How the Liquid-Liquid Transition Affects Hydrophobic Hydration in Deeply Supercooled Water

Details How the Liquid-Liquid Transition Affects Hydrophobic Hydration in Deeply Supercooled Water How the Liquid-Liquid Transition Affects Hydrophobic Hydration in Deeply Supercooled Water

2004-11-29

arxiv.org/abs/cond-mat/0411724v3

Phys. Rev. Lett. 94, 217802 (2005)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 4 figures, twocolumn Revtex, modified text applied changes to figure 1, 2d, 3, 4

Scientific paper

10.1103/PhysRevLett.94.217802

We determine the phase diagram of liquid supercooled water by extensive computer simulations using the TIP5P-E model [J. Chem. Phys. {\bf 120}, 6085 (2004)]. We find that the transformation of water into a low density liquid in the supercooled range strongly enhances the solubility of hydrophobic particles. The transformation of water into a tetrahedrally structured liquid is accompanied by a minimum in the hydration entropy and enthalpy. The corresponding change in sign of the solvation heat capacity indicates a loss of one characteristic signature of hydrophobic hydration. The observed behavior is found to be qualitatively in accordance with the predictions of the information theory model of Garde et al. [Phys. Rev. Lett. {\bf 77}, 4966 (1996)].

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