Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/200913
Type: Artigo de periódico
Title: Selective Synthesis Of Silver Nanoparticles Onto Potassium Hexaniobate: Structural Organisation With Bactericidal Properties.
Author: de Souza E Silva, Juliana Martins
Pastorello, Murilo
Kobarg, Jörg
Cardoso, Mateus Borba
Mazali, Italo Odone
Abstract: Silver-based nanocomposites are known to act as biocides against a series of microorganisms and are largely studied as an alternative to substitute conventional antibiotics that show decreasing efficacy. In this work, an eco-friendly method to synthesize silver nanoparticles assembled on the surface of hexaniobate crystals is reported. By means of ion exchange, K(+) ions of layered potassium hexaniobate were partially substituted by Ag(+) ions and the resulting material was exposed to UV light. The irradiation allowed the reduction of silver ions with consequent formation of silver nanoparticles located only on the hexaniobate surface, whereas Ag(+) ions located in the interlayer space remained in the ionic form. Increasing UV-light exposure times allowed controlling of the silver nanoparticle size. The antibacterial effects of the pristine potassium hexaniobate and of silver-containing hexaniobate samples were tested against Escherichia coli (E. coli). The antibacterial efficacy was determined to be related to the presence of silver in hexaniobate. An increasing activity against E. coli was observed with the decrease in silver nanoparticles size, suggesting that silver nanoparticles of distinct sizes interact differently with bacterial cell walls.
Subject: Anti-bacterial Agents
Cell Wall
Escherichia Coli
Metal Nanoparticles
Niobium
Oxides
Potassium
Silver
Ultraviolet Rays
Antibacterial Properties
Green Chemistry
Hexaniobate
Nanoparticles
Silver
Rights: fechado
Identifier DOI: 10.1002/cphc.201300855
Address: http://www.ncbi.nlm.nih.gov/pubmed/24323852
Date Issue: 2013
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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