ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Superhydrophobic ZnO films were prepared by a simple low-temperature solution method,where the ZnO morphology was tuned by hydrofluoric acid. The film topography presents two differentlength scales: micro flower-like-spheres and nano petals. Such hierarchical structures give the film asuperhydrophobic behavior with water contact angle (CA) of 151°, turning into a superhydrophilic one(CA 〈 5°) after 30 min vacuum ultraviolet (VUV) illumination. The transition from superhydrophobicityto superhydrophilicity is more quickly than the past report using UV illumination because VUV giveshigher energy upon the ZnO films. The VUV-illuminated film can be recovered to superhydrophobicthrough being placed in the dark. Such special wettability can be explained based on ZnO as aphotoinduced semiconductor and a photocatalyst. This study will greatly extend applications of ZnOnanomaterials to many important fields, such as microfluidic devices
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1374.pdf
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