Guided Self‐Propelled Leaping of Droplets on a Micro‐Anisotropic Superhydrophobic Surface

Liu, Jie; Guo, Hao; Zhang, Bo; Qiao, Shasha; Shao, Mingzhe; Zhang, Xuehua; Feng, Xi‐Qiao; Li, Qunyang; Song, Yanlin; Jiang, Lei; Wang, Jianjun

doi:10.1002/ange.201600224

Cited by 41 publications

(27 citation statements)

References 32 publications

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“…37,114,115 Compared with plain hydrophobic surfaces, micro/ nanostructured superhydrophobic surfaces can enable coalescence-induced droplet jumping due to the release of excess surface energy when two or more droplets merge into one. 66,[116][117][118][119][120] At small surface subcooling, typically less than one to a few K, such self-propelled droplet removal can significantly improve heat transfer efficiency in comparison with conventional dropwise condensation on plain hydrophobic surfaces (Figure 2B), which is attributed to more frequent surface refreshing. 44,78,121 However, as surface subcooling increases, the Cassie state of droplets (Figure 1H) that are easier to be removed can change to the highly pinned Wenzel state (Figure 1I), resulting in the flooding phenomenon (with a large droplet departure diameter over 4 mm) and thus greatly degrading the heat transfer efficiency of micro/nanostructured superhydrophobic surfaces.…”

Section: Context and Scalementioning

confidence: 99%

Liquid-Vapor Phase-Change Heat Transfer on Functionalized Nanowired Surfaces and Beyond

Wen

Lee

et al. 2018

Joule

192

101

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Liquid-vapor phase-change processes have been widely exploited in industrial applications including power generation, water processing and harvesting, cooling/refrigeration and environmental control, and thermal management. Enhancing liquid-vapor phase-change heat transfer is of practical interest. Recent advances in micro/nano-fabrication and characterization techniques have not only enabled exciting heat transfer enhancements but also furthered the fundamental understanding of the liquid-vapor phase-change processes. Nanowires can be synthesized with precise control for producing diverse and desired surface morphology with tunable wettability. This review presents an overview of liquid-vapor phase-change heat transfer enhancement on functionalized nanowired surfaces, as well as other promising strategies and surfaces. In this review, we briefly summarize the fabrication techniques for functionalized nanowired surfaces, discuss the underlying mechanisms for boiling and condensation enhancement, and introduce some important works to illustrate the power of design for functionality. We conclude this review by providing the perspectives for future research directions.

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Section: Context and Scalementioning

confidence: 99%

Liquid-Vapor Phase-Change Heat Transfer on Functionalized Nanowired Surfaces and Beyond

Wen

Lee

et al. 2018

Joule

192

101

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“…Droplet impact on solid surfaces has been extensively investigated owing to its significance in various fields such as hydroelectric power collection 1-4 , inkjet printing [5][6][7][8] , and anti-icing [9][10][11][12][13][14][15][16] .…”

Section: Main Text Introductionmentioning

confidence: 99%

Breaking the symmetry: Suppressing Plateau-Rayleigh instability and optimizing hydropower utilization

Zhao¹,

Liu

et al. 2021

Preprint

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Droplet impact on solid surfaces is essential for natural and industrial processes. Particularly, controlling the instability after droplet impact, and avoiding the satellite drops generation, have aroused great interest for its significance in inkjet printing, pesticide spraying, and hydroelectric power collection. Herein, we found that breaking the symmetry of the droplet impact dynamics using patterned-wettability surfaces can suppress the Plateau-Rayleigh instability during the droplet rebounding and improve the energy collection efficiency. Systematic experimental investigation, together with mechanical modeling and numerical simulation, revealed that the asymmetric wettability patterns can regulate the internal liquid flow and reduce the vertical velocity gradient inside the droplet, thus suppressing the instability during droplet rebounding and eliminating the satellite drops. Accordingly, the droplet energy utilization was promoted, as demonstrated by the improved hydroelectric power generation efficiency by 36.5%. These findings deepen the understanding of the wettability-induced asymmetrical droplet dynamics during the liquid-solid interactions, and facilitate related applications such as hydroelectric power generation and materials transportation.

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“…Tremendous investigations have shown that SHSs with specially designed structures can retain superhydrophobicity to condensed water droplets, and coalesced droplets can be spontaneously removed from the surface via self-propelled jumping (18)(19)(20). The self-propelled jumping of condensed droplets is driven by the released surface energy during droplet coalescence after overcoming solid-liquid adhesion (21)(22)(23)(24)(25). However, these surfaces inevitably lose their water repellency at low temperatures (i.e., < −15 °C) because of freezing (9,21,26).…”

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confidence: 99%

Solar anti-icing surface with enhanced condensate self-removing at extreme environmental conditions

Zhang

Zhao

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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The inhibition of condensation freezing under extreme conditions (i.e., ultra-low temperature and high humidity) remains a daunting challenge in the field of anti-icing. As water vapor easily condensates or desublimates and melted water refreezes instantly, these cause significant performance decrease of most anti-icing surfaces at such extreme conditions. Herein, inspired by wheat leaves, an effective condensate self-removing solar anti-icing/frosting surface (CR-SAS) is fabricated using ultrafast pulsed laser deposition technology, which exhibits synergistic effects of enhanced condensate self-removal and efficient solar anti-icing. The superblack CR-SAS displays superior anti-reflection and photothermal conversion performance, benefiting from the light trapping effect in the micro/nano hierarchical structures and the thermoplasmonic effect of the iron oxide nanoparticles. Meanwhile, the CR-SAS displays superhydrophobicity to condensed water, which can be instantly shed off from the surface before freezing through self-propelled droplet jumping, thus leading to a continuously refreshed dry area available for sunlight absorption and photothermal conversion. Under one-sun illumination, the CR-SAS can be maintained ice free even under an ambient environment of −50 °C ultra-low temperature and extremely high humidity (ice supersaturation degree of ∼260). The excellent environmental versatility, mechanical durability, and material adaptability make CR-SAS a promising anti-icing candidate for broad practical applications even in harsh environments.

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Guided Self‐Propelled Leaping of Droplets on a Micro‐Anisotropic Superhydrophobic Surface

Cited by 41 publications

References 32 publications

Liquid-Vapor Phase-Change Heat Transfer on Functionalized Nanowired Surfaces and Beyond

Liquid-Vapor Phase-Change Heat Transfer on Functionalized Nanowired Surfaces and Beyond

Breaking the symmetry: Suppressing Plateau-Rayleigh instability and optimizing hydropower utilization

Solar anti-icing surface with enhanced condensate self-removing at extreme environmental conditions

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