The molecular structure of the interface between water and a hydrophobic substrate is liquid-vapor like
Author(s)Willard, Adam P.; Chandler, David
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With molecular simulation for water and a tunable hydrophobic substrate, we apply the instantaneous interface construction [A. P. Willard and D. Chandler, “Instantaneous liquid interfaces,” J. Phys. Chem. B114, 1954–1958 (2010)] to examine the similarity between a water-vapor interface and a water-hydrophobic surface interface. We show that attractive interactions between a hydrophobic surface and water affect capillary wave fluctuations of the instantaneous liquid interface, but these attractive interactions have essentially no effect on the intrinsic interface. The intrinsic interface refers to molecular structure in terms of distances from the instantaneous interface. Further, the intrinsic interface of liquid water and a hydrophobic substrate differs little from that of water and its vapor. The same is not true, we show, for an interface between water and a hydrophilic substrate. In that case, strong directional substrate-water interactions disrupt the liquid-vapor-like interfacial hydrogen bonding network.
DepartmentMassachusetts Institute of Technology. Department of Chemistry
The Journal of Chemical Physics
American Institute of Physics (AIP)
Willard, Adam P., and David Chandler. “The Molecular Structure of the Interface Between Water and a Hydrophobic Substrate Is Liquid-Vapor Like.” The Journal of Chemical Physics 141, no. 18 (November 14, 2014): 18C519.
Author's final manuscript