Authors: Aitor Urrutia Pedro J Rivero Leyre Ruete Javier Goicoechea Ignacio R Matías Francisco J Arregui
Publish Date: 2012/01/22
Volume: 290, Issue: 9, Pages: 785-792
Abstract
In this work a novel singlestage process for in situ synthesis of Ag nanoparticles NPs using the layerbylayer LbL technique is presented The Ag NPs were formed into nanotextured coatings based on sequentially adsorbed polyallylamine hydrochloride PAH and SiO2 NPs Such highly porous surfaces have been used in the fabrication of highly efficient ion release films for applications such as antibacterial coatings In this approach the amino groups of the PAH acted as reducing agent and made possible the in situ formation of the Ag NPs This reduction reaction occurred during the LbL process as the coating was assembled without any further step after the fabrication and stabilization of the multilayer film Biamminesilver nitrate was used as the Ag+ ion source during the LbL process and it was successfully reduced to Ag NPs All coatings were tested with grampositive and gramnegative bacterial cultures of Escherichia coli Staphylococcus aureus and Lactobacillus delbrueckii showing an excellent antimicrobial behavior against these types of bacteria more than 999 of killing efficiency in all casesThis work was supported in part by the Spanish Ministry of Education and Science—CICYTFEDER TEC201017805 Research Grant and the Fuentes Dutor Foundation research grant managed by COIINA The authors also want to thank FIDENA foundation for the EDX measurements
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