title: Fabrication of transparent and ultraviolet shielding composite films based on graphene oxide and cellulose acetate.
abstract: Graphene oxide (GO) has been considered a promising filler material for building polymeric nanocomposites because of its excellent dispersibility and high surface area. In this work, we present the fabrication and characterization of transparent and ultraviolet (UV) shielding composite films based on GO and cellulose acetate (CA). GO sheets were found to be well-dispersed throughout the CA matrix, providing smooth and homogeneous composite films. Moreover, the GO sheets were completely embedded within the CA matrix and no presence of this nanomaterial was found at the surface. Nevertheless, CAGO composite films offered an improved high energy light-shielding capacity when compared to pristine CA films. Particularly for UVC irradiation, the CAGO film containing 0.50wt% GO displayed a UV-shielding capacity of 57%, combined with 79% optical transparency under visible light. These CAGO composite films can be potentially applied as transparent UV-protective coatings for packing biomedical, pharmaceutical, and food products.
authors.affiliation: Laboratory of Solid State Chemistry, Institute of Chemistry, University of Campinas, PO Box 6154, 13083-970 Campinas, SP, Brazil. Electronic address: anacmmo@gmail.com.
authors.forename: Ana Carolina Mazarin
authors.initials: AC
authors.lastname: de Moraes
authors.affiliation: Institute of Chemistry, University of Campinas, PO Box 6154, 13083-970 Campinas, SP, Brazil.
authors.forename: Patricia Fernanda
authors.initials: PF
authors.lastname: Andrade
authors.affiliation: Laboratory of Solid State Chemistry, Institute of Chemistry, University of Campinas, PO Box 6154, 13083-970 Campinas, SP, Brazil.
authors.forename: Andreia Fonseca
authors.initials: AF
authors.lastname: de Faria
authors.affiliation: Laboratory of Solid State Chemistry, Institute of Chemistry, University of Campinas, PO Box 6154, 13083-970 Campinas, SP, Brazil.
authors.forename: Mateus Batista
authors.initials: MB
authors.lastname: Simões
authors.affiliation: Department of Physics, Federal University of Ceará, PO Box 6030, 60455-900 Fortaleza, CE, Brazil.
authors.forename: Francisco Carlos Carneiro Soares
authors.initials: FC
authors.lastname: Salomão
authors.affiliation: Department of Physics, Federal University of Ceará, PO Box 6030, 60455-900 Fortaleza, CE, Brazil.
authors.forename: Eduardo Bedê
authors.initials: EB
authors.lastname: Barros
authors.affiliation: Institute of Chemistry, University of Campinas, PO Box 6154, 13083-970 Campinas, SP, Brazil.
authors.forename: Maria do Carmo
authors.initials: Mdo C
authors.lastname: Gonçalves
authors.affiliation: Laboratory of Solid State Chemistry, Institute of Chemistry, University of Campinas, PO Box 6154, 13083-970 Campinas, SP, Brazil. Electronic address: oalves@iqm.unicamp.br.
authors.forename: Oswaldo Luiz
authors.initials: OL
authors.lastname: Alves
mesh_terms: D002482:Cellulose / Q000031:analogs & derivatives* / Q000737:chemistry; D006108:Graphite / Q000737:chemistry*; D018625:Microscopy, Atomic Force; D053761:Nanocomposites / Q000737:chemistry* / Q000648:ultrastructure; D010087:Oxides / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D044366:Transition Temperature; D014466:Ultraviolet Rays
chemical_list: D010087:Oxides; C005062:acetylcellulose; D006108:Graphite; D002482:Cellulose
keywords: Cellulose acetate; Composite films; Graphene oxide; Ultraviolet shielding