title: Preparation of cellulose II and IIII films by allomorphic conversion of bacterial cellulose I pellicles.
abstract: The structural changes resulting from the conversion of native cellulose I (Cel I) into allomorphs II (Cel II) and IIII (Cel IIII) have usually been studied using powder samples from plant or algal cellulose. In this work, the conversion of Cel I into Cel II and Cel IIII was performed on bacterial cellulose films without any mechanical disruption. The surface texture of the films was observed by atomic force microscopy (AFM) and the morphology of the constituting cellulose ribbons, by transmission electron microscopy (TEM). The structural changes were characterized using solid-state NMR spectroscopy as well as X-ray and electron diffraction. The allomorphic change into Cel II and Cel IIII resulted in films with different crystallinity, roughness and hydrophobic/hydrophilicity surface and the films remained intact during all process of allomorphic conversion.
authors.affiliation: BioPol, Departamento de Química, UFPR, Cx. Postal 19081, 81531-980 Curitiba, PR, Brazil; Université Grenoble Alpes, Centre de Recherches sur les Macromolécules Végétales (CERMAV), F-38000 Grenoble, France; CNRS, CERMAV, F-38000 Grenoble, France; UMR 5628 (LMGP), CNRS and Grenoble Institute of Technology, 3 Parvis Louis Néel, F-38016 Grenoble Cedex 1, France. Electronic address: paula.tischer@pq.cnpq.br.
authors.forename: Paula C S
authors.initials: PC
authors.lastname: Faria-Tischer
authors.affiliation: BioPol, Departamento de Química, UFPR, Cx. Postal 19081, 81531-980 Curitiba, PR, Brazil; Université Grenoble Alpes, Centre de Recherches sur les Macromolécules Végétales (CERMAV), F-38000 Grenoble, France; CNRS, CERMAV, F-38000 Grenoble, France; CIME Nanotech, 3 Parvis Louis Néel, F-38016 Grenoble Cedex 1, France.
authors.forename: Cesar A
authors.initials: CA
authors.lastname: Tischer
authors.affiliation: Université Grenoble Alpes, Centre de Recherches sur les Macromolécules Végétales (CERMAV), F-38000 Grenoble, France; CNRS, CERMAV, F-38000 Grenoble, France.
authors.forename: Laurent
authors.initials: L
authors.lastname: Heux
authors.affiliation: UMR 5628 (LMGP), CNRS and Grenoble Institute of Technology, 3 Parvis Louis Néel, F-38016 Grenoble Cedex 1, France.
authors.forename: Simon
authors.initials: S
authors.lastname: Le Denmat
authors.affiliation: UMR 5628 (LMGP), CNRS and Grenoble Institute of Technology, 3 Parvis Louis Néel, F-38016 Grenoble Cedex 1, France.
authors.forename: Catherine
authors.initials: C
authors.lastname: Picart
authors.affiliation: BioPol, Departamento de Química, UFPR, Cx. Postal 19081, 81531-980 Curitiba, PR, Brazil.
authors.forename: Maria-R
authors.initials: MR
authors.lastname: Sierakowski
authors.affiliation: Université Grenoble Alpes, Centre de Recherches sur les Macromolécules Végétales (CERMAV), F-38000 Grenoble, France; CNRS, CERMAV, F-38000 Grenoble, France.
authors.forename: Jean-Luc
authors.initials: JL
authors.lastname: Putaux
mesh_terms: D001688:Biological Products / Q000737:chemistry*; D002482:Cellulose / Q000138:chemical synthesis*; D003460:Crystallization / Q000379:methods*; D041822:Gluconacetobacter xylinus / Q000378:metabolism*; D008422:Materials Testing; D008567:Membranes, Artificial
chemical_list: D001688:Biological Products; D008567:Membranes, Artificial; D002482:Cellulose
keywords: Bacterial cellulose; Cellulose II; Cellulose III; Mercerization