Her, Eun Kyu Ko, Tae-Jun Lee, Kwang-Ryeol Oh, Kyu Hwan Moon, Myoung-Woon 2024-01-20T14:03:41Z 2024-01-20T14:03:41Z 2021-09-04 2012-09 2040-3364 https://pubs.kist.re.kr/handle/201004/128951 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. English ROYAL SOC CHEMISTRY SUPERHYDROPHOBIC SURFACES DESERT BEETLE LOTUS WATER Bioinspired steel surfaces with extreme wettability contrast Article 10.1039/c2nr11934j 1 NANOSCALE, v.4, no.9, pp.2900 - 2905 NANOSCALE 4 9 2900 2905 scie scopus 000302807600018 2-s2.0-84859860214 Chemistry, Multidisciplinary Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Chemistry Science & Technology - Other Topics Materials Science Physics Article SUPERHYDROPHOBIC SURFACES DESERT BEETLE LOTUS WATER nanopattern steel CF4 water immersion test superhydrophobic biomimetic