The properties of water confined in environments of low dimensionality were investigated by means of 1H magnetic resonance relaxation (NMRR) analysis. As “water-container”, a water-in-oil microemulsion, (n-hexadecane (O), K-oletae (S), n-hexanol (CoS), water (W)), was chosen because, differential scanning calorimetry (DSC) measurements showed that in this system several forms of water coexist, distinguished by the melting temperatures of 273 K “free water”, 263 K “interphasal water”, and 233 K “bound water”. — Two pairs of microemulsion systems were studied as a function of increasing water concentration (C, mass fraction), namely: (W/O, D2O/O) and (W/(deuterated oil)), (D2O/deuterated oil)). — The 1H spin-lattice and spin-spin relaxation curves were obtained at 20 MHz and 310 K. — A comparison between the trends of all best fit parameters, evaluated by two-and three-exponential analyses, was performed for both pairs of microemulsion systems.
Water/oil (W/O) microemulsion NMRR study water in microenvironments free water spin-lattice (longitudinal) relaxation spin-spin (transverse) relaxation
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