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- W2022231460 abstract "Abstract The analysis of the 23Na NMR spin-lattice (R1) and spin-spin (R2) relaxation rates was performed on several two-, three-, and four-component systems of the surfactant sodium dodecyl sulphate in water, formamide, N-methyl formamide and N,N-dimethyl formamide. n-pentanol or n-octanol was used as cosurfactant, while p-xylene was added as oil to obtain some aqueous and nonaqueous microemulsions. In several systems R1 = R2, thus indicating that Na+ ions are not tightly bound to any structured interface. Whenever R1 ≠ R2 the use of a two-site model gives a reliable estimate of the dynamic parameters characterizing the motion of the Na+ ions in the bound state. It is worth noting that while, in the aqueous systems, the Na+ ions retain an octahedral coordination (Oh symmetry), a tetrahedral coordination (Td symmetry) of the Na+ ions by FM, NMF, and DMF molecules has been proposed as a reasonable explanation of the observed high-field shifts and increase in the quadrupolar coupling constant." @default.
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- W2022231460 date "1991-10-01" @default.
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- W2022231460 title "23Na NMR relaxation study of sodium dodecyl sulphate in some aqueous and nonaqueous systems" @default.
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- W2022231460 doi "https://doi.org/10.1016/0021-9797(91)90201-i" @default.
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