J Mater Sci Technol ›› 2004, Vol. 20 ›› Issue (05): 550-554.

• Research Articles • Previous Articles     Next Articles

Characterization of Sol-gel-derived TiO2 and TiO2-SiO2 Films for Biomedical Applications

Jingxiao LIU, Fei SHI, Dazhi YANG   

  1. Department of Materials Science and Engineering, Dalian Institute of Light Industry, Dalian 116034, China...
  • Received:1900-01-01 Revised:1900-01-01 Online:2004-09-28 Published:2009-10-10
  • Contact: Jingxiao LIU

Abstract: In order to improve the corrosion resistance and biocompatibility of NiTi surgical alloy, TiO2 and TiO2-SiO2 thin films were prepared by sol-gel method. The surface characteristics of the film, which include surface composition, microstructure and surface morphology, were studied by X-ray diffraction (XRD), atomic force microscopy (AFM) and X-ray photoelectron spectra (XPS), respectively. A scratching test was used to assess the interface adhesive strength between the film and substrate. The corrosion resistances of NiTi alloy coated with oxide films were studied by anodic polarization curves measurement in biological solution. Additionally, a preliminary study of the in vitro bioactivity of the films was conducted. The results indicated that TiO2 and TiO2-SiO2 (Ti/Si=4:1) films have higher electrochemical corrosion resistance and can be used as protective layers on NiTi alloy. In addition, TiO2-SiO2 composite films have better bioactivity than TiO2 film.

Key words: TiO2, TiO2-SiO2, Films, Sol-gel process, Biocompatibility