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Issue 9, 2012
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Bioinspired steel surfaces with extreme wettability contrast

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Abstract

The exterior structures of natural organisms have continuously evolved by controlling wettability, such as the Namib Desert beetle, whose back has hydrophilic/hydrophobic contrast for water harvesting by mist condensation in dry desert environments, and some plant leaves that have hierarchical micro/nanostructures to collect or repel liquid water. In this work, we have provided a method for wettability contrast on alloy steels by both nano-flake or needle patterns and tuning of the surface energy. Steels were provided with hierarchical micro/nanostructures of Fe oxides by fluorination and by a subsequent catalytic reaction of fluorine ions on the steel surfaces in water. A hydrophobic material was deposited on the structured surfaces, rendering superhydrophobicity. Plasma oxidization induces the formation of superhydrophilic surfaces on selective regions surrounded by superhydrophobic surfaces. We show that wettability contrast surfaces align liquid water within patterned hydrophilic regions during the condensation process. Furthermore, this method could have a greater potential to align other liquids or living cells.

Graphical abstract: Bioinspired steel surfaces with extreme wettability contrast

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Publication details

The article was received on 07 Dec 2011, accepted on 28 Feb 2012 and first published on 05 Mar 2012


Article type: Paper
DOI: 10.1039/C2NR11934J
Citation: Nanoscale, 2012,4, 2900-2905
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    Bioinspired steel surfaces with extreme wettability contrast

    E. K. Her, T. Ko, K. Lee, K. H. Oh and M. Moon, Nanoscale, 2012, 4, 2900
    DOI: 10.1039/C2NR11934J

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