When a metal oxide is irradiated by gamma rays, the irradiated surface becomes hydrophilic. This surface phenomenon is called as radiation induced surface activation (RISA). In order to investigate radiation-induced and photo-induced hydrophilicity, the contact angles of water droplets on a titanium dioxide surface were measured in terms of irradiation intensity and time for gamma rays of cobalt-60 and for ultraviolet rays. Reciprocals of the contact angles increased in proportion to irradiation time before the contact angles reached their super-hydrophilicity state. The reciprocals of contact angles correlate well with integrated intensity by a straight line, regardless of the irradiation intensity and time. Radiation-induced and photo-induced hydrophilicity phenomena are identical to each other in this regard. In addition, an effect of ambient gas was investigated. In pure argon gas, the contact angle remains the same against the irradiation time. This clearly shows that a certain humidity in ambient gas is required to take the place of RISA hydrophilicity. A single crystal titanium dioxide (100) surface was analyzed by X-ray photoelectron spectrometry (XPS). After irradiation with gamma rays, a peak was found in the O 1s spectrum, indicating the adsorption of dissociative water to a surface 5-fold coordinate titanium site, and the formation of a surface hydroxyl group. We conclude that the RISA hydrophilicity is caused by chemisorption of the hydroxyl group on the surface.
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16th International Conference on Nuclear Engineering
May 11–15, 2008
Orlando, Florida, USA
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
0-7918-4816-7
PROCEEDINGS PAPER
Interfacial Phenomena of Radiation-Induced and Photo-Induced Available to Purchase
Yoshio Honjo,
Yoshio Honjo
Central Research Institute of Electric Power Industry, Tokyo, Japan
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Masahiro Furuya,
Masahiro Furuya
Central Research Institute of Electric Power Industry, Tokyo, Japan
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Tomoji Takamasa,
Tomoji Takamasa
Tokyo University of Marine Science and Technology, Tokyo, Japan
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Koji Okamoto
Koji Okamoto
University of Tokyo, Chiba, Japan
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Yoshio Honjo
Central Research Institute of Electric Power Industry, Tokyo, Japan
Masahiro Furuya
Central Research Institute of Electric Power Industry, Tokyo, Japan
Tomoji Takamasa
Tokyo University of Marine Science and Technology, Tokyo, Japan
Koji Okamoto
University of Tokyo, Chiba, Japan
Paper No:
ICONE16-48320, pp. 353-360; 8 pages
Published Online:
June 24, 2009
Citation
Honjo, Y, Furuya, M, Takamasa, T, & Okamoto, K. "Interfacial Phenomena of Radiation-Induced and Photo-Induced." Proceedings of the 16th International Conference on Nuclear Engineering. Volume 3: Thermal Hydraulics; Instrumentation and Controls. Orlando, Florida, USA. May 11–15, 2008. pp. 353-360. ASME. https://doi.org/10.1115/ICONE16-48320
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