Large Contact Angles of Plant and Animal Surfaces

Cassie, A. B. D.; Baxter, S.

doi:10.1038/155021a0

Cited by 251 publications

(159 citation statements)

References 2 publications

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“…The Cassie-Baxter state describes a liquid which is resting partly on the features of a solid material and bridging air between these features [32,33]. The relation between the apparent contact angle θc and the equilibrium angle θe is described as:…”

Section: Resultsmentioning

confidence: 99%

Superhydrophobic Surfaces Created by Elastic Instability of PDMS

2016

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Lotus flowers, rose petals, some plant leaves and insects have a naturally super-hydrophobic surface. In fact, the surface of a Lotus leaf is covered by micro and nano structures mixed with wax, which makes its surface superhydrophobic. In microfluidics, superhydrophobicity is an important factor in the rheometers on a chip. It is also sought in other complex fluids applications like the self-cleaning and the antibacterial materials. The wettability of the surface of solid support can be modified by altering its chemical composition. This means functionalizing the interface molecules to different chemical properties, and/or forming a thin film on the surface. We can also influence its texturing by changing its roughness. Despite considerable efforts during the last decade, superhydrophobic surfaces usually involve, among others, microfabrication processes, such as photolithography technique. In this study, we propose an original and simple method to create superhydrophobic surfaces by controlling elastic instability of poly-dimethylsiloxane (PDMS) films. Indeed, we demonstrate that the self-organization of wrinkles on top of non-wettable polymer surfaces leads to surperhydrophobic surfaces with contact angles exceeding 150˝. We studied the transition Wenzel-Cassie, which indicated that the passage of morphology drops "impaled" to a type of morphology "fakir" were the strongest topographies.

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Section: Resultsmentioning

confidence: 99%

Superhydrophobic Surfaces Created by Elastic Instability of PDMS

2016

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“…The concept put forth by Cassie and Baxter explained the large contact angles observed in many plant and animal surfaces, such as the lotus leaf. 33 In addition to the surface area concept model proposed by Cassie and Baxter, recent experimental and theoretical studies have highlighted the importance of the three-phase contact lines at the edges of the surface protrusions to macroscopic wettability. 34 -38 In particular, the interactions of the liquid contact line with the surface protrusions become important (i.e., pinning) when the liquids are in motion on these structured surfaces.…”

Section: Wetting On Structured Surfacesmentioning

confidence: 99%

Interfacial materials with special wettability

et al. 2013

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“…In the Wenzel state water penetrates the texture completely, 2 but in the Cassie state air is trapped by texture, so that liquid sits on the top of the asperities. 3 In most applications (microfluidics, "self-cleaning", water-repellent materials, bio-medical devices) the Cassie state is desired, which, however, could be unstable or metastable, so that irreversible transitions towards the more stable Wenzel state can be provoked. [4][5][6][7] During the last decade, much insight has been gained into the relative stability of the Cassie state, the Cassieto-Wenzel wetting transition.…”

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Regimes of wetting transitions on superhydrophobic textures conditioned by energy of receding contact lines

Dubov

Mourran

Möller

et al. 2015

Applied Physics Letters

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We discuss an evaporation-induced wetting transition on superhydrophobic stripes, and show that depending on the elastic energy of the deformed contact line, which determines the value of an instantaneous apparent contact angle, two different scenarios occur. For relatively dilute stripes the receding angle is above 90 • , and the sudden impalement transition happens due to an increase of a curvature of an evaporating drop. For dense stripes the slow impregnation transition commences when the apparent angle reaches 90 • and represents the impregnation of the grooves from the triple contact line towards the drop center.

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Large Contact Angles of Plant and Animal Surfaces

Cited by 251 publications

References 2 publications

Superhydrophobic Surfaces Created by Elastic Instability of PDMS

Superhydrophobic Surfaces Created by Elastic Instability of PDMS

Interfacial materials with special wettability

Regimes of wetting transitions on superhydrophobic textures conditioned by energy of receding contact lines

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