title: Photocatalytic activity of low temperature oxidized Ti-6Al-4V.
abstract: 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 TiO(2) coatings of devices with complex shapes is H(2)O(2)-oxidation and hot water aging. Based on the photoactivated bactericidal properties of TiO(2), this study was aimed at optimizing the treatment to achieve high photocatalytic activity. Ti-6Al-4V samples were H(2)O(2)-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.
authors.affiliation: Division of Applied Materials Science, Department of Engineering Sciences, The Ångström Laboratory, Uppsala University, Box 534, 751 21 Uppsala, Sweden. erik.unosson@angstrom.uu.se
authors.forename: Erik
authors.initials: E
authors.lastname: Unosson
authors.forename: Cecilia
authors.initials: C
authors.lastname: Persson
authors.forename: Ken
authors.initials: K
authors.lastname: Welch
authors.forename: Håkan
authors.initials: H
authors.lastname: Engqvist
mesh_terms: D000497:Alloys; D000900:Anti-Bacterial Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D002384:Catalysis / Q000187:drug effects / Q000528:radiation effects; D020099:Coated Materials, Biocompatible / Q000737:chemistry / Q000494:pharmacology; D003080:Cold Temperature; D003460:Crystallization; D006861:Hydrogen Peroxide / Q000494:pharmacology; D008422:Materials Testing; D010084:Oxidation-Reduction / Q000187:drug effects; D010777:Photochemistry / Q000379:methods; D016062:Porosity; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects; D014961:X-Ray Diffraction
chemical_list: D000497:Alloys; D000900:Anti-Bacterial Agents; D020099:Coated Materials, Biocompatible; C031462:titanium alloy (TiAl6V4); D006861:Hydrogen Peroxide; D014025:Titanium