Abstract
Abstract Proton spin-lattice relaxation times (T 1′s) of micellar solutions of the nonionic surfactant Triton X-100 (TX-100, an alkylbenzenepolyethoxy alcohol) and of mixed micellar systems of TX-100 and n-dodecanol, n-dodecylamine, dodecyltrimethylammonium chloride, or sodium dodecylsulfate were determined. The results indicate that the hydrocarbon chains of the second surfactant penetrate to the aromatic rings of the TX-100 molecules, but do not extend to the region occupied by the alkyl chains of the TX-100. Ionic cosurfactants appear to produce a general loosening of the micellar structure, presumably because of their mutual coulombic repulsion.
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