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2 article(s) from Kovalev, Alexander E

Surface topography and contact mechanics of dry and wet human skin

Alexander E. Kovalev,
Kirstin Dening,
Bo N. J. Persson and
Stanislav N. Gorb

Beilstein J. Nanotechnol. 2014, 5, 1341–1348, doi:10.3762/bjnano.5.147

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Figure 1: Scanning electron microscopy picture of a mould of wet human wrist skin.

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Figure 2: 3D surface profiles of a mould of wet human wrist skin obtained by using white light interferometry...

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Figure 3: AFM images of a mould of wet human skin taken at (a) lower and (b) higher resolution.

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Figure 4: The power spectra as a function of the wave vector (log₁₀–log₁₀ scale), based on AFM topography dat...

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Figure 5: The power spectra as a function of the wave vector (log₁₀–log₁₀ scale). The dashed line denoted by b...

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Figure 6: The model of the skin used in the calculations. The elastic modulus of the bulk skin is E₁ = 20 kPa...

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Figure 7: The friction coefficient of skin for a glass ball (R = 0.8 cm) at a sliding velocity of 0.8 cm/s an...

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Figure 8: The ratio of the contact area A to the area of the nominal contact area A₀ as a function of the low...

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Figure 9: The area of real contact (in thousandths of the nominal contact area, A₀) as a function of the aver...

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Full Research Paper

Published 22 Aug 2014

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Direct observation of microcavitation in underwater adhesion of mushroom-shaped adhesive microstructure

Lars Heepe,
Alexander E. Kovalev and
Stanislav N. Gorb

Beilstein J. Nanotechnol. 2014, 5, 903–909, doi:10.3762/bjnano.5.103

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Figure 1: Schematic of the experimental setup (A). FMS, force measuring system; S, sample; GS, glass slide; O...

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Figure 2: Schematic of the optical path in the RICM at the glass–water–PVS layers. The incoming beam with int...

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Figure 3: Sample 1 in dry contact with glass (A) and in contact with glass underwater (B). Scale bar, 10 µm.

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Figure 4: Pull-off forces, normalized by the average value of the dry state. Two individual MSAMS samples wer...

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Figure 5: Detachment sequences of individual MSAMSs separating from a glass substrate for the sample 1 in the...

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Figure 6: Simulated image of an individual MSAMS partially detached from a glass substrate submerged in water...

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Full Research Paper

Published 25 Jun 2014

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