The effect of decane and 1-octanol on the ternary diffusion coefficient matrix and the micelle diffusion coefficient in aqueous solutions of decaethylene glycol monododecyl ether (C12E10) has been investigated with Taylor dispersion and dynamic light scattering techniques.  Decane, thought to partition to the micelle core, has been observed to increase the micelle radius and have a negligeable effect on the micelle-micelle interaction parameter.  Octanol, thought to partition to the micelle palisade layer, has been observed to affect the micelle size, shape, and the micelle-micelle interaction parameter.   Interestingly, these solutes also elicit very different trends in the ternary diffusion coefficient matrix with solute concentration.  In both cases, the diffusivity matrix reveals suppressed solute flux down its own gradient, surfactant flux up a solute gradient, and solute flux down a surfactant gradient at all concentrations.  However, the diffusivity matrix was found to be relatively insensitive to decane concentration while strong trends were observed with 1-octanol concentration.  In this work, trends in the diffusivity matrix, measured via Taylor dispersion, are related to trends in the micelle diffusion coefficient, measured via dynamic light scattering, to provide insight into the mechanisms that drive diffusion coupling in nonionic micellar solutions with very hydrophobic solutes.<br/>

Effect of micelle structure and inter-micellar interactions on multicomponent diffusion in nonionic micellar solutions

255th National Meeting (2018)

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