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ABSTRACT
The method recently proposed for the cmc determination in aqueous solutions of nonionic surfactants by 13 C NMR spectroscopy has been applied to solutions in heptane containing increasing amounts of water. It is possible to detect, at a water content of ca. 1.5 molecules per surfactant molecule, the formation of micelles, therefore of aggregates different from those observed, with the help of other techniques, in anhydrous heptane.