Abstract
Wormlike micelles formed with the surfactant hexaoxyethylene decyl C10E6 and tetradecyl C14E6 ethers were studied by static (SLS) and dynamic light scattering (DLS) experiments to examine variation of the micellar characteristics with uptake of n-dodecanol. The SLS results have been 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 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 surfactant weight fraction ws or with raising temperature T irrespective of the composition of n-dodecanol content in the micelles. The length of the micelles at fixed ws and T steeply increases with increasing weight fraction wd of n-dodecanol. The length of the C14E6 micelles is extremely larger than that of the C10E6 micelles. The values of d and λ−1 are found to increase with increasing wd. It has been found that the increase in λ−1 is more significant for the micelles of the surfactant molecules with shorter hydrophobic chain length.
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Einaga, Y., Ebihara, M. & Uchida, R. Wormlike Micelles of Hexaoxyethylene Decyl C10E6 and Tetradecyl C14E6 Ethers Containing n-Dodecanol. Polym J 39, 792–801 (2007). https://doi.org/10.1295/polymj.PJ2007004
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DOI: https://doi.org/10.1295/polymj.PJ2007004
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