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Abstract
The micellar cubic phase I1 of the dodecyltrimethylammonium chloride (C12TACl)/water system has been studied by 2H NMR spectroscopy. Relaxation rates of selectively deuteriated surfactant were measured at several frequencies down to 0.5 MHz in the temperature range 25-61°C. The results are interpreted within models for the reorientational dynamics in I1 phases and it is concluded that the remaining order after surface diffusion and aggregate rotation is small and does not vary substantially with temperature. The results are discussed in relation to the two prevailing models for the structure of these phases as suggested (separately) by Fontell and Vargas. At 0°C the 2H NMR spectrum from perdeuteriated n-dodecane solubilized in this phase shows static quadrupole splittings with a magnitude that is in good agreement with the results obtained from the analysis of the relaxation data.