Abstract

We study the thermal behavior of the longitudinal spin-lattice, T 1, and the transverse spin-spin, T 2, relaxation times of the macroscopic magnetization in water/methanol solutions. Our aim is to investigate the reciprocal influence of hydrophobic effects on water properties and of hydrophilicity (via HB interactions) on the solute. Using classical NMR, we find a single characteristic correlation time τc that reflects all local structural configurations and characterizes the thermal motion effects of the magnetic nuclei on the spin-spin interaction. We find that in the supercooled regime, the correlations are stronger because the HB interactions have a lifetime long enough to sustain a stable water network. However, increasing the temperature progressively decreases the HB interaction lifetime and destroys the water clusters with a consequent decoupling in the dynamic modes of the system. In addition, at higher temperatures, the hydrophobicity becomes stronger and governs the properties of the solutions.

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