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Designing Robust Underwater Superoleophobic Microstructure on Copper Substrate

Abstract

Recently, surfaces with robust underwater superoleophobicity have attracted much attention. Although it is recognized that stable microstructures are significant for such surfaces, until now, a clear picture of how the microstructure features such as morphology, size, etc. influence its own stability and related wettability is still missing. Herein, three low adhesive underwater superoleophobic copper surfaces with different microstructures (hemispheric, pinecone-like, and honeycomb) were first prepared, and then the stability of these microstructures were examined by a series of physical and chemical damage experiments (sand grain abrasion, corrosion in acid/basic solutions, etc.). The results indicate that the hemispheric microstructure is more stable than the other two microstructures and corresponding surface has the robust underwater superoleophobicity. Theoretical simulation analysis further confirms the experimental results and reveals that different stabilities are ascribed to different stress distributions on these microstructures under external force due to distinct microstructure shapes. Furthermore, based on the same design strategy, a robust underwater superoleophobic oil/water separation copper mesh film was also prepared. This work first time gives an insight into the effect of microstructure features on their stability and related underwater oil-repellent property, which could provide us with some fresh design guidances for robust superwetting surfaces.

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Publication details

The article was received on 27 Jun 2018, accepted on 05 Oct 2018 and first published on 08 Oct 2018


Article type: Paper
DOI: 10.1039/C8NR05173A
Citation: Nanoscale, 2018, Accepted Manuscript
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    Designing Robust Underwater Superoleophobic Microstructure on Copper Substrate

    C. Li, H. Lai, Z. Cheng, J. Yan and M. An, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR05173A

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