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Ultraviolet-Enhanced Wettability and Bioactivity of Self-Organized TiO2 Nanotube Layer

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Abstract:

TiO2 nanotube layers were prepared by anodic oxidation of commercial pure Ti in aqueous solutions containing 1 M (NH4)2SO4 and 0.15 M NH4F at 20 V for 2 h. The as-anodized layers were annealed at 450 °C for 3 h, and a part of the annealed layers were subsequently irradiated by Ultraviolet (UV) light in air for 2 h at room temperature. Hydrophilicity and the apatite-forming ability of TiO2 nanotube layers were evaluated. The results show that the as-anodized layer consists of self-organized TiO2 nanotubes with amorphous structure, which transforms to anatase after annealing at 450 °C for 3 h. The annealing treatment of the nanotube layer can significantly enhance its hydrophilicity and bioactivity. Furthermore, UV irradiation of the annealed TiO2 nanotube layer does not alter its surface morphology and phase component, however, can improve hydrophilicity and bioactivity. The enhanced hydrophilicity and bioactivity are thought to result from the abundant basic Ti–OH groups on the UV-irradiated TiO2 nanotube layer.

Keywords: BIOACTIVITY; NANOTUBE; TiO2; UV IRRADIATION

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2011.3941

Publication date: December 1, 2011

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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