title: Whiter, brighter, and more stable cellulose paper coated with TiO2 /SiO2 core/shell nanoparticles using a layer-by-layer approach.
abstract: To inhibit the photocatalytic degradation of organic material supports induced by small titania (TiO2 ) nanoparticles, four kinds of TiO2 nanoparticles, that is, commercial P25-TiO2 , commercial rutile phase TiO2 , rutile TiO2 nanorods and rutile TiO2 spheres, prepared from TiCl4 , were coated with a thin, but dense, coating of silica (SiO2 ) using a conventional sol-gel technique to form TiO2 /SiO2 core/shell nanoparticles. These core/shell particles were deposited and fixed as a very thin coating onto the surface of cellulose paper samples by a wet-chemistry polyelectrolyte layer-by-layer approach. The TiO2 /SiO2 nanocoated paper samples exhibit higher whiteness and brightness and greater stability to UV-bleaching than comparable samples of blank paper. There are many potential applications for this green chemistry approach to protect cellulosic fibres from UV-bleaching in sunlight and to improve their whiteness and brightness.
authors.affiliation: Department of Chemistry, University of Hull, Cottingham Road, Hull, HU6 7RX, United Kingdom.
authors.forename: Fei
authors.initials: F
authors.lastname: Cheng
authors.forename: Mark
authors.initials: M
authors.lastname: Lorch
authors.forename: Seyed Mani
authors.initials: SM
authors.lastname: Sajedin
authors.forename: Stephen M
authors.initials: SM
authors.lastname: Kelly
authors.forename: Andreas
authors.initials: A
authors.lastname: Kornherr
mesh_terms: D002482:Cellulose / Q000737:chemistry*; D003116:Color; D055772:Green Chemistry Technology; D053758:Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology; D010209:Paper; D012822:Silicon Dioxide / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D012997:Solvents; D014867:Water; C009495:titanium dioxide; D012822:Silicon Dioxide; D002482:Cellulose; D014025:Titanium
keywords: nanoparticles; silicon; sol-gel processes; surface chemistry; titanium