10 article(s) from Barthlott, Wilhelm
- Full Research Paper
- Published 13 Feb 2019
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Figure 1: The three model species analyzed in the visible spectrum (left) and UV-regime (right): Bidens ferul...
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Figure 2: SEM images of the petal surface structure at the UV-absorbing (left) and UV-reflecting (right) area...
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Figure 3: a) An SEM image with definitions showing the measurement principle of the parameters tip radius, pa...
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Figure 4: Petals and their polymer replicas of B. ferulifolia (left), R. fulgida (center), and E. manescavii ...
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Figure 5: Percent reflection of light by polymer replicas of the petal surfaces at different wavelengths. As ...
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- Full Research Paper
- Published 14 Dec 2018
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Figure 1: a) The backswimmer N. glauca. The silvery shine on the surface of the hemelytra is caused by the to...
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Figure 2: a) Left hemelytron of the backswimmer N. glauca. Four sections, defined by Wachmann [17], are shown. b)...
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Figure 3: Transmission electron microscopy images of setae on the hemelytra of N. glauca. a–d) Clavus. a) Tub...
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Figure 4: a) Three-dimensional reconstruction of a hemelytron µCT scan. The tomography data allowed an analys...
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Figure 5: Toluidine blue/borax stained semi-thin sections through the clavus of a hemelytron of N. glauca (do...
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Figure 6: a) Image of a water droplet detaching from the surface of N. glauca. The deformation of the droplet...
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Figure 7: Proposed Notonecta forewing surface function. An air layer is kept in between the setae. The club-s...
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Figure 8: a) Setup used for the proof of concept for the biomimetic Notonecta sensor inspired by the backswim...
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- Full Research Paper
- Published 07 Feb 2018
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Figure 1: Consecutive AFM images of Lotus (Nelumbo nucifera) wax tubule recrystallization on HOPG, taken betw...
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Figure 2: Schematic drawing showing the different stages and modes of tubule formation.
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Figure 3: a) Plot of the average height (nm) of Lotus (Nelumbo nucifera) wax tubules vs time (min) grown on H...
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Figure 4: Consecutive AFM images showing Lotus (Nelumbo nucifera) wax tubule growth and dissolution on HOPG, ...
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Figure 5: AFM images of Lotus (Nelumbo nucifera) wax structures on HOPG after applying a 10 mg/mL wax solutio...
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Figure 6: AFM image of Lotus (Nelumbo nucifera) wax tubule growth on HOPG after applying 0.2 mg/mL wax soluti...
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Figure 7: Consecutive AFM images of Lotus (Nelumbo nucifera) wax tubule growth on HOPG, taken between 16 min ...
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Figure 8: Consecutive AFM images of Lotus (Nelumbo nucifera) wax tubule growth on HOPG, taken between 41 min ...
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Figure 9: Comparison of the two wax features within the dashed rectangle in Figure 1a with the marked structure in Figure 8d. T...
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Figure 10: Consecutive AFM images of Lotus (Nelumbo nucifera) wax tubule growth on HOPG, taken between 16 min ...
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- Full Research Paper
- Published 11 Aug 2017
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Figure 1: Biological role models of air-retaining Salvinia effect surfaces. a) The floating fern Salvinia mol...
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Figure 2: Representation of the measurement of the air–water interface on submerged structures performed in t...
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Figure 3: Architecture of the epoxy replica samples used in this study. a) SEM image of a sample with micro-p...
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Figure 4: Photographic images of a submerged air-retaining sample with micro-pillars taken over a duration of...
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Figure 5: AFM images (a, c) and the corresponding cross-sections (red lines in b, d) of the sample. The image...
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Figure 6: Two possibilities for the contact between AFM tip and air–water interface: a) the interface is pinn...
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Figure 7: Force–distance curve measured at the air–water interface of a submerged air-retaining sample. Posit...
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Figure 8: a) AFM image in contact mode taken on a submerged air-retaining sample with an applied force of 6.4...
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Figure 9: Water depth relative to the pillar tops as a function of force applied during scanning. For each da...
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Figure 10: An artistic 3D representation of the air–water interface, which does not represent actual measureme...
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- Full Research Paper
- Published 02 Jan 2015
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Figure 1: Description of the experimental method. (a) The experimental setup: A small elastic entity, in this...
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Figure 2: Meniscus immediately before snap-off. The profile can be fit by an elliptical function (Equation 1, y(x)) wit...
