Hydrogen bonding and dipole moment of water at supercritical conditions: a first-principles molecular dynamics study.
We present a first-principles molecular dynamics study of water near and above the critical point ( T = 647 K, rho = 0.32 g/cm(3)). We find that the systems undergo fast dynamics with continuous formation and breaking of H bonds. At low density, the system fragments mostly into trimers, dimers, and single molecules. At a higher density, more complex structures appear and an extended, albeit very dynamical, H-bond network can be identified. These structures have important consequences for the screening properties of the system. This offers a clue to understanding the peculiar chemical behavior of a supercritical system and allows thermodynamical tuning of its solvent properties.
Boero
M
M
Joint Research Center for Atom Technology, Angstrom Technology Partnership (JRCAT-ATP), 1-1-4 Higashi, Tsukuba-shi, Ibaraki 305-0046, Japan.
Terakura
K
K
Ikeshoji
T
T
Liew
C C
CC
Parrinello
M
M