Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2005-07-05
Physics
Condensed Matter
Soft Condensed Matter
31 pages, 14 figures
Scientific paper
10.1103/PhysRevE.72.051503
We perform molecular dynamics simulations of 512 water-like molecules that interact via the TIP5P potential and are confined between two smooth hydrophobic plates that are separated by 1.10 nm. We find that the anomalous thermodynamic properties of water are shifted to lower temperatures relative to the bulk by $\approx 40$ K. The dynamics and structure of the confined water resemble bulk water at higher temperatures, consistent with the shift of thermodynamic anomalies to lower temperature. Due to this $T$ shift, our confined water simulations (down to $T = 220$ K) do not reach sufficiently low temperature to observe a liquid-liquid phase transition found for bulk water at $T\approx 215$ K using the TIP5P potential. We find that the different crystalline structures that can form for two different separations of the plates, 0.7 nm and 1.10 nm, have no counterparts in the bulk system, and discuss the relevance to experiments on confined water.
Buldyrev Sergey V.
Giovambattista Nicolas
Kumar Pradeep P.
Stanley Eugene H.
Starr Francis W.
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