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Coatings 2019, 9(3), 157;

Electrophoretic Deposition of Graphene Oxide on Laser-Ablated Copper Mesh for Enhanced Oil/Water Separation

School of Aerospace Engineering, Xiamen University, 422 Siming South Road, Siming District, Xiamen 361005, China
Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen 361005, China
AECC South Industry Company Limited, Zhuzhou 412002, China
Authors to whom correspondence should be addressed.
Received: 19 January 2019 / Revised: 23 February 2019 / Accepted: 25 February 2019 / Published: 28 February 2019
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The fabrication of bionic surfaces resembling hydrophobic plants through micro manufacturing, which creates abundant multi-level micro/nanostructures and elemental variations, has been widely employed to change the surface wettability of metallic materials. Based on the mechanisms for selective permeation of various liquids, it could achieve the function of oil/water separation. Herein, a separation copper membrane fabricated with pulsed laser ablation and modified with graphene oxide (GO) deposition showed a synergetic effect on tunable surface wettability. Micro/nanostructures were generated on the copper substrate membrane through concentric circular scanning, which was followed by hole drilling. Afterwards, charged GO nanosheets were deposited via electrophoresis. The spacing of circular lines, the diameter of the holes and the abundant high-surface-energy hydrophilic oxygen contained in deposited GO amounts could be regulated in the laser processing and deposition, resulting in oleophobicity and hydrophilicity at the same time. The highest contact angle of oil in water of the prepared mesh could reach above 165° with a hole size of 200 µm and a circular line spacing of 100 µm after the laser processing. Water flux and oil-holding capacity, which represent the separation capability of the mesh, were also evaluated. The as-prepared separation mesh also showed great stability under harsh environments. View Full-Text
Keywords: oil/water separation; laser; graphene oxide; underwater superoleophobic; electrophoretic oil/water separation; laser; graphene oxide; underwater superoleophobic; electrophoretic

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Zhou, R.; Shen, F.; Cui, J.; Zhang, Y.; Yan, H.; Juan Carlos, S.S. Electrophoretic Deposition of Graphene Oxide on Laser-Ablated Copper Mesh for Enhanced Oil/Water Separation. Coatings 2019, 9, 157.

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