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2015 ; 6
(2
): 153-70
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gab.com Text
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Fabrication and Characterization of Nanoporous Niobia, and Nanotubular Tantala,
Titania and Zirconia via Anodization
#MMPMID25837724
Minagar S
; Berndt CC
; Wen C
J Funct Biomater
2015[Mar]; 6
(2
): 153-70
PMID25837724
show ga
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.
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