%0 Journal Article
%4 dpi.inpe.br/plutao/2013/05.31.18.38
%2 dpi.inpe.br/plutao/2013/05.31.18.38.49
%@doi 10.4028/www.scientific.net/DDF.334-335.297
%@issn 1662-9507
%@issn 1012-0386
%F lattes: 5076862030728693 2 EscadaMacNakAlvAlv:2013:GrCaPh
%T Growth of calcium phosphate coating on Ti-7.5Mo alloy after anodic oxidation
%D 2013
%A Escada, A. L. A.,
%A Machado, Joćo Paulo Barros,
%A Nakazato, Roberto Zenhei,
%A Alves Claro, Ana Paula Rosifini,
%@affiliation
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@electronicmailaddress
%@electronicmailaddress joaopaulo@las.inpe.br
%B Defect and Diffusion Forum
%V 334-335
%P 297-302
%K Biomedical applications, Chemical and biologicals, Field emission scanning electron microscopy, Nanotube diameters, Nanotubes tio, Nucleation and growth, Simulated body fluids, Titanium oxide nanotubes Engineering controlled terms: Anodic oxidation, Biocompatibility, Biological materials, Calcium phosphate, Diffusion in liquids, Diffusion in solids, Medical applications, Molybdenum alloys, Nanotubes, Phosphate coatings, Sodium, Surface treatment, Titanium, Titanium compounds, Titanium oxides, X ray diffraction Engineering main heading: Titanium alloys.
%X Titanium and its alloys are widely used as biomaterials due to their mechanical, chemical and biological properties. To enhance the biocompatibility of titanium alloys, various surface treatments have been proposed. In particular, the formation of titanium oxide nanotubes layers has been extensively examined. Among the various materials for implants, calcium phosphates and hydroxyapatite are widely used clinically. In this work, titanium nanotubes were fabricated on the surface of Ti-7.5Mo alloy by anodization. The samples were anodized for 20 V in an electrolyte containing glycerol in combination with ammonium fluoride (NH4F, 0.25%), and the anodization time was 24 h. After being anodized, specimens were heat treated at 450 °C and 600°C for 1 h to crystallize the amorphous TiO2 nanotubes and then treated with NaOH solution to make them bioactive, to induce growth of calcium phosphate in a simulated body fluid. Surface morphology and coating chemistry were obtained respectively using, field-emission scanning electron microscopy (FEG-SEM), AFM and X-ray diffraction (XRD). It was shown that the presence of titanium nanotubes induces the growth of a sodium titanate nanolayer. During the subsequent in-vitro immersion in a simulated body fluid, the sodium titanate nanolayer induced the nucleation and growth of nanodimensioned calcium phosphate. It was possible to observe the formation of TiO2 nanotubes on the surface of Ti-7.5Mo. Calcium phosphate coating was greater in the samples with larger nanotube diameter. These findings represent a simple surface treatment for Ti-7.5Mo alloy that has high potential for biomedical applications.
%@language pt
%O 8th International Conference on Diffusion in Solids and Liquids Mass Transfer - Heat Transfer - Microstructure and Properties - Nanodiffusion and Nanostructured Materials, DSL 2012; Istanbul; Turkey; 25 June 2012 through 29 June 2012