Desert Beetle‐Inspired Superwettable Patterned Surfaces for Water Harvesting

Yu, Zhenwei; Yun, Frank Fei; Wang, Yanqin; Yao, Li; Dou, Shi Xue; Liu, Kesong; Jiang, Lei; Wang, Xiaolin

doi:10.1002/smll.201701403

Cited by 202 publications

(121 citation statements)

References 40 publications

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“…Because of its structural simplicity and outstanding water collecting capability, the hydrophilic‐hydrophobic patterned surface on the back of Namib desert beetle is extremely intriguing to be mimicked as water collecting surfaces . (Super)hydrophilic bumps patterned on (super)hydrophobic surface behave as nucleation sites, and when the condensed droplets grow to a certain size, the droplets will coalesce.…”

Section: Applicationsmentioning

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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Section: Applicationsmentioning

confidence: 99%

Micro‐/Nanostructured Interface for Liquid Manipulation and Its Applications

Duan

Zheng

Zhao

et al. 2019

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“…Figure c demonstrates the conceptual design of using superhydrophobic and para‐hydrophobic zones along with trichomes and parallel channels for an efficient dual way patterned water harvesting system. Previously, the Namib beetle garnered attention for efficient water harvesting using superhydrophobic and superhydrophilic patterned zones leading scientists to design patterned superhydrophilic and superhydrophobic zones for water harvesting . The superhydrophobic zones were used to channel the water, which collected upon the superhydrophilic zones.…”

Section: Resultsmentioning

confidence: 99%

Characterization and Bioreplication of Tradescantia pallida Inspired Biomimetic Superwettability for Dual Way Patterned Water Harvesting

Suvindran

Pan

et al. 2018

Adv Materials Inter

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Biomimicry elucidates nature's faultless synchronization of structure with function inspiring researchers to create designs that can achieve maximum performance with minimalistic resource exhaustion. Nature has evolved the invasive species Tradescantia pallida (T. pallida) with the ability to survive in drought lands. Since this species requires humidity to survive in those conditions it can be inferred that the T. pallida partakes of foliar atmospheric water harvesting. Herein, the wettability is tested with the study establishing that the leaf exhibits para‐hydrophobicity while demonstrating a static contact angle of 165°, whereas the morphological characterization reveals a complex hierarchical sculpturing with macroscale trichomes and parallel venations. Moreover, it is identified that the foliar water uptake occurs via the para‐hydrophobic surface and the hydrophobic trichomes subsequently guiding the water along the parallel channels creating a leaf that has an efficient dual way water harvesting system. These features render it capable of surviving in any habitat that validates nature's perfect unification of structure and function. Such multifunctional surfaces are a rarity thereby making them desirable for smart water harvesting designs. Thus inspired, a replica is developed which mimics the wettability with functional artificial trichomes and a potential dual way patterned water harvesting concept is presented.

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“…For example, superhydrophilic pitcher plant leaves help to capture prey and the superhydrophobic lotus leaf enables its self‐cleaning ability. Nature inspired superhydrophobic surfaces are of particular interest for application in antireflective coatings, anti‐icing surfaces, anti‐biofouling surfaces, water harvesting applications, self‐cleaning coatings, and so on …”

Section: Introductionmentioning

confidence: 81%

Wetting Transition from Lotus Leaf to Rose Petal using Modified Fly Ash

2019

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We present a facile and scalable approach to develop lotus leaf as well rose petal like superhydrophobic surfaces using fly ash (an industrial waste obtained from the burning of coal). To achieve this, as‐obtained fly ash powder with wide particle size distribution (FA) was processed through sedimentation technique to obtain fly ash powder with narrower particle size distribution (FAS) and modified with two different concentrations of stearic acid (SA) and treated at two different temperatures – one each below and above melting point of SA. All samples showed superhydrophobicity, where, the water contact angle (WCA) increased with an increase in the amount of stearic acid and modification temperature. Interestingly, the water droplets roll‐off from the modified FA surfaces at a small tilting angle of 5° similar to the lotus leaf, whereas, the modified FAS surfaces exhibited high adhesion for water droplets even when inverted, as in case of the rose petal. It was seen that drying at temperature lower than melting temperature of stearic acid introduced additional roughness, yet the WCA decreased. This is investigated to understand the effect of topology and substrate nature on WCA in different wetting states.

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Desert Beetle‐Inspired Superwettable Patterned Surfaces for Water Harvesting

Cited by 202 publications

References 40 publications

Micro‐/Nanostructured Interface for Liquid Manipulation and Its Applications

Micro‐/Nanostructured Interface for Liquid Manipulation and Its Applications

Characterization and Bioreplication of Tradescantia pallida Inspired Biomimetic Superwettability for Dual Way Patterned Water Harvesting

Wetting Transition from Lotus Leaf to Rose Petal using Modified Fly Ash

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