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Preparation and bioactivity of embedded-style hydroxyapatite-titania nanotube arrays

Xiao X. F., Liu R. F., Tian T.

Materials Science Poland

2009

Vol. 27, No. 1

23--31

Embedded-style hydroxyapatite-titania nanotube arrays were successfully prepared by anodic oxidation of titanium substrate and centrifugal filling hydroxyapatite precursor sol into hollow nanotubes. The morphology, microstructure and thermal stability of the samples were characterized by X-ray diffraction, environmental scanning electron microscopy, and energy dispersive X-ray analysis. The results show that the structure of titania nanotube arrays is stable at 500 °C or below, and the crystallized hydroxyapatite could be formed from hydroxyapatite precursor sol after calcining at 500 °C for 4 h. The optimum calcining temperature for this material is 500 °C. An obvious apatite layer formed on the surface of the embedded- style material after soaking in simulated body fluid for 5 days, indicating that the material possesses a good in vitro apatite forming ability on its surface.

Biomimetic growth of apatite on titania nanotube arrays fabricated by titanium anodization in NH4F/H2SO4 electrolyte

Tian T., Xiao Xiu-feng, She Hou-de, Liu Rong-fang

Materials Science Poland

2008

Vol. 26, No. 3

487--494

In the present work, the titania nanotube arrays was fabricated by anodizing titanium in NH4F/H2SO4 electrolyte. The crystal structure and the apatite-forming ability of the titania nanotube arrays were investigated. The samples were examined by ESEM, XRD and FT-IR. The results indicate that the crystal structure of the titania nanotube arrays occurred transformation from amorphous to anatase and rutile as the annealed temperature rised. The surface structure of the nanotube could enhance the bioactivity of titania. The bioactivity of titania nanotube arrays lies on its the crystal structure, ranked in following series: mixture of anatase and rutile structure > anatase > amorphous.