Abstract
The system dodecylammonium chloride/D2O has been investigated between 25°C and 70°C by 2H and 17O NMR of deuterium oxide. From the quadrupolar splittings of these nuclei, two different phases, which are macros-copically oriented by the magnetic field, have been detected: lamellar and lyotropic nematic. The latter appears only at low surfactant concentrations as an intermediate between the micellar medium and the lamellar phase. The evolution of quadrupolar splittings with concentration can be rationalized by means of a fast exchange two site model (free water and water bound to surfactant polar heads). In the lamellar phase, splittings decrease with temperature. This can be interpreted either by a tendency of water molecules to orient their symmetry axis parallel to the phase director, or by a decrease of the number of water molecules per polar head. Regardless of temperature and concentration, the ratio of 17O and 2H quadrupolar splittings is remarkably constant: Δo/ΔD = 7.13. This can be tentatively explained by an orienting potential depending solely on the angle between the phase director and the molecular symmetry axis.
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Robin-Lherbier, B., Canet, D., Marchal, J.P., Brondeau, J. (1984). Water 2H anD 17O NMR in Dodecylammonium Chloride/D2O Lyotropic Mesophases. In: Mittal, K.L., Lindman, B. (eds) Surfactants in Solution. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-2280-9_6
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