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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.


Photo images of water droplet on the surface of nanoporous and nanotubular layers.
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jfb-06-00153-f004: Photo images of water droplet on the surface of nanoporous and nanotubular layers.

Mentions: Figure 3b shows the change of hydrophilic properties of bare tantalum and titanium after fabrication of the nanoporous and nanotubular layers on their surfaces. The water contact angle measurement of a surface represents the wetting properties of the surface. The literature defines a surface as superhydrophobic when the water contact angle (θw) is more than 150° and hydrophobic when it is 90° < θw < 150°. A surface has superhydrophilic properties when θw < 10° and has hydrophilic properties with a water contact angle 10° < θw < 90° [47]. The as-formed nanoporous Ta2O5 exhibited hydrophilic properties that were similar to the TiO2 nanotubes with the same distribution of inner diameters, Di (under the conditions of = 0.5 wt %, 20 V). Figure 4 presents photo images of a water droplet on the surface of nanoporous and nanotubular layers. Figure 3a,b also suggests a direct relationship between roughness and water contact angle. When the roughness increased there was a decrease in the water contact angle. The calculated surface energy for nanoporous Ta2O5 increased after anodization and also after annealing due to the completion of its crystallization. The water contact angle and surface energy have been detailed in Table 2 for nanoporous Ta2O5.


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

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

Photo images of water droplet on the surface of nanoporous and nanotubular layers.
© Copyright Policy
Related In: Results  -  Collection

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

jfb-06-00153-f004: Photo images of water droplet on the surface of nanoporous and nanotubular layers.
Mentions: Figure 3b shows the change of hydrophilic properties of bare tantalum and titanium after fabrication of the nanoporous and nanotubular layers on their surfaces. The water contact angle measurement of a surface represents the wetting properties of the surface. The literature defines a surface as superhydrophobic when the water contact angle (θw) is more than 150° and hydrophobic when it is 90° < θw < 150°. A surface has superhydrophilic properties when θw < 10° and has hydrophilic properties with a water contact angle 10° < θw < 90° [47]. The as-formed nanoporous Ta2O5 exhibited hydrophilic properties that were similar to the TiO2 nanotubes with the same distribution of inner diameters, Di (under the conditions of = 0.5 wt %, 20 V). Figure 4 presents photo images of a water droplet on the surface of nanoporous and nanotubular layers. Figure 3a,b also suggests a direct relationship between roughness and water contact angle. When the roughness increased there was a decrease in the water contact angle. The calculated surface energy for nanoporous Ta2O5 increased after anodization and also after annealing due to the completion of its crystallization. The water contact angle and surface energy have been detailed in Table 2 for nanoporous Ta2O5.

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.