TiO2 nanostructures: voltage influence in corrosion resistance and human osteosarcoma HOS cell responses

Muñoz-Mizuno, Andrea; Sandoval-Amador, A.; Cely, M.M.; Peña-Ballesteros, Darío Yesid; Hernández, Rubén J.

doi:10.17485/ijst/2018/v11i22/122201

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…Peaks corresponding to the base material (i.e., HCP or BCC) were not observed in this XRD pattern and this could be attributed to the X-ray not able to penetrate the OL and detect the base material [ 47 ]. Here the diffusion of aluminum toward OL on the surface reduced the amount of dissolved oxygen available to react with titanium [ 48 , 49 , 50 , 51 ]. Thus, at temperatures of 800 and 900 °C, the oxidized surface consisted mainly of rutile-type TiO 2 and Al 2 O 3 .…”

Section: Resultsmentioning

confidence: 99%

Oxidation Kinetics of Ti-6Al-4V Alloys by Conventional and Electron Beam Additive Manufacturing

et al. 2023

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New manufacturing processes for metal parts such as additive manufacturing (AM) provide a technological development for the aeronautical and aerospace industries, since these AM processes are a means to reduce the weight of the parts, which generate cost savings. AM techniques such as Laser Powder Bed Fusions (LPBF) and Electron Beam Fusion (EBM), provided an improvement in mechanical properties, corrosion resistance, and thermal stability at temperatures below 400 °C, in comparison to conventional methods. This research aimed to study the oxidation kinetics of Ti-6Al-4V alloys by conventional and Electron Beam Additive Manufacturing. The thermogravimetric analysis was performed at temperatures of 600 °C, 800 °C, and 900 °C, having a heating rate of 25 °C/min and oxidation time of 24 h. The microstructural analysis was carried out by thermogravimetric analysis. Thickness and morphology of oxide layers were analyzed by field emission scanning electron microscope, phase identification (before and after the oxidation process) was realized by X-ray diffraction at room temperature and hardness measurements were made in cross section. Results indicated that the oxidation kinetics of Ti-6Al-4V alloys fabricated by EBM was similar to conventional processing and obeyed a parabolic or quasi-parabolic kinetics. The samples oxidized at 600 °C for 24 h presented the lowest hardness values (from 350 to 470 HV). At oxidation temperatures of 800 and 900 °C, however, highest hardness values (from 870 close to the alpha-case interface up to 300 HV in base metal) were found on the surface and gradually decreased towards the center of the base alloy. This may be explained by different microstructures presented in the manufacturing processes.

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Section: Resultsmentioning

confidence: 99%

Oxidation Kinetics of Ti-6Al-4V Alloys by Conventional and Electron Beam Additive Manufacturing

et al. 2023

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“…Este método ha mejorado la adhesión celular de las superficies Ti y Ti6Al4V mediante la creación de patrones en las superficies. Estos patrones se convierten en un método excelente para lograr mejorar la reactividad de la superficie al generar sitios activos que favorecen la formación de apatitas y la adhesión celular [5,[7][8][9]13].…”

Section: Introductionunclassified

Capacidad de formación de apatitas de películas delgadas de hidroxiapatita modificadas por ablación láser

et al. 2019

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En este trabajo se analizó el efecto que tiene la modificación por ablación laser de superficies de hidroxiapatita sintetizados por sol gel en la capacidad de formación de apatitas mediante ensayos in vitro. Para ello se crecieron capas de titanato de sodio sobre discos de la aleación de Ti6Al4V mediante inmersión en NaOH 10 M a 60ºC durante 24 horas. Luego se prepararon los recubrimientos de hidroxiapatita utilizando como precursores el nitrato de calcio tetrahidratado y el trietil fosfito por el método sol-gel y la técnica dip-coating. Finalmente se realizó un patronamiento por medio de un láser Nd: YAG, con una energía de trabajo de 1.3 mJ. La hidroxiapatita se evaluó y caracterizó empleando las técnicas de Difracción de Rayos X, Microscopía Electrónica de Barrido y Espectroscopía de Energía Dispersiva de rayos x. Con el fin de evaluar la reactividad de las superficies se realizó una inmersión en fluido corporal simulado y se llevó a cabo análisis de absorción atómica de calcio, para observar los fenómenos de disolución y precipitación de este ion, y se determinó que las muestras tratadas a 600°C indujeron una mejor respuesta al crecimiento de apatitas, sin embargo, todos los recubrimientos presentan características que permitirían que estos recubrimientos sean usados como implantes en sustitutos óseos.

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Characterization of titanium oxide nanotubes growth through anodization in organic solvents

Lopez-Jaime

Peña-Ballesteros

Sandoval-Amador

2019

J. Phys.: Conf. Ser.

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The titanium oxide nanotubes have generated great interest in recent years because to the wide variety of applications in which they are used. The reason for this is the excellent surface properties that this material gets after of grow in the anodizing process. These properties can easily modify the electrochemical anodizing process. For this reason, we have analyzed the effect of electrolyte on the morphology and corrosion resistance of titanium oxide nanotubes grown at glycerol with 0.3% w/w ammonium fluoride and 2% v/v distilled water at 30 volts for 1 hour and ethylene glycol with 0.3% w/w ammonium fluoride and 2% v/v distilled water at 40 volts for 30 minutes. The morphology of the surfaces is observed by scanning electron microscopy. The resistance to corrosion of the samples is evaluated by potentiodynamic polarization curves in Hanks solution at 37 °C. The results of the nanotubes grew in glycerol have a length of 0.7 μm with a morphology of the bamboo type, while the nanotubes grown in ethyleneglycol they have a length of 3.3 μm and their morphology is smooth wall. Regarding the corrosion rate, it was determined that the nanotubes grown in glycerol have a higher corrosion rate. Because to these low corrosion rates it is considered that the two surfaces can be used as alternatives to modify orthopedic implant materials.

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TiO2 nanostructures: voltage influence in corrosion resistance and human osteosarcoma HOS cell responses

Cited by 3 publications

References 19 publications

Oxidation Kinetics of Ti-6Al-4V Alloys by Conventional and Electron Beam Additive Manufacturing

Oxidation Kinetics of Ti-6Al-4V Alloys by Conventional and Electron Beam Additive Manufacturing

Capacidad de formación de apatitas de películas delgadas de hidroxiapatita modificadas por ablación láser

Characterization of titanium oxide nanotubes growth through anodization in organic solvents

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