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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Influence of morphology and crystalline structure of TiO2 nanotubes on their electrochemical properties and apatite-forming ability

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Author(s):
Hilario, Fanny ; Roche, Virginie ; Nogueira, Ricardo Pereira ; Jorge Junior, Alberto Moreira
Total Authors: 4
Document type: Journal article
Source: Electrochimica Acta; v. 245, p. 329-341, AUG 10 2017.
Web of Science Citations: 20
Abstract

To study the synergetic influence of TiO2 nanotubes (NTs) morphology and crystalline structure on their electrochemical performances and apatite-forming ability, various sizes of nanotubes were synthesized via anodic oxidation of Ti and then annealed at different temperatures. XRD analysis and SEM observations confirmed that as-anodized amorphous nanotubes crystallize into anatase phase when annealed at 450 degrees C and into a mixture of anatase and rutile when annealed at 550 degrees C, without significant morphological modifications. Corrosion resistance was assessed by Open Circuit Potential measurements (OCP) and by potentiodynamic polarization curves while apatite-forming ability was evaluated by measuring the amount of Hydroxyapatite (HAp) precipitated on samples surfaces when soaked in Simulated Body Fluid (SBF) solution. Experiments confirmed that anodized titanium possesses much better corrosion resistance and bioactivity than flat Ti substrate and that annealed nanotubes are more suitable for biomedical applications than amorphous ones. Additionally, this study highlights paradoxical features such as plain anatase structure showed high bioactivity, but a mixed structure was preferable because of its synergistically better chemical stability and mechanical properties. Longer nanotubes had high corrosion resistance, but their apatite-forming ability after 14 days was poor; shorter nanotubes were less corrosion resistant, but induced thicker layer of HAp when immersed in SBF. Finally, the best compromise for implants surfaces was discussed regarding thermal, mechanical, electrochemical, chemical and bioactive properties. (C) 2017 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 12/13179-6 - Study of amorphous, metastable and nano-structured metallic alloys with emphasis on new technological applications
Grantee:Alberto Moreira Jorge Junior
Support type: Scholarships abroad - Research