In situ reversible underwater superwetting transition by electrochemical atomic alternation

Wang, Qianbin; Xu, Bojie; Hao, Qing; Wang, Dong; Liu, Huan; Jiang, Lei

doi:10.1038/s41467-019-09201-1

Cited by 31 publications

(29 citation statements)

References 40 publications

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“…The interfacial energies of the coating that is preferably wetted by either oil ( E 0 ) or water ( E w ) in aqueous medium are further studied. The energy gap can be written into: [ 44 ]

\begin{matrix} Δ E = R (γ_{ws} - γ_{os}) S_{os} - γ_{ow} S_{ow} \end{matrix}

…”

Section: Methodsmentioning

confidence: 99%

“…[33][34][35] Further, subtle controlling superantiwetting states from single to quadruple extreme liquid repellence in the oil-water-air system is still extremely lacking. Recently, stimuli-responsive organic and inorganic building blocks (such as titanium dioxide, [36,37] zinc oxide, [38] polypyrrole, [39] and polyaniline [40] ) are widely exploited to construct smart interfacial materials with switchable superwetting behaviors under temperature, [41] light illumination, [42,43] electric field, [44,45] and pH stimulus. [46] However, the investigations toward switchable superwetting behaviors on the resulting stimuli-responsive interfacial materials are only limited in one certain medium.…”

mentioning

confidence: 99%

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Programming Multiphase Media Superwetting States in the Oil–Water–Air System: Evolutions in Hydrophobic–Hydrophilic Surface Heterogeneous Chemistry

Sun

Guo

2020

Advanced Materials

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Studies toward tailoring macroscopic extreme wetting behaviors on a certain well‐defined surface in multiphase media are significant but still at an infant stage. Herein, superantiwetting evolutions in the oil–water–air system can be programmed from single to quadruple superrepellence by controlling the surface hydrophobic–hydrophilic heterogeneous chemistry. Ammonia vapor exposure makes the realization of challenging superhydrophilicity–superoleophobicity possible in air medium, causing the transition from quadruple to triple superantiwetting states in the oil–water–air system. Upon UV illumination, only single superrepellence–underwater superoleophobicity is maintained on titanium dioxide (TiO2, P25)‐based coatings. A reversible transition between underoil superhydrophilicity and superhydrophobicity via an alternating UV irradiation and heating process leads to a switching between “water‐absorbing” and “size‐sieving” effects in water‐in‐oil emulsion separation. A comparative study for investigating two such effects in emulsion separation is further investigated. The current conceptual insights not only extend superwetting states to multiphase media, but can also deepen the understanding of the relationship between macroscopic extreme wetting behaviors and surface chemistry.

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“…The interfacial energies of the coating that is preferably wetted by either oil ( E 0 ) or water ( E w ) in aqueous medium are further studied. The energy gap can be written into: [ 44 ]

\begin{matrix} Δ E = R (γ_{ws} - γ_{os}) S_{os} - γ_{ow} S_{ow} \end{matrix}

…”

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

Programming Multiphase Media Superwetting States in the Oil–Water–Air System: Evolutions in Hydrophobic–Hydrophilic Surface Heterogeneous Chemistry

Sun

Guo

2020

Advanced Materials

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“…Wang et al [88] proposed a strategy to achieve an in situ reversible adhesion transition between the underwater superoleophilic and superoleophobic states by constructing a binary textured surface. Taking the Cu/Sn composite system as an example, when closing and opening an external circuit, the reversible transition was realized (figure 8a).…”

Section: Underwater Environmentmentioning

confidence: 99%

Stimuli-responsive surfaces for switchable wettability and adhesion

et al. 2021

J. R. Soc. Interface.

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Diverse unique surfaces exist in nature, e.g. lotus leaf, rose petal and rice leaf. They show similar contact angles but different adhesion properties. According to the different wettability and adhesion characteristics, this review reclassifies different contact states of droplets on surfaces. Inspired by the biological surfaces, smart artificial surfaces have been developed which respond to external stimuli and consequently switch between different states. Responsive surfaces driven by various stimuli, e.g. stretching, magnetic, photo, electric, temperature, humidity and pH, are discussed. Studies reporting on either atmospheric or underwater environments are discussed. The application of tailoring surface wettability and adhesion includes microfluidics/droplet manipulation, liquid transport and harvesting, water energy harvesting and flexible smart devices. Particular attention is placed on the horizontal comparison of smart surfaces with the same stimuli. Finally, the current challenges and future prospects in this field are also identified.

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“…By electrodepositing tin layer on the copper electrode, Wang et al obtained a copper/tin system with in situ reversible superwetting transition between underwater superhydrophilic and superoleophobic properties by electrochemical atomic alternation (Fig. 6c) [74] . The deposition of tin can significantly reduce the surface energy of the copper electrode and can be dissolved by removing the potential, thereby restoring the initial high energy state of the copper, which can realize the whole in situ reversible superwetting conversion via the switch of on/off potential.…”

Section: Electricmentioning

confidence: 99%

“…(b) Protein and bacterial adhesion and wettability onto the undoped (orange-colored film) and doped (green-colored film) colloidally templated polythiophene film [70] . (c) The in situ reversible superwetting transition between underwater superhydrophilic and superoleophobic properties by electrochemical atomic alternation [74] . (d) Appling the voltage between the droplet and the substrate, different wetting states on the nanostructured substrate [77] .…”

Section: Magneticmentioning

confidence: 99%

Smart Bionic Surfaces with Switchable Wettability and Applications

Fan

Liu

et al. 2021

J Bionic Eng

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In order to satisfy the needs of different applications and more complex intelligent devices, smart control of surface wettability will be necessary and desirable, which gradually become a hot spot and focus in the field of interface wetting. Herein, we review interfacial wetting states related to switchable wettability on superwettable materials, including several classical wetting models and liquid adhesive behaviors based on the surface of natural creatures with special wettability. This review mainly focuses on the recent developments of the smart surfaces with switchable wettability and the corresponding regulatory mechanisms under external stimuli, which is mainly governed by the transformation of surface chemical composition and geometrical structures. Among that, various external stimuli such as physical stimulation (temperature, light, electric, magnetic, mechanical stress), chemical stimulation (pH, ion, solvent) and dual or multi-triggered stimulation have been sought out to realize the regulation of surface wettability. Moreover, we also summarize the applications of smart surfaces in different fields, such as oil/water separation, programmable transportation, anti-biofouling, detection and delivery, smart soft robotic etc. Furthermore, current limitations and future perspective in the development of smart wetting surfaces are also given. This review aims to offer deep insights into the recent developments and responsive mechanisms in smart biomimetic surfaces with switchable wettability under external various stimuli, so as to provide a guidance for the design of smart surfaces and expand the scope of both fundamental research and practical applications.

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In situ reversible underwater superwetting transition by electrochemical atomic alternation

Cited by 31 publications

References 40 publications

Programming Multiphase Media Superwetting States in the Oil–Water–Air System: Evolutions in Hydrophobic–Hydrophilic Surface Heterogeneous Chemistry

Programming Multiphase Media Superwetting States in the Oil–Water–Air System: Evolutions in Hydrophobic–Hydrophilic Surface Heterogeneous Chemistry

Stimuli-responsive surfaces for switchable wettability and adhesion

Smart Bionic Surfaces with Switchable Wettability and Applications

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