A New Symmetry for the Packing of Amphiphilic Direct Micelles
Résumé
Thanks to X-ray scattering, we have studied the C12EO8/water binary system in the region located between the isotropic phase and the direct hexagonal mesophase. We have discovered two 3D-periodic phases in this region: one with a cubic symmetry (space group Pm$\bar{3}$n), the other with a hexagonal symmetry (space group P63/mmc). Both phases consist in a regular packing of direct micelles build with the surfactant molecules in water. The cubic phase have already been observed in other lyotropic systems. On the other hand, the hexagonal phase is a new type of structure for such systems. We assume for this phase a hexagonal compact structure.
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