Bidirectional Transport of Split Droplets

Hu, Zhifeng; Chu, Fuqiang; Wu, Xiaomin; Ding, Siyu; Lin, Yukai

doi:10.1103/physrevapplied.18.044057

Cited by 20 publications

(16 citation statements)

References 53 publications

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“…There can be multiple rounds of rebounds and recontacts, and the impact velocity and rebound height both decrease with each round (Figure 8b), because the total energy of the impact droplet is continuously consumed by viscous dissipations. [135,136] Once the impact velocity is too low, that is less than about 0.1(𝜎/𝜌R 0 ) 1/2 (where (𝜎/𝜌R 0 ) 1/2 is the inertial-capillary velocity), the kinetic energy cannot overcome the contact-line pinning caused by contact angle [73] Copyright 2020, Wiley. b) Time-varied vertical displacement of the impact droplet during multiple rebound and refalling processes.…”

Section: Droplet Reboundmentioning

confidence: 99%

“…The ability of surface structures to regulate droplet rebound is relatively weak presently, and the horizontal transport distance of droplets for most structures is usually less than 5 times the droplet diameter. [47,135]…”

Section: Brief Summary Of Abilities Of Superhydrophobic Surfacesmentioning

confidence: 99%

“…Recently, it has been found that the ridge helps achieve efficient bidirectional transport of impact droplets. [ 135 ] Under the synergistic effect of droplet inertial force and the disturbance of the ridge on the liquid film, the droplet impacting on the ridge will split into two child‐droplets. The split droplets rebound towards both sides of the ridge, with a rebound trajectory similar to an eagle wing ( Figure a).…”

Section: Phenomena Mechanisms and Regulations Of Droplet Impactmentioning

confidence: 99%

“…The bidirectional transport of split droplets has the advantages of fast response (contact time is reduced by 50%), high lateral velocity (reaches 34% of impact velocity), and long transport distance (reaches 15 times the initial diameter of the droplet). [ 135 ] The dimple is a simple concave structure. A dimple allows impact droplets to move forward, backward, and rebound out of plane (Figure 10b), and the motions rely on the Weber number and impact eccentricity distance.…”

Section: Phenomena Mechanisms and Regulations Of Droplet Impactmentioning

confidence: 99%

See 3 more Smart Citations

Understanding and Utilizing Droplet Impact on Superhydrophobic Surfaces: Phenomena, Mechanisms, Regulations, Applications, and Beyond

Hu,

Chu,

Shan

et al. 2023

Advanced Materials

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Droplet impact is a ubiquitous liquid behavior that closely tied to human life and production, making indispensable impacts on the big world. Nature‐inspired superhydrophobic surfaces provide a powerful platform for regulating droplet impact dynamics. The collision between classic phenomena of droplet impact and the advanced manufacture of superhydrophobic surfaces is lighting up the future. Accurately understanding, predicting, and tailoring droplet dynamic behaviors on superhydrophobic surfaces are progressive steps to integrate the droplet impact into versatile applications and further improve the efficiency. In this review, the progress on phenomena, mechanisms, regulations, and applications of droplet impact on superhydrophobic surfaces, bridging the gap between droplet impact, superhydrophobic surfaces, and engineering applications are comprehensively summarized. It is highlighted that droplet contact and rebound are two focal points, and their fundamentals and dynamic regulations on elaborately designed superhydrophobic surfaces are discussed in detail. For the first time, diverse applications are classified into four categories according to the requirements for droplet contact and rebound. The remaining challenges are also pointed out and future directions to trigger subsequent research on droplet impact from both scientific and applied perspectives are outlined. The review is expected to provide a general framework for understanding and utilizing droplet impact.

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Section: Droplet Reboundmentioning

confidence: 99%

Section: Brief Summary Of Abilities Of Superhydrophobic Surfacesmentioning

confidence: 99%

Section: Phenomena Mechanisms and Regulations Of Droplet Impactmentioning

confidence: 99%

Section: Phenomena Mechanisms and Regulations Of Droplet Impactmentioning

confidence: 99%

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Understanding and Utilizing Droplet Impact on Superhydrophobic Surfaces: Phenomena, Mechanisms, Regulations, Applications, and Beyond

Hu,

Chu,

Shan

et al. 2023

Advanced Materials

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“…The impact of droplets on solid surfaces is a common hydrodynamic phenomenon that contains complex hydrodynamic mechanisms. − Upon the impacting, the droplet may exhibit diverse outcomes, including deposition, splashing, bouncing, crushing, etc., − depending on the droplet parameters (i.e., diameter, velocity, and shape), − fluid properties (i.e., viscosity, surface tension, and density), − surface wettability, − and micro/macrostructures. − In recent decades, learning from the lotus effect, − many superhydrophobic surfaces (water contact angle exceeds 150°) have been fabricated and expected to be applied in various fields. − Owing to its high repellency to water, the superhydrophobic surface shows prospective advantages for the protection of microfliers in rainy weather.…”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic Strategy for Nature-Inspired Rotating Microfliers: Enhancing Spreading, Reducing Contact Time, and Weakening Impact Force of Raindrops

