Drop impact on elastic superhydrophobic films: From pancake bouncing to saucer bouncing

Huang, Liu; Pan, Wenfeng; Chen, Yang; Ming, Pingmei; Song, Jinlong; Wang, Xuyue; Hua, Shungang

doi:10.1016/j.matlet.2020.129076

Cited by 9 publications

(10 citation statements)

References 10 publications

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“…superhydrophobic surface can also be ejected from the surface in a short time. Huang et al 161 used a spray method to prepare a superhydrophobic surface on a polyurethane film. This film dramatically reduced the contact time of impact droplets.…”

Section: Droplets Bouncing and Sheddingmentioning

confidence: 99%

“…Not only could the square groove significantly reduce the contact time of the bouncing droplets with the supercooled surface, but experiments proved that droplets on the irregular superhydrophobic surface can also be ejected from the surface in a short time. Huang et al 161 used a spray method to prepare a superhydrophobic surface on a polyurethane film. This film dramatically reduced the contact time of impact droplets.…”

Section: Ice-proof and Icephobicity Strategiesmentioning

confidence: 99%

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Recent advances in bioinspired superhydrophobic ice-proof surfaces: challenges and prospects

2022

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Section: Droplets Bouncing and Sheddingmentioning

confidence: 99%

Section: Ice-proof and Icephobicity Strategiesmentioning

confidence: 99%

Recent advances in bioinspired superhydrophobic ice-proof surfaces: challenges and prospects

2022

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“…A comprehensive understanding of the drop impact of SH surfaces is essential, especially for anti-icing [ 183 ], dropwise-condensation [ 184 ], and self-cleaning properties [ 185 ]. Such phenomena are mainly characterized by two dimensionless numbers including the Weber number (

) and Reynolds number (

), where

, and

are the density, the surface tension, and the viscosity of the drop, respectively.…”

Section: Characterization Of the Static And Dynamic Wetting Propertie...mentioning

confidence: 99%

Advances in the Fabrication and Characterization of Superhydrophobic Surfaces Inspired by the Lotus Leaf

et al. 2022

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Nature has proven to be a valuable resource in inspiring the development of novel technologies. The field of biomimetics emerged centuries ago as scientists sought to understand the fundamental science behind the extraordinary properties of organisms in nature and applied the new science to mimic a desired property using various materials. Through evolution, living organisms have developed specialized surface coatings and chemistries with extraordinary properties such as the superhydrophobicity, which has been exploited to maintain structural integrity and for survival in harsh environments. The Lotus leaf is one of many examples which has inspired the fabrication of superhydrophobic surfaces. In this review, the fundamental science, supported by rigorous derivations from a thermodynamic perspective, is presented to explain the origin of superhydrophobicity. Based on theory, the interplay between surface morphology and chemistry is shown to influence surface wetting properties of materials. Various fabrication techniques to create superhydrophobic surfaces are also presented along with the corresponding advantages and/or disadvantages. Recent advances in the characterization techniques used to quantify the superhydrophobicity of surfaces is presented with respect to accuracy and sensitivity of the measurements. Challenges associated with the fabrication and characterization of superhydrophobic surfaces are also discussed.

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“…Huang et al reported a kind of elastic superhydrophobic thin film, which was a commercial polyurethane film modified by hydrophobic nanoparticles. A step-like reduction in the contact time was observed with the increase in the Weber number ( We ), and the droplets exhibited a pancake shape and a saucer shape at intermediate and high We values, respectively . The contact time was significantly reduced by the momentum and energy transformation between the surface and the droplets even though the surface was not decorated with macrostructures.…”

Section: Introductionmentioning

confidence: 99%

“…A step-like reduction in the contact time was observed with the increase in the Weber number (We), and the droplets exhibited a pancake shape and a saucer shape at intermediate and high We values, respectively. 34 The contact time was significantly reduced by the momentum and energy transformation between the surface and the droplets even though the surface was not decorated with macrostructures. However, the conventional processing of relatively larger-scaled structures, e.g., with a high aspect ratio or conical shapes, on a flexible counterpart is still difficult to realize, which thus imposes the limitation to obtain a well-controlled pancake rebound for contact time control such as that on a rigid branch.…”

Section: ■ Introductionmentioning

confidence: 99%

Regulation of Droplet Rebound Behavior with Contact Time Control on a Flexible and Superhydrophobic Film

Ding¹,

Dai²,

Chen³

et al. 2022

Langmuir

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Rapid droplet detachment from the surface in a “pancake rebound” has recently attracted abundant interest owing to the contact time control for applications in anti-icing and self-cleaning. Even though the pancake rebound on rigid substrates has been realized, the establishment of artificial structures on a flexible counterpart with droplet impact behavior studies has rarely been reported. Here, we introduced a facile approach to fabricating a flexible superhydrophobic film decorated with tunable hierarchical micro/nanostructures for water repellency. With the appropriately optimized architecture, the pancake rebound with reduced contact time can be realized when reaching a specific Weber number on the microcones. We also observed that the pancake rebound on microcilia could be realized by regulating the energy-transfer process on the flexible film during the droplet impact. A tightly stretched and suspended film can serve as the “spring” to store the elastic energy transferred from the kinetic energy of the penetrated droplet while converting back to kinetic energy during the emptying process with a reduced contact time of 5.2 ms. With the preserved water repellency on diverse curvatures, the study raises a new avenue to realize superhydrophobic surfaces and rapid droplet detachment with the potential for a broader spectrum toward practical scenarios in our daily life.

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Drop impact on elastic superhydrophobic films: From pancake bouncing to saucer bouncing

Cited by 9 publications

References 10 publications

Recent advances in bioinspired superhydrophobic ice-proof surfaces: challenges and prospects

Recent advances in bioinspired superhydrophobic ice-proof surfaces: challenges and prospects

Advances in the Fabrication and Characterization of Superhydrophobic Surfaces Inspired by the Lotus Leaf

Regulation of Droplet Rebound Behavior with Contact Time Control on a Flexible and Superhydrophobic Film

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