A multifunctional graphene composite coating with switchable wettability

Gao, Hanpeng; Liu, Yan; Wang, Guoyong; Li, Shuyi; Han, Zhiwu; Ren, Luquan

doi:10.1016/j.cej.2021.128862

Cited by 25 publications

(12 citation statements)

References 49 publications

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“…Under the irradiation of UV light on the surface of TiO 2 , electrons are excited from the valence to the conduction band, leaving holes in the valence band. The holes diffusing randomly to the surface can cleave Ti–O bonds, resulting in the formation of oxygen vacancies. , Hydroxyl groups and some coexisting molecular water are adsorbed on the oxygen vacancies, thus exhibiting hydrophilicity. , It is confirmed that there is a competitive adsorption relationship between H 2 O and O 2 on the oxygen vacancies generated by UV light on the surface of TiO 2 . , After heating, O 2 is more easily adsorbed on the TiO 2 surface to form Ti–O bonds, which restores the hydrophobic property of the surface . With the increase of UV irradiation time, the adsorption of hydrophilic groups on the surface of TiO 2 coated with fluorocarbon chains increases, resulting in the transition of an SHB copper foam surface toward hydrophilicity.…”

Section: Methodsmentioning

confidence: 86%

“…25,28 It is confirmed that there is a competitive adsorption relationship between H 2 O and O 2 on the oxygen vacancies generated by UV light on the surface of TiO 2 . 29,30 After heating, O 2 is more easily adsorbed on the TiO 2 surface to form Ti−O bonds, which restores the hydrophobic property of the surface. 29 With the increase of UV irradiation time, the adsorption of hydrophilic groups on the surface of TiO 2 coated with fluorocarbon chains increases, resulting in the transition of an SHB copper foam surface toward hydrophilicity.…”

Section: Preparation and Mechanism Of Copper Foam With Switchable Wet...mentioning

confidence: 99%

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Ultraviolet-Driven Janus Foams with Wetting Gradients: Unidirectional Penetration Control for Underwater Bubbles

Dai

Guo

Liu

2022

ACS Appl. Mater. Interfaces

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Understanding the behavior of underwater bubbles and enabling their effective manipulation is important for bubble capture, collection, and transport. Here, to discuss the underwater permeation behavior of bubbles and critical influencing parameters in this process, the copper foams with tunable wettability were fabricated by utilizing the light-stimulated wettability response of TiO 2 . The Janus copper foams had different wettability gradients from superhydrophobic/hydrophobic to superhydrophobic/hydrophilic after UV irradiation at different times, and the bubbles on the surfaces showed distinctly diverse penetration behaviors. In particular, the constructed superhydrophobic/hydrophilic surfaces showed more difficult to achieve bubble penetration than the fully superhydrophobic, superhydrophobic/hydrophobic surface. It was found that the wetting states of the foams exposed to different irradiation times underwater plays a crucial role in the bubble penetration behavior. In other words, the difficulty of bubble penetration depends on the difficulty of bubble transition from gas− liquid contact to gas−solid contact. This facile and low-cost fabrication approach for Janus foams provided a valuable approach to understand the penetration behaviors of underwater bubbles, which is significant for expanding potential applications in bubble capture, bubble transport, and control of unstable gas reactions in underwater conditions.

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Section: Methodsmentioning

confidence: 86%

Section: Preparation and Mechanism Of Copper Foam With Switchable Wet...mentioning

confidence: 99%

Ultraviolet-Driven Janus Foams with Wetting Gradients: Unidirectional Penetration Control for Underwater Bubbles

Dai

Guo

Liu

2022

ACS Appl. Mater. Interfaces

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“…The formed vacancies easily absorb water, which is beneficial to the formation of Ti–OH. The surface energy increases with increasing hydroxyl groups, so that the wettability of titanium dioxide will be hydrophilic . However, the wettability of silica does not change after UV irradiation.…”

Section: Resultsmentioning

confidence: 99%

“…The surface energy increases with increasing hydroxyl groups, so that the wettability of titanium dioxide will be hydrophilic. 30 However, the wettability of silica does not change after UV irradiation. Hydrophilic silica and hydrophobic titanium dioxide make the membrane still superhydrophobic in air.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Simple Method for the Fabrication of Multiple Superwetting Surfaces with Photoresponse

et al. 2021

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There have been many studies on special wetting surfaces, but most of them just stay superlyophobic in air or underwater. In this work, a membrane with photoresponse is fabricated by spraying hybrid particles of silicon and titanium dioxide. Under the combined action of hybrid particles and 1H,1H,2H,2H-perfluorodecyltrimethoxysilane, the prepared membrane is superhydrophobic in air. Because of the presence of titanium dioxide, the membrane can realize the transformation from superoleophilic underwater to superoleophobic underwater through UV irradiation and heating. Surprisingly, the membranes with superoleophobicity underwater are also superhydrophobic underoil. Thanks to this unique wettability transition, the prepared membrane can be applied to emulsion separation and fog harvesting. This is inspiring for the preparation and the multifunctional application of multiphase media superlyophobic surfaces.

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“…Graphene is an excellent additive candidate to fabricate superhydrophobic coatings [96,[122][123][124][125][126][127]. Graphene also refines the grain size of the coating and this smaller grain size can provide a smaller cathode/anode surface ratio which is effective against localized corrosion [128,129].…”

Section: Anti-corrosion Propertiesmentioning

confidence: 99%

Graphene derivatives reinforced metal matrix nanocomposite coatings: A review

et al. 2022

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Due to the extraordinary mechanical, thermal, and electrical properties of graphene, graphene oxide (GO), and reduced graphene oxide (rGO), these materials have the potential to become ideal nanofillers in the electrodeposited nanocomposite coatings. This article provides an overview of literature on the improvements of properties associated with graphene, GO, and rGO-reinforced coatings, along with the processing parameters and mechanisms that would lead to these improvements in electrodeposited metal matrix nanocomposite coatings, where those affected the microstructural, mechanical, tribological, and anti-corrosion characteristics of coatings. The challenges associated with the electroplating of nanocomposite coatings are addressed. The results of this survey indicated that adding graphene into the plating bath led to a finer crystalline size in the composite coating due to increasing the potential development of specific crystalline planes and the number of heterogeneous nucleation sites. This consequently caused an improvement in hardness and in tribological properties of the electrodeposited coating. In graphene reinforced metallic composites, the severe adhesive wear mechanism for pure metallic coatings was replaced by abrasive wear and slight adhesive wear, where the formation of a tribolayer at the contact surface increased the wear resistance and decreased friction coefficient. Furthermore, superhydrophobicity and smaller grain size resulted from embedding graphene in the coating. It also provided a smaller cathode/anode surface ratio against localized corrosion, which has been found to be the main anti-corrosion mechanism for graphene/metal coating. Lastly, the study offers a discussion of the areas of research that need further attention to make these high-performance nanocomposite coatings more suitable for industrial applications.

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A multifunctional graphene composite coating with switchable wettability

Cited by 25 publications

References 49 publications

Ultraviolet-Driven Janus Foams with Wetting Gradients: Unidirectional Penetration Control for Underwater Bubbles

Ultraviolet-Driven Janus Foams with Wetting Gradients: Unidirectional Penetration Control for Underwater Bubbles

Simple Method for the Fabrication of Multiple Superwetting Surfaces with Photoresponse

Graphene derivatives reinforced metal matrix nanocomposite coatings: A review

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