Laser-structured superhydrophobic/superoleophilic aluminum surfaces for efficient oil/water separation

Chen, Lie; Huang, Yating; Bennett, Peter; Zhou, Zheng; Yang, Qibiao; Liu, Dun

doi:10.1007/s11356-020-10177-5

Cited by 26 publications

(6 citation statements)

References 33 publications

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“…The distinct difference of the wetting scenarios for water and oil indicates that the laser-heat surface treatment method can effectively prepare superhydrophobic/superoleophilic Cu foam. The surface wettability measurement results in terms of oil and water subjected laser texturing and heat treatment obtained in this work agrees well with that in [ 34 ], demonstrating the effectiveness of the developed method for altering surface wettability.…”

Section: Resultssupporting

confidence: 87%

“…Similar to that of Zhang et al, the wettability of the fabricated brass sheet was changed from superhydrophilicity to high hydrophobicity after being exposed to ambient air for 12 days, and then the brass sheet can be used as a filter for the separation of organic solvents from water. Chen et al [ 34 ] drilled hole arrays on an aluminum plate using a nanosecond fiber laser and placed the laser-scanned aluminum plate in a vacuum oven at 100 °C for 24 h. The perforated aluminum plate showed superhydrophobicity/superoleophilicity and was used for effective oil–water separation. Xin et al [ 35 ] prepared super-wetting Cu foam with either superhydrophobicity or superhydrophilicity using nanosecond laser ablation followed by silanization or graphene oxide modification.…”

Section: Introductionmentioning

confidence: 99%

“…Although notable research progress has been achieved for the fabrication of thin metallic sheets or foam with high oil–water separation efficiency using a nanosecond pulsed laser, some key issues still remain and should be resolved. On the one hand, the post-process treatment after laser texturing usually requires several tens of hours to several days for wettability transition that can help to achieve oil–water separation [ 32 , 33 , 34 ], which has significantly decreased the processing efficiency; on the other hand, chemical reagents such as an FAS-17 solution can achieve fast wettability transition [ 35 ], while the reagent can be toxic and expensive, and thus will generate potential hazard to humans and the environment and increase the production cost. Therefore, the development of a nanosecond laser-based method for oil–water separation with high processing efficiency, low cost and environmental friendliness is still of particular interest for the surface engineering community.…”

Section: Introductionmentioning

confidence: 99%

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Laser-Heat Surface Treatment of Superwetting Copper Foam for Efficient Oil–Water Separation

et al. 2023

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Oil pollution in the ocean has been a great threaten to human health and the ecological environment, which has raised global concern. Therefore, it is of vital importance to develop simple and efficient techniques for oil–water separation. In this work, a facile and low-cost laser-heat surface treatment method was employed to fabricate superwetting copper (Cu) foam. Nanosecond laser surface texturing was first utilized to generate micro/nanostructures on the skeleton of Cu foam, which would exhibit superhydrophilicity/superoleophilicity. Subsequently, a post-process heat treatment would reduce the surface energy, thus altering the surface chemistry and the surface wettability would be converted to superhydrophobicity/superoleophilicity. With the opposite extreme wetting scenarios in terms of water and oil, the laser-heat treated Cu foam can be applied for oil–water separation and showed high separation efficiency and repeatability. This method can provide a simple and convenient avenue for oil–water separation.

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Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Laser-Heat Surface Treatment of Superwetting Copper Foam for Efficient Oil–Water Separation

et al. 2023

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“…If left for some time under ambient conditions, the surface gradually dehydrates to form hydroxyoxyaluminate with a lower surface energy. This effect can be accelerated and pushed to completion by applying heat, leading to surface superhydrophobicity [36,37]. The samples were then placed in an oven at 200 • C for 24 h to perform this conversion and generate SHPo surfaces without significant changes in the surface microstructures, as shown in figure 1(b).…”

Section: Laser Surface Treatmentmentioning

confidence: 99%

Capillary performance of vertically grooved wicks on laser-processed aluminum surfaces with different wettability

