Impact and wetting behaviors of impinging microdroplets on superhydrophobic textured surfaces

Kwon, Dong-Hee; Lee, Sang Joon

doi:10.1063/1.4705296

Cited by 82 publications

(21 citation statements)

References 21 publications

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“…For all surfaces the advancing angle is around 160° and the difference in hysteresis originates only from the receding angle. This is in agreement with previous findings for drops in the Cassie Baxter state rolling off the surface [13,14].. To optimize the geometry for increased water repellency one normally decreases the surface coverage of structures in contact with the water at the cost of decreasing the stability of the Cassie Baxter state [15]. For the random multi-height structures, we see that this in addition seems to lead to an increased hysteresis.…”

Section: Resultssupporting

confidence: 82%

Multi-height structures in injection molded polymer

Andersen

Taboryski

2015

Microelectronic Engineering

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We present the fabrication process for injection molded multi-height surface structures for studies of wetting behavior. We adapt the design of super hydrophobic structures to the fabrication constrictions imposed by industrial injection molding. This is important since many super hydrophobic surfaces are challenging to realize by injection molding due to overhanging structures and very high aspect ratios. In the fabrication process, we introduce several unconventional steps for producing the desired shapes, using a completely random mask pattern, exploiting the diffusion limited growth rates of different geometries, and electroforming a nickel mold from a polymer foil. The injection-molded samples are characterized by contact angle hysteresis obtained by the tilting method. We find that the receding contact angle depends on the surface coverage of the random surface structure, while the advancing contact angle is practically independent of the structure. Moreover, we argue that the increase in contact angle hysteresis correlates with the concentration of pinning sites among the random surface structures.

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Section: Resultssupporting

confidence: 82%

Multi-height structures in injection molded polymer

Andersen

Taboryski

2015

Microelectronic Engineering

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“…Different from the Bartolo et al's work, researchers found that the calculated antiwetting capillary pressure ( P C ) far exceeded the value of calculated dynamic pressure ( P D ) by Equations and , which cannot explain the wetting transition . The significant role of water hammer pressure ( P WH ) was then demonstrated in the transition to the Wenzel state . The water hammer pressure ( P WH , in Equation ) was explained by the one needed to produce a radius R WH (Equation ) at the contact area:

P_{WH} = k ρ V C

R_{WH} = \frac{R_{0} V}{C}

where k stands for a constant determined by the type of impacting surface, shape, and velocity of the droplet, C for the speed of sound, and R 0 for the initial droplet radius.…”

Section: The Mechanisms Of Anti‐icing and Icephobicitymentioning

confidence: 85%

“…Irreversible transition between Cassie and Wenzel will bring the loss of the antiadhesive performances related with superhydrophobicity, and have an adverse effect on the anti‐icing property . However, the mechanism of Cassie–Wenzel transition is still in a heated discussion.…”

Section: The Mechanisms Of Anti‐icing and Icephobicitymentioning

confidence: 99%

“…With the presence of the water hammer pressure ( P WH ), Deng et al clearly defined three wetting states for the impinging droplet, that is total wetting state ( P WH > P D > P C ), partial wetting state ( P WH > P C > P D ), and total nonwetting state ( P C > P WH > P D ), as shown in Figure C . In summary, the transition from the Cassie regime to the Wenzel regime depends on the integration between impact velocity, geometric parameter, materials, and liquid properties …”

Section: The Mechanisms Of Anti‐icing and Icephobicitymentioning

confidence: 99%

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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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267

121

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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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“…However, a transition between the Cassie-Baxter state and the Wenzel state can easily occur for several reasons, including droplet evaporation [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Controlling the Cassie-to-Wenzel Transition: an Easy Route towards the Realization of Tridimensional Arrays of Biological Objects

et al. 2014

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Abstract:In this paper we provide evidence that the Cassie-to-Wenzel transition, despite its detrimental effects on the wetting properties of superhydrophobic surfaces, can be exploited as an effective micro-fabrication strategy to obtain highly ordered arrays of biological objects. To this purpose we fabricated a patterned surface wetted in the Cassie state, where we deposited a droplet containing genomic DNA. We observed that, when the droplet wets the surface in the Cassie state, an array of DNA filaments pinned on the top edges between pillars is formed. Conversely, when the Cassie-to-Wenzel transition occurs, DNA can be pinned at different height between pillars. These results open the way to the realization of tridimensional arrays of biological objects.

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Impact and wetting behaviors of impinging microdroplets on superhydrophobic textured surfaces

Cited by 82 publications

References 21 publications

Multi-height structures in injection molded polymer

Multi-height structures in injection molded polymer

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

Controlling the Cassie-to-Wenzel Transition: an Easy Route towards the Realization of Tridimensional Arrays of Biological Objects

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