Relationship between Wetting Hysteresis and Contact Time of a Bouncing Droplet on Hydrophobic Surfaces

Shen, Yizhou; Tao, Jie; Tao, Haijun; Chen, Shanlong; Pan, Lei; Wang, Tao

doi:10.1021/acsami.5b06754

Cited by 72 publications

(54 citation statements)

References 43 publications

(57 reference statements)

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“…In the range of Weber number considered, our results reveal that the drops bounce off the SLIPS even at relatively low We numbers. These results are specific to SLIPS since it is known that water drops do not bounce on surfaces with receding contact angles higher than 100 o as shown by Antonini et al [34,35,36]. Our measurements show that the receding angle for the non-infused surface, θ r = 95 o , does not satisfy this criterion and therefore it explains why the drop does not bounce on such surface.…”

Section: Contact Time Between the Drop And The Surfacesupporting

confidence: 51%

Drop impact dynamics on slippery liquid-infused porous surfaces: influence of oil thickness

et al. 2018

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Slippery liquid-infused porous surfaces (SLIPS) are porous nanostructures impregnated with a low surface tension lubricant. They have recently shown great promise in various applications that require non-wettable superhydrophobic surfaces. In this paper, we investigate experimentally the influence of the oil thickness on the wetting properties and drop impact dynamics of new SLIPS. By tuning the thickness of the oil layer deposited through spin-coating, we show that a sufficiently thick layer of oil is necessary to avoid dewetting spots on the porous nanostructure and thus increasing the homogeneity of the liquid distribution. Drop impact on these surfaces is investigated with a particular emphasis on the spreading and rebound dynamics when varying the oil thickness and the Weber number.

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Section: Contact Time Between the Drop And The Surfacesupporting

confidence: 51%

Drop impact dynamics on slippery liquid-infused porous surfaces: influence of oil thickness

et al. 2018

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“…Therefore, how to reduce the contact time is significant to anti‐icing, as some researchers found that wetting hysteresis and the solid fraction play significant roles in determining the duration between impacting and bouncing off the substrate . Bird et al used SHS with a morphology to redistribute the liquid mass and reduce the contact time .…”

Section: The Mechanisms Of Anti‐icing and Icephobicitymentioning

confidence: 99%

“…Therefore, how to reduce the contact time is significant to anti-icing, as some researchers found that wetting hysteresis and the solid fraction play significant roles in determining the duration between impacting and bouncing off the substrate. [121,122] [115] Copyright 2002, Nature Publishing Group. B) The impact processes of water droplets on superhydrophobic surfaces with different macrotextures captured by a high-speed camera.…”

Section: Drop Bouncing Mechanismmentioning

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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“…According to the mature Cassie–Baxter wetting theory, the quantity of entrapped air pockets by the surface textures determines the superhydrophobicity, i.e., the APCA and CAH. However, the both wetting parameters are also associated with the work done W against the moving of droplet on solid surface, which can be described by

W \propto \frac{\cos θ_{normalR} - \cos θ_{normalA}}{1 - \cos θ^{*}}

where θ* is the APCA, and θ A and θ R are the advancing contact angle (ACA) and receding contact angle (RCA), respectively, also the difference between θ A and θ R determines CAH. As is well known, the work done W reflects the capacity of impact droplets rebounding off the surface.…”

Section: Resultsmentioning

confidence: 99%

Anti‐Icing Performance of Superhydrophobic Texture Surfaces Depending on Reference Environments

Shen

Wang

Tao

et al. 2017

Adv Materials Inter

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mightily appeal to many researchers to develop an anti-icing method without energy consumption by mimicking the plant surface topographies. [1][2][3][4][5][6] As well known, the famous Lotus Effect is widely used and induces to construct the hierarchical topography of composite micronanostructures in favor of entrapping more air pockets to repel water and finally realize the aim of preventing ice accumulation. [7][8][9][10][11] Also, many theoretical and experimental studies have been reported that the trapped air pockets play a thermal insulation role in preventing the freezing of supercooled water, and cause a remarkable reduction in solid/liquid contact area. [8,9,12,13] The resultant situation is that triggering ice nucleation gets more difficulty due to the increasing energy barrier, finally showing a certain extent of icingdelay performance. [14,15] Furthermore, the air pockets can be remained after freezing and serve as the original microcracks to reduce the ice adhesion strength, resulting in the adhered ice being extremely easily removed. [16][17][18] After a comprehensive insight into these reported literatures, the real anti-icing potential of hierarchical micro-nanostructure superhydrophobic surface needs to be further confirmed in the involved application environments due to the obvious distinction (several orders of magnitude) of the volume of reference supercooled droplets.We, therefore, made great efforts to verify the anti-icing capacity of hierarchical micro-nanostructure surfaces through modeling the application environments, not only the routine analyses in laboratory. Here, this work developed both routes to fabricate the superhydrophobic structure surfaces (see Figure 1a), hierarchical micro-nanostructure and single nanostructure surfaces, which were also labeled as hierarchical micronanostructure surface (HN-Surface) and single nanostructure surface (SN-Surface), respectively. The more detailed operating procedures are provided in Experimental Section. According to the previous experience and classical wetting theory, the HN-Surface is expected to entrap more air pockets underneath the droplets and exhibit more robust water repellence than the SN-Surface. [17,19,20] Also, the anti-icing performance should display the similar situation. The supercooled droplets on HN-Surface will take more time to complete the freezing process, and the produced ice can be easily removed under the action of slight external force due to the lower ice adhesion.Materials decorated by the hierarchical micro-nanostructures similar to lotus leaf surface topographies are firmly considered to possess the substantial anti-icing functions, showing icing-delay and low ice adhesion. Here, the aim of this work is to verify the anti-icing capacity in the actual icing environment containing supercooled airflow. This study, therefore, develops both routes to fabricate the hierarchical micro-nanostructure and single nanostructure superhydrophobic surfaces, and first evaluates their anti-icing capacity based on the routine mea...

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Relationship between Wetting Hysteresis and Contact Time of a Bouncing Droplet on Hydrophobic Surfaces

Cited by 72 publications

References 43 publications

Drop impact dynamics on slippery liquid-infused porous surfaces: influence of oil thickness

Drop impact dynamics on slippery liquid-infused porous surfaces: influence of oil thickness

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

Anti‐Icing Performance of Superhydrophobic Texture Surfaces Depending on Reference Environments

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