title: Internal organisation in polyelectrolytes/oppositely charged surfactants colloidal complexes anticipating precipitated nanostructures.
abstract: In this paper, we relate the periodic nanostructures found in the colloidal complexes and the concentrated phases obtained with polyelectrolyte/surfactant aqueous solutions. We present small-angle X-ray scattering studies of the self-organisation of the anionic polymer carboxymethylcellulose with three cationic quaternary ammonium surfactants with different head and tail groups: hexadecyl trimethyl, hexadecyl ethyl dimethyl and didodecyl dimethyl ammonium bromides. We investigated the mesophases obtained above a precipitation threshold. The mixed solutions with the double-chained surfactant led to lamellar phases, in which the repeat distance only depends on the surfactant/carboxyl charge molar ratio. We show that an internal lamellar organisation already takes place in the dilute phase containing colloidal complexes found below the precipitation threshold.
authors.affiliation: Centre de Recherche sur la Matière Divisée, UMR 6619, Université d'Orléans-CNRS, 1b rue de la Férollerie, 45071 Orléans Cedex 2, France.
authors.forename: C
authors.initials: C
authors.lastname: Zhou
authors.forename: D
authors.initials: D
authors.lastname: Langevin
authors.forename: S
authors.initials: S
authors.lastname: Guillot
mesh_terms: D000838:Anions / Q000737:chemistry; D002266:Carboxymethylcellulose Sodium / Q000737:chemistry*; D002412:Cations / Q000737:chemistry; D011232:Chemical Precipitation; D003102:Colloids / Q000737:chemistry*; D004573:Electrolytes / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D033363:Neutron Diffraction; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D053838:Scattering, Small Angle; D012996:Solutions / Q000737:chemistry; D013501:Surface-Active Agents / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D000838:Anions; D002412:Cations; D003102:Colloids; D004573:Electrolytes; D000644:Quaternary Ammonium Compounds; D012996:Solutions; D013501:Surface-Active Agents; D014867:Water; D002266:Carboxymethylcellulose Sodium