Abstract
Wormlike micelles of the surfactant hexaoxyethylene tetradecyl and decyl ethers C14E6 and C10E6 were characterized by static (SLS) and dynamic light scattering (DLS) experiments to examine effects of uptake of n-dodecane on the micellar characteristics. The SLS results have been successfully analyzed by the light scattering theory for micelle solutions to yield the molar mass Mw(c) as a function of concentration c along with the cross-sectional diameter d of the micelle. The apparent hydrodynamic radius RH,app(c) determined by DLS as a function of c has also been successfully analyzed by the fuzzy cylinder theory which takes into account the hydrodynamic and direct collision interactions among micelles, providing us with the values of the stiffness parameter λ−1. It has been found that although the micellar length Lw increases with increasing surfactant mass concentration c and the d and λ−1 values increase with increasing n-dodecane content wd, as in the case of various CiEj micelles containing n-alcohol, the values of Mw, Lw, and RH,app for all the micelles examined decrease or hardly vary with increasing wd contrary to the micelles containing n-alcohol. This finding may reflect the fact that the addition of n-dodecane into the micelles weakens hydrophilic interactions among polyoxyethylene chains of the surfactant molecules and water, making the micelles unstable, and then leading to collapse them into micelles of the smaller size.
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Ochi, M., Matsue, S. & Einaga, Y. Change in Characteristics of Wormlike Micelles of Hexaoxyethylene Tetradecyl and Decyl Ethers (C14E6 and C10E6) with Uptake of n-Dodecane. Polym J 40, 442–449 (2008). https://doi.org/10.1295/polymj.PJ2007246
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DOI: https://doi.org/10.1295/polymj.PJ2007246