Overlapping spheres Xα calculatons of the electron affinities and ionization potentials of ethylene,parabenzoquinone and their perfluoro derivatives |
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Authors: | N Boden PH Jackson K McMullen MC Holmes |
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Institution: | Department of Physical Chemistry, The University, Leeds LS2 9JT, UK;Division of Physics and Astronomy, The Polytechnic, Preston, UK |
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Abstract: | Microscopy and deuterium NMR spectroscopy are employed to demonstrate the existence of a thermodynamically independent nematic amphiphilic mesophase in mixtures of perfluoro-octanoate and water between 37.0 to 87.0% by weight of 2H2O and 284.0 to 348.3 K at 1 atmosphere pressure. This phase is in equilibrium with an isotropic micellar solution and a smeetic lamellars mesophase to, respectively, high and low temperatures. The lamellar to nematic transition line changes from first to second order at a tricritical point corresponding to 42.5% of 2H2O and 328.0 K, whilst the nematic to isotropic micellar solution transition is first order at all compositions. The measurements suggest the nematic phase is a solution of disc shaped micelles which orient with their unique axis parallel to the direction of an applied magnetic field. |
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