A metallic anti-biofouling surface with a hierarchical topography containing nanostructures on curved micro-riblets

Microsystems & Nanoengineering

Sunmok Kwon¹  Jeehyeon Lee¹  Joon Sang Lee¹  Shinill Kang¹  Taekyung Kim¹ 

[1] National Center for Optically-assisted high precision Mechanical Systems, Yonsei University;

关键词: Anti-biofouling;    Superhydrophilic;    Hierarchical topography;    Metallic engineered surface;    Nanoimprinting, static immersion test, field trials;   

DOI  :  10.1038/s41378-021-00341-3

来源: DOAJ

【 摘 要 】

Abstract Metallic surface finishes have been used in the anti-biofouling, but it is very difficult to produce surfaces with hierarchically ordered structures. In the present study, anti-biofouling metallic surfaces with nanostructures superimposed on curved micro-riblets were produced via top-down fabrication. According to the attachment theory, these surfaces feature few attachment points for organisms, the nanostructures prevent the attachment of bacteria and algal zoospores, while the micro-riblets prohibit the settlement of macrofoulers. Anodic oxidation was performed to induce superhydrophilicity. It forms a hydration layer on the surface, which physically blocks foulant adsorption along with the anti-biofouling topography. We characterized the surfaces via scanning electron and atomic force microscopy, contact-angle measurement, and wear-resistance testing. The contact angle of the hierarchical structures was less than 1°. Laboratory settlement assays verified that bacterial attachment was dramatically reduced by the nanostructures and/or the hydration layer, attributable to superhydrophilicity. The micro-riblets prohibited the settlement of macrofoulers. Over 77 days of static immersion in the sea during summer, the metallic surface showed significantly less biofouling compared to a surface painted with an anticorrosive coating.

【 授权许可】

Unknown