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A highly transparent self-cleaning superhydrophobic surface by organosilane-coated alumina particles deposited via electrospraying

Authors
Yoon, HyunKim, HayongLatthe, Sanjay S.Kim, Min-wooAl-Deyab, SalemYoon, Sam S.
Issue Date
2015
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.3, no.21, pp.11403 - 11410
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF MATERIALS CHEMISTRY A
Volume
3
Number
21
Start Page
11403
End Page
11410
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/96422
DOI
10.1039/c5ta02226f
ISSN
2050-7488
Abstract
A highly transparent self-cleaning superhydrophobic surface was prepared by electrospraying an organosilane-coated alumina precursor. By simply controlling the spraying time, a coating with excellent superhydrophobicity as well as transparency in the visible range was achieved. Increased spraying time increased the water contact-angle, while reducing the transparency of the coatings. Organosilane-coated alumina particles prepared with a spraying time of 300 s showed similar to 90% transmittance at a wavelength of 550 nm. A water drop acquired a perfect spherical shape with a contact angle of 162 degrees and eventually rolled off a coated surface at an extremely low sliding angle <3 degrees. This robust superhydrophobicity retained its intrinsic wettability even after 30 min of continuous water jet impact. Dust particles accumulated on the coating surface were washed off completely by rolling a few water drops, leaving behind a perfectly clean surface. Such self-cleaning and transparent superhydrophobic coatings have potential applications in the optical industry.
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공과대학 (기계공학부)
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