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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.


Related in: MedlinePlus

SEM images of nanoporous Ta2O5: (a) top view; (b) the middle of the layer; (c) nanoporous Nb2O5; (d) top view; (e) bottom view; (f) cross section of ZrO2 nanotubes.
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jfb-06-00153-f002: SEM images of nanoporous Ta2O5: (a) top view; (b) the middle of the layer; (c) nanoporous Nb2O5; (d) top view; (e) bottom view; (f) cross section of ZrO2 nanotubes.

Mentions: Figure 1a and Figure 2a show a top view of a nanoporous Ta2O5 that exhibits irregularly distributed pores with a diameter range of 35–65 nm. The thickness of this layer was 1.17 ± 0.05 μm, taking note that the sub-structure revealed multiple layers (Figure 1b and Figure 2b), as reported previously [11], where every layer exhibited a closed bottom. Figure 1c shows the cross section of the multiple layers and the arrow indicates Ta2O5 nanotubes with a length of nearly 152 ± 1 nm that formed initially after several seconds during anodization. These long nanotubes transformed into nanoporosity after several seconds during anodization and exhibited similar morphological features to other layers. A top view of the multiple layers can be observed in Figure 1d.


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

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

SEM images of nanoporous Ta2O5: (a) top view; (b) the middle of the layer; (c) nanoporous Nb2O5; (d) top view; (e) bottom view; (f) cross section of ZrO2 nanotubes.
© Copyright Policy
Related In: Results  -  Collection

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

jfb-06-00153-f002: SEM images of nanoporous Ta2O5: (a) top view; (b) the middle of the layer; (c) nanoporous Nb2O5; (d) top view; (e) bottom view; (f) cross section of ZrO2 nanotubes.
Mentions: Figure 1a and Figure 2a show a top view of a nanoporous Ta2O5 that exhibits irregularly distributed pores with a diameter range of 35–65 nm. The thickness of this layer was 1.17 ± 0.05 μm, taking note that the sub-structure revealed multiple layers (Figure 1b and Figure 2b), as reported previously [11], where every layer exhibited a closed bottom. Figure 1c shows the cross section of the multiple layers and the arrow indicates Ta2O5 nanotubes with a length of nearly 152 ± 1 nm that formed initially after several seconds during anodization. These long nanotubes transformed into nanoporosity after several seconds during anodization and exhibited similar morphological features to other layers. A top view of the multiple layers can be observed in Figure 1d.

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.


Related in: MedlinePlus