Reversible transition between superhydrophobicity and superhydrophilicity of a silver surface

Xu, Puhao; Wang, Fajun; Yang, Chao; Ou, Junfei; Li, Wen; Amirfazli, Alidad

doi:10.1016/j.surfcoat.2016.03.052

Cited by 19 publications

(13 citation statements)

References 32 publications

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“…The C–C peak plays a major role in reducing surface energy. The transition from superhydrophilicity to superhydrophobicity of the silver mesh before and after heating is attributed to spontaneous adsorption of airborne hydrocarbons and desorption of water molecules during heating . Before heating, the silver mesh was mainly adsorbed by water molecules owing to the displacement reaction in aqueous solution.…”

Section: Resultsmentioning

confidence: 99%

“…The transition from superhydrophilicity to superhydrophobicity of the silver mesh before and after heating is attributed to spontaneous adsorption of airborne hydrocarbons and desorption of water molecules during heating. 36 Before heating, the silver mesh was mainly adsorbed by water molecules owing to the displacement reaction in aqueous solution. Nevertheless, adsorbed water molecules could evaporate or desorb from the silver mesh during the heating process.…”

Section: Morphology Chemical Composition and Wettabilitymentioning

confidence: 99%

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A smart engineering material with UV‐induced switchable wettability for controllable oil/water separation

Chen

Fan

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND Recently, some smart superwetting materials with switchable wettability have attracted great interest due to their ability to controllably separate oil/water mixtures. However, the fabrication of most smart materials requires complex procedures and precious chemical reagents for surface modification, limiting large‐scale engineering applications of the fabricated smart surface. RESULTS In this study, a silver surface was prepared by extremely simple displacement deposition on copper mesh. The silver‐coated mesh exhibits superhydrophobicity and superoleophilicity after heating treatment, which allows oil to permeate while blocking water. Interestingly, the heated silver‐coated mesh gains superhydrophilic and underwater superoleophobic properties after UV irradiation, which allows water to permeate but prevents oil. As a consequence, the as‐fabricated mesh is capable of achieving two completely different oil/water separation processes. In addition, the silver‐coated mesh shows excellent environmental stability under a series of harsh conditions. CONCLUSION A novel smart engineering material with UV‐induced switchable wettability was successfully fabricated. In view of the rapid and simple fabrication approach, it is envisaged that this work will provide a promising prospect of large‐scale production in smart oil/water separation materials. © 2017 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Section: Morphology Chemical Composition and Wettabilitymentioning

confidence: 99%

A smart engineering material with UV‐induced switchable wettability for controllable oil/water separation

Chen

Fan

et al. 2017

J of Chemical Tech & Biotech

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“…In contrast, hydrophobicity of metal surface is due to partial monolayer of carbonaceous contamination . After UV irradiation, there is removal of the carbon contaminants which gradually decreases with increasing time of irradiation . As a consequence, the surface switched from hydrophobicity to hydrophilicity after a period of UV exposure.…”

Section: Resultsmentioning

confidence: 99%

Iodization‐Induced Reversible Wettability in Nanostructured Ag Films

Praveena

Vanjarana

Purkayastha

et al. 2017

Physica Status Solidi (a)

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Ag films of 5 nm thickness were iodized for durations up to 3 h leading to the formation of b-AgI structure. The water contact angle (WCA) for the uniodized and as-deposited Ag film was 107.2 which is decreased to 70.7 on iodization for 3 h. In contrast, the Ag films annealed at 300 C for 2 h prior to iodization showed a water contact angle of 40.3 . The WCA decreased further to 14.9 after iodization for 3 h. This hydrophobic-hydrophilic transition can be related to the chemical modification of the surface change in crystal structure and variation in surface roughness. Significantly, the films also exhibited reversible wettabilty under UV irradiation.

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“…Moreover, functional super-hydrophobic MS with high stability and reusability as well as excellent selectivity are worthy of further study [30]. Recently, it has been reported that superhydrophobic pure metal surfaces can be prepared by hydrophobic methods without the functionalization of hydrophobic molecules [31][32][33]. Under heating conditions, the surface energy of metals can be effectively reduced by spontaneous adsorption of carbon pollutants; it may provide a new, low-cost green pathway to fabricate superhydrophobic MS, without using any additional low surface energy materials.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Super-Hydrophobic 3D Porous Nanocomposites by One Step Reaction at Room Temperature for Water Treatment

Ding

Cao

et al. 2021

Coatings

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Melamine sponge (MS) has the characteristics of multilayer network structure, high porosity, adjustable pore structure, and low price, which is considered to be an ideal material for oil leakage treatment. Here, a facile, economical, environmental friendly, and one step reaction was developed to fabricate Ag nanoparticles (NPs) decorated MS composite with tannic acid (TA) as a reducing agent. By reduction reaction, the super-hydrophobic and super-oleophylic surface of the MS–TA–Ag composite was formed, demonstrating a single selectivity for oil and water. Thus, the adsorption capacity of MS–TA–Ag composites for various oils/organic solvents can reach 48~129 times its own weight and and display superior efficiency to separate oil/organic solvent from the water. In addition, the MS–TA–Ag composite has stable super-hydrophobicity and reusability. It is exciting that modified MS exhibits excellent chemical stability properties after a long processing time with strong alkali, strong acids, and salt solutions. The simple strategy provides a method for the preparation of large-scale oil spill cleaning and recovery materials.

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Reversible transition between superhydrophobicity and superhydrophilicity of a silver surface

Cited by 19 publications

References 32 publications

A smart engineering material with UV‐induced switchable wettability for controllable oil/water separation

A smart engineering material with UV‐induced switchable wettability for controllable oil/water separation

Iodization‐Induced Reversible Wettability in Nanostructured Ag Films

Preparation of Super-Hydrophobic 3D Porous Nanocomposites by One Step Reaction at Room Temperature for Water Treatment

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