Effect of Surface Morphology and Crystal Structure on Bioactivity of Titania Films Formed on Titanium Metal via Anodic Oxidation in Sulfuric Acid Solution

摘要

Porous titania layers composed of rutile and anatase were formed on the surface of titanium metals by anodic oxidation at voltages of 100, 150 and 180 V in H_2SO_4 solutions, with concentrations of 0.5, 1.0 and 2.0 M. Pore size increased with increasing applied voltage from 100 to 180 V under a constant H_2SO_4 concentration of 0.5, 1.0 or 2.0 M. The relative amount of rutile to anatase and the apatite-forming ability of titanium metals increased with increasing applied voltage from 100 to 180 V under a constant H_2SO_4 concentration of 0.5, 1.0 or 2.0 M and increasing H_2SO_4 concentration from 0.5 to 2.0 M under a constant applied voltage of 100, 150 or 180 V. Titanium metal anodically oxidized at 180 V in 2.0M-H_2SO_4 solutions showed extremely high apatite-forming ability in simulated body fluid (SBF).