title: Polyelectrolyte films based on polysaccharides of different conformations: effects on multilayer structure and mechanical properties.
abstract: Ultrathin films were prepared with cationic poly(allylamine hydrochloride) (PAH) and two anionic polysaccharides, iota- and lambda-carrageenan, of similar chemical composition but different conformations using the layer-by-layer (LbL) technique. The study of aqueous solutions of carrageenans confirms that iota-carrageenan is at room temperature in helical conformation while lambda-carrageenan is in random coil conformation. Characterization of the multilayers by ellipsometry, circular dichroism, and AFM revealed that iota-carrageenan keeps its helical conformation within the films while lambda-carrageenan chains are in random coil conformation. Investigation of the mechanical properties of the films by performing nanoindentation experiments using force spectroscopy showed clear differences between the two films based on carrageenans of different conformations.
authors.affiliation: UMR 6522, Polymères, Biopolymères, Membranes, CNRS - Université de Rouen, Bd Maurice de Broglie, F-76821 Mont-Saint-Aignan, France.
authors.forename: Bjoern
authors.initials: B
authors.lastname: Schoeler
authors.forename: Nicolas
authors.initials: N
authors.lastname: Delorme
authors.forename: Ingo
authors.initials: I
authors.lastname: Doench
authors.forename: Gleb B
authors.initials: GB
authors.lastname: Sukhorukov
authors.forename: Andreas
authors.initials: A
authors.lastname: Fery
authors.forename: Karine
authors.initials: K
authors.lastname: Glinel
mesh_terms: D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D002351:Carrageenan / Q000737:chemistry*; D002412:Cations / Q000737:chemistry; D004573:Electrolytes; D008567:Membranes, Artificial; D008969:Molecular Sequence Data; D011073:Polyamines / Q000737:chemistry*; D011134:Polysaccharides / Q000737:chemistry*; D013696:Temperature
chemical_list: D002412:Cations; D004573:Electrolytes; D008567:Membranes, Artificial; D011073:Polyamines; D011134:Polysaccharides; C063994:polyallylamine; D002351:Carrageenan