Approaching the theoretical contact time of a bouncing droplet on the rational macrostructured superhydrophobic surfaces

Shen, Yizhou; Tao, Jie; Tao, Haijun; Chen, S.; Pan, Lei; Wang, T.

doi:10.1063/1.4931095

Cited by 104 publications

(79 citation statements)

References 29 publications

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“…B) The impact processes of water droplets on superhydrophobic surfaces with different macrotextures captured by a high‐speed camera. Reproduced with permission . Copyright 2015, AIP Publishing LLC.…”

Section: The Mechanisms Of Anti‐icing and Icephobicitymentioning

confidence: 99%

Bioinspired Surfaces with Superwettability for Anti‐Icing and Ice‐Phobic Application: Concept, Mechanism, and Design

Zhang

Huang

Cheng

et al. 2017

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Ice accumulation poses a series of severe issues in daily life. Inspired by the nature, superwettability surfaces have attracted great interests from fundamental research to anti-icing and ice-phobic applications. Here, recently published literature about the mechanism of ice prevention is reviewed, with a focus on the anti-icing and ice-phobic mechanisms, encompassing the behavior of condensate microdrops on the surface, wetting, ice nucleation, and freezing. Then, a detailed account of the innovative fabrication and fundamental research of anti-icing materials with special wettability is summarized with a focus on recent progresses including low-surface energy coatings and liquid-infused layered coatings. Finally, special attention is paid to a discussion about advantages and disadvantages of the technologies, as well as factors that affect the anti-icing and ice-phobic efficiency. Outlooks and the challenges for future development of the anti-icing and ice-phobic technology are presented and discussed.

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Section: The Mechanisms Of Anti‐icing and Icephobicitymentioning

confidence: 99%

Bioinspired Surfaces with Superwettability for Anti‐Icing and Ice‐Phobic Application: Concept, Mechanism, and Design

Zhang

Huang

Cheng

et al. 2017

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249

121

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“…As shown in Figure b, when the drop impacting on the ridges is much smaller than the drop size, it splits into satellite ones and results in around 37% contact time reduction compared to that on controlled surfaces. Gauthier et al and Shen et al further demonstrated that by the design of macrotexture surfaces with different patterns such as Y‐shape or cross‐shape, drops can be configured into different subunits and leave the surface with a reduced contact time (Figure c) . Recently, Liu et al fabricated curved macrotextures (convex and/or concave) with the curvature of radius comparable to the drop size .…”

Section: Approaches To Enhance Drop Mobilitymentioning

confidence: 99%

Bioinspired Interfacial Materials with Enhanced Drop Mobility: From Fundamentals to Multifunctional Applications

Hao

Liu

Chen

et al. 2016

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The development of bioinspired interfacial materials with enhanced drop mobility that mimic the innate functionalities of nature will have a significant impact on the energy, environment and global healthcare. Despite extensive progress, state of the art interfacial materials have not reached the level of maturity sufficient for industrial applications in terms of scalability, stability, and reliability. These are complicated by their operating environments and lack of facile approaches to control the local structural texture and chemical composition at multiple length scales. The recent advances in the fundamental understanding are reviewed, as well as practical applications of bioinspired interfacial materials, with an emphasis on the drop bouncing and coalescence-induced jumping behaviors. Perspectives on how to catalyze new discoveries and to foster technological adoption to move this exciting area forward are also suggested.

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“…For example, during the high-speed impact of supercooled (−50°C) water droplets, aircraft surfaces are designed to compel water droplets to rebound off the surfaces before icing. 8 Another example is the fast drop detachment from natural plants and biomimetic surfaces, which significantly decreases the likelihood of virus and bacteria deposition because many pathogens and diseases are transmitted through drops. 9 Other examples include waterproof umbrellas and self-cleaning windshields.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the contact time of the entire impact process is considered to be crucial to these applications. 8 Suitable surface designs could effectively reduce the liquid-solid contact time. [10][11][12][13][14] Artificial superhydrophobic surfaces (SHSs) with contact angles larger than 150°are extremely low-energy surfaces that facilitate rapid drop bounce off due to the low friction between the drop and the substrate.…”

Section: Introductionmentioning

confidence: 99%

“…With this method, when a drop impacted on a ridge that was much smaller than the drop size, it split into satellite droplets that led to an~37% contact time reduction when compared with that on an SHS without wires. Gauthier et al 13 and Shen et al 8 further demonstrated that by fabricating macrotextured surfaces with different patterns, such as Y shapes and cross shapes, drops could be configured into different subunits and leave the surface with a reduced contact time. Liu et al…”

Section: Introductionmentioning

confidence: 99%

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Reducing the contact time using macro anisotropic superhydrophobic surfaces — effect of parallel wire spacing on the drop impact

Song

Liu

et al. 2017

NPG Asia Mater

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Surfaces designed to reduce the contact time of impacting droplets are potentially of great importance for fundamental science and technological applications, for example, anti-icing, self-cleaning and heating transfer applications. Previous studies have shown that the contact time can be reduced via introducing one or several crossing macroscale wires on superhydrophobic surfaces (SHSs). However, the impacts that strike far from the wires (off-center impacts) have contact times that are equal to those obtained on SHSs. Here we demonstrate that this problem can be largely solved by using macro anisotropic SHSs (macroaniso-SHSs)-in which the wires are parallel and macroscaled. The droplet contact time depends on the spacing between the macrostripes and is remarkably reduced by 40-50% when the spacing is comparable to the droplet size. Obvious differences in the contact time are not observed for impacts that are centered on the stripe and in the groove. The impacts centered in the groove produce new hydrodynamics that are characterized by extended spreading, easy break up and bouncing in a flying-eagle configuration. The study discusses the underlying mechanisms of the impact processes. Moreover, the effect of parallel wires on the contact time is discussed by comparing the droplet impact data for grooved rice leaves and non-grooved cabbage leaves. The enhanced drop mobility associated with the macro-aniso-SHSs should be very useful in many industrial applications.

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Approaching the theoretical contact time of a bouncing droplet on the rational macrostructured superhydrophobic surfaces

Cited by 104 publications

References 29 publications

Bioinspired Surfaces with Superwettability for Anti‐Icing and Ice‐Phobic Application: Concept, Mechanism, and Design

Bioinspired Surfaces with Superwettability for Anti‐Icing and Ice‐Phobic Application: Concept, Mechanism, and Design

Bioinspired Interfacial Materials with Enhanced Drop Mobility: From Fundamentals to Multifunctional Applications

Reducing the contact time using macro anisotropic superhydrophobic surfaces — effect of parallel wire spacing on the drop impact

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