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Fabrication and Characterization of Nanoporous Niobia, and Nanotubular Tantala, Titania and Zirconia via Anodization.

Minagar S, Berndt CC, Wen C - J Funct Biomater (2015)

Bottom Line: Therefore, four kinds of metal oxide nanoporous and nanotubular Ta2O5, Nb2O5, ZrO2 and TiO2 were fabricated via anodization.It was found that the nanoporous Ta2O5 exhibited an irregular porous structure, high roughness and high surface energy as compared to bare tantalum metal; and exhibited the most superior bioactivity after annealing among the four kinds of nanoporous structures.The nanoporous Nb2O5 showed a uniform porous structure and low roughness, but no bioactivity before annealing.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia. sminagar@swin.edu.au.

ABSTRACT
Valve metals such as titanium (Ti), zirconium (Zr), niobium (Nb) and tantalum (Ta) that confer a stable oxide layer on their surfaces are commonly used as implant materials or alloying elements for titanium-based implants, due to their exceptional high corrosion resistance and excellent biocompatibility. The aim of this study was to investigate the bioactivity of the nanostructures of tantala (Ta2O5), niobia (Nb2O5), zirconia (ZrO2) and titania (TiO2) in accordance to their roughness and wettability. Therefore, four kinds of metal oxide nanoporous and nanotubular Ta2O5, Nb2O5, ZrO2 and TiO2 were fabricated via anodization. The nanosize distribution, morphology and the physical and chemical properties of the nanolayers and their surface energies and bioactivities were investigated using SEM-EDS, X-ray diffraction (XRD) analysis and 3D profilometer. It was found that the nanoporous Ta2O5 exhibited an irregular porous structure, high roughness and high surface energy as compared to bare tantalum metal; and exhibited the most superior bioactivity after annealing among the four kinds of nanoporous structures. The nanoporous Nb2O5 showed a uniform porous structure and low roughness, but no bioactivity before annealing. Overall, the nanoporous and nanotubular layers of Ta2O5, Nb2O5, ZrO2 and TiO2 demonstrated promising potential for enhanced bioactivity to improve their biomedical application alone or to improve the usage in other biocompatible metal implants.

No MeSH data available.


XRD patterns of (a) the nanoporous Ta2O5 and bare tantalum foil; (b) the nanoporous Nb2O5 and bare niobium foil; (c) the ZrO2 nanotubes and bare zirconium foil; and (d) the TiO2 nanotubes and bare titanium foil.
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jfb-06-00153-f005: XRD patterns of (a) the nanoporous Ta2O5 and bare tantalum foil; (b) the nanoporous Nb2O5 and bare niobium foil; (c) the ZrO2 nanotubes and bare zirconium foil; and (d) the TiO2 nanotubes and bare titanium foil.

Mentions: Nanoporous Ta2O5 with a mixture of amorphous and hexagonal phase was fabricated via anodization under the conditions of 1 M H2SO4 + 3.3 wt % NH4F, 20 V for 120 min. The amorphous nanoporous Ta2O5 transformed into hexagonal Ta2O5 after annealing at 290 °C for 10 min, as indicated by the XRD patterns in Figure 5a. After annealing the pore size decreased to within the range of 23–49 nm as a result of completion of crystallization. Annealing increased the hydrophilic properties of nanoporous Ta2O5 layer but as much as TiO2 nanotubes because of their different porosity due to their structures.


Fabrication and Characterization of Nanoporous Niobia, and Nanotubular Tantala, Titania and Zirconia via Anodization.

Minagar S, Berndt CC, Wen C - J Funct Biomater (2015)

XRD patterns of (a) the nanoporous Ta2O5 and bare tantalum foil; (b) the nanoporous Nb2O5 and bare niobium foil; (c) the ZrO2 nanotubes and bare zirconium foil; and (d) the TiO2 nanotubes and bare titanium foil.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4493505&req=5

jfb-06-00153-f005: XRD patterns of (a) the nanoporous Ta2O5 and bare tantalum foil; (b) the nanoporous Nb2O5 and bare niobium foil; (c) the ZrO2 nanotubes and bare zirconium foil; and (d) the TiO2 nanotubes and bare titanium foil.
Mentions: Nanoporous Ta2O5 with a mixture of amorphous and hexagonal phase was fabricated via anodization under the conditions of 1 M H2SO4 + 3.3 wt % NH4F, 20 V for 120 min. The amorphous nanoporous Ta2O5 transformed into hexagonal Ta2O5 after annealing at 290 °C for 10 min, as indicated by the XRD patterns in Figure 5a. After annealing the pore size decreased to within the range of 23–49 nm as a result of completion of crystallization. Annealing increased the hydrophilic properties of nanoporous Ta2O5 layer but as much as TiO2 nanotubes because of their different porosity due to their structures.

Bottom Line: Therefore, four kinds of metal oxide nanoporous and nanotubular Ta2O5, Nb2O5, ZrO2 and TiO2 were fabricated via anodization.It was found that the nanoporous Ta2O5 exhibited an irregular porous structure, high roughness and high surface energy as compared to bare tantalum metal; and exhibited the most superior bioactivity after annealing among the four kinds of nanoporous structures.The nanoporous Nb2O5 showed a uniform porous structure and low roughness, but no bioactivity before annealing.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia. sminagar@swin.edu.au.

ABSTRACT
Valve metals such as titanium (Ti), zirconium (Zr), niobium (Nb) and tantalum (Ta) that confer a stable oxide layer on their surfaces are commonly used as implant materials or alloying elements for titanium-based implants, due to their exceptional high corrosion resistance and excellent biocompatibility. The aim of this study was to investigate the bioactivity of the nanostructures of tantala (Ta2O5), niobia (Nb2O5), zirconia (ZrO2) and titania (TiO2) in accordance to their roughness and wettability. Therefore, four kinds of metal oxide nanoporous and nanotubular Ta2O5, Nb2O5, ZrO2 and TiO2 were fabricated via anodization. The nanosize distribution, morphology and the physical and chemical properties of the nanolayers and their surface energies and bioactivities were investigated using SEM-EDS, X-ray diffraction (XRD) analysis and 3D profilometer. It was found that the nanoporous Ta2O5 exhibited an irregular porous structure, high roughness and high surface energy as compared to bare tantalum metal; and exhibited the most superior bioactivity after annealing among the four kinds of nanoporous structures. The nanoporous Nb2O5 showed a uniform porous structure and low roughness, but no bioactivity before annealing. Overall, the nanoporous and nanotubular layers of Ta2O5, Nb2O5, ZrO2 and TiO2 demonstrated promising potential for enhanced bioactivity to improve their biomedical application alone or to improve the usage in other biocompatible metal implants.

No MeSH data available.