title: Existence and stability of new nanoreactors: highly swollen hexagonal liquid crystals.
abstract: We report the preparation of direct hexagonal liquid crystals, constituted of oil-swollen cylinders arranged on a triangular lattice in water. The volume ratio of oil over water, rho can be as large as 3.8. From the lattice parameter measured by small-angle X-ray scattering, we show that all the oil is indeed incorporated into the cylinders, thus allowing the diameter of the cylinders to be controlled over one decade range, provided that the ionic strength of the aqueous medium and rho are varied concomitantly. These hexagonal swollen liquid crystals (SLCs) have been first reported with sodium dodecyl sulfate as anionic surfactant, cyclohexane as solvent, 1-pentanol as co-surfactant, and sodium chloride as salt (Ramos, L.; Fabre, P. Langmuir 1997, 13, 13). The stability of these liquid crystals is investigated when the pH of the aqueous medium or the chemical nature of the components (salt and surfactant) is changed. We demonstrate that the range of stability is quite extended, rendering swollen hexagonal phases potentially useful for the fabrication of nanomaterials. As illustrations, we finally show that gelation of inorganic particles in the continuous aqueous medium of a SLC and polymerization within the oil-swollen cylinders of a SLC can be conducted without disrupting the hexagonal order of the system.
authors: Institut Européen des Membranes (UMR CNRS 5635), Route de Mende, 34293 Montpellier, France.
authors: Eduardo
authors: E
authors: Pena dos Santos
authors: Miriam Sanae
authors: MS
authors: Tokumoto
authors: Geetarani
authors: G
authors: Surendran
authors: Hynd
authors: H
authors: Remita
authors: Claudie
authors: C
authors: Bourgaux
authors: Philippe
authors: P
authors: Dieudonné
authors: Eric
authors: E
authors: Prouzet
authors: Laurence
authors: L
authors: Ramos