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| - Scattering from Polymerlike Micelles of TDAO in Salt/Water Solutions at Semidilute Concentrations
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| - Aqueous solutions of half-ionized tetradecyldimethylamine oxide (TDAO) with 0.1 M NaCl and varyingsurfactant concentration were studied by small-angle neutron scattering. The scattering data demonstratethe presence of wormlike micelles, and an analysis based on polymer theory and the results from MonteCarlo simulations was performed. The surfactant concentrations correspond to dilute and semidilute solutionsfor the wormlike micelles. The analysis of the forward scattering demonstrates a concentration dependenceof the growth of the micelles in agreement with mean-field theory. The scattering data in the full rangeof measured scattering vectors were analyzed using a modified random phase approximation expression,and excellent agreement was found for concentrations up to 65 times the overlap concentration. The modelfitting showed that the micelles have an elliptical cross section with semiaxes of about 16 and 28 Å. Basedon the self-consistent analysis, an independent comparison between the correlation length determinedfrom the scattering data and from Monte Carlo simulations was performed as a function of the reducedconcentration.
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