Abstract
Variation of characteristics of the wormlike micelles formed with the surfactant pentaoxyethylene dodecyl ether C12E5 with uptake of n-dodecanol were examined by static (SLS) and dynamic light scattering (DLS) experiments. The SLS results have been analyzed with the aid of 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 is also successfully analyzed by a fuzzy cylinder theory which takes into account the hydrodynamic and direct collision interactions among micelles, allowing us to evaluate the stiffness parameter λ−1. It has been found that the micellar length increases with increasing concentration c or with raising temperature T irrespective of the composition of the C12E5 + n-dodecanol system. The length of the micelles at fixed c and T steeply increases with increasing weight fraction wd of n-dodecanol. The values of d and λ−1 are found to increase with increasing wd. On the other hand, the spacing s between the hydrophilic tails of adjacent surfactant molecules on the micellar surface decreased with wd. It has been shown for the C12E5, C10E5, and C12E6 that the values d, s, and λ−1 are substantially independent of the hydrophobic and hydrophilic chain length of the surfactant molecules.
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Miyake, M., Einaga, Y. Characterization of Wormlike Pentaoxyethylene Dodecyl Ether C12E5 Micelles Containing n-Dodecanol. Polym J 39, 783–791 (2007). https://doi.org/10.1295/polymj.PJ2006276
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DOI: https://doi.org/10.1295/polymj.PJ2006276