Prompting Splash Impact on Superamphiphobic Surfaces by Imposing a Viscous Part

Yu, Fengqi; Lin, Shiji; Yang, Jing; Fan, Yue; Wang, Dehui; Chen, Longquan; Deng, Xu

doi:10.1002/advs.201902687

Cited by 38 publications

(15 citation statements)

References 45 publications

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“…The bouncing of compound droplets would be also different from pure droplets, while intensive investigations are mainly on the pure droplets bouncing. The compound droplets [12,15,94,[240][241][242][243] may bring more opportunities for the applications due to their richness and various combinations: the wetting overlaying liquid can be beneficial to the deposition of the high-surface-tension core droplet; the environmental overlaying liquid can be a chemical shield for chemical droplet; the sacrificial overlaying liquid can protect the core liquid droplet under extreme conditions.…”

Section: Concluding Remarks and Perspectivesmentioning

confidence: 99%

Droplet Bouncing: Fundamentals, Regulations, and Applications

Han

Tang

et al. 2022

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Droplet impact is a ubiquitous phenomenon in nature, daily life, and industrial processes. It is thus crucial to tune the impact outcomes for various applications. As a special outcome of droplet impact, the bouncing of droplets keeps the form of the droplets after the impact and minimizes the energy loss during the impact, being beneficial in many applications. A unified understanding of droplet bouncing is in high demand for effective development of new techniques to serve applications. This review shows the fundamentals, regulations, and applications of millimeter‐sized droplet bouncing on solid surfaces and same/miscible liquids (liquid pool and another droplet). Regulation methods and current applications are summarized, and potential directions are proposed.

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Section: Concluding Remarks and Perspectivesmentioning

confidence: 99%

Droplet Bouncing: Fundamentals, Regulations, and Applications

Han

Tang

et al. 2022

Small

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“…Bouncing dynamics on non-wettable macro-textured surfaces can be extended to applications, such as environmental oil-water separation, waterproofing, and biomedical interactions. For example, the impact of core-shell or Janus drops on the surfaces can be used for a liquid separation method using the asymmetric bouncing dynamics induced by different liquid properties, such as density, viscosity, and interfacial tension [34]. In addition, bouncing dynamics on non-wettable macro-textured surfaces can also offer practical implications for designing water-repellent fibers or fabrics, such as hydrophobic fibers [35] and hair array [36,37].…”

Section: Discussionmentioning

confidence: 99%

Effect of Viscosity on Bouncing Dynamics of Elliptical Footprint Drops on Non-Wettable Ridged Surfaces

Yun

2021

Polymers

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An initial drop shape can alter the bouncing dynamics and significantly decrease the residence time on superhydrophobic surfaces. Elliptical footprint drops show asymmetric dynamics owing to a pronounced flow driven by the initial drop shape. However, the fundamental understanding of the effect of viscosity on the asymmetric dynamics has yet to be investigated, although viscous liquid drop impact on textured surfaces is of scientific and industrial importance. Here, the current study focuses on the impact of elliptical footprint drops with various liquid properties (density, surface tension, and viscosity), drop sizes, and impact velocities to study the bouncing dynamics and residence time on non-wettable ridged surfaces numerically by using a volume-of-fluid method. The underlying mechanism behind the variation in residence time is interpreted by analyzing the shape evolution, and the results are discussed in terms of the spreading, retraction, and bouncing. This study provides an insight on possible outcomes of viscous drops impinging on non-wettable surfaces and will help to design the desired spraying devices and macro-textured surfaces under different impact conditions, such as icephobic surfaces for freezing rain or viscous liquids.

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“…The spreading of the low-viscosity part and its rim instability were therefore promoted. 37 The threshold velocity of the splash can be regulated by varying the viscosity of the Janus drop, as shown in Figure 5g.…”

Section: Stability Of the Wetting State At The Solid−liquid Interfacementioning

confidence: 99%

“…Despite the uniform increase in drop viscosity that slows the impact and hinders the splash, the introduction of a partial high-viscosity phase onto a drop promotes the splashing during impact. 37 As shown in Figure 5f, when a glycerin drop was imposed on a water drop, the resulting drop, which was shaped into a Janus drop composed of a high viscosity part and low viscosity part, encounters splashing compared to a drop of water at the same impacting velocity. This is because the viscous stress that is applied by the low-viscosity water part propels the viscous glycerin part in the reverse orientation.…”

Section: Stability Of the Wetting State At The Solid−liquid Interfacementioning

confidence: 99%

Durable Super-repellent Surfaces: From Solid–Liquid Interaction to Applications

Wang

Yang

et al. 2021

Acc. Mater. Res.

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Conspectus A super-repellent surface is a type of liquid-repellency material that allows for various liquid drops to bead up, roll off, or even bounce back. Known for its ability to remain dry, perform self-cleaning, and have a low adhesion, a super-repellent surface presents great advantages in a number of applications. These include antifogging, anti-icing, oil/water separation, and fluid drag reduction. To fend off the liquids or drops, super-repellent surfaces combine the merits of surface chemistry and physical structure. By taking advantage of a low surface energy to prevent liquid from spreading, the super-repellent surfaces utilize the micronano structure to provide a framework that confines the solid–liquid interactions. Compared to beading up the drop of water, the repellence of liquid with low surface tension requires the subtle design of surface structure to resist the wetting of liquids. However, the inherent instabilities of the fragile micronano structure of super-repellent surfaces and solid–liquid interactions further make the fabrication of super-repellent surfaces complex to withstand dynamic environments (friction or wear) during application. In addition, the transparency and thermal stability of super-repellent surfaces are also the restrictive factors in some special application scenarios. To solve these challenges, durable super-repellent surfaces that can repel various liquids, possess robust mechanical and thermal stability, and show high transparency have been explored extensively in recent years. In this Account, we systematically review our recent efforts to promote the super-repellent surfaces for real-world applications. Super-repellent surfaces that exhibit excellent resistance to various liquids, including liquids with low surface tension or high viscosity, were subtly designed and fabricated in some manner. Considering the stability of the wetting state at the solid–liquid interface, we established an evaluation system that includes highly curved surfaces and high Laplace-pressure conditions. To further perfect the wetting mechanism at the solid–liquid interactions, the dynamic wettability of super-repellent surfaces regulated by surface charge enrichment that was generated from solid–liquid interface separation was investigated. To resolve the bottleneck problem of the mechanical stability of super-repellent surfaces in real-world applications, a new decoupling material design mechanism was proposed, with a nanostructure that maintains water repellency and a microstructure providing durability. On the basis of the performance of the liquid-repellency, transparency, and mechanical and thermal stability of the super-repellent surfaces, a series of applications were demonstrated, such as microsphere synthesis, drop transportation and manipulation, and self-cleaning solar panels. Finally, a concise summary of this Account, including challenges and opportunities in super-repellent materials, has been provided. This research provides important guidance on solid–liquid interactions for ...

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Prompting Splash Impact on Superamphiphobic Surfaces by Imposing a Viscous Part

Cited by 38 publications

References 45 publications

Droplet Bouncing: Fundamentals, Regulations, and Applications

Droplet Bouncing: Fundamentals, Regulations, and Applications

Effect of Viscosity on Bouncing Dynamics of Elliptical Footprint Drops on Non-Wettable Ridged Surfaces

Durable Super-repellent Surfaces: From Solid–Liquid Interaction to Applications

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