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Cabal B.,Nanomaterials and Nanotechnology Research Center UO PA | Quintero F.,University of Vigo | Diaz L.A.,Nanomaterials and Nanotechnology Research Center UO PA | Rojo F.,CSIC - National Center for Biotechnology | And 4 more authors.
Technical Proceedings of the 2014 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2014 | Year: 2014

The production of organic and inorganic nanofibers with metal nanoparticles have raised great interest due to their potential applications in catalysis, environmental science and energy and biomedical technology. In this work we present a new approach to produce a nanocomposite made of non-woven silicate glass fibers containing silver nanoparticles. The process first involves the synthesis of pellets of a soda-lime silicate glass containing silver nanoparticles with varying concentration (5 and 10 wt.%). These pellets were used as a precursor for the production of the glass fibers using the laser spinning technique. Thus high form factor fibers are formed. Also, the high cooling rate produces amorphous nanofibers. These fibers exhibited diameters ranging from tens of nanometers up to several micrometers and silver nanoparticles are uniformly distributed through their whole volume. Source


Cabal B.,Nanomaterials and Nanotechnology Research Center UO PA | Quintero F.,University of Vigo | Diaz L.A.,Nanomaterials and Nanotechnology Research Center UO PA | Rojo F.,CSIC - National Center for Biotechnology | And 4 more authors.
Nanoscale | Year: 2013

Nanocomposites made of non-woven glass fibres with diameters ranging from tens of nanometers up to several micrometers, containing silver nanoparticles, were successfully fabricated by the laser spinning technique. Pellets of a soda-lime silicate glass containing silver nanoparticles with varying concentrations (5 and 10 wt%) were used as a precursor. The process followed to obtain the silver nanofibres did not agglomerate significantly the metallic nanoparticles, and the average particle size is still lower than 50 nm. This is the first time that glass nanofibres containing silver nanoparticles have been obtained following a process different from electrospinning of a sol-gel, thus avoiding the limitations of this method and opening a new route to composite nanomaterials. Antibacterial efficiency of the nanosilver glass fibres, tested against one of the most common Gram negative bacteria, was greater than 99.99% compared to the glass fibres free of silver. The silver nanoparticles are well-dispersed not only on the surface but are also embedded into the uniform nanofibres, which leads to a long lasting durable antimicrobial effect. All these novel characteristics will potentially open up a whole new range of applications. © 2013 The Royal Society of Chemistry. Source


Esteban-Tejeda L.,CSIC - Institute of Materials Science | Cabal B.,CSIC - Institute of Materials Science | Malpartida F.,CSIC - National Center for Biotechnology | Lopez-Piriz R.,Nanomaterials and Nanotechnology Research Center UO PA | And 4 more authors.
Journal of the European Ceramic Society | Year: 2012

The prevention and treatment of post-surgical infections is an ongoing concern. Post-surgical infections often cannot be treated with commercially available antibiotic-loaded bone cement as because higher doses of antibiotics are required. We describe here an approach to prevent implant infection through the use of glass coatings combined with silver nanoparticles deposited by sedimentation and heat-treated at 980 °C on titanium alloys. Silver is nontoxic to the human tissue and has been used as an anti-infective for centuries. The glass/silver coatings are composed of a soda-lime glassy matrix containing silver nanoparticles ranging from 2.6 to 20. wt.%. Optimum firing conditions have been determined for the fabrication of coatings that adhere well to the metal implant. These final coatings do not crack or delaminate. The biocidal activity of these coatings was also investigated. Coatings containing 20. wt.% of silver nanoparticles exhibited excellent biocidal activity (log η> 5) against Gram+, Gram- bacteria, and yeast after 24 h. © 2012 Elsevier Ltd. Source

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