Abstract
Abstract 1H NMR longitudinal relaxation times (T1obs) of water in supercritical carbon dioxide were precisely measured as a function of water concentration (c) at 313.3 K and at 10 and 20 Mpa. 1/T1obs linearly decreased with increasing c up to ∼12 mol m−3, and then was less sensitive to c. Because the spin-rotation interaction is the predominant mechanism in T1obs, the concentration dependence reflects a change in the hydrogen bonding structure between water molecules in the solutions.
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