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Figure 3: Force–elongation curve of a Salvinia molesta trichome. CAT allows force–elongation curves of small ...
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Figure 4: Examination of a human head hair. In this variation of the CAT, the hair is used as a bending sprin...
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Figure 5: Proof of concept and accuracy of CAT, using specially calibrated AFM cantilevers. Determining the s...
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- Full Research Paper
- Published 10 Jun 2014
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Figure 1: Leaf of Salvinia molesta floating on water. The leaf surface is densely covered with complex superh...
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Figure 2: Air volume per surface area measured on four different Salvinia species. a) S. minima (n = 10), b) ...
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Figure 3: Air volume per surface area measured on four different Salvinia species compared to the calculated ...
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Figure 4: SEM images of technical and biological microstructured surfaces used for air volume measurements. a...
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Figure 5: Buoyancy measurement setup. a) Schematic drawing of the measurement setup. A bent metal needle is g...
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Figure 6: Schematic drawing showing the structural parameters acquired from microscopic images of Salvinia le...
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Figure 7: Scheme of the replication of the air–water interface. a) A Salvinia leaf is placed upside down on w...
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- Full Research Paper
- Published 04 May 2011
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Figure 1: Macro photo of a water droplet on a flower of the wild pansy (Viola tricolor).
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Figure 2: SEM micrographs of the petal surfaces (1a–4a), the uncoated polymer replicas (1b–4b) and the coated...
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Figure 3: Diagram of the micropapillae dimensions of the average papilla shape on the upper surface of the Co...
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Figure 4: Static CAs of 5 µl water droplets on the surfaces of fresh (original) petals, their uncoated and co...
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Figure 5: TAs of 5 µl water droplets on the surfaces of fresh (original) Cosmos, Dahlia, Rosa and Viola flowe...
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Figure 6: Cryo-SEM micrograph of the micropapillae of a Viola petal in contact with the surface of a water-gl...
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- Full Research Paper
- Published 10 Mar 2011
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Figure 1: (a) Lotus leaves, which exhibit extraordinary water repellency on their upper side. (b) Scanning el...
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Figure 2: Epidermis cells of the leaf upper side with papillae. The surface is densely covered with wax tubul...
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Figure 3: SEM images of the papillose leaf surfaces of Nelumbo nucifera (Lotus) (a), Euphorbia myrsinites (b)...
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Figure 4: The contact between water and superhydrophobic papillae at different pressures. At moderate pressur...
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Figure 5: Measured forces between a superhydrophobic papilla-model and a water drop during advancing and rece...
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Figure 6: Papillose and non-papillose leaf surfaces with an intact coating of wax crystals: (a) Nelumbo nucif...
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Figure 7: Traces of natural erosion of the waxes on the same leaves as in Figure 6: (a) Nelumbo nucifera (Lotus); (b) ...
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Figure 8: Test for the stability of the waxes against damaging by wiping on the same leaves: (a) Nelumbo nuci...
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Figure 9: SEM and LM images of cross sections through the papillae. Lotus (a,b) and Euphorbia myrsinites (c,d...
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Figure 10: Epicuticular wax crystals in an area of 4 × 3 µm2. The upper side of the lotus leaf (a) has the hig...
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Figure 11: Chemical composition of the separated waxes of the upper and lower side of the lotus leaf. The uppe...
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Figure 12: X-ray diffraction diagram of upperside lotus wax. The ‘long spacing’ peaks indicate a layer structu...
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Figure 13: Model of a wax tubule composed of layers of nonacosan-10-ol and nonacosanediol molecules. The OH-gr...
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Video
- Full Research Paper
- Published 10 Mar 2011
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Figure 1: Lateral view on the water bug Notonecta glauca.
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Figure 2: Selected air retaining body parts of Notonecta glauca: A,B) setae on the abdominal sternites; C,D) ...
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Figure 3: Submerged body parts of Notonecta glauca in the course of time. All surfaces were treated with a hy...
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Figure 4: Air retention [classes] of the submerged surfaces of Notonecta glauca vs time. All surfaces were tr...
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Figure 5: Air covered surface on the upper side of the elytron at increasing inflow velocity.
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Figure 6: Averaged velocity field over the elytron surface (upper side).
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Figure 7: Velocity component u parallel to the elytron surface recorded along path in Figure 6.
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