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- W2074009002 abstract "The surface and bulk properties of salt-free catanionic surfactant mixtures of a zwitterionic surfactant (tetradecyldimethylaminoxide, C14DMAO), and two partially fluorinated carboxylic acids (C6F13C2H4OC2H4COOH, TFOPA and C8F17C2H4OC2H4COOH, HFDPA) in aqueous solutions were studied. Surface tension measurements showed that strong synergism existed when C14DMAO was mixed with TFOPA or HFDPA, which induces a lower critical micellar concentration (cmc) and a lower surface tension at cmc (γcmc) compared to the individual surfactants. The phase behavior of both C14DMAO/TFOPA and C14DMAO/HFDPA systems in bulk aqueous solution is rich. When the molar ratio of TFOPA (or HFDPA) to C14DMAO was increased, an isotropic L1 phase, an L1/Lα two-phase region, a single Lα phase, and an L1/precipitate two-phase region, were successively observed. At a C14DMAO concentration of 300 mmol L−1, the formation of gels that contain densely packed vesicles occurred. Rheological measurements showed that the viscoelasticity of the vesicle gels depends on the mixing molar ratio of the anionic surfactant to C14DMAO and total surfactant concentration, but is almost independent of temperature. IR spectra indicate that the hydrocarbon chains adopt a highly ordered all-trans conformation while the fluorinated chains adopt a disordered gauche conformation. Differential scanning calorimetry (DSC) measurements showed that the alkyl chains are mainly in a liquid crystalline state at room temperature." @default.
- W2074009002 created "2016-06-24" @default.
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- W2074009002 date "2014-09-03" @default.
- W2074009002 modified "2023-09-22" @default.
- W2074009002 title "Synergism and formation of vesicle gels in salt-free catanionic hydrocarbon/fluorocarbon surfactant mixtures" @default.
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- W2074009002 doi "https://doi.org/10.1039/c4ra07794f" @default.
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