Issue 44, 2011

Study of the ST2 model of water close to the liquid–liquid critical point

Abstract

We perform successive umbrella sampling grand canonical Monte Carlo computer simulations of the original ST2 model of water in the vicinity of the proposed liquid–liquid critical point, at temperatures above and below the critical temperature. Our results support the previous work of Y. Liu, A. Z. Panagiotopoulos and P. G. Debenedetti [J. Chem. Phys., 2009, 131, 104508], who provided evidence for the existence and location of the critical point for ST2 using the Ewald method to evaluate the long-range forces. Our results therefore demonstrate the robustness of the evidence for critical behavior with respect to the treatment of the electrostatic interactions. In addition, we verify that the liquid is equilibrated at all densities on the Monte Carlo time scale of our simulations, and also that there is no indication of crystal formation during our runs. These findings demonstrate that the processes of liquid-state relaxation and crystal nucleation are well separated in time. Therefore, the bimodal shape of the density of states, and hence the critical point itself, is a purely liquid-state phenomenon that is distinct from the crystal–liquid transition.

Graphical abstract: Study of the ST2 model of water close to the liquid–liquid critical point

Article information

Article type
Paper
Submitted
15 Jul 2011
Accepted
05 Sep 2011
First published
30 Sep 2011

Phys. Chem. Chem. Phys., 2011,13, 19759-19764

Study of the ST2 model of water close to the liquid–liquid critical point

F. Sciortino, I. Saika-Voivod and P. H. Poole, Phys. Chem. Chem. Phys., 2011, 13, 19759 DOI: 10.1039/C1CP22316J

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