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| - Viscoelastic Wormlike Micellar Solutions Made from Nonionic Surfactants: StructuralInvestigations by SANS and DLS
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| - A highly viscoelastic micellar solution of nonionic surfactants in a dilute region was recently reported. Atransient network of wormlike micelles formed with the addition of short-EO-chain poly(oxyethylene) dodecylether surfactants (C12EOj, j = 1−4) to poly(oxyethylene) cholesteryl ethers (ChEOm, m = 10 and 15). Agradual increase in micellar length with an increasing C12EOj concentration was assumed from the results ofmodel calculations and rheological measurements. We report in this study the results of structural investigationswith small-angle neutron scattering (SANS) to confirm this assumption. Tuning from spherical to wormlikeand to locally flat structures can be achieved by way of three methods. One can either increase the C12EOjconcentration or decrease j (smaller headgroup size) at a fixed concentration of C12EOj. The third possibilityis to increase the temperature at a fixed composition. All three methods result in the same structural transition.The formation of a transient network of wormlike micelles analogous to polymer solutions can be observedwith dynamic light scattering (DLS). A stretched exponential approach was applied to fit the correlationfunctions.
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