Wettability and In Vitro Bioactivity of Doped TiO2 Nanotubes

doi:10.3724/SP.J.1077.2010.09749

Abstract

Abstract:

With low-modulus alloys of Ti35Nb and Ti35Nb15Zr as the anodization substrates, amorphous TiO₂ nanotube arrays doped by Nb and Zr elements were fabricated through a surface anodization method. The wettability and in vitro bioactivity of the doped TiO₂ nanotubes and undoped nanotubes were investigated. Experimental results indicated that the existence of Nb and Zr elements in the anodic oxides could refine the diameter of the nanotubes and help to grow longer nanotubes. All of the as-anodized nanotubes demonstrated a hydrophobic behavior, which was different from those of the metallic substrate surface. The wettability of the TiO₂-based nanotubes varied with the type of the substrate or dopant element. The doping with Nb element could improve the wetting behavior of the TiO₂nanotubes. And simultaneous doping with Nb and Zr elements could have more significant improvement in the wetting behavior. After immersion in simulated body fluids (SBF) the doped TiO₂ nanotubes could induce a quick apatite formation. The Nb/Zr doped nanotubes presented quicker apatite formation rate than the Ti-Nb-O nanotubes did at the initial immersion stage. The above findings make it possible to further control or modify the wettability toward either hydrophobic or hydrophilic surfaces, and explore related biological properties of the doped nanotubes.

Key words: anodization, nanotubes, wettability, bioactivity

CLC Number:

TQ153

HUANG Lin, NING Cong-Qin, DING Dong-Yan, BAI Shuo, QIN Rui, LI Ming, MAO Da-Li. Wettability and In Vitro Bioactivity of Doped TiO₂Nanotubes[J]. Journal of Inorganic Materials, 2010, 25(7): 775-779.

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Wettability and In Vitro Bioactivity of Doped TiO₂Nanotubes

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