Preparation of Parabolic Superhydrophobic Material for Oil-Water Separation

Xiao-ying, Qiao; Yang, Chenxi; Zhang, Qian; Yang, Sen; Chen, Yangyang; Zhang, Dan; Yuan, Xiaoyu; Wang, Wenke; Zhao, Yaqian

doi:10.3390/ma11101914

Cited by 12 publications

(7 citation statements)

References 45 publications

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“…The contact angle of the water droplets is less than 90 • . However, for hydrophobic surfaces, the droplets were not easily spread and appeared spherical on the surface, the contact angle of the water droplets is greater than 90 • [43]. It is generally believed that as the contact angle increases, the hydrophobic property improves.…”

Section: Hydrophobic Performancementioning

confidence: 99%

“…From Table 1, the CA of the copper sheet modified with SA was always bigger than that of unmodified with SA. That was due to the low surface energy being a key factor in achieving superhydrophobicity [43]. The surface free energy can affect the value of the contact angle; the smaller the surface free energy is, the larger the contact angle is.…”

Section: Hydrophobic Performancementioning

confidence: 99%

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Hydrophobic and Anti-Fouling Performance of Surface on Parabolic Morphology

Liu

Yang

Chen

et al. 2020

IJERPH

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The hydrophobicity and anti-fouling properties of materials have important application value in industrial and agricultural production and people's daily life. To study the relationship between the unit width L 0 of the parabolic hydrophobic material and the hydrophobicity and anti-fouling properties, the rough surface structure of the parabolic with different widths was prepared by grinding with different SiC sandpapers, and further, to obtain hydrophobic materials through chemical oxidation and chemical etching, and modification with stearic acid (SA). The morphology, surface wetting and anti-fouling properties of the modified materials were characterized by SEM and contact angle measurement. The oil-water separation performance and self-cleaning performance of the materials were explored. The surface of the modified copper sheet forms a rough structure similar to a paraboloid. When ground with 1500 grit SiC sandpaper, it is more conducive to increase the hydrophobicity of the copper sheet surface and increase the contact angle of water droplets on the copper surface. Additionally, the self-cleaning and anti-fouling experiments showed that as L 0 decreases, copper sheets were less able to stick to foreign things such as soil, and the better the self-cleaning and anti-fouling performance was. Based on the oil-water separation experiment of copper mesh, the lower L 0 has a higher oil-water separation efficiency. The results showed that material with parabolic morphology has great self-cleaning, anti-fouling, and oil-water separation performance. The smaller the L 0 was, the larger the contact angle and the better hydrophobic performance and self-cleaning performance were.

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Section: Hydrophobic Performancementioning

confidence: 99%

Section: Hydrophobic Performancementioning

confidence: 99%

Hydrophobic and Anti-Fouling Performance of Surface on Parabolic Morphology

Liu

Yang

Chen

et al. 2020

IJERPH

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“…Research on superhydrophobic [ 1 , 2 ], superoleophobic [ 3 , 4 ], superamphiphobic [ 4 , 5 , 6 , 7 ] and superoleophilic [ 8 , 9 , 10 ] surfaces has developed rapidly in recent years [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ]. Meanwhile, an increasing number of applications for such surfaces, including self-cleaning [ 21 ], anti-fingerprint coatings [ 22 ], anti-fog coatings [ 23 ], microdroplet transfer technology [ 24 ] and oil–water separation [ 25 , 26 , 27 , 28 , 29 , 30 ], have been investigated. Superhydrophilic surfaces have been drawing extensive attention since Fujishima found that nanoscale TiO 2 possesses superhydrophilic properties when exposed to light and recovers its hydrophobic nature in the dark with cyclic reversibility [ 31 ].…”

