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Cited by 664

The DOI matches its Crossref record; 36 of the 36 references it cites were found in a registry or an index.

Studies of Surface Wettability Conversion on TiO2 Single-Crystal Surfaces

Wang, Rong, Sakai, Nobuyuki, Fujishima, Akira, Watanabe, Toshiya, Hashimoto, Kazuhito·1999·The Journal of Physical Chemistry B

Abstract

Reversible surface wettability conversion on titanium dioxide (TiO 2 ) single crystals has been achieved, and its mechanism has been examined by means of contact angle measurement and X-ray photoelectron spectroscopy (XPS). A UV light illuminated TiO 2 single-crystal surface exhibited a 0° contact angle for both water and oil, indicative of a highly amphiphilic surface against its native hydrophobic surface. This was ascribed to photoreduction of surface Ti 4+ to Ti 3+ at definite sites, leading to preferential adsorption of dissociative water on top. A long-term storage of the highly amphiphilic surface resulted in reconversion of the surface wettability. It was found that the amphiphilic-to-hydrophobic reconversion is due to the replacement of the adsorbed hydroxyl groups by oxygen, which returns the surface geometric and electronic structures similar to the native TiO 2 surface. The result of angle-resolved XPS measurement revealed that the surface reactions occurred at the uppermost layers of the single crystals. By comparing the reactivities of (110), (100), and (001) single-crystal surfaces, it was concluded that oxygen bridging sites played an important role in the surface wettability conversions.

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Metadata

Authors
Wang, R., Sakai, N., Fujishima, A., Watanabe, T., & Hashimoto, K.
Venue
The Journal of Physical Chemistry B
Published
1999-03-01
Volume
103
Issue
12
Pages
2188-2194
ISSN
  • 1520-5207 (ISSN-L)
  • 1520-6106
OpenAlex
W2031409217
Cited by
664
References
36
FWCI
18.79
Type
journal article
Language
en
Open access
closed

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