Phase behaviour and structure of a non-ionic discoidal amphiphile in water |
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| Institution: | 1. Institute of Movement Science (ISM), CNRS, UMR 7287, Aix-Marseille University, av. de, Luminy, F-13288 Marseille France;2. Laboratory of Mechanics and Acoustics (LMA), CNRS, UPR 7051, Aix-Marseille University, Centrale Marseille, 31 chemin Joseph-Aiguier, F-13402 Marseille cedex 20, France;3. Department of Physical Therapy, College of Staten Island, City University of New York, NY 10314, United States;4. INSERM, UMR 1033, F-69008 Lyon, France;5. Université de Lyon, F-69008 Lyon, France |
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| Abstract: | The phase behaviour and structure of mixtures of a novel non-ionic discoidal amphiphile, 2,3.6,7,10,11-hexa-(1,4,7-trioxaoctyl)-triphenylene, and water have been investigated using deuterium NMR spectroscopy and X-ray diffraction. The feature of special interest is the occurrence of a nematic phase, intermediate to an isotropic micellar solution at higher temperatures and a columnar hexagonal phase at lower temperatures. This nematic phase exists over wide concentration (0.1 to 0.5 volume fraction of amphiphile) and temperature intervals. The molecules are stacked in columnar (rod-shaped) aggregates. In the isotropic micellar solution and nematic phase the length of the micelle is of the order of the centre-to-centre separation. |
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