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• W2005644574 abstract "The phase behavior of aqueous mixtures of a nonionic surfactant, hexaethylene glycol dodecyl ether (C12E6), was investigated by means of differential scanning calorimetry (DSC), Fourier transform infrared (FT-IR) spectroscopy, and 13C nuclear magnetic resonance (13C NMR) spectroscopy. The T−X phase diagram of this system was constructed from the DSC results. Comparison of the phase diagram with those previously obtained for C12E7 and C12E8 demonstrates that with the decrease in the polyoxyethylene (POE) chain length, the region of Lα phase expands toward higher temperature, whereas the H1 region shrinks toward lower temperature. This behavior is well explained in terms of the change in the critical packing parameter of the surfactant molecules associated with the change in the POE chain length. FT-IR results indicate that the ordered conformational structure of both the hydrocarbon and POE chains is kept after the transformation from solid to mesophases. The order-to-disorder transformation of the conformational structure of the chains takes place rather gradually within mesophases with the increase in temperature. This behavior of the chain melting associated with the temperature rise is common to aqueous mixtures of POE-type nonionic surfactants. 13C NMR line widths depend strongly on the phase structure formed by this mixture system: quite broad signals are observed for H1 and Lα phases, whereas the signals for V1 phase are rather sharp. According to the two-step model for NMR relaxation in aqueous surfactant systems, the line broadening observed in H1 and Lα phases is attributed to the anisometry of the molecular assemblies in these phases." @default.
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• W2005644574 date "2002-10-25" @default.
• W2005644574 modified "2023-10-16" @default.
• W2005644574 title "Aqueous Phase Behavior of Hexaethylene Glycol Dodecyl Ether Studied by Differential Scanning Calorimetry, Fourier Transform Infrared Spectroscopy, and ¹³C NMR Spectroscopy" @default.
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• W2005644574 doi "https://doi.org/10.1021/la020443b" @default.
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