14260, United States.
Eli
E
Ruckenstein
C60 fullerene; buckminsterfullerene; hydrogen bonding; hydrophobic interaction; potential of mean force; water density profile