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Título:	Sonochemical synthesis and stabilization of concentrated antimicrobial silver-chitosan nanoparticle dispersions
Autor/a:	Francesko, Antonio; Petkova, Petya; Mendoza Gómez, Ernesto; Tzanov, Tzanko; Cano Fossas, Marta; Fernandes, Margarita M.
Otros autores:	Universitat Politècnica de Catalunya. Departament de Física; Universitat Politècnica de Catalunya. Departament d'Enginyeria Química; Universitat Politècnica de Catalunya. GBMI - Grup de Biotecnologia Molecular i Industrial
Abstract:	This work reports on a green synthetic route to produce concentrated aqueous dispersions of silver nanoparticles (AgNP) employing high-intensity ultrasound (US) and chitosan (CS) as a non-toxic reducing agent for Ag1 salts and AgNP stabilizer. The sonication simultaneously boosted the synthesis and improved the stability of the AgNP, capping them with CS. Hybrid AgNP-CS antimicrobial dispersions, stable for at least 6 months, were synthesized in a simple single step process. The use of US allowed for applying relatively mild processing temperatures (608C) and reaction time between 30 min and 3 h to obtain concentrated disper- sions of AgNP that otherwise could not be obtained even after 72 h under mechanical stirring at the same reaction conditions. Upon sonication spherical AgNP-CS with a size between 60 and 100 nm were generated, in contrast to the average diameter of 200 nm of the particles obtained by stirring. The antibacterial efficiency of the AgNP-CS hybrids was evaluated against the medically relevant pathogens Staphylococcus aureus and Escherichia coli. The US-synthesized AgNP-CS showed more than 3-fold higher antibacterial activity compared to the particles obtained under stirring, due to their higher concentration and smaller size.
Materia(s):	-Àrees temàtiques de la UPC::Enginyeria dels materials -Àrees temàtiques de la UPC::Enginyeria dels materials::Materials compostos -Composite materials -Nanoparticles -Bacteria -Nanocrystals -Composites -Manufacturing -Nanocrystals -Nanoparticles -Nanowires -Synthesis and processing techniques -Materials compostos -Nanopartícules -Bacteris -Nanocristalls
Derechos:	Attribution-NonCommercial-NoDerivs 3.0 Spain http://creativecommons.org/licenses/by-nc-nd/3.0/es/
Tipo de documento:	Artículo - Versión presentada Artículo
Editor:	Wiley
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