Dynamic Behavior of Water in Lyotropic Ternary Mixtures

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Abstract
The diffusion of water molecules in lyotropic mixtures of potassium palmitate/potassium laurate/water was investigated using pulsed-field gradient nuclear magnetic resonance (PFG-NMR). The self-diffusion constant of water as a function of temperature was measured in two samples having different compositions and found to be sensitive to the structures of the different mesophases. Deuterium nuclear magnetic resonance (D-NMR) experiments were also performed on a mixture containing D2O, in a temperature rang where a rectangular mesophase (RBa ) coexists with a lamellar (La ) mesophase. The diffusion data, combined with the D-NMR spectral profiles allowed for the study of the size of the mixed mesophase domains.