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Micro and Nano-Texturization of Intermetallic Oxide Alloys by a Single Anodization Step: Preparation of Artificial Self-Cleaning Surfaces

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Laboratório de Filmes Finos e Fabricação de Nanoestruturas (L3Fnano), UFRGS, Instituto de Física, Av. Bento Gonçalves 9500, P.O. Box 15051, 91501-970, Porto Alegre, RS, Brazil
Laser Spectroscopy and Film Optics Laboratory, UFRGS, Instituto de Física, Av. Bento Gonçalves 9500, P.O. Box 15051, 91501-970, Porto Alegre, RS, Brazil
Laboratório de Fotoquímica e Superfícies (LAFOS), UFRGS, Instituto de Química, Universidade Federal do Rio Grande do Sul, UFRGS, Avenida Bento Gonçalves 9500, P.O. Box 15003, 91501-970, Porto Alegre, RS, Brazil
Departamento de Engenharia Química - Centro de Ciências Exatas e Tecnologia, Universidade de, Universidade de Caxias do Sul, UCS, Caxias do Sul, RS, Brazil
E-mail: [email protected] (A.F.F.); [email protected] (D.E.W.). Tel: +55-51 3308.6508 (A.F.F.); +55-51 3308.6204 (D.E.W.). Fax: +55-51 3308.7286 (A.F.F.); +55-51 3308.7304 (D.E.W.).
Cite this: ACS Appl. Mater. Interfaces 2011, 3, 10, 3981–3987
Publication Date (Web):September 15, 2011
https://doi.org/10.1021/am200854r
Copyright © 2011 American Chemical Society
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Abstract

Micro- and nanostructures of Ti-γCu (γ = 0, 30, 50, 70, and 100 wt %) intermetallic alloys were produced through a single anodization step. It was found that the original alloy composition influences the final oxide morphology obtained after anodization which presented formation of a microstructure with nanotubes, nanoparticles or nanopillars on the surface. Pure Ti and Cu oxide metals and their alloys presented hydrophilic or superhydrophilic properties immediately after anodization. When the anodized pure metal and/or Ti-γCu surfaces were functionalized with trimethoxypropylsilane (TPMSi), by dipping and coating with a thin perfluorinated layer, the treated substrates became in all cases superhydrophobic (water contact angles in the range of 152–166°), showing excellent self-cleaning properties with hysteresis below 3°. These results can be explained by a combination of nanomicro morphologies with low surface energy compounds in the topmost monolayers. The decrease in hysteresis was associated with a higher M–OH bond concentration on the anodized surfaces, which allowed for more complete TMPSi coating coverage. This study also indicates that easy and effective fabrication of superhydrophobic surfaces in pure metals and alloys is possible without involving traditional multistep processes.

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Crystalline structure information on the Ti-γCu intermetallic alloys after the anodization process (PDF). This material is available free of charge via the Internet at http://pubs.acs.org.

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