Section: Introductionmentioning

confidence: 99%

Micro/Nanoscale Structured Superhydrophilic and Underwater Superoleophobic Hybrid-Coated Mesh for High-Efficiency Oil/Water Separation

et al. 2020

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A novel micro/nanoscale rough structured superhydrophilic hybrid-coated mesh that shows underwater superoleophobic behavior is fabricated by spray casting or dipping nanoparticle–polymer suspensions on stainless steel mesh substrates. Water droplets can spread over the mesh completely; meanwhile, oil droplets can roll off the mesh at low tilt angles without any penetration. Besides overcoming the oil-fouling problem of many superhydrophilic coatings, this superhydrophilic and underwater superoleophobic mesh can be used to separate oil and water. The simple method used here to prepare the organic–inorganic hybrid coatings successfully produced controllable micro-nano binary roughness and also achieved a rough topography of micro-nano binary structure by controlling the content of inorganic particles. The mechanism of oil–water separation by the superhydrophilic and superoleophobic membrane is rationalized by considering capillary mechanics. Tetraethyl orathosilicate (TEOS) as a base was used to prepare the nano-SiO2 solution as a nano-dopant through a sol-gel process, while polyvinyl alcohol (PVA) was used as the film binder and glutaraldehyde as the cross-linking agent; the mixture was dip-coated on the surface of 300-mesh stainless steel mesh to form superhydrophilic and underwater superoleophobic film. Properties of nano-SiO2 represented by infrared spectroscopy and surface topography of the film observed under scanning electron microscope (SEM) indicated that the film surface had a coarse micro–nano binary structure; the effect of nano-SiO2 doping amount on the film’s surface topography and the effect of such surface topography on hydrophilicity of the film were studied; contact angle of water on such surface was tested as 0° by the surface contact angle tester and spread quickly; the underwater contact angle to oil was 158°, showing superhydrophilic and underwater superoleophobic properties. The effect of the dosing amount of cross-linking agent to the waterproof swelling property and the permeate flux of the film were studied; the oil–water separation effect of the film to oil–water suspension and oil–water emulsion was studied too, and in both cases the separation efficiency reached 99%, which finally reduced the oil content to be lower than 50 mg/L. The effect of filtration times to permeate flux was studied, and it was found that the more hydrophilic the film was, the stronger the stain resistance would be, and the permeate flux would gradually decrease along with the increase of filtration times.

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“…Apart from that, further applications and processes dependent on the wettability phenomenon include printing, adhesion, coating, lubrication, air conditioning, desalination, corrosion prevention, oil-water separation, anti-icing, food packaging, etc. [8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Static Wettability of Differently Mechanically Treated and Amphiphobic-Coated Aluminium Surfaces

et al. 2020

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Wettability, roughness and surface treatment methods are essential for the majority of practical applications, where liquid–solid surface interactions take place. The present study experimentally investigated the influence of different mechanical surface treatment methods on the static wettability of uncoated and amphiphobic-coated aluminium alloy (AlMg3) samples, specially focusing on the interaction between surface finishing and coating. Five different surfaces were prepared: as-received substrate, polished, sandpapered, fleece-abraded and sandblasted. After characterisation, the samples were spray-coated using an amphiphobic coating. The characterisation of the uncoated and coated samples involved measurements of the roughness parameters and the apparent contact angles of demineralized water and rapeseed oil. The coating was initially characterised regarding its adhesion to the sample and elevated temperature stability. The applied surface treatments resulted in the scattered sample roughness in the range of Sa = 0.3–15.8 µm, water contact angles of θ a p , w = 78°–106° and extremely low oil contact angles. Coating the samples more than doubled the surface roughness to Sa = 13.3–29 µm, whereas the initial surface treatment properties (structure, anisotropy, etc.) were entirely repressed by the coating properties. Coating led the water contact angles to increase to θ a p , w _ c o a t e d = 162°–173° and even more pronounced oil contact angles to increase to θ a p , o _ c o a t e d = 139°–150°, classifying the surfaces as superhydrophobic and oleophobic.

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Preparation of Parabolic Superhydrophobic Material for Oil-Water Separation

Cited by 12 publications

References 45 publications

Hydrophobic and Anti-Fouling Performance of Surface on Parabolic Morphology

Hydrophobic and Anti-Fouling Performance of Surface on Parabolic Morphology

Micro/Nanoscale Structured Superhydrophilic and Underwater Superoleophobic Hybrid-Coated Mesh for High-Efficiency Oil/Water Separation

Static Wettability of Differently Mechanically Treated and Amphiphobic-Coated Aluminium Surfaces

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