J0401-2-2 化学・水熱複合処理によるTi表面への生体活性・不活性膜の合成(生体材料およびその表面改質材(2))

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The combined chemical-hydrothermal synthesis of bioactive/ bioinert films on pure Ti substrates was examined with a focus on crystallinity and surface morphology. Pure Ti disks were chemically treated with H_2O_2/HNO_3 aqueous solutions in order to form a TiO_2 gel layer on the surfaces. The samples were then hydrothermally treated in an autoclave at 453 K for 12 h. Anatase-type TiO_2, perovskite-type CaTiO_3 and ZrO_2-TiO_2 films with high crystallinity were obtained upon treatments with distilled water, aqueous Ca(OH)_2 and Zr(OH)_4 dispersed NH_3/CH_3CH(OH)COOH aqueous solution, respectively. In addition, the samples were immersed in SBF (Simulated Body Fluid), adjusted to 310 K. A light hydroxyapatite (HAp) precipitate was observed on the unmodified Ti surface after 6 days of immersion. Precipitation of HAp was observed only after 2 days on TiO_2 and CaTiO_3 films. In contrast, it was delayed on ZrO_2-TiO_2 film up to 8 days.
2009-09-12