Durable superhydrophobic cotton filter prepared at low temperature for highly efficient hexane and water separation

Thi, Viet Ha Tran; Lee, Byeong–Kyu; Ngo, Chi-Vinh

doi:10.1016/j.jtice.2016.12.029

Cited by 17 publications

(5 citation statements)

References 39 publications

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“…These peaks correspond to the structure of ZnO according to the values of the Joint Committee on Powder Diffraction Standard (JCPDS) No. 36–1451 15,23,25 . Characteristic peaks at 2 θ = 30.1°, 43.1° and 53.5° are observed in the PU@ZnO@Fe 3 O 4 @SA sponge sample.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, the WCA tests were conducted at least five times at different positions on each sample. The sliding WCAs and shedding WCAs at intervals of 1° were also measured using a previously reported experimental unit 15 .…”

Section: Methodsmentioning

confidence: 99%

“…While the initial surface is hydrophilic, proper control of the roughness and a surface treatment or coating are required to switch from a hydrophilic state to a superhydrophobic state. Generally, superhydrophobic surfaces have been developed in the form of fabrics 15,16 , meshes 17 , films 18 and 3D porous materials 19 . Among these materials, commercially available polyurethane (PU) sponge, which has a high porosity, light weight and good elasticity, is a promising substrate for the preparation of a superhydrophobic material for oil-water separation and oil absorption.…”

Section: Introductionmentioning

confidence: 99%

“…The hydrophobicity was first derived from the microstructure, which was grown on the initial surface and was similar to that observed on the natural surface of Ramee leaves or Chinese watermelon. For this first approach towards engineering a suitable surface roughness, a zinc oxide (ZnO) coating layer was selected due to its superior abilities, which include easily controlled of structure growth, low cost and environmental non-toxicity 15,23 . After a facile ZnO coating step performed with a commercial microwave, the wettability of the PU sponge was transformed from a hydrophilic state to a hydrophobic state.…”

Section: Introductionmentioning

confidence: 99%

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Novel fabrication of a robust superhydrophobic PU@ZnO@Fe3O4@SA sponge and its application in oil-water separations

Tran

Lee

2017

Sci Rep

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We report a novel superhydrophobic material based on commercially available polyurethane (PU) sponge with high porosity, low density and good elasticity. The fabrication of a superhydrophobic sponge capable of efficiently separating oil from water was achieved by imitating or mimicking nature’s designs. The original PU sponge was coated with zinc oxide (ZnO), stearic acid (SA) and iron oxide particles (Fe3O4) via a facile and environmentally friendly method. After each treatment, the properties of the modified sponge were characterized, and the changes in wettability were examined. Water contact angle (WCA) measurements confirmed the excellent superhydrophobicity of the material withhigh static WCA of 161° andlow dynamic WCA (sliding WCA of 7° and shedding WCA of 8°). The fabricated sponge showed high efficiency in separation (over 99%) of different oils from water. Additionally, the fabricated PU@ZnO@Fe3O4@SA sponge could be magnetically guided to quickly absorb oil floating on the water surface. Moreover, the fabricated sponge showed excellent stability and reusability in terms of superhydrophobicity and oil absorption capacity. The durable, magnetic and superhydrophobic properties of the fabricated sponge render it applicable to the cleanup of marine oil spills and other oil-water separation issues, with eco-friendly recovery of the oil by simple squeezing process.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Novel fabrication of a robust superhydrophobic PU@ZnO@Fe3O4@SA sponge and its application in oil-water separations

Tran

Lee

2017

Sci Rep

Self Cite

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“…The wettability plays a crucial role in the potential application of surfaces such as antifogging display devices, eyeglasses, self‐cleaning windows, and water‐oil separation materials . Generally speaking, a superhydrophobic surface can be used for self‐cleaning with a higher water contact angle (CA) than 150° and a lower sliding angle (SA) than 10°, on which water droplets can easily roll off with a small angle of inclination.…”

Section: Introdutionmentioning

confidence: 99%

Hierarchical structure microspheres of PCL block copolymers via electrospraying as coatings for fabric with mechanical durability and self‐cleaning ability

Wang

2019

Polymers for Advanced Techs

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The various morphology and structure microspheres were fabricated via one-step single-solvent electrospraying of hydrophilic and hydrophobic block modified copolymer of polycaprolactone (PCL). A honeycomb-like hierarchical structure microspheres of PCL-b-PTFOA(4h) and abundant nanometer pores of PCL-b-PEG400 microspheres were obtained due to the solvent evaporation, thermally and polymer diffusioninduced phase separation effect. Furthermore, a superhydrophobic coatings and robust superhydrophobic-coated cotton woven fabric surfaces were prepared by using PCL-b-PTFOA(4h) microspheres with hierarchical structure and low surface energy. The contact angle (CA) and sliding angle (SA) of PCL-b-PTFOA (4h) microspheres-coated cotton woven fabric surfaces reached 164.4 ± 5.5°and6.8 ± 0.5°, respectively, which allows for self-cleaning. The self-cleaning test demonstrated that the coated superhydrophobic surface could shed aqueous dyes and dust without any trace. The superhydrophobic-coated fabric shows good soaping fastness against mechanical abrasion without significant reduction of CA. This electrospraying coating of block copolymers can provide a simple, facile, and promising technique for producing multifunctional textiles.

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Effect of Heat Treatment Temperature on the Wettability Transition from Hydrophilic to Superhydrophobic on Laser‐Ablated Metallic Surfaces

Ngo

Chun

2018

Adv Eng Mater

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Superhydrophobic metallic surfaces made via pulsed laser ablation have been utilized recently. Immediately after laser ablation, metallic surfaces become hydrophilic. By aging the laser‐ablated surface in ambient air for a relatively long period of time (several weeks to several months) or using a chemical coating post process, this type of surface becomes superhydrophobic. Herein, a facile post‐process heat treatment that does not use any harsh chemicals is introduced to reduce the wettability transition time from hydrophilicity to superhdyrophobicity compared to surfaces treated for extended periods of time in ambient air. Grid patterns are ablated on aluminum, copper, and titanium by a nanosecond pulsed laser. Then, facile post‐process heat treatment is applied at different temperatures. The effect of temperature on the wettability transition time is studied. The transition time is reduced from several weeks/months to a few hours. The wettability transition mechanism for each metal is also explained. Additionally, several potential applications, such as self‐cleaning, water positioning, and water transport, are proposed.

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Durable superhydrophobic cotton filter prepared at low temperature for highly efficient hexane and water separation

Cited by 17 publications

References 39 publications

Novel fabrication of a robust superhydrophobic PU@ZnO@Fe3O4@SA sponge and its application in oil-water separations

Novel fabrication of a robust superhydrophobic PU@ZnO@Fe3O4@SA sponge and its application in oil-water separations

Hierarchical structure microspheres of PCL block copolymers via electrospraying as coatings for fabric with mechanical durability and self‐cleaning ability

Effect of Heat Treatment Temperature on the Wettability Transition from Hydrophilic to Superhydrophobic on Laser‐Ablated Metallic Surfaces

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