Influencia de la incorporación de nanopartículas de Au en procesos de corrosión en recubrimientos de TiO2 obtenidos por OEP

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dc.contributor.advisorRestrepo-Parra, Elisabeth
dc.contributor.authorGarcía Gallego, Yury Paola
dc.date.accessioned2023-10-03T02:46:21Z
dc.date.available2023-10-03T02:46:21Z
dc.date.issued2022
dc.descriptiongraficas, ilustraciones, tablasspa
dc.description.abstractEn el presente trabajo se describe la influencia de la incorporación de nanopartículas de oro (AuNPs) en procesos de corrosión a recubrimientos de titanio, obtenidos por oxidación electrolítica por plasma (OEP), en el cual, se planteó variar la concentración de nanopartículas de oro (3,75ppm Au; 7,5ppm Au; 15 ppm Au) en la solución. Las AuNPs fueron sintetizada mediante ablación láser en fase liquida. Los recubrimientos se realizaron sobre placas de titanio de 20x20x1 mm, en una solución acuosa acidificada con H2SO4 0;1M; que contenía la variación de la concentración de las AuNPs. La OEP se realizó en una fuente conmutada de tensión máxima de salida de 356 V, con una frecuencia de 2000 Hz, un ciclo útil del 10 % y una duración de 7 minutos. La caracterización de las AuNPs se llevó a cabo mediante varias técnicas incluyendo absorción atómica, UV-Vis y XRD. A partir de estas técnicas se encontró un tamaño de cristalito de aproximadamente de 8.9 nm y un tamaño aproximado de nanopartícula de 40-50nm. Los cambios a nivel morfológicos de los recubrimientos se determinaron mediante AFM y SEM que no hay diferencias significativas entre las muestras, los cambios a nivel composicional se efectuaron mediante XRD y XPS, evidenciando la presencia de las AuNPs no solo en la superficie del recubrimiento sino en el interior de esta. Para evaluar la resistencia a la corrosión de los recubrimientos, se utilizó espectroscopia de impedancia electroquímica y resistencia a la polarización en fluido biológico simulado. Se encontró que todas las muestras presentaban un mecanismo de corrosión mixto, que involucra tanto la corrosión de la superficie como la corrosión en el interior del recubrimiento. Sin embargo, se observó una disminución en la velocidad de corrosión de las muestras con AuNPs en comparación con la muestra sin AuNPs. Esto sugiere que la presencia de las AuNPs mejora la resistencia a la corrosión del recubrimiento. En general, este estudio proporciona una base para el desarrollo de nuevos materiales que incorporen nanopartículas de oro para mejorar la resistencia a la corrosión del titanio y, por lo tanto, su posible uso en aplicaciones biomédicas. (Texto tomado de la fuente)spa
dc.description.abstractThe present work describes the influence of the incorporation of gold nanoparticles (AuNPs) in corrosion processes of titanium coatings, obtained by electrolytic oxidation by plasma (EPO), in which, it was proposed to vary the concentration of gold nanoparticles (3.75ppm Au; 7.5ppm Au; 15 ppm Au) in the solution. The AuNPs were synthesized by laser ablation in liquid phase. The coatings were performed on 20x20x1 mm titanium plates, in an aqueous solution acidified with 0;1M H2SO4; containing the variation of AuNPs concentration. The EPO was performed on a switched-mode source with a maximum output voltage of 356 V, with a frequency of 2000 Hz, a useful cycle of 10 % and a duration of 7 min. Characterization of the AuNPs was carried out by various techniques including atomic absorption, UV-Vis and XRD. From these techniques a crystallite size of approximately 8.9 nm and an approximate nanoparticle size of 40-50nm was found. The changes at the morphological level of the coatings were determined by AFM and SEM that there are no significant differences between the samples, the changes at the compositional level were performed by XRD and XPS, evidencing the presence of AuNPs not only on the surface of the coating but also in the interior of it. To evaluate the corrosion resistance of the coatings, electrochemical impedance spectroscopy and polarization resistance in simulated biological fluid were used. All samples were found to exhibit a mixed corrosion mechanism, involving both surface corrosion and corrosion inside the coating. However, a decrease in corrosion rate was observed for the samples with AuNPs compared to the sample without AuNPs. This suggests that the presence of AuNPs improves the corrosion resistance of the coating. Overall, this study provides a basis for the development of new materials incorporating gold nanoparticles to improve the corrosion resistance of titanium and thus its potential use in biomedical applications.eng
dc.description.curricularareaCiencias Naturales.Sede Manizalesspa
dc.description.degreelevelMaestríaspa
dc.description.degreenameMagíster en Ciencias - Físicaspa
dc.format.extentxi, 47 páginasspa
dc.format.mimetypeapplication/pdfspa
dc.identifier.instnameUniversidad Nacional de Colombiaspa
dc.identifier.reponameRepositorio Institucional Universidad Nacional de Colombiaspa
dc.identifier.repourlhttps://repositorio.unal.edu.co/spa
dc.identifier.urihttps://repositorio.unal.edu.co/handle/unal/84745
dc.language.isospaspa
dc.publisherUniversidad Nacional de Colombiaspa
dc.publisher.branchUniversidad Nacional de Colombia - Sede Manizalesspa
dc.publisher.facultyFacultad de Ciencias Exactas y Naturalesspa
dc.publisher.placeManizales, Colombiaspa
dc.publisher.programManizales - Ciencias Exactas y Naturales - Maestría en Ciencias - Físicaspa
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dc.rights.accessrightsinfo:eu-repo/semantics/openAccessspa
dc.rights.licenseAtribución-NoComercial-SinDerivadas 4.0 Internacionalspa
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/spa
dc.subject.ddc530 - Físicaspa
dc.subject.proposalTécnica OEPspa
dc.subject.proposalTitaniospa
dc.subject.proposalNanopartículas de orospa
dc.subject.proposalCorrosiónspa
dc.subject.proposalBiocompatibilidadspa
dc.subject.proposalOEP techniqueeng
dc.subject.proposalTitaniumeng
dc.subject.proposalGold nanoparticleseng
dc.subject.proposalCorrosioneng
dc.subject.proposalBiocompatibilityeng
dc.titleInfluencia de la incorporación de nanopartículas de Au en procesos de corrosión en recubrimientos de TiO2 obtenidos por OEPspa
dc.title.translatedInfluence of the incorporation of Au nanoparticles on corrosion processes in TiO2 coatings obtained by PEOeng
dc.typeTrabajo de grado - Maestríaspa
dc.type.coarhttp://purl.org/coar/resource_type/c_bdccspa
dc.type.coarversionhttp://purl.org/coar/version/c_ab4af688f83e57aaspa
dc.type.contentTextspa
dc.type.driverinfo:eu-repo/semantics/masterThesisspa
dc.type.versioninfo:eu-repo/semantics/acceptedVersionspa
dcterms.audience.professionaldevelopmentBibliotecariosspa
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dcterms.audience.professionaldevelopmentMaestrosspa
dcterms.audience.professionaldevelopmentPersonal de apoyo escolarspa
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