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Photogeneration of Highly Amphiphilic TiO 2 Surfaces
Author(s) -
Wang Rong,
Hashimoto Kazuhito,
Fujishima Akira,
Chikuni Makoto,
Kojima Eiichi,
Kitamura Atsushi,
Shimohigoshi Mitsuhide,
Watanabe Toshiya
Publication year - 1998
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/(sici)1521-4095(199801)10:2<135::aid-adma135>3.0.co;2-m
Subject(s) - wetting , materials science , amphiphile , contact angle , adsorption , fourier transform infrared spectroscopy , x ray photoelectron spectroscopy , chemical engineering , infrared , nanotechnology , photochemistry , polymer , optics , composite material , organic chemistry , chemistry , copolymer , engineering , physics
The photoconvertible surface wettability of TiO 2 materials —UV illumination of these materials can generate surfaces that display a 0° contact angle for both water and oily liquids—is investigated. Frictional force, X‐ray photoelectron, and Fourier transform infrared spectroscopies are used to supply information at a microscopic level. It is concluded that UV illumination is able to convert initially hydrophobic TiO 2 surfaces into highly amphiphilic ones. This behavior is ascribed to photogenerated Ti 3+ defect sites that favor dissociative water adsorption.