A H-2 AND C-13 NMR MULTIFIELD RELAXATION STUDY OF AQUEOUS AGGREGATE SYSTEMS OF SODIUM DODECYL-SULFATE

In this work some aggregated systems with sodium dodecyl sulfate are studied by means of NMR relaxation. The analysis of 2H and 13C relaxation data in terms of the "two-step model" demonstrates that the addition of certain alcohols and oils to a micellar solution decreases the degree of aggregation. Generally NMR relaxation data show a close relation with the structure and for microemulsions allow confirmation of the presence of a bicontinuous structure in the four-component system with pentanol as cosurfactant and a water-in-oil droplet structure in the system with octanol. The presence of slow motions occurring over different time scales was also ascertained in all the three- and four-component systems. The usefulness of 2H relaxation at only one magnetic field in order to discriminate among different structures should be noted. © 1990.