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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.


Demonstration of (a,c,e) changes of roughness (Sa) and (b,d,f) modification of water contact angle of bare tantalum, niobium, zirconium and titanium after fabrication of nanotubular and nanoporous layer. Each data point is an average of three measurements.
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jfb-06-00153-f003: Demonstration of (a,c,e) changes of roughness (Sa) and (b,d,f) modification of water contact angle of bare tantalum, niobium, zirconium and titanium after fabrication of nanotubular and nanoporous layer. Each data point is an average of three measurements.

Mentions: Figure 3a demonstrates the influence of the formation of nanoporous Ta2O5 and the TiO2 nanotubes on the Sa with respect to the bare metals. The nanoporous layer of Ta2O5 revealed a lower surface roughness than the TiO2 nanotubes, with almost the same distribution of inner diameter (Di), when the concentration of fluoride ion was 0.5 wt % at 20 V. The roughness similarity arose because the TiO2 nanotubes were separated from each other, whereas the nanoporous Ta2O5 formed a continuous layer. The surface area index (SI) may be calculated by dividing the projected surface area, namely, the total exposed three-dimensional surface area being analyzed, including peaks and valleys, to the surface area measured in the lateral direction. The volume index (VI) may be calculated by dividing the natural volume, namely, the amount of liquid that it would take to submerge the dataset to its highest point, to the normal volume that is measured in the lateral of the nanoporous layer. The SI and VI values of nanoporous Ta2O5 are shown in Table 1, with the corresponding roughness amplitude parameters, and verify that the Ta2O5 nanoporous layer did not significantly change the surface area and roughness of the bare metal. Although the distribution of nanoporous Ta2O5 was not uniform, there were no high peaks and low valleys according to the measured Sskw, which is close to zero. The peaks and valleys exhibited a platykurtic distribution that was almost uniform due to the Sku being near to 3.


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

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

Demonstration of (a,c,e) changes of roughness (Sa) and (b,d,f) modification of water contact angle of bare tantalum, niobium, zirconium and titanium after fabrication of nanotubular and nanoporous layer. Each data point is an average of three measurements.
© Copyright Policy
Related In: Results  -  Collection

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

jfb-06-00153-f003: Demonstration of (a,c,e) changes of roughness (Sa) and (b,d,f) modification of water contact angle of bare tantalum, niobium, zirconium and titanium after fabrication of nanotubular and nanoporous layer. Each data point is an average of three measurements.
Mentions: Figure 3a demonstrates the influence of the formation of nanoporous Ta2O5 and the TiO2 nanotubes on the Sa with respect to the bare metals. The nanoporous layer of Ta2O5 revealed a lower surface roughness than the TiO2 nanotubes, with almost the same distribution of inner diameter (Di), when the concentration of fluoride ion was 0.5 wt % at 20 V. The roughness similarity arose because the TiO2 nanotubes were separated from each other, whereas the nanoporous Ta2O5 formed a continuous layer. The surface area index (SI) may be calculated by dividing the projected surface area, namely, the total exposed three-dimensional surface area being analyzed, including peaks and valleys, to the surface area measured in the lateral direction. The volume index (VI) may be calculated by dividing the natural volume, namely, the amount of liquid that it would take to submerge the dataset to its highest point, to the normal volume that is measured in the lateral of the nanoporous layer. The SI and VI values of nanoporous Ta2O5 are shown in Table 1, with the corresponding roughness amplitude parameters, and verify that the Ta2O5 nanoporous layer did not significantly change the surface area and roughness of the bare metal. Although the distribution of nanoporous Ta2O5 was not uniform, there were no high peaks and low valleys according to the measured Sskw, which is close to zero. The peaks and valleys exhibited a platykurtic distribution that was almost uniform due to the Sku being near to 3.

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.