Perfluorooctanoates micelle structure

The effect of the environment on fluorine atoms in the micelle has been studied by NMR. Muller et al. [26,28,31] determined the chemical shifts of five structurally nonequivalent types of fluorine atom in salts of perfluorooctanoic acid to indicate the degree of hydrocarbonlike character of an atom in the micelle. They described the effect of the environment of CF3 numerically by the parameter Z, defined as... 

Boden et al. [172] showed that a thermodynamically independent nematic mesophase exists in the cesium perfluorooctanoate (CsPFO)-water system between 37% and 87% (w/w) H2O and 11-75°C. The nematic phase is intermediate to an isotropic micellar solution at higher temperatures and a smectic lamellar mesophase at lower temperatures. The isotropic phase consists of disk-shaped micelles. The lamellar phase has been described by a structure in which continuous lamellae of the surfactant are broken by irregular water-filled defects without interlayer correlations [182]. In the nematic phase, the aggregates make the transition from discrete disks to continuous lamellae [160,182]. Both positional and oriental order increase when the temperature is lowered. The nematic phase of CsPFO-water is stable over a wide range of concentrations without needing a cosurfactant or salt as a stabilizer. The disk-shaped micelles of the nematic phase orient with their unique axis parallel to the direction of an applied magnetic field. 

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