Superhydrophobic Coatings: The <i>Salvinia</i> Paradox: Superhydrophobic Surfaces with Hydrophilic Pins for Air Retention Under Water (Adv. Mater. 21/2010)

Barthlott, Wilhelm; Schimmel, Thomas; Wiersch, Sabine; Koch, Kerstin; Brede, M.; Barczewski, M.; Walheim, Stefan; Weis, Aaron; Kaltenmaier, Anke; Leder, Alfred; Bohn, Holger Florian

doi:10.1002/adma.201090075

Cited by 4 publications

(2 citation statements)

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“…A different architecture is found on some species with hairy leaf surfaces. The water fern (some species of the genus Salvinia ) and Pistia stratioides leaves retain a relatively thick air layer between hydrophobic hairs when submersed in water [24]. This provides sufficient buoyancy to avoid long-term submerging.…”

Section: Resultsmentioning

confidence: 99%

Superhydrophobicity in perfection: the outstanding properties of the lotus leaf

Ensikat

Ditsche-Kuru²,

Neinhuis³

et al. 2011

Beilstein J. Nanotechnol.

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628

414

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SummaryLotus leaves have become an icon for superhydrophobicity and self-cleaning surfaces, and have led to the concept of the ‘Lotus effect’. Although many other plants have superhydrophobic surfaces with almost similar contact angles, the lotus shows better stability and perfection of its water repellency. Here, we compare the relevant properties such as the micro- and nano-structure, the chemical composition of the waxes and the mechanical properties of lotus with its competitors. It soon becomes obvious that the upper epidermis of the lotus leaf has developed some unrivaled optimizations. The extraordinary shape and the density of the papillae are the basis for the extremely reduced contact area between surface and water drops. The exceptional dense layer of very small epicuticular wax tubules is a result of their unique chemical composition. The mechanical robustness of the papillae and the wax tubules reduce damage and are the basis for the perfection and durability of the water repellency. A reason for the optimization, particularly of the upper side of the lotus leaf, can be deduced from the fact that the stomata are located in the upper epidermis. Here, the impact of rain and contamination is higher than on the lower epidermis. The lotus plant has successfully developed an excellent protection for this delicate epistomatic surface of its leaves.

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Section: Resultsmentioning

confidence: 99%

Superhydrophobicity in perfection: the outstanding properties of the lotus leaf

Ensikat

Ditsche-Kuru²,

Neinhuis³

et al. 2011

Beilstein J. Nanotechnol.

Self Cite

628

414

View full text Add to dashboard Cite

show abstract

“…Great efforts have been devoted to exploring the surface structure of animals and plants with super non-wetting properties [7-9], such as skins of Navodon septentrionalis filefish, leafhoppers, springtails, and shark [10-12]; feet of gecko and water-walking arthropods [13,14]; wings of cicada and butterfly [15,16]; eyes of moth and fly [17]; surfaces of lotus leaf, Salvinia molesta, and rose, etc. [18-20] Subsequently, many artificial superhydrophobic surfaces with similar structures were manufactured [21-23]. However, fabricating superoleophobic surfaces is still a challenge because it requires lower surface energy and stricter microstructures than superhydrophobic surfaces [24-26].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and self-cleaning properties of superamphiphobic coatings based on burr-like copolymer particles

Zhao

Duan

2022

Surface Engineering

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Superhydrophobic and superoleophobic surfaces are widely used in many fields. Inspired by the structure of water strider legs, we proposed a simple method to construct a superamphiphobic surface based on burr-like KH-PS (copolymer of styrene and γ-Methacryloxypropyl trimethoxy silane) nanoparticles by soap-free emulsion polymerization and hydrolytic condensation reaction. In order to improve the film-forming properties and adhesion between coating and substrate, fluoromonomer-containing polysiloxane acrylate (PA) is designed and synthesized to bond burr-like nanoparticles. Then modify the fluorinecontaining material on the surface of the burr-like particles to reduce the surface energy. The contact angles of the coating to water, diiodomethane, hexadecane, soybean oil, and rapeseed oil are 164.2°± 1.5°, 155.3°± 1.7°, 148.6°± 1.9°, 152.7°± 1.6°, and 153.5°± 1.7°, respectively. The superamphiphobic coating exhibits excellent thermal stability, chemical stability, and self-cleaning performance. The microscopic roughness of coating constructed by organic polymer particles has broader application prospects on soft substrates such as fabrics.

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Microstructure and Wettability on the Elytral Surface of Aquatic Beetle

Sun

Liang

Watson

et al. 2013

AMM

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The microstructures on elytral surface of aquatic beetles belonging to Hydrophilidae and Dytiscidae were observed under an environment scanning microscope, and the wettabilities were determined with an optical contact angle meter. The results show the elytral surfaces are relatively smooth compared to the structures of other insects such as the butterfly wing scales or cicada wing protrusions. They exhibit a polygonal structuring with grooves and pores being the main constituent units. The contact angles (CAs) range from 47.1oto 82.1o. The advancing and receding angles were measured by injecting into and withdrawing a small amount of water on the most hydrophilic (with a contact angle of 47.1o) and hydrophobic (with a contact angle of 82.1o) elytral surfaces, which illustrates the vital role of three-phase contact line (TCL) in the wetting mechanism of aquatic beetle elytral surfaces.

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Superhydrophobic Coatings: The Salvinia Paradox: Superhydrophobic Surfaces with Hydrophilic Pins for Air Retention Under Water (Adv. Mater. 21/2010)

Cited by 4 publications

References 0 publications

Superhydrophobicity in perfection: the outstanding properties of the lotus leaf

Superhydrophobicity in perfection: the outstanding properties of the lotus leaf

Synthesis and self-cleaning properties of superamphiphobic coatings based on burr-like copolymer particles

Microstructure and Wettability on the Elytral Surface of Aquatic Beetle

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