Antibacterial paper based on composite coatings of nanofibrillated cellulose and ZnO
authors Martins, NCT; Freire, CSR; Neto, CP; Silvestre, AJD; Causio, J; Baldi, G; Sadocco, P; Trindade, T
nationality International
journal COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
author keywords Nanofibrillated cellulose; Zinc oxide; Nanocomposites; Paper coating; Antibacterial activity
keywords OXIDE NANOPARTICLES; SILVER; FUNCTIONALIZATION; SUSPENSIONS; INHIBITION; GENERATION; BACTERIAL; SURFACES; FIBERS; GROWTH
abstract New composites of nanofibrillated cellulose (NFC) and ZnO nanoparticles (NP) have been prepared by electrostatic assembly in aqueous medium and using polyelectrolytes as macromolecular linkers. Selected NFC/ZnO systems were employed as fillers in starch based coating formulations for Eucalyptus globulus-based paper sheets. Using this method, antibacterial paper with low content of ZnO (<0.03%) and slight improvements in air permeability and mechanical properties were obtained. The antibacterial activity of the ZnO/NFC coatings was investigated namely by submitting paper samples to solar light exposure and dark conditions. In both conditions, the paper samples have shown bacteriostatic and/or bactericidal activity against Gram positive (Staphylococcus aureus and Bacillus cereus) and Gram negative (Klebsiella pneumoniae) bacteria. These results seem to support that the mechanism for ZnO antimicrobial activity is not mediated only by the photoactivity of the semiconductor but also by oxidizing species formed at the particles surfaces. (C) 2012 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0927-7757
year published 2013
volume 417
beginning page 111
ending page 119
digital object identifier (doi) 10.1016/j.colsurfa.2012.10.042
web of science category Chemistry, Physical
subject category Chemistry
unique article identifier WOS:000313919700014

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