Markup Help 
Everything Papers Books
We report on the microscopic structure of water at sub- and supercritical conditions studied using X-ray Raman spectroscopy, ab initio molecular dynamics simulations, and density functional theory. Systematic changes in the X-ray Raman spectra with increasing pressure and temperature are observed. Throughout the studied thermodynamic range, the experimental spectra can be interpreted with a structural model obtained from the molecular dynamics simulations. A spatial statistical analysis using Ripley's K-function shows that this model is homogeneous on the nanometer length scale. According to the simulations, distortions of the hydrogen-bond network increase dramatically when temperature and pressure increase to the supercritical regime. In particular, the average number of hydrogen bonds per molecule decreases to ???0.6 at 600 ??C and p = 134 MPa.


What makes thermophilic proteins stable? And in particular, does hydration play a role? Those questions are examined by Fabio Sterpone of the Universit Paris Diderot and colleagues (O. Rahaman et al., Phys. Chem. Chem. Phys. 15, 3570; 2013 paper here). They...
Extreme water in Earth's interior - Earth is the only known planet that holds water in massive quantities and in all three of the main phase states. But the earthly, omnipresent compound water has very unusual properties that become particularly evident when...