Influence of surface structure and chemistry on water droplet splashing

Koch, Kerstin; Grichnik, Roland

doi:10.1098/rsta.2016.0183

Cited by 16 publications

(8 citation statements)

References 57 publications

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“…Dynamic interactions between water droplets and the surfaces are well researched in the different types of splash-phenomena described, e.g., in Rioboo et al [ 119 ], Yarin [ 113 ], Xu et al [ 118 ], Motzkus et al [ 120 ], Gilet and Bourouiba [ 121 ], and Koch and Grichnik [ 122 ]. More recently in focus came the contact times between droplets and surfaces: the time span a drop impacting and bouncing on a hydrophobic surface is in contact with the surface.…”

Section: Physical Basis Of Surface Wettingmentioning

confidence: 99%

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Plant Surfaces: Structures and Functions for Biomimetic Innovations

et al. 2017

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An overview of plant surface structures and their evolution is presented. It combines surface chemistry and architecture with their functions and refers to possible biomimetic applications. Within some 3.5 billion years biological species evolved highly complex multifunctional surfaces for interacting with their environments: some 10 million living prototypes (i.e., estimated number of existing plants and animals) for engineers. The complexity of the hierarchical structures and their functionality in biological organisms surpasses all abiotic natural surfaces: even superhydrophobicity is restricted in nature to living organisms and was probably a key evolutionary step with the invasion of terrestrial habitats some 350–450 million years ago in plants and insects. Special attention should be paid to the fact that global environmental change implies a dramatic loss of species and with it the biological role models. Plants, the dominating group of organisms on our planet, are sessile organisms with large multifunctional surfaces and thus exhibit particular intriguing features. Superhydrophilicity and superhydrophobicity are focal points in this work. We estimate that superhydrophobic plant leaves (e.g., grasses) comprise in total an area of around 250 million km2, which is about 50% of the total surface of our planet. A survey of structures and functions based on own examinations of almost 20,000 species is provided, for further references we refer to Barthlott et al. (Philos. Trans. R. Soc. A 374: 20160191, 1). A basic difference exists between aquatic non-vascular and land-living vascular plants; the latter exhibit a particular intriguing surface chemistry and architecture. The diversity of features is described in detail according to their hierarchical structural order. The first underlying and essential feature is the polymer cuticle superimposed by epicuticular wax and the curvature of single cells up to complex multicellular structures. A descriptive terminology for this diversity is provided. Simplified, the functions of plant surface characteristics may be grouped into six categories: (1) mechanical properties, (2) influence on reflection and absorption of spectral radiation, (3) reduction of water loss or increase of water uptake, moisture harvesting, (4) adhesion and non-adhesion (lotus effect, insect trapping), (5) drag and turbulence increase, or (6) air retention under water for drag reduction or gas exchange (Salvinia effect). This list is far from complete. A short overview of the history of bionics and the impressive spectrum of existing and anticipated biomimetic applications are provided. The major challenge for engineers and materials scientists, the durability of the fragile nanocoatings, is also discussed.

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Section: Physical Basis Of Surface Wettingmentioning

confidence: 99%

“…In plants, this phenomenon was analyzed in Calathea zebrina, a hydrophilic tropical understory plant, and its corresponding polymer replica (Fig. 30 ) by [ 122 ]. The anti-splashing effect is promising for biomimetic applications.…”

Section: Biomimetic Applicationmentioning

confidence: 99%

Plant Surfaces: Structures and Functions for Biomimetic Innovations

et al. 2017

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“…The geometrical structure of an impacted solid surface also plays an important role in the surface damage characteristics (Tomita et al 2002;Koch & Grichnik 2016;Kondo & Ando 2019;Rajesh et al 2019). For example, high-speed droplet impingement occurs in power plant pipes, and small holes are usually produced at the pipe surface where the pipe is bent, which is one of the major restraining factors for the equipment's lifetime (Li, Mori & Ninokata 2012).…”

Section: Introductionmentioning

confidence: 99%

“…The geometrical structure of an impacted solid surface also plays an important role in the surface damage characteristics (Tomita et al. 2002; Koch & Grichnik 2016; Kondo & Ando 2019; Rajesh et al. 2019).…”

Section: Introductionmentioning

confidence: 99%

Curved surface effect on high-speed droplet impingement

Liu

Wang

2020

J. Fluid Mech.

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“…As a consequence, the style irreversibly curls up in a split second and pollen (pp) is transmitted to the insect’s body (Claßen-Bockhoff, 1991). It took 50 years of investigation to understand the pollination mechanism (Lindley, 1819, 1826; Nees von Esenbeck, 1831; Gris, 1859; Delpino, 1869) but the biomechanics on which the style bending is based on, is still unknown.…”

Section: Introductionmentioning

confidence: 99%

Insights Into the Inside – A Quantitative Histological Study of the Explosively Moving Style in Marantaceae

2018

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This study aims to identify the histological basis for the extraordinary, fast movement of the style in Marantaceae. Although this explosive pollination mechanism was subject of many studies, quantitative measurements to document volumetric changes have never been conducted. Based on physical parameters and limitations (poroelastic time), the movement itself is by far too fast to be explained by turgor changes solely. Therefore, we address the hypothesis that the style contains elastic structures to store energy allowing the fast movement. We provide an experimental approach in Goeppertia bachemiana to identify histological differences of styles in various states, i.e., steady, unreleased, and released state. Cross and longitudinal sections were used to reconstruct the cell volume in different sectors of the style. Histological data were discussed with respect to a putative water shift (turgor movement) and elastic instabilities that were proposed to explain the style movement of Marantaceae. Current data show, that the upper epidermis is under tensile stress in the unreleased state. After style release, the lower side of the style revealed an enormous water up-take. According to our results, we hypothesize that the fast style movement of G. bachemiana is likely based on an elastically stretched upper epidermis, whereas a “soaking tissue” at the lower side presumably mediates the up curling of the style. The experimental data show that at least for G. bachemiana, physical limitations such as the poroelastic time are suitable parameters to predict movements that are based on elastic instabilities.

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Influence of surface structure and chemistry on water droplet splashing

Cited by 16 publications

References 57 publications

Plant Surfaces: Structures and Functions for Biomimetic Innovations

Plant Surfaces: Structures and Functions for Biomimetic Innovations

Curved surface effect on high-speed droplet impingement

Insights Into the Inside – A Quantitative Histological Study of the Explosively Moving Style in Marantaceae

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