Hydrodynamics-dominated wetting phenomena on hybrid superhydrophobic surfaces

Azimi, Arash; Rohrs, Chae; He, Ping

doi:10.1016/j.jcis.2019.11.099

Cited by 11 publications

(2 citation statements)

References 37 publications

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“…The concept of a local minimum has had a huge impact on the scientific community. (See, for example, refs and . )…”

Section: Why Do Drops Pin?mentioning

confidence: 99%

Open Problems in Wetting Phenomena: Pinning Retention Forces

Tadmor

2021

Langmuir

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We review existing explanations for drop pinning and the origin of the force required to initiate the sliding of a drop on a solid surface (depinning). Theories that describe these phenomena include de Gennes', Marmur's, Furmidge's, the related Furmidge−Extrand's, and Tadmor's theory. These theories are all well cited but generally do not address each other, and usually papers that cite one of them ignore the others. Here, we discuss the advantages and disadvantages of these theories and their applicability to different experimental systems. Thus, we link different experimental systems to the theories that describe them best. We describe the force laws that can be deduced should these theories be united and the major open problems that remain. We describe a physical meaning that can be extracted from retention force measurements, specifically, the interfacial modulus that describes the tendency of a solid to conform to the liquid. This has implications for various wetting phenomena such as adhesion robustness, drug penetration into biological tissues, and solid robustness/resilience versus solid degradation over time as a result of its contact with a liquid.

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“…The concept of a local minimum has had a huge impact on the scientific community. (See, for example, refs and . )…”

Section: Why Do Drops Pin?mentioning

confidence: 99%

Open Problems in Wetting Phenomena: Pinning Retention Forces

Tadmor

2021

Langmuir

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“…If the contact line is divided into much smaller lines, viz., the second level of hierarchy, the related contact angle θ 2 r is distinctively different from θ 1 r of the first level of hierarchy as shown in Figure 5c. These phenomena will be kept on until a homogeneous wetting interface achieved when reaching a level n. Consequently, the contact angle either increases or decreases by adding multiple length scales of roughness at all smaller levels depending on the pinned fraction of each level of hierarchy, which is critical for designing surfaces with various adhesion [28][29][30][31][32][33].…”

Section: Cassie-baxter Modelmentioning

confidence: 99%

Wettability on Different Surfaces

Kwok¹

2020

21st Century Surface Science - A Handbook

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Wettability has been explored for 100 years since it is described by Young’s equation in 1805. It is all known that hydrophilicity means contact angle (θ), θ < 90°; hydrophobicity means contact angle (θ), θ > 90°. The utilization of both hydrophilic surfaces and hydrophobic surfaces has also been achieved in both academic and practical perspectives. In order to understand the wettability of a droplet distributed on the textured surfaces, the relevant models are reviewed along with understanding the formation of contact angle and how it is affected by the roughness of the textured surface aiming to obtain the required surface without considering whether the original material is hydrophilic or hydrophobic.

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Recent progress in experiments for sessile droplet wetting on structured surfaces

Ren

Duan

2021

Current Opinion in Colloid & Interface Science

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Hydrodynamics-dominated wetting phenomena on hybrid superhydrophobic surfaces

Cited by 11 publications

References 37 publications

Open Problems in Wetting Phenomena: Pinning Retention Forces

Open Problems in Wetting Phenomena: Pinning Retention Forces

Wettability on Different Surfaces

Recent progress in experiments for sessile droplet wetting on structured surfaces

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