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Mechanically Robust Superamphiphobic Aluminum Surface with Nanopore-Embedded Microtexture
Barthwal, Sumit,Kim, Young Su,Lim, Si-Hyung American Chemical Society 2013 Langmuir Vol.29 No.38
<P>A simple fabrication technique was developed for preparing a mechanically robust superamphiphobic surface on an aluminum (Al) plate. Dual geometric architectures with micro- and nanoscale structures were formed on the surface of the Al plate by a combination of simple chemical etching and anodization. This proposed methodology involves (1) fabrication of irregular microscale plateaus on the surface of the Al plate, (2) formation of nanopores, and (3) fluorination. Wettability measurements indicated that the fabricated Al surface became super-repellent toward a broad range of liquids with surface tension in the range 27.5–72 mN/m. By varying the anodization time, we measured and compared the effects of morphological change on the wettability. The adhesion property and mechanical durability of the fabricated superamphiphobic Al surface were evaluated by the Scotch tape and hardness tests, respectively. The results showed that the fabricated Al surface retained mechanical robustness because the down-directed surface made by nanopores on the microtextured surface was durable enough even after high force was applied. Almost no damage of the film was observed, and the surface still exhibited superamphiphobicity after the tests. The fabricated superamphiphobic surface also remained stable after long-term storage. The simple and time-saving fabrication technique can be extended to any large-area three-dimensional surface, making it potentially suitable for large-scale industrial fabrications of mechanically robust superamphiphobic surfaces.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/langd5/2013/langd5.2013.29.issue-38/la402600h/production/images/medium/la-2013-02600h_0017.gif'></P>
Barthwal, Sumit,Kim, Young Su,Lim, Si-Hyung 한국정밀공학회 2012 International Journal of Precision Engineering and Vol.13 No.8
We have demonstrated a facile fabrication of copper oxide hierarchical structures on copper substrates by the oxidation of copper in hot alkaline solutions. The flowerlike hierarchical structures are synthesized by simply immersing a copper substrate into ammonium hydroxide alkaline solutions and heating at a particular temperature. The wettability of the surface was changed by chemical modification with 1H,1H,2H,2H-perfluorooctyltrichloro silane. We also discuss the effect of heating time on the morphology of the as-prepared copper oxide and hydrophobicity/oleophobicity. It is a unique method to generate both superhydrophobic and superoleophobic conditions in the same copper plate. The developed fabrication procedures allow the large area, cost-effective fabrication of copper oxide films. Our method might provide a general route towards the preparation of novel hierarchical films on metal substrates for various industrial applications including fluid transfer, fluid power systems, stain resistant, and antifouling.
Sumit Barthwal,임시형,김영수 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
We have demonstrated a facile fabrication of copper oxide hierarchical structures on copper substrates by the oxidation of copper in hot alkaline solutions. The flowerlike hierarchical structures are synthesized by simply immersing a copper substrate into ammonium hydroxide alkaline solutions and heating at a particular temperature. The wettability of the surface was changed by chemical modification with 1H,1H,2H,2H-perfluorooctyltrichloro silane. We also discuss the effect of heating time on the morphology of the as-prepared copper oxide and hydrophobicity/oleophobicity. It is a unique method to generate both superhydrophobic and superoleophobic conditions in the same copper plate. The developed fabrication procedures allow the large area, cost-effective fabrication of copper oxide films. Our method might provide a general route towards the preparation of novel hierarchical films on metal substrates for various industrial applications including fluid transfer, fluid power systems, stain resistant, and antifouling.
Sumit Barthwal,임시형 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.7 No.2
We report a simple method for fabricating micro-nanoscale structures consisting of irregular microscale plateaus with a self-assembled network of zinc oxide nanopetals on an aluminum alloy substrate. The method involves a combination of chemical etching with a hydrothermal process, followed by Polydimethylsiloxane coating via a simple vapor deposition method. Following the coating, surface displays superhydrophobicity with water contact angle of 161° and a sliding angle of 4°. The effect of morphological changes on wettability is examined by varying the hydrothermal processing time. The chemical stability of the superhydrophobic surfaces is examined in a wide range of corrosive media. After being immersed in a 3.5 wt% NaCl solution for 1 month, the surface retained its superhydrophobicity. The potentiodynamic polarization test results reveal that the superhydrophobic surface highly improves the corrosion resistance performance of the bare aluminum surface by three orders of magnitude. In addition, surface exhibited good mechanical durability against sandpaper abrasion, and long-term stability in the ambient environment. The proposed fabrication technique operating at relatively low temperature is simple and provides a new approach for production of large-scale three-dimensional superhydrophobic surfaces for various applications.