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Superhydrophobic nanostructures based on porous alumina

Title
Superhydrophobic nanostructures based on porous alumina
Authors
Kim, DHwang, WPark, HCLee, KH황운봉
Date Issued
Oct-2008
Publisher
ELSEVIER SCIENCE BV
Abstract
Superhydrophobic polytetrafluoroethylene (Teflon (R), DuPont.) sub-micro and nanostructures were fabricated by the dipping method, based on anodization process in oxalic acid. The polymer sticking phenomenon during the replication creates the sub-microstructures on the negative polytetrafluoroethylene nanostructure replica. This process gives a hierarchical structure with nanostructures on sub-microstructures, which looks like the same structures as lotus leaf and enables commercialization. The diameter and the height of the replicated nano pillars were 40 nm and 40 pm respectively. The aspect ratio is approximately 1000. The fabricated surface has a semi-permanent superhydrophobicity, the apparent contact angle of the polytetrafluoroethylene sub-micro and nanostructures is about 160 degrees, and the sliding angle is less than 1 degrees. (C) 2007 Elsevier B.V. All rights reserved.
Keywords
lotus leaf; superhydrophobic; wettability; anodic alumina oxide; polymer sticking; micro/nanostructures; SURFACES; LOTUS
URI
http://oasis.postech.ac.kr/handle/2014.oak/22556
DOI
10.1016/J.CAP.2007.0
ISSN
1567-1739
Article Type
PROCEEDINGS PAPER
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