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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.


Illustration of pore size of the nanoporous and nanotubular layer.
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jfb-06-00153-f006: Illustration of pore size of the nanoporous and nanotubular layer.

Mentions: The cubic ZrO2 nanotube was fabricated via anodization under the conditions of 1 M (NH4)2SO4 + 0.3 wt % NH4F (with the addition of H2SO4 to attain a pH = 5) at 30 V for 95 min, as indicated by the XRD patterns in Figure 5c. After annealing, the inner diameter of the nanotubes laid in the range of 20–36 nm, whilst the nanotube outer diameter (Do) was 48–68 nm and the wall thickness (Wt) was in the range of 9–11 nm. The roughness (Sa) and hydrophilic properties of ZrO2 nanotubes increased after annealing. Figure 6a shows the pore sizes of nanoporous Ta2O5 and Nb2O5, compared to TiO2 nanotube with nearly the same Di. Figure 6b,c,d shows the Di, Do and Wt of ZrO2 nanotubes compared to TiO2 nanotube with nearly the same pore sizes as a visual illustration.


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

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

Illustration of pore size of the nanoporous and nanotubular layer.
© Copyright Policy
Related In: Results  -  Collection

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

jfb-06-00153-f006: Illustration of pore size of the nanoporous and nanotubular layer.
Mentions: The cubic ZrO2 nanotube was fabricated via anodization under the conditions of 1 M (NH4)2SO4 + 0.3 wt % NH4F (with the addition of H2SO4 to attain a pH = 5) at 30 V for 95 min, as indicated by the XRD patterns in Figure 5c. After annealing, the inner diameter of the nanotubes laid in the range of 20–36 nm, whilst the nanotube outer diameter (Do) was 48–68 nm and the wall thickness (Wt) was in the range of 9–11 nm. The roughness (Sa) and hydrophilic properties of ZrO2 nanotubes increased after annealing. Figure 6a shows the pore sizes of nanoporous Ta2O5 and Nb2O5, compared to TiO2 nanotube with nearly the same Di. Figure 6b,c,d shows the Di, Do and Wt of ZrO2 nanotubes compared to TiO2 nanotube with nearly the same pore sizes as a visual illustration.

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.