Deconstructing Classical Water Models at Interfaces and in Bulk |
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Authors: | Richard C Remsing Jocelyn M Rodgers John D Weeks |
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Institution: | (1) Chemical Sciences Division, L-231, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA |
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Abstract: | Using concepts from perturbation and local molecular field theories of liquids we divide the potential of the SPC/E water
model into short and long ranged parts. The short ranged parts define a minimal reference network model that captures very
well the structure of the local hydrogen bond network in bulk water while ignoring effects of the remaining long ranged interactions.
This deconstruction can provide insight into the different roles that the local hydrogen bond network, dispersion forces,
and long ranged dipolar interactions play in determining a variety of properties of SPC/E and related classical models of
water. Here we focus on the anomalous behavior of the internal pressure and the temperature dependence of the density of bulk
water. We further utilize these short ranged models along with local molecular field theory to quantify the influence of these
interactions on the structure of hydrophobic interfaces and the crossover from small to large scale hydration behavior. The
implications of our findings for theories of hydrophobicity and possible refinements of classical water models are also discussed. |
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