NMR spectroscopy study of local correlations in water

Francesco Mallamace, Carmelo Corsaro, Domenico Mallamace, Sebastiano Vasi, H. Eugene Stanley
2016 Journal of Chemical Physics  
Using nuclear magnetic resonance we study the dynamics of the hydrogen bond (HB) sub-domains in bulk and emulsified water across a wide temperature range that includes the supercooled regime. We measure the proton spin-lattice T 1 and spin-spin T 2 relaxation times to understand the hydrophilic interactions that determine the properties of water. We use (i) the Bloembergen, Purcell, and Pound approach that focuses on a single characteristic correlation time ⌧ c , and (ii) the Powles and Hubbard
more » ... approach that measures the proton rotational time ⌧ ✓ . We find that when the temperature is low both relaxation times are strongly correlated when the HB lifetime is long, and that when the temperature is high a decrease in the HB lifetime destroys the water clusters and decouples the dynamic modes of the system. Published by AIP Publishing. [http://dx.
doi:10.1063/1.4968589 pmid:28799351 fatcat:2hv73x6vq5bufchmirn73nyskq