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- W1976386419 abstract "Abstract This paper reports the effect of temperature and NaCl addition on micelle size and phase behavior in mixtures of N-decanoyl-N-methylglucamide (MEGA-10) and p-tert-octyl-phenoxy polyethylene (9.5) ether (Triton X-100 or TX100). The size of mixed micelles, as determined by dynamic light scattering (DLS), was found to increase with temperature but to be less pronounced at higher proportions of MEGA-10 in the solution. The cloud point was found to increase with an initial increase in the percentage of sugar-based surfactant in the mixture. This phase separation was sensitive to the presence of NaCl in the micellar solution, which induced a cloud point depression, thereby suggesting that the presence of electrolyte produces a marked alteration of the hydration layer of micelles. A thermodynamic analysis was performed assuming the clouding phenomenon to be a liquid–liquid phase-separation process. The resulting Δ G CP 0 values were positive for all solutions. The cloud point process was exothermic in nature for the mixed micellar system, as proven by the negative value of Δ H CP 0 . The process was more exothermic as the proportion of sugar-based surfactant in the mixed micelle increased (with and without NaCl in the solution). Furthermore, the negative values of Δ S CP 0 indicate that the association of micelles in the clouding phenomenon is entropically unfavorable. It was observed from the enthalpy–temperature plots that the change in heat capacity is negative, thus indicating the important role played by dehydration in this thermodynamic process. This study found that the enthalpy–entropy compensation relationship holds for this process. The micelle–water interactions were characterized from the compensation temperatures." @default.
- W1976386419 created "2016-06-24" @default.
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- W1976386419 date "2014-12-01" @default.
- W1976386419 modified "2023-10-16" @default.
- W1976386419 title "Micelle size modulation and phase behavior in MEGA-10/Triton X-100 mixtures" @default.
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- W1976386419 doi "https://doi.org/10.1016/j.tca.2014.11.007" @default.
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