Combination of Bioinspiration: A General Route to Superhydrophobic Particles

Zhang, Liang; Wu, Junjie; Wang, Yongxin; Long, Yuhua; Zhao, Ning; Xu, Jie

doi:10.1021/ja303037j

Cited by 394 publications

(283 citation statements)

References 32 publications

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“…[142,143] In practical applications, magnetoresponsive nanoparticles and porous materials are beneficial to remotely treat oily water and separate the oil from the water surface by adjusting the magnetic field. In particular, superhydrophobic and superoleophilic porous magnetic materials with network structures (e.g., foams and sponges) have been extensively studied for selective absorption of oil, and rapid progress has been made in the field of oil-water separation.…”

Section: Magnetic-field-induced Selective Permeation For Separationmentioning

confidence: 99%

External‐Field‐Induced Gradient Wetting for Controllable Liquid Transport: From Movement on the Surface to Penetration into the Surface

Zhang

et al. 2017

Advanced Materials

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External‐field‐responsive liquid transport has received extensive research interest owing to its important applications in microfluidic devices, biological medical, liquid printing, separation, and so forth. To realize different levels of liquid transport on surfaces, the balance of the dynamic competing processes of gradient wetting and dewetting should be controlled to achieve good directionality, confined range, and selectivity of liquid wetting. Here, the recent progress in external‐field‐induced gradient wetting is summarized for controllable liquid transport from movement on the surface to penetration into the surface, particularly for liquid motion on, patterned wetting into, and permeation through films on superwetting surfaces with external field cooperation (e.g., light, electric fields, magnetic fields, temperature, pH, gas, solvent, and their combinations). The selected topics of external‐field‐induced liquid transport on the different levels of surfaces include directional liquid motion on the surface based on the wettability gradient under an external field, partial entry of a liquid into the surface to achieve patterned surface wettability for printing, and liquid‐selective permeation of the film for separation. The future prospects of external‐field‐responsive liquid transport are also discussed.

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Section: Magnetic-field-induced Selective Permeation For Separationmentioning

confidence: 99%

External‐Field‐Induced Gradient Wetting for Controllable Liquid Transport: From Movement on the Surface to Penetration into the Surface

Zhang

et al. 2017

Advanced Materials

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“…However, the smooth PDA coatings obtained by typical method can hardly form primary obvious hierarchical structure, thus with the following secondary reaction, only hydrophobic surfaces would be achieved [35]. Various nanoparticles including noble metal (Ag) [36], metallic oxide (Fe 3 O 4 ) [37], and silicon oxide [38] were incorporated through the catechol coordinate bonds and hydrogen bonds to create primary hierarchical structures on HNTs surfaces, however, this most-used approach suffered from a lot of disadvantages, such as high cost, time-consuming, and poor stability. Therefore, a direct way to control the roughness of PDA coatings without incorporation of nanoparticles was urgently needed.…”

Section: Preparation Process and Reaction Mechanismmentioning

confidence: 99%

Preparation of Robust Superhydrophobic Halloysite Clay Nanotubes via Mussel-Inspired Surface Modification

et al. 2017

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Abstract:In this study, a novel and convenient bio-inspired modification strategy was used to create stable superhydrophobic structures on halloysite clay nanotubes (HNTs) surfaces. The polydopamine (PDA) nanoparticles can firmly adhere on HNTs surfaces in a mail environment of pH 8.5 via the oxidative self-polymerization of dopamine and synthesize a rough nano-layer assisted with vitamin M, which provides a catechol functional platform for the secondary reaction to graft hydrophobic long-chain alkylamine for preparation of hierarchical micro/nano structures with superhydrophobic properties. The micromorphology, crystal structure, and surface chemical composition of the resultant superhydrophobic HNTs were characterized by field emission scanning electron (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). The as-formed surfaces exhibited outstanding superhydrophobicity with a water contact angle (CA) of 156.3 ± 2.3 • , while having little effect on the crystal structures of HNTs. Meanwhile, the resultant HNTs also showed robust stability that can conquer various harsh conditions including strong acidic/alkaline solutions, organic solvents, water boiling, ultrasonic cleaning, and outdoor solar radiation. In addition, the novel HNTs exhibited excellent packaged capabilities of phase change materials (PCMs) for practical application in thermal energy storage, which improved the mass fractions by 22.94% for stearic acid and showed good recyclability. These HNTs also exhibited good oil/water separation ability. Consequently, due to the superior merits of high efficiency, easy operation, and non-toxicity, this bionic surface modification approach may make HNTs have great potentials for extensive applications.

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“…It is well know that, inspired by mussel, dopamine has a strong adaptability to cover any type of surface and has attracted much interest for its simplicity, versatility, and wide applicability. 34 So, it has been extensively used as the mid-layer in membrane modification in the latest studies.…”

Section: ¹1mentioning

confidence: 99%

Superwetting Materials of Oil–Water Emulsion Separation

Guo

2015

Chemistry Letters

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, as a visiting scholar. Now he is a full professor in LICP financed by "Top Hundred Talents" program of CAS. Till now, he has published more than 100 papers about the interfaces of Materials.Mr. Yifan Si joined Prof. Guo's biomimetic materials of tribology (BMT) group at University of Hubei in 2014 in pursuing his Ph.D. degree. His current scientific interests are devoted to designing and fabricating superhydrophobic nanocoatings and studying their corresponding applications. AbstractWith industrial development and population expansion, the problem of water pollution has intensified. The purification of oily water, especially oilwater emulsions, is one of the important topics of environment protection. Traditional filter membranes, to some extent, are useful for the separations of oil water mixtures but suffer from many limitations and there is no effective way to achieve emulsified oilwater separation. Superwetting materials, based on bionics, have opened a brandnew door to membrane separation techniques. The rise and maturation of nanometer-scale materials also injects new vigor into this research area. In this paper, we review the contributions to oilwater emulsion separation in recent literatures. The principles of superwetting materials in separation of oilwater mixtures have been briefly stated at first. Some classical and latest examples, as well as some great work by our group, have been emphasized. Section 3 is the key point of this article. It covers the most valuable of recent progresses in advanced materials for oilwater emulsion separation, from novel polymer membranes to nanomaterial-based membranes. Of course, special-wettability materials and non-two-dimensional separation methods have also been instructive. The aim of the optimal design of superwetting membranes is to make future researches theoretical, instructive, and practical. Finally, some challenges and the potential promising breakthroughs in this field are also succinctly highlighted.

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Combination of Bioinspiration: A General Route to Superhydrophobic Particles

Cited by 394 publications

References 32 publications

External‐Field‐Induced Gradient Wetting for Controllable Liquid Transport: From Movement on the Surface to Penetration into the Surface

External‐Field‐Induced Gradient Wetting for Controllable Liquid Transport: From Movement on the Surface to Penetration into the Surface

Preparation of Robust Superhydrophobic Halloysite Clay Nanotubes via Mussel-Inspired Surface Modification

Superwetting Materials of Oil–Water Emulsion Separation

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