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Anodic oxidation is an electrochemical method to deposit ceramic coatings on the metals substrate. It has been widely used to modify the surface properties of titanium in order to improve the bioactivity. Recently, photocatalytic activity of biomaterials has attracted great deal of attention. This study aims to investigate the effect of UV irradiation on the precipitation of bone-like apatite in simulated body fluid (SBF). Specifically, the high purity titanium foils were anodised at various voltage (50V-350V) in mixture of βglycerophosphate disodium salt pentahydrate (β-GP) and calcium acetate monohydrate (CA) for 10 minutes. Next, the anodised titanium foils were soaking in SBF for 7 days by illuminating with UVC light (peak wavelength of 254 nm). Field emission scanning electron microscopy (FESEM) and glancing angle X-ray diffractometer (GAXRD) were used to characterise the surface morphology and crystallinity of anodised titanium before and after soaking in SBF. After 7 days, bone-like apatite was covered on the surface of anodised titanium. Interestedly, smooth surface of anodised titanium also covered by bone-like apatite which contradict with the previous findings that concluded smooth surface lack of nucleation site for the growth of bone-like apatite. This finding indicated that •OH groups produced during photocatalysis were the key factor to induce the precipitation of bone-like apatite. The result also showed that novel bioactive material is able to prepare by photocatalysis of anodised titanium in SBF. Keywords— anodic oxidation, titanium, titanium dioxide, UV irradiation, simulated body fluid, bone-like apatite.

UV induced Precipitation of Bone like Apatite on Anodised Titanium in Simulated Body Fluid