Shu

Chu

et al. 2022

ACS Appl. Mater. Interfaces

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Wind-dispersal of seeds is a remarkable strategy in nature, enlightening the construction of microfliers for environmental monitoring. However, the flight of these microfliers is greatly affected by climatic conditions, especially in rainy days, they suffer serious raindrop impact. Here, a hierarchical superhydrophobic surface is fabricated and a novel strategy is demonstrated that the superhydrophobic coating can enhance spreading while reduce contact time and impact force of raindrops, all of which are beneficial for the rotating microfliers. When the surface rotating speed exceeds a critical value, the effect of centrifugal force becomes considerable so that the droplet spreading is enhanced. The rotating superhydrophobic surface can rotate an impacting droplet by the tangential drag force from the air boundary layer, and the rotation of the droplet generates a negative pressure zone inside it, reducing the contact time by more than 30%. The impact force by the droplet on the rotating superhydrophobic surface also has a remarkable reduction of 53% compared to that on unprocessed hydrophilic surfaces, which helps maintain the flight stability of the microfliers. This work pioneers in revealing the droplet impact effect on rotating microflier surfaces and demonstrates the effectiveness of protecting microfliers with superhydrophobic coatings, which shall guide the manufacture and flight of microfliers in rainy conditions.

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Efficient Photothermal Anti‐/Deicing Enabled by 3D Cu_2‐xS Encapsulated Phase Change Materials Mixed Superhydrophobic Coatings

Hou,

Jiang,

Sun

et al. 2023

Advanced Materials

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Photothermal superhydrophobic surfaces are one of the most promising anti‐/deicing materials, yet they are limited by the low energy density and intermittent nature of solar energy. Here, a coupling solution based on microencapsulated phase change materials (MPCMs) that integrates photothermal effect and phase change thermal storage is proposed. Dual‐shell octahedral MPCMs with Cu2O as the first layer and 3D Cu2‐xS as the second layer for the first time is designed. By morphology and phase manipulation of the Cu2‐xS shell, the local surface plasmonic heating modulation of MPCMs is realized, and the MPCM reveals full‐spectrum high absorption with a photothermal conversion efficiency up to 96.1%. The phase change temperature and enthalpy remain in good consistency after 200 cycles. Multifunctional photothermal phase‐change superhydrophobic composite coatings are fabricated by combining the hydrolyzed and polycondensation products of octadecyl trichlorosilane and the dual‐shell MPCM. The multifunctional coatings exhibit excellent anti‐/deicing performance under low temperature and high humidity conditions. This work not only provides a new approach for the design of high‐performance MPCMs but also opens up an avenue for the anti‐icing application of photothermal phase‐change superhydrophobic composite coatings.

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Bidirectional Transport of Split Droplets

Cited by 20 publications

References 53 publications

Understanding and Utilizing Droplet Impact on Superhydrophobic Surfaces: Phenomena, Mechanisms, Regulations, Applications, and Beyond

Understanding and Utilizing Droplet Impact on Superhydrophobic Surfaces: Phenomena, Mechanisms, Regulations, Applications, and Beyond

Superhydrophobic Strategy for Nature-Inspired Rotating Microfliers: Enhancing Spreading, Reducing Contact Time, and Weakening Impact Force of Raindrops

Efficient Photothermal Anti‐/Deicing Enabled by 3D Cu_2‐xS Encapsulated Phase Change Materials Mixed Superhydrophobic Coatings

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Bidirectional Transport of Split Droplets

Cited by 20 publications

References 53 publications

Understanding and Utilizing Droplet Impact on Superhydrophobic Surfaces: Phenomena, Mechanisms, Regulations, Applications, and Beyond

Understanding and Utilizing Droplet Impact on Superhydrophobic Surfaces: Phenomena, Mechanisms, Regulations, Applications, and Beyond

Superhydrophobic Strategy for Nature-Inspired Rotating Microfliers: Enhancing Spreading, Reducing Contact Time, and Weakening Impact Force of Raindrops

Efficient Photothermal Anti‐/Deicing Enabled by 3D Cu2‐xS Encapsulated Phase Change Materials Mixed Superhydrophobic Coatings

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Product

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About

Efficient Photothermal Anti‐/Deicing Enabled by 3D Cu_2‐xS Encapsulated Phase Change Materials Mixed Superhydrophobic Coatings