A smart switchable bioinspired copper foam responding to different pH droplets for reversible oil–water separation

Liu, Yan; Zhang, Kaiteng; Son, Yan; Zhang, Wei; Spindler, Lena Marie; Han, Zhiwu; Ren, Luquan

doi:10.1039/c6ta10772a

Cited by 83 publications

(35 citation statements)

References 51 publications

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“…The absorption intensity of P = O groups becomes significantly weak after being cross-linked with Fe (III) ion, and -OH peak at 3328 cm −1 becomes a little stronger (Figure 2a,b green curve). After hydrophobic modification, the characteristic absorption peaks of HT at 1471 cm −1 (-CS-), 2848 cm −1 (-CH 2 -) and 2925 cm −1 (-CH 3 ) appear (Figure 2a,b blue curve) [43]. These results confirm the successful incorporation of the hydrophobic function HT on the surface of the sponge.…”

Section: Oil/water Separation Experimentssupporting

confidence: 61%

Plant-Inspired Layer-by-Layer Self-Assembly of Super-Hydrophobic Coating for Oil Spill Cleanup

et al. 2019

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A versatile, facile, energy-saving, low-cost and plant-inspired self-assembly strategy was used to prepare super-hydrophobic coating in this study. Concretely, an appealing super-hydrophobicity surface was obtained by designing a molecular building block phytic acid (PA)-Fe (III) complex to anchor the substrate and hydrophobic thiol groups (HT). The facile and green modification method can be applied to variety of substrates. The as-prepared PA-Fe (III)–HT coated melamine composite sponge possesses both super-hydrophobic and superlipophilicity property. Moreover, it displays superior efficiency to separate the oil–water mixture and splendid oil spill cleanup.

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Section: Oil/water Separation Experimentssupporting

confidence: 61%

Plant-Inspired Layer-by-Layer Self-Assembly of Super-Hydrophobic Coating for Oil Spill Cleanup

et al. 2019

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“…[158][159][160][161][162][163] For example, Wang and co-workers reported a pH-responsive smart surface that allows oil wetting underwater, repels water at pH 6.5, and blocks oil at pH 2.0. [160] The HS(CH 2 ) 9 CH 3 and HS(CH 2 ) 10 COOH mixed-thiol-modified mesh can also be used to bidirectionally separate oil-water mixtures.…”

Section: Ph-responsive Surfaces 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

102

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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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“…The porous 3D network of the foam surface provides not only microscale roughness but also tunnels for liquid absorption or separation. Liu et al reported a smart copper foam for pH‐responsive reversible separation of oil/water mixtures. The copper foam was roughened first by immersion into an AgNO 3 solution, after which a rough layer of silver was deposited onto the smooth copper skeleton surface.…”

Section: Manipulation Of Liquid Wetting Behaviorsmentioning

confidence: 99%

Stimuli‐Responsive Bioinspired Materials for Controllable Liquid Manipulation: Principles, Fabrication, and Applications

Wang

Xin

2017

Adv Funct Materials

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Many emerging interfacial technologies, such as self-cleaning surfaces, oil/ water separation, water collection, and microfluidics, are essentially liquid manipulation processes. In this regard, micro-nanostructures of the living organisms are highly preferable, by virtue of the evolutionary pressure and the adaptation to the specific environments, to inspire the optimization of man-made interfaces. With the increasing demands of modern life, research, and industry, intelligent materials with stimuli-responsive liquid manipulation functions have gained substantial attention from interfacial scientists. This review introduces the recent progress in the development of stimuli-responsive liquid-manipulating materials with bioinspired structures and surface chemistry according to two classified manipulation modes: (i) smart manipulation of liquid wetting behaviors, including lyophobic/lyophilic and superlyophobic/superlyophilic, and (ii) smart manipulation of liquid motion behaviors, including coalescence, transportation, rolling/adhesion, and sliding/pinning.At the beginning of the presentation of each classification, the theoretical basis and the sources of inspiration are introduced comprehensively to ensure a better understanding. This review mainly focuses on the mechanisms, fabrication, and applications of the state-of-the-art works related to smart and biomimetic liquid-manipulating materials. Finally, conclusions and future prospects are provided, and the remaining problems and promising breakthroughs in fabricating large-scale, cost-effective, and efficient smart liquid-manipulating materials are outlined.

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A smart switchable bioinspired copper foam responding to different pH droplets for reversible oil–water separation

Abstract: A novel pH-responsive smart device has been developed for continuous separation of oil/water mixtures.

Cited by 83 publications

References 51 publications

Plant-Inspired Layer-by-Layer Self-Assembly of Super-Hydrophobic Coating for Oil Spill Cleanup

Plant-Inspired Layer-by-Layer Self-Assembly of Super-Hydrophobic Coating for Oil Spill Cleanup

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

Stimuli‐Responsive Bioinspired Materials for Controllable Liquid Manipulation: Principles, Fabrication, and Applications

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