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Characterization on titanium surfaces and its effect on photocatalytic bactericidal activity

Cited 16 time in Web of Science Cited 20 time in Scopus
Authors
Joo, Hyeon-Cheol; Lim, Young-Jun; Kim, Myung-Joo; Kwon, Ho-Beom; Han, Jun-Hyun
Issue Date
2010
Publisher
Elsevier
Citation
Applied Surface Science, Vol.257, No.3, pp.741-746
Keywords
AnataseUV illuminationTitanium dioxideBactericidal effectPhotocatalyst
Abstract
Many studies have been published on the use of TiO2 as a photocatalyst, which decomposes various organic compounds under UV illumination by generating various radicals. The purpose of the present study was to evaluate the photocatalytic bactericidal effects of variously treated titanium surfaces on Escherichia coli K-12. The specimens were fabricated from grade 4 commercially pure titanium, 12 mm in diameter and 1 mm in thickness. Five different surfaces were prepared (MA: machined surface; AO: anodized at 300 V; NO: NaOH-treated; NW: NaOH- and water-treated; and HT: heat-treated). Surface analysis was performed using scanning electron microscopy, optical interferometer, and thin-film X-ray diffractometry. Photocatalytic activity of each group was confirmed by degradation of methylene blue (MB). The antibacterial activity was assessed by calculating the survival ratio in a drop of a culture of E. coli placed on the surface under UV illumination. Significant photocatalytic activity and bactericidal effects were observed on the titanium surfaces of AO and NW, regardless of the surface roughness (P < 0.01). The group with anatase was the most susceptible to the photocatalytic effect, while the surface without anatase showed the least susceptibility. Based on this in vitro study, the crystallography of the oxide layer on its titanium surfaces is an important factor affecting the photocatalytic bactericidal activity. (C) 2010 Elsevier B.V. All rights reserved.
ISSN
0169-4332
Language
English
URI
http://hdl.handle.net/10371/81055
DOI
https://doi.org/10.1016/j.apsusc.2010.07.054
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College of Dentistry/School of Dentistry (치과대학/치의학대학원)Dept. of Dentistry (치의학과)Journal Papers (저널논문_치의학과)
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