title: Influence of the interface on the optical activity of confined glucose films.
abstract: We report on the time evolution of the optical activity of a thinning liquid film containing glucose, and confined between two glass slides. This dynamics strongly depends on the presence of surfactant molecules. With sodium dodecyl sulfate (SDS), we evidence favorable interactions of sugar molecules with the sulfate group. As previously observed for a freely suspended soap film in the air (see Emile et al., 2013), this corresponds to an anchoring of glucose molecules at the interface. For glucose alone, we also highlight a molecular rearrangement that is not instantaneous and occurs after several minutes. This interfacial organization leads to an unusual giant optical activity that is different with or without SDS. Molecular simulations confirm the anchoring of the glucose molecules at the glass/liquid interface, and show a different molecular orientation in each case.
authors.affiliation: Université de Rennes 1, Campus de Beaulieu, 35042 Rennes, France. Electronic address: olivier.emile@univ-rennes1.fr.
authors.forename: Olivier
authors.initials: O
authors.lastname: Emile
authors.affiliation: Institut de Physique de Rennes, CNRS UMR 6521, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes, France.
authors.forename: Janine
authors.initials: J
authors.lastname: Emile
authors.affiliation: Institut de Physique de Rennes, CNRS UMR 6521, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes, France.
authors.forename: Aziz
authors.initials: A
authors.lastname: Ghoufi
mesh_terms: D005947:Glucose / Q000737:chemistry*; D009904:Optical Rotation; D010316:Particle Size; D012825:Silicon / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D005947:Glucose; D012825:Silicon
keywords: Interfacial interaction; Molecular simulations; Optical activity; Sugar-containing film