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Title: Light-induced bioactive TiO{sub 2} surface

Abstract

We have achieved bioactivity enhancement of nanostructured titania using ultraviolet (uv) light irradiation. The titania coating fabricated by nanoparticle plasma spraying consists of a nano-TiO{sub 2} coating surface composed of primarily nanosized anatase. After irradiation by ultraviolet light in air for 24 h, the as-sprayed and UV-irradiated TiO{sub 2} coatings were soaked in simulated body fluids (SBF) to investigate their bioactivity. The UV-illuminated TiO{sub 2} coating induced bonelike apatite formation on the surface whereas no apatite could be detected on the as-sprayed TiO{sub 2} coating. The formation of oxygen vacancies at the two-coordinated bridging sites by UV illumination is believed to result in the conversion of the corresponding Ti{sup 4+} sites to Ti{sup 3+} sites, which are favorable to the dissociation of water in the SBF and subsequent formation of Ti-OH and an apatite layer. Our results reveal that the surface bioactivity of titania coatings can be induced by UV illumination.

Authors:
; ; ;  [1];  [2];  [2]
  1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050 (China) and Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong (China)
  2. (China)
Publication Date:
OSTI Identifier:
20778531
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 88; Journal Issue: 1; Other Information: DOI: 10.1063/1.2162687; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AIR; APATITES; BODY FLUIDS; CRYSTALS; DISSOCIATION; IRRADIATION; LAYERS; NANOSTRUCTURES; OXYGEN; PLASMA; SPRAYED COATINGS; SURFACE TREATMENTS; TITANIUM IONS; TITANIUM OXIDES; ULTRAVIOLET RADIATION; VACANCIES; VISIBLE RADIATION

Citation Formats

Liu Xuanyong, Zhao Xiaobing, Ding Chuanxian, Chu, Paul K., Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, and Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong. Light-induced bioactive TiO{sub 2} surface. United States: N. p., 2006. Web. doi:10.1063/1.2162687.
Liu Xuanyong, Zhao Xiaobing, Ding Chuanxian, Chu, Paul K., Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, & Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong. Light-induced bioactive TiO{sub 2} surface. United States. doi:10.1063/1.2162687.
Liu Xuanyong, Zhao Xiaobing, Ding Chuanxian, Chu, Paul K., Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, and Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong. Mon . "Light-induced bioactive TiO{sub 2} surface". United States. doi:10.1063/1.2162687.
@article{osti_20778531,
title = {Light-induced bioactive TiO{sub 2} surface},
author = {Liu Xuanyong and Zhao Xiaobing and Ding Chuanxian and Chu, Paul K. and Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050 and Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong},
abstractNote = {We have achieved bioactivity enhancement of nanostructured titania using ultraviolet (uv) light irradiation. The titania coating fabricated by nanoparticle plasma spraying consists of a nano-TiO{sub 2} coating surface composed of primarily nanosized anatase. After irradiation by ultraviolet light in air for 24 h, the as-sprayed and UV-irradiated TiO{sub 2} coatings were soaked in simulated body fluids (SBF) to investigate their bioactivity. The UV-illuminated TiO{sub 2} coating induced bonelike apatite formation on the surface whereas no apatite could be detected on the as-sprayed TiO{sub 2} coating. The formation of oxygen vacancies at the two-coordinated bridging sites by UV illumination is believed to result in the conversion of the corresponding Ti{sup 4+} sites to Ti{sup 3+} sites, which are favorable to the dissociation of water in the SBF and subsequent formation of Ti-OH and an apatite layer. Our results reveal that the surface bioactivity of titania coatings can be induced by UV illumination.},
doi = {10.1063/1.2162687},
journal = {Applied Physics Letters},
number = 1,
volume = 88,
place = {United States},
year = {Mon Jan 02 00:00:00 EST 2006},
month = {Mon Jan 02 00:00:00 EST 2006}
}