Static and Dynamic Properties of Stretched Water

Published

July 1, 2001

Author(s)

P A. Netz, Francis W. Starr, H E. Stanley, M C. Barbosa

Abstract

We present the results of molecular dynamics simulations of the extended simple point charge (SPC/E) model of water to investigate the thermodynamic and dynamic properties of stretched and supercooled water. We locate the liquid-gas spinodal, and confirm that the spinodal pressure increases monotonically with T, supporting thermodynamic scenarios for the phase behavior of supercooled water involving a non-reentrant spinodal. The dynamics at negative pressure show a minimum in the diffusion constant D when the density is decreased at constant temperature, complementary to the known maximum of D at higher pressures. We locate the loci of minima of D relative to the spinodal, showing that the locus is inside the thermodynamically metastable regions of the phase-diagram. These dynamical results reflect the initial enhancement and subsequent breakdown of the tetrahedral structure and of the hydrogen bond network as the density decreases.

Citation

Physical Review E (Statistical, Nonlinear, and Soft Matter Physics)

Volume

v115

Pub Type

Journals

Keywords

diffusion minimum, molecular dynamics, negative pressure, simulations, spinodal, water

Citation

Netz, P. , Starr, F. , Stanley, H. and Barbosa, M. (2001), Static and Dynamic Properties of Stretched Water, Physical Review E (Statistical, Nonlinear, and Soft Matter Physics) (Accessed September 15, 2024)