Electrostatic assembly of Ag nanoparticles onto nanofibrillated cellulose for antibacterial paper products
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Nanofibrillated cellulose offers new technological solutions for the development of paper products. Here, composites of nanofibrillated cellulose (NFC) and Ag nanoparticles (NP) were prepared for the first time via the electrostatic assembly of Ag NP (aqueous colloids) onto NFC. Distinct polyelectrolytes have been investigated as macromolecular linkers in order to evaluate their effects on the building-up of Ag modified NFC and also on the final properties of the NFC/Ag composite materials. The NFC/Ag nanocomposites were first investigated for their antibacterial properties towards S. aureus and K. pneumoniae microorganisms as compared to NFC modified by polyelectrolytes linkers without Ag. Subsequently, the antibacterial NFC/Ag nanocomposites were used as fillers in starch based coating formulations for Eucalyptus globulus-based paper sheets. The potential of this approach to produce antimicrobial paper products will be discussed on the basis of complementary optical, air barrier and mechanical data.
KeywordsNanofibrillated cellulose Silver colloids Nanocomposites Paper coating Antibacterial activity
The research leading to these results has received funding from the European Community’s Seventh Framework Programme under grant agreement no. 228802. The authors thank the Centre Technique du Papier (France) for supplying the NFC used in this work. We thank RAIZ- Centro de Investigação da Floresta e do Papel (Portugal) for all the facilities provided in the paper coating experiments. Ricardo J.B. Pinto is grateful to FCT for a PhD grant (SFRH/BD/45364/2008). Susana C.M. Fernandes thanks FCT for funding her Postdoctoral Research Grant (SFRH/BPD/70119/2010).
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