Simulation of meniscus stability in superhydrophobic granular surfaces under hydrostatic pressures

Emami, Babak; Bucher, T.M.; Tafreshi, H. Vahedi; Pestov, Dmitry; Gad‐el‐Hak, Mohamed; Tepper, Gary

doi:10.1016/j.colsurfa.2011.05.055

Cited by 43 publications

(27 citation statements)

References 32 publications

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“…Emami et al [59] conducted a similar study in 3-D space. In particular, they simulated the stability of air-water interface formed on granular superhydrophobic coatings comprised of randomly distributed spherical aerogel particles in comparison to the ordered distributed ones.…”

Section: Air-water Meniscus Stability Under Hydrostatic Pressurementioning

confidence: 87%

“…Recent studies, however, have shown that there are alternative methods for engineering affordable superhydrophobic surfaces. One can produce a superhydrophobic surface by randomly depositing hydrophobic aerogel particles on a substrate [59][60][61]. Samaha et al [62] prepared aerogel superhydrophobic surfaces with different particle sizes.…”

Section: Engineered Cost-effective Surfacesmentioning

confidence: 99%

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Polymeric Slippery Coatings: Nature and Applications

Samaha

Gad‐el‐Hak

2014

Polymers

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Abstract:We review recent developments in nature-inspired superhydrophobic and omniphobic surfaces. Water droplets beading on a surface at significantly high static contact angles and low contact-angle hystereses characterize superhydrophobicity. Microscopically, rough hydrophobic surfaces could entrap air in their pores resulting in a portion of a submerged surface with air-water interface, which is responsible for the slip effect. Suberhydrophobicity enhances the mobility of droplets on lotus leaves for self-cleaning purposes, so-called lotus effect. Amongst other applications, superhydrophobicity could be used to design slippery surfaces with minimal skin-friction drag for energy conservation. Another kind of slippery coatings is the recently invented slippery liquid-infused porous surfaces (SLIPS), which are one type of omniphobic surfaces. Certain plants such as the carnivorous Nepenthes pitcher inspired SLIPS. Their interior surfaces have microstructural roughness, which can lock in place an infused lubricating liquid. The lubricant is then utilized as a repellent surface for other liquids such as water, blood, crude oil, and alcohol. In this review, we discuss the concepts of both lotus effect and Nepenthes slippery mechanism. We then present a review of recent advances in manufacturing polymeric and non-polymeric slippery surfaces with ordered and disordered micro/nanostructures. Furthermore, we discuss the performance and longevity of such surfaces. Techniques used to characterize the surfaces are also detailed. We conclude the article with an overview of the latest advances in characterizing and using slippery surfaces for different applications.

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Section: Air-water Meniscus Stability Under Hydrostatic Pressurementioning

confidence: 87%

Section: Engineered Cost-effective Surfacesmentioning

confidence: 99%

Polymeric Slippery Coatings: Nature and Applications

Samaha

Gad‐el‐Hak

2014

Polymers

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“…The change in ª min with P* for a range of A* SL is shown in Figures 3 and 4 for square and hexagonal packing arrangements, respectively. The range of A* SL values used is similar to that used by Emami et al 5 There is a clear linear relationship between P* and ª min , crossing the ª min axis at 90°. This is described by eq 5, where m is the gradient of the line for a given packing density (A SL *).…”

Section: 2mentioning

confidence: 61%

“…The surface's macroscale properties define the conditions under which this occurs, and their prediction will allow better design of new superhydrophobic surfaces. The shape of the LV interface surrounding the circular columns and its change with capillary pressure has been modeled by Emami et al 10 Their work has also been extended to superhydrophobic surfaces made from layers of spherical particles, 5 further highlighting the similarities between this topic and the flow through porous media.…”

Section: 2mentioning

confidence: 99%

“…Therefore, a superhydrophobic surface must make use of etched patterns 3 or deposited structures and coatings 4,5 that alter the microscale surface of the solid and change the interaction between it and the liquid/vapor (LV) interface 6 ( Figure 1A). This allows the production of surfaces with contact angles above 150°and the manufacture of materials with different wetting characteristics.…”

Section: 2mentioning

confidence: 99%

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Identifying the Transition Capillary Pressure of a Superhydrophobic Surface Containing Cylindrical Rods

2012

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Superhydrophobic surfaces use a combination of microstructural surface patterning and a naturally hydrophobic surface to attain very high contact angles (ª > 150°). The interplay between these variables affects the macroscale characteristics of the surface. This manuscript presents a method for modeling a wide range of microstructures using the Surface Evolver program and for calculating the capillary pressure required to wet various arrangements of vertical cylindrical posts.Initial research into the wetting behavior of solids and the conditions that give rise to superhydrophobicity was driven by the textile industry's desire for waterproofing its fabrics.

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Superhydrophobicity With Self‐Adaptive Water Pressure Resistance and Adhesion of Pistia Stratiotes Leaf

Shao,

Wang,

Song

et al. 2024

Advanced Materials

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Superhydrophobic surfaces are promising for optimizing amphibious aircraft by minimizing water drag and adhesion. Achieving this involves ensuring these surfaces can resist high liquid pressure caused by deep water and fluid flow. Maximizing the solid‐liquid contact area is a common strategy to improve liquid pressure resistance. However, this approach inevitably increases solid‐liquid adhesion, making it challenging to guarantee a trade‐off between the two wetting characteristics. Here, it is found that the Pistia stratiotes leaf exhibits superhydrophobicity with high water pressure resistance and low adhesion, attributed to its self‐adaptive deformable microstructure with unique re‐entrant features. Under pressure, these microstructures deform to increase the solid‐liquid contact area, thereby enhancing water pressure resistance. The re‐entrant features elevate the deformation threshold, enabling higher modulus microstructures to achieve adaptive response. This facilitates the recovery of deformed microstructures, restoring the air layer and maintaining low adhesion. Following these concepts, Pistia stratiotes leaf‐inspired surfaces are fabricated, achieving an 183% improvement in water impact resistance and an ≈80% reduction in adhesion after overpressure compared to conventional superhydrophobic surfaces. The design principles inspired by Pistia stratiotes promise significant advancements in amphibious aircraft and other trans‐media vehicles.

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Simulation of meniscus stability in superhydrophobic granular surfaces under hydrostatic pressures

Cited by 43 publications

References 32 publications

Polymeric Slippery Coatings: Nature and Applications

Polymeric Slippery Coatings: Nature and Applications

Identifying the Transition Capillary Pressure of a Superhydrophobic Surface Containing Cylindrical Rods

Superhydrophobicity With Self‐Adaptive Water Pressure Resistance and Adhesion of Pistia Stratiotes Leaf

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