title: Confinement effects on water structure in membrane lyotropic phases.
abstract: The change of the water structure in aqueous solutions of the tri-ethyleneglycol mono n-decyl ether (C(10)E(3)) was studied by micro Raman scattering. The results obtained on the O-H stretching band show that the behavior of the hydrogen bonding (H-bonds) water network can be used as a probe to follow the lamellar (L(α)) to sponge (L(3)) phase transition. In the lamellar phase, the stack of the surfactant molecules aggregated into a two-dimensional structure (membrane) acts as a soft confinement system for the H-bond water network of which the regular tetrahedral structure is perturbed. The change of the planar organization of the membranes to a highly disordered and infinite array of bilayers in the sponge phase amplifies the surface of contact between amphiphilic surfactant and water molecules which drives a strong disruption of the regular tetrahedral H-bonding water network.
authors: Institut des Sciences de la Terre d'Orléans, CNRS-Université d'Orléans, 1A Rue de la Férolerie, 45071 Orléans Cedex 2, France. regis.guegan@univ-orleans.fr
authors: Régis
authors: R
authors: Guégan
mesh_terms: D005026:Ethylene Glycols / Q000737:chemistry*; D006860:Hydrogen Bonding; D015394:Molecular Structure; D009227:Myristic Acids / Q000737:chemistry*; D044367:Phase Transition; D012996:Solutions; D013059:Spectrum Analysis, Raman; D013501:Surface-Active Agents / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D005026:Ethylene Glycols; D009227:Myristic Acids; D012996:Solutions; D013501:Surface-Active Agents; C542169:triethyleneglycol mono n-tetradecyl ether; D014867:Water