| 1. Zirconium oxide nanotube arrays were prepared in inorganic electrolyte by anodization method. Results showed that the concentration of F-, applied potential, anodization time, and the kinds of electrolyte had obvious influence on fabricating oxide nanotube arrays. A serias experiments showed that highly self-organized zirconia nanotubes can be formed with a diameter 78nm and a length of 32μm in 1M (NH4)2SO4+0.5wt% NH4F at 20V for 3h. XRD investigations showed that as-formed oxide nanotubes were of an orthorhombic structure.2. Zirconium oxide nanotube arrays were prepared in organic electrolyte by anodization method. Results showed that the concentration of F-, applied potential, anodization time, and the viscidityof electrolyte had obvious influence on fabricating oxide nanotube arrays. A serias experiments showed that highly aspect ratio zirconia nanotubes can be formed with a diameter 192nm and a length of 300μm in in FA+glycerol+1.0wt% NH4F solution at 50V for 24h. XRD investigations showed that as-formed oxide nanotubes were of an amorphous nature.3. Zirconium alloy oxide nanotube arrays were prepared in organic electrolyte by anodization method. Results showed that the anodization time, potential applied, the concentration of F- and the kinds of electrolyzer had obvious influence on fabricating oxide nanotube arrays. XRD patterns showed that as-formed oxide layers were of amorphous structure, the alloy oxide structures appeared after annealing in air at 400 oC and 600 oC for 3h.4. Combined with a large number of experiments, we discuss the formation mechanism of the zirconia nanotube arrays. A simple formation model has also been presented. We tested the optical property and biocompatibility with Ca10(PO4)6(OH)2(HAP). The results indicated that the annealed temperature have important influence on the zirconia nanotubes crystallization. When the excitation wavelength was 412nm, two emission peaks appeared, the emission was centered at ca.442 nm and ca.465 nm. The HAP materials have successfully grown on the zirconia surface; these materials have a significant effect on the replacement of bone joint. |
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