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Amstetten, Austria

Cheng F.,University of Hull | Sajedin S.M.,University of Hull | Kelly S.M.,University of Hull | Lee A.F.,Aston University | Kornherr A.,Mondi Uncoated Fine Paper
Carbohydrate Polymers | Year: 2014

In order to inhibit the photocatalytic degradation of organic material supports induced by small titania (TiO2) nanoparticles, highly photocatalytically active, commercially available P25-TiO2 nanoparticles were first modified with a thin layer of (3-aminopropyl) triethoxysilane (APTES), which were then deposited and fixed onto the surface of paper samples via a simple, dip-coating process in water at room temperature. The resultant APTES-modified P25 TiO2 nanoparticle-coated paper samples exhibit much greater stability to UV-illumination than uncoated blank reference paper. Very little, or no, photo-degradation in terms of brightness and whiteness, respectively, of the P25-TiO2-nanoparticle-treated paper is observed. There are many other potential applications for this Green Chemistry approach to protect cellulosic fibres from UV-bleaching in sunlight and to protect their whiteness and maintain their brightness. © 2014 Elsevier Ltd. Source


Cheng F.,University of Hull | Lorch M.,University of Hull | Sajedin S.M.,University of Hull | Kelly S.M.,University of Hull | Kornherr A.,Mondi Uncoated Fine Paper
ChemSusChem | Year: 2013

To inhibit the photocatalytic degradation of organic material supports induced by small titania (TiO2) nanoparticles, four kinds of TiO 2 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. Let the sunshine in: TiO2/SiO2 core/shell nanoparticles are prepared, deposited and fixed onto the surface of cellulosic paper by a polyelectrolyte layer-by-layer approach, which significantly improves the whiteness and brightness of the paper and its stability to UV-degradation and bleaching. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Cheng F.,University of Hull | Betts J.W.,University of Hull | Kelly S.M.,University of Hull | Wareham D.W.,Queen Mary, University of London | And 4 more authors.
Journal of Materials Chemistry B | Year: 2014

Small, carboxymethyl-starch-stabilised zinc oxide nanoparticles with a defined shape, size and morphology were prepared in situ in water at relatively low reaction temperatures using soluble carboxymethyl starch (CMS) as a combined crystallising, stabilising and solubilising agent and triethanolamine as the reducing agent. Aqueous colloidal solutions of these CMS-stabilised ZnO nanoparticles were used to deposit a coating of ZnO nanoparticles on cellulose paper by a wet-chemistry, polyelectrolyte, layer-by-layer approach using water as the only solvent. Such cellulose paper samples, coated with these CMS-stabilised ZnO nanoparticles, show higher brightness and whiteness than that of blank reference paper and are more stable to UV-radiation than the paper reference as well as demonstrating good antibacterial activity against MRSA and A. baumannii. © 2014 the Partner Organisations. Source


Kornherr A.,Mondi Uncoated Fine Paper | Achatz P.,Mondi Uncoated Fine Paper | Drexler G.,Mondi Uncoated Fine Paper
International Paperworld IPW | Year: 2011

Mondi and Professor Reischl from GPR worked jointly to patent a new method called Acoustic Nano Dust Tester (ANDT) for precise determination of particulate matter emitted from paper surfaces. The emissions were analyzed according to total particle concentration, particle number size distribution, and structural and chemical properties of the emitted particles. The ANDT method was based on the generation of well defined mechanical stress due to acoustic irradiation of the sample with low-frequency sound waves of specific wave form, frequency, and amplitude. The probe sheet was localized in the very center between two particle emission free speaker membranes made of synthetic material. The air column between the speaker membranes transmitted the vibrations to the sample and deformed it mechanically by applying a periodic electric signal to the speakers. Source

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