Photocatalytic activity of low temperature oxidized Ti–6Al–4V
Numerous advanced surface modification techniques exist to improve bone integration and antibacterial properties of titanium based implants and prostheses. A simple and straightforward method of obtaining uniform and controlled TiO2 coatings of devices with complex shapes is H2O2-oxidation and hot water aging. Based on the photoactivated bactericidal properties of TiO2, this study was aimed at optimizing the treatment to achieve high photocatalytic activity. Ti–6Al–4V samples were H2O2-oxidized and hot water aged for up to 24 and 72 h, respectively. Degradation measurements of rhodamine B during UV-A illumination of samples showed a near linear relationship between photocatalytic activity and total treatment time, and a nanoporous coating was observed by scanning electron microscopy. Grazing incidence X-ray diffraction showed a gradual decrease in crystallinity of the surface layer, suggesting that the increase in surface area rather than anatase formation was responsible for the increase in photocatalytic activity.
This project is part of the ProViking program, funded by the Swedish Foundation for Strategic Research (SSF). EBM rods of Ti–6Al–4V were kindly provided by Arcam AB.
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