Uni‐Directional Transportation on Peristome‐Mimetic Surfaces for Completely Wetting Liquids

Li, Chuxin; Li, Ning; Zhang, Xinshi; Dong, Zhichao; Chen, Huawei; Jiang, Lei

doi:10.1002/anie.201607514

Cited by 150 publications

(128 citation statements)

References 35 publications

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“…The water gathered on the surface continues to spread forward and fills three microcavities at the front side. Consistent with our previous findings, [14] the specific geometries of arched cavities give rise to a significant difference in Laplace pressure, x L , which acts on the liquid and propels the forward liquid spreading. [33] The corresponding Laplace pressure gradient ≈ γcosθ a /αx, finally yields a capillary driving force, F d ≈ γL 2 sinθ A cosθ a /x, over the liquid.…”

Section: Inchworm-like Crawling Liquid Stripsupporting

confidence: 91%

Droplets Crawling on Peristome‐Mimetic Surfaces

Zhou

et al. 2020

Adv Funct Materials

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Controlling the mobility of liquids along surfaces is widely exploited in various technologies to achieve self‐lubrication, phase‐change heat transfer, and microfluidics. Despite commendable progress in directional liquid transport on peristome‐mimetic surfaces, liquid merely spreads directionally with a wetted trail remaining. It is a challenge to achieve directional contracting of spreading liquid at the rear side and ultimately unidirectional motion in bulk from one site to another. Here it is shown that liquids resting on the peristome‐mimetic surfaces can crawl directionally and rapidly in an inchworms‐like way under the action of sudden spontaneous bubbles levitation. Vacuuming or chemical reaction induces sudden nucleation, growth, coalescence (Ostwald ripening process), and rupture of bubbles in the asymmetric microcavities of the peristome‐mimetic surface with directional overpressure beneath the liquid, resulting in the guided contracting and spreading of the liquid. Bubbles regulate this new mode of liquid directional motion. The strategy offers opportunities for liquids directional motion for various applications, such as in microfluidic devices, oil–water separation, and water collection systems.

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Section: Inchworm-like Crawling Liquid Stripsupporting

confidence: 91%

Droplets Crawling on Peristome‐Mimetic Surfaces

Zhou

et al. 2020

Adv Funct Materials

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“…[179] Meanwhile, by using the high-resolution stereo-lithography method, they fabricated a peristome-mimicking surface which also showed a spontaneous overflow-controlled liquid unidirectional transportation. [180] The properties of fast and long-distance unidirectional spreading on the bioinspired surface might be a benefit for various fields, such as water-harvesting, nonpowered delivery of medicine, and self-lubrication in mechanical engineering.…”

Section: The Fabrication Of Bio-inspired Artificial Peristome Surfacementioning

confidence: 99%

Bioinspired Special Wettability Surfaces: From Fundamental Research to Water Harvesting Applications

Zhang

Huang

Chen

et al. 2016

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Nowadays, the pollution of water has become worse in many parts of the world, which causes a severe shortage of clean water and attracts widespread attention worldwide. Bioinspired from nature, i.e. spider silk, cactus, Namib desert beetle, Nepenthes alata, special wettability surfaces have attracted great interest from fundamental research to water-harvesting applications. Here, recently published literature about creatures possessing water-harvesting ability are reviewed, with a focus on the corresponding water-harvesting mechanisms of creatures in dry or arid regions, consisting of the theory of wetting and transporting. Then a detailed account of the innovative fabrication technologies and bionic water-harvesting materials with special wetting are summarized, i.e. bio-inspired artificial spider silk, bio-inspired artificial cactus-like structures, and bio-inspired artificial Namib desert beetle-like surfaces. Special attentions are paid to the discussion of the advantages and disadvantages of the technologies, as well as factors that affect the amount of water-harvesting. Finally, conclusions, future outlooks and the current challenges for future development of the water-harvesting technology are presented and discussed.

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“…The surface structure of Nepenthes peristome, which is arch-shaped microcavities, had been mimicked for self-driven unidirectional liquid transport, and it is also a common water collection phenomenon in nature. [314,316] Surface structure induced wettability gradient was also applied to actuate droplet movement. [313] Zhang et al [312] obtained a surface with geometric gradient by colloidal lithography and inclined reactive ion etching, where the gradient of micro-/nanostructure led to a gradient of wettability.…”

Section: Surface-directed Liquid Transportmentioning

confidence: 99%

Micro‐/Nanostructured Interface for Liquid Manipulation and Its Applications

Duan

Zheng

Zhao

et al. 2019

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Understanding the relationship between liquid manipulation and micro‐/nanostructured interfaces has gained much attention due to the wide potential applications in many fields, such as chemical and biomedical assays, environmental protection, industry, and even daily life. Much work has been done to construct various materials with interfacial liquid manipulation abilities, leading to a range of interesting applications. Herein, different fabrication methods from the top‐down approach to the bottom‐up approach and subsequent surface modifications of micro‐/nanostructured interfaces are first introduced. Then, interactions between the surface and liquid, including liquid wetting, liquid transportation, and a number of corresponding models, together with the definition of hydrophilic/hydrophobic, oleophilic/olephobic, the definition and mechanism of superwetting, including superhydrophobicity, superhydrophilicity, and superoleophobicity, are presented. The micro‐/nanostructured interface, with major applications in self‐cleaning, antifogging, anti‐icing, anticorrosion, drag‐reduction, oil–water separation, water collection, droplet (micro)array, and surface‐directed liquid transport, is summarized, and the mechanisms underlying each application are discussed. Finally, the remaining challenges and future perspectives in this area are included.

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Uni‐Directional Transportation on Peristome‐Mimetic Surfaces for Completely Wetting Liquids

Cited by 150 publications

References 35 publications

Droplets Crawling on Peristome‐Mimetic Surfaces

Droplets Crawling on Peristome‐Mimetic Surfaces

Bioinspired Special Wettability Surfaces: From Fundamental Research to Water Harvesting Applications

Micro‐/Nanostructured Interface for Liquid Manipulation and Its Applications

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