Chen

Bennett

et al. 2023

J. Phys. D: Appl. Phys.

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Ultra-thin heat pipes have been widely used for thermal management of electronic components. The capillary performance of the wicking structure is an essential factor that affects its heat transfer capability. In this study, superhydrophilic and superhydrophobic background surfaces were prepared on aluminum sheets using a nanosecond fiber laser. Superhydrophilic grooves with a width of 0.1-0.4 mm were fabricated on surfaces with different wettability by laser processing. The effects of the background wettability on the capillary performance of the grooves were investigated. When the groove widths were 0.1-0.2 mm, the water in the groove rose the fastest on the superhydrophobic background surface. As the groove width increased to 0.3-0.4 mm, the water in the groove on the superhydrophilic surface rose the most rapidly. Furthermore, the water absorption of grooves with the same width on the superhydrophilic background surface was always greater than that of the grooves on the other two surfaces. Therefore, a matching wettable background surface should be selected according to application requirements. A superhydrophobic background surface can be chosen when a faster rise in the speed of the water in the groove is preferred. In contrast, a superhydrophilic background surface is beneficial for improving the water absorption capacity. The water absorption of the groove on the superhydrophilic background surface reaches a maximum of 6.8 mg with a groove width of 0.4 mm, and the capillary performance parameters can reach 4.26e-7 N, which is 100.9 % enhanced over the pristine background surface. Thus, this study provides new ideas for improving the capillary performance of vertically grooved wicks.

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“…The massive discharge of industrial wastewater contaminated with oil, oil pollution due to daily human activities, and accidental oil spills in water systems are major environmental and health concerns [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ]. Thus, there is an urgent need for novel materials and processes to treat oil-containing wastewater.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Si-Based High-Efficiency and High-Durability Superhydrophilic-Underwater Superoleophobic Membrane of Oil–Water Separation

Fang

Chen

et al. 2021

Materials

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Oil pollution is caused by the frequent discharge of contaminated industrial wastewater and accidental oil spills and is a severe environmental and health concern. Therefore, efficient materials and processes for effective oil–water separation are being developed. Herein, SiO2-Na2SiO3-coated stainless steel fibers (SSF) with underwater superoleophobic and low-adhesion properties were successfully prepared via a one-step hydrothermal process. The modified surfaces were characterized with scanning electron microscopy (SEM), and contact angle measurements to observe the surface morphology, confirm the successful incorporation of SiO2, and evaluate the wettability, as well as with X-ray diffraction (XRD). The results revealed that SiO2 nanoparticles were successfully grown on the stainless-steel fiber surface through the facile hydrothermal synthesis, and the formation of sodium silicate was detected with XRD. The SiO2-Na2SiO3-coated SSF surface exhibited superior underwater superoleophobic properties (153–162°), super-hydrophilicity and high separation efficiency for dichloromethane–water, n-hexane–water, tetrachloromethane–water, paroline–water, and hexadecane–water mixtures. In addition, the as-prepared SiO2-Na2SiO3-coated SSF demonstrated superior wear resistance, long-term stability, and re-usability. We suggest that the improved durability may be due to the presence of sodium silicate that enhanced the membrane strength. The SiO2-Na2SiO3-coated SSF also exhibited desirable corrosion resistance in salty and acidic environments; however, further optimization is needed for their use in basic media. The current study presents a novel approach to fabricate high-performance oil–water separation membranes.

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Laser-structured superhydrophobic/superoleophilic aluminum surfaces for efficient oil/water separation

Cited by 26 publications

References 33 publications

Laser-Heat Surface Treatment of Superwetting Copper Foam for Efficient Oil–Water Separation

Laser-Heat Surface Treatment of Superwetting Copper Foam for Efficient Oil–Water Separation

Capillary performance of vertically grooved wicks on laser-processed aluminum surfaces with different wettability

Synthesis of Si-Based High-Efficiency and High-Durability Superhydrophilic-Underwater Superoleophobic Membrane of Oil–Water Separation

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