NMR Study of Water Structure in Supercritical States (INTERFACE SCIENCE-Solutions and Interfaces)

摘要

The proton chemical shift of water is measured at temperatures up to 400°C and densities of 0.19, 0.41, 0.49, and 0.60 g/cm3. The magnetic susceptibility correction is made in order to express the chemical shift relative to an isolated water molecule in the gas phase. Comparison of the observed chemical shift to that of a solitary water molecule in an organic solvent shows that the hydrogen bonding persists in the supercritical water. At each density, the strength of the hydrogen bonding is found to reach a plateau value at high temperatures.