El magnesio y sus aleaciones, que aún se encuentran en desarrollo, se usan en aplicaciones ortopédicas debido a su biocompatibilidad y propiedades mecánicas (similares al hueso), que los hacen adecuados para aplicaciones en biomateriales. El magnesio tiene potencial para ser usado en implantes biodegradables dada su capacidad de soportar los procesos de regeneración de tejidos. En consecuencia, se han desarrollado varias estrategias para mejorar las propiedades del magnesio. Los recubrimientos sobre magnesio se emplean para mejorar su citocompatibilidad y resistencia a la corrosión. Específicamente, el dióxido de titanio se puede usar como recubrimiento protector sobre el magnesio, con el fin de ayudar a regular la velocidad de degradación y superar algunos problemas que se encuentran cuando el magnesio es implantado en el cuerpo. Por tanto, en este artículo se realizó una revisión crítica para consolidar la literatura disponible acerca de recubrimientos de dióxido de titanio sobre aleaciones de magnesio para potenciales aplicaciones en biomateriales. En este documento se hace énfasis en los recubrimientos obtenidos por medio de la de la ruta sol-gel como técnica prometedora para aplicaciones biomédicas.
Titanium dioxide (TiO 2 ) is an attractive biomaterial for its antibacterial properties. In this paper, TiO 2 nanoparticles were co-doped with copper and nitrogen and deposited onto polypropylene (PP) by the dip-coating technique. The nanoparticles were synthesised via the sol-gel technique and co-doped by the wet impregnation method. The physicochemical properties of the samples were characterised using scanning electron microscopy (SEM), wavelength-dispersive spectrometry (WDS), x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), and ultraviolet-visible (UV-vis) spectroscopy. The band gap energy was determined using a Tauc plot. The antibacterial activity was evaluated against gram-positive, gram-negative, and multiresistant bacteria by measuring the number of colony-forming units (CFUs). All the tests were conducted in the presence of visible light. The results showed that the nanoparticles have a mean diameter of 20.40±5.50 nm. The Cu-N-doped nanoparticles showed a 23% decrease of the band gap compared to their unmodified counterparts. The PP showed homogeneous coatings with a mean thickness of 33.00±1.70 μm. The PP modified with Cu-N-doped TiO 2 exhibited strong antibacterial activity against E. coli (81%), S. aureus (98%) and methicillin-resistant S. aureus (MRSA) (97%) compared to unmodified PP. The results demonstrated the antibacterial activity of TiO 2 -Cu-N nanoparticles against gram-negative and gram-positive bacteria and their potential use in biomedical applications.
Current research trends in Mg alloys are focused on the development of smart coatings with self-healing properties that improve corrosion resistance of these alloys. Ceria based materials have recently emerged as materials that can be used as smart coatings on Mg alloys.
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