Robust and superhydrophobic coating highly resistant to wear and efficient in water/oil separation

SURFACE & COATINGS TECHNOLOGY

卷:364

Article

Rius-Ayra, Oriol¹  Castellote-Alvarez, Roger¹  Escobar, Ana M.¹  Llorca-Isern, Nuria¹ 

[1] Univ Barcelona, Fac Quim, CMQF, Dept Ciencia Mat & Quim Fis, Marti & Franques 1, E-08028 Barcelona, Spain

关键词: Superhydrophobic;    Electrodeposition;    Wear;    Robust;    Water/oil separation;    Composite;    Hierarchical structure;   

DOI  :  10.1016/j.surfcoat.2019.01.077

来源: Elsevier

【 摘 要 】

Here, we report a straightforward and rapid process using fatty acids to produce a stable superhydrophobic hybrid composite coating on aluminium substrate which is highly resistant to wear under environmental conditions. Furthermore, this novel superhydrophobic metal surface is highly efficient at separating of water/oil systems. The single-step process we adopt involves electrochemical deposition of ZnCl2, alpha-Al2O3 and lauric acid (C11H23COOH) onto commercial pure aluminium substrate. The resultant static contact angle (170 degrees) and sliding angle (1 degrees) are those of a superhydrophobic coating with self-cleaning properties; while chemical analysis shows that this is the result of generation of zinc laurate (Zn(C11H20COO)(2)) as a major compound that increases the superhydrophobic character of the coating, generating a flower-like structure 70 nm thick. Different wear tests show the coating is resistant to severe conditions, confirming its real potential against weathering, including sand and water erosion. Finally, a water/oil separation test determined 99% separation efficiency in hexane and ether petroleum systems, in a laboratory-made storage tank.

【 授权许可】

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