Optische Geschwindigkeitsmessungen an Luft-haltenden Deckflügeln des <i>Notonecta glauca</i>

Melskotte, Jan-Erik; Brede, M.; Leder, Alfred; Mayser, Matthias; Barthlott, Wilhelm

doi:10.1524/teme.2012.0212

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…Only with the textile optimized in this way is the market-ready development of the BOA as a self-driven and sustainable method for oil removal possible. This makes it possible to implement the Salvinia effect in a completely new application, as previous implementations have essentially been limited to air retention [36][37][38][39][40][41]. Furthermore, in this paper, we can demonstrate how liquid transport in spacer textiles can be modelled, calculated, and analyzed.…”

Section: Discussionmentioning

confidence: 99%

“…The textile differs from various other bionic implementations of Salvinia molesta [36][37][38][39][40][41], as the aim was not exclusively to transfer the superhydrophobicity, but to implement an additional function, which is oil transport. For this reason, the distinctive eggbeater-like heads seen in Salvinia molesta were also not abstracted and transferred.…”

Section: Discussion Of the Biomimetic Processmentioning

confidence: 99%

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Bio-Inspired Textiles for Self-Driven Oil–Water Separation—A Simulative Analysis of Fluid Transport

Beek,

Skirde,

Akdere

et al. 2024

Biomimetics

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In addition to water repellency, superhydrophobic leaves of plants such as Salvinia molesta adsorb oil and separate it from water surfaces. This phenomenon has been the inspiration for a new method of oil–water separation, the bionic oil adsorber (BOA). In this paper, we show how the biological effect can be abstracted and transferred to technical textiles, in this case knitted spacer textiles hydrophobized with a layered silicate, oriented at the biology push approach. Subsequently, the transport of the oil within the bio-inspired textile is analyzed by a three-dimensional fluid simulation. This fluid simulation shows that the textile can be optimized by reducing the pile yarn length, increasing the pile yarn spacing, and increasing the pile yarn diameter. For the first time, it has been possible with this simulation to optimize the bio-inspired textile with regard to oil transport with little effort and thus enable the successful implementation of a self-driven and sustainable oil removal method.

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Section: Discussionmentioning

confidence: 99%

Section: Discussion Of the Biomimetic Processmentioning

confidence: 99%

Bio-Inspired Textiles for Self-Driven Oil–Water Separation—A Simulative Analysis of Fluid Transport

Beek,

Skirde,

Akdere

et al. 2024

Biomimetics

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show abstract

“…However, double-structured lotuseffect surfaces maintain the thin air layer only temporarily, but there are several aquatic organisms like the back-swimmer Notonecta or the floating fern Salvinia, which maintain air layers under water for a longer time period [5]. The ability of superhydrophobic surfaces to retain an air film under water drew increased attention in the last years [6][7][8][9][10][11]. In contrast to surfaces with lotus effect, air-retaining surfaces are not selfcleaning and are characterized by a much more complex elaborate surface architecture.…”

Section: Introductionmentioning

confidence: 99%

Elasticity of the hair cover in air-retaining Salvinia surfaces

et al. 2015

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Immersed in water superhydrophobic surfaces (e.g., lotus) maintain thin temporary air films. In certain aquatic plants and animals, these films are thicker and more persistent. Floating ferns of the genus Salvinia show elaborated hierarchical superhydrophobic surface structures: a hairy cover of complex trichomes. In the case of S. molesta, they are eggbeater shaped and topped by hydrophilic tips, which pin the air-water interface and prevent rupture of contact. It has been proposed that these trichomes can oscillate with the air-water interface, when turbulences occur and thereby stabilize the air film. The deformability of such arrays of trichomes requires a certain elasticity of the structures. In this study, we determined the stiffness of the trichome coverage of S. molesta and three other Salvinia species. Our results confirm the elasticity of the trichome coverage in all investigated Salvinia species. We did not reveal a clear relationship between the time of air retention and stiffness of the trichome coverage, which means that the air retention function is additionally dependent on different parameters, e.g., the trichome shape and surface free energy. These data are not only interesting for Salvinia biology, but also important for the development of biomimetic air-retaining surfaces.

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Layers of Air in the Water beneath the Floating Fern Salvinia are Exposed to Fluctuations in Pressure

Mayser¹,

Barthlott

2014

Integrative and Comparative Biology

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Superhydrophobic, hierarchically structured, technical surfaces (Lotus-effect) are of high scientific and economic interest because of their remarkable properties. Recently, the immense potential of air-retaining superhydrophobic surfaces, for example, for low-friction transport of fluids and drag-reducing coatings of ships has begun to be explored. A major problem of superhydrophobic surfaces mimicking the Lotus-effect is the limited persistence of the air retained, especially under rough conditions of flow. However, there are a variety of floating or diving plant and animal species that possess air-retaining surfaces optimized for durable water-repellency (Salvinia-effect). Especially floating ferns of the genus Salvinia have evolved superhydrophobic surfaces capable of maintaining layers of air for months. Apart from maintaining stability under water, the layer of air has to withstand the stresses of water pressure (up to 2.5 bars). Both of these aspects have an application to create permanent air layers on ships' hulls. We investigated the effect of pressure on air layers in a pressure cell and exposed the air layer to pressures of up to 6 bars. We investigated the suppression of the air layer at increasing pressures as well as its restoration during decreases in pressure. Three of the four examined Salvinia species are capable of maintaining air layers at pressures relevant to the conditions applying to ships' hulls. High volumes of air per surface area are advantageous for retaining at least a partial Cassie-Baxter-state under pressure, which also helps in restoring the air layer after depressurization. Closed-loop structures such as the baskets at the top of the "egg-beater hairs" (see main text) also help return the air layer to its original level at the tip of the hairs by trapping air bubbles.

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Optische Geschwindigkeitsmessungen an Luft-haltenden Deckflügeln des Notonecta glauca

Cited by 3 publications

References 5 publications

Bio-Inspired Textiles for Self-Driven Oil–Water Separation—A Simulative Analysis of Fluid Transport

Bio-Inspired Textiles for Self-Driven Oil–Water Separation—A Simulative Analysis of Fluid Transport

Elasticity of the hair cover in air-retaining Salvinia surfaces

Layers of Air in the Water beneath the Floating Fern Salvinia are Exposed to Fluctuations in Pressure

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