Underwater manipulation of oil droplets and bubbles on superhydrophobic surfaces <i>via</i> switchable adhesion

Gao, Dejun; Cao, Jian; Guo, Zhiguang

doi:10.1039/c9cc00271e

Cited by 21 publications

(7 citation statements)

References 29 publications

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“…Among different separation technologies that are applicable to industrial processes as well as our daily life 14,15 , membrane-shaped materials, such as mesh 16–22 , fabric 23–26 , and membrane materials 27–29 , have been gained widespread interest due to higher separation efficiency and probable use in large scale manufacturing 30–34 . Since surface wettability of these textured membranes can dramatically affect water or oil droplet adhesion between substrates, and hence affect the oil/water separation process 35–39 , designing and preparing wettability switchable membranes would be a convincing way to enable the separation process on demand 40–45 .…”

Section: Introductionmentioning

confidence: 99%

Reversibly switching water droplets wettability on hierarchical structured Cu2S mesh for efficient oil/water separation

Sheng

Cao

et al. 2019

Sci Rep

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Surfaces with reversible wettability have broad applications but remain challenging since the switching process is usually energy intensive and complex. In this paper, a pyramid shaped Cu 2 S film with hierarchical micro/nanostructures is formed on a commercial copper mesh. This film is formed by a spontaneous redox sulfuration reaction and results in a roughened surface, which enables reversible wetting transition between superhydrophilicity to superhydrophobicity. This switching occurs by simple processes such as alternately storing in air or using an ethanol solution treatment and yields cyclic wettability switching for many cycles. This convenient wetting transition behavior, as well as strong stability and efficient oil/water separation with efficiency exceeding 98%, renders it as a potentially useful mesh material for switchable surfaces.

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Section: Introductionmentioning

confidence: 99%

Reversibly switching water droplets wettability on hierarchical structured Cu2S mesh for efficient oil/water separation

Sheng

Cao

et al. 2019

Sci Rep

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“…In addition, the smart surface with switchable wettability can not only control the adhesion of droplets but also the gas and underwater oil, further helping to provide new opportunities for the development of smart switchable surfaces. Guo's team produced a smart superwetting surface with the properties of manipulation oil droplets and bubbles underwater via switchable adhesion upon ultraviolet response [176] . Liu et al reported a novel oil-triggered surface by switching wettability property between lotus-leaf and nepenthes, which was used in various droplet manipulation modes with real-time property [121] .…”

Section: Smart Soft Roboticmentioning

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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“…Copper T-shaped grooves 152.5˚ [197] Copper foil Microscale craters and nanoparticles 171˚ [198] Titanium alloy Randomly-distributed hemispherical features - [199] Electrochemical etching CA = contact angle, SA = sliding angle. Water CA is used to quantitatively compare among superhydrophobic surfaces.…”

Section: Aluminum Alloymentioning

confidence: 99%

Biomimetic Superlyophobic Metallic Surfaces: Focusing on Their Fabrication and Applications

Lian

Wang

et al. 2020

J Bionic Eng

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Metals are indispensable engineered materials for day-to-day life. Researches focused on metallic surfaces with superlyophobicity (superhydrophobicity, superoleophobicity, underwater superoleophobicity and slippery characteristic) have attracted much attention recently. Nature is a magician that gives each organic life a unique advantage. Researchers have created a large number of biomimetic superlyophobic metallic surfaces through various approaches. These biomimetic superlyophobic metallic surfaces exhibit advantages in many applications, such as self-cleaning, corrosion resistance, anti-icing, and drag reduction. In this review, the specific fabrication and applications of biomimetic superlyophobic metallic surfaces were reported. The remaining challenges and future outlook of biomimetic superlyophobic metallic surfaces were preliminarily analyzed. It is hoped that the review will be essential for broadening the scope of potential applications of metals and providing a powerful reference for future research on metal-based advanced functional materials.

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Underwater manipulation of oil droplets and bubbles on superhydrophobic surfaces via switchable adhesion

Abstract: UV light-responsive reversible switching of oil droplet and bubble adhesion underwater is realized to manipulate oil droplet or bubble motion and transportation.

Cited by 21 publications

References 29 publications

Reversibly switching water droplets wettability on hierarchical structured Cu2S mesh for efficient oil/water separation

Reversibly switching water droplets wettability on hierarchical structured Cu2S mesh for efficient oil/water separation

Smart Bionic Surfaces with Switchable Wettability and Applications

Biomimetic Superlyophobic Metallic Surfaces: Focusing on Their Fabrication and Applications

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