Silicone Rubber Adhesion and Sliding Friction

Persson, B. N. J.

doi:10.1007/s11249-016-0680-0

Cited by 21 publications

(13 citation statements)

References 28 publications

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“…For these specific sample -substrate combinations, we expect different friction behaviour to be a result of different friction mechanisms. Here, we assume that mechanical interlocking (see [16,17,35 -37]) and adhesion-mediated friction (see [38,39]) are the two dominant contributions to friction and that the inversion of friction anisotropy is a result of different relative contributions of both mechanisms for the different sample -substrate combinations. In the following, we restrict our analysis to these particular cases.…”

Section: Resultsmentioning

confidence: 99%

Inversion of friction anisotropy in a bio-inspired asymmetrically structured surface

Tramsen

Gorb

Zhang

et al. 2018

J. R. Soc. Interface.

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Friction anisotropy is an important property of many surfaces that usually facilitate the generation of motion in a preferred direction. Such surfaces are very common in biological systems and have been the templates for various bio-inspired materials with similar tribological properties. So far friction anisotropy is considered to be the result of an asymmetric arrangement of surface nano- and microstructures. However, here we show by using bio-inspired sawtooth-structured surfaces that the anisotropic friction properties are not only controlled by an asymmetric surface topography, but also by the ratio of the sample–substrate stiffness, the aspect ratio of surface structures, and by the substrate roughness. Systematically modifying these parameters, we were able to demonstrate a broad range of friction anisotropies, and for specific sample–substrate combinations even an inversion of the anisotropy. This result highlights the complex interrelation between the different material and topographical parameters on friction properties and sheds new light on the conventional design paradigm of tribological systems. Finally, this result is also of great importance for understanding functional principles of biological materials and surfaces, as such inversion of friction anisotropy may correlate with gait pattern and walking behaviour in climbing animals, which in turn may be used in robotic applications.

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Section: Resultsmentioning

confidence: 99%

Inversion of friction anisotropy in a bio-inspired asymmetrically structured surface

Tramsen

Gorb

Zhang

et al. 2018

J. R. Soc. Interface.

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“…However, to the best of our knowledge, most conventional 3D vascular replicas developed thus far are made from a monolayer of either elastomers or hydrogels, which do not accurately mimic the geometries and properties of blood vessels. Elastomers, similar to tunica media, have high bulk elasticity [ 19 ] but exhibit high surface elasticity, [ 20 ] high friction, [ 21 ] and underwater aerophilicity. [ 22 ] Because of the high friction, additional lubricants, such as a surfactant solution, [ 23 ] liquid silicone rubber, [ 12 ] or specially designed slippery liquid, [ 24 ] are required to facilitate the control of medical devices.…”

Section: Introductionmentioning

confidence: 99%

3D Vascular Replicas Composed of Elastomer–Hydrogel Skin Multilayers for Simulation of Endovascular Intervention

Lim

Kim

2020

Adv Funct Materials

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Multilayered 3D vascular replicas incorporating the complementary advantages of elastomers and hydrogels can serve as a training platform to realistically simulate endovascular intervention, the preferred therapeutic procedure for cardio‐cerebrovascular disease. However, the fabrication process is challenging because of the difficulty in uniformly coating a thin hydrogel layer only on the inner surface of tortuous 3D vascular replicas composed of an elastomer monolayer. This study proposes an effective strategy to design and produce high‐fidelity 3D vascular replicas composed of elastomer–hydrogel multilayers by coating hydrogel polymers with robust interfaces only on the inner surface of the elastomer monolayer. The thin hydrogel layer can impart soft surface elasticity, lubricity, and superaerophobicity to the elastomer monolayer with high bulk elasticity, with deionized water alone as the circulating liquid, without the aid of additional lubricants. Owing to the complementary properties of the elastomers and hydrogels, multilayered 3D vascular replicas facilitate the control of medical devices and internal circulation of fluids, enabling realistic simulations of endovascular intervention under optical images in addition to X‐ray angiography. Furthermore, through practice courses, neurosurgeons demonstrated that the multilayered 3D vascular replicas are a reasonable platform for developing hand–eye coordination with pre‐procedure simulations and case‐specific training on demanding surgical sites.

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“…On the flat substrate (see Figure 3a), the GMFP exhibits extremely high friction forces at low normal load. This can be attributed to the high adhesion forces of the GMFP's flexible membrane 20,36. While the flat silicone sample would be expected to perform equally well, the minimal stress caused by the fixation of the sample onto the sample holder leads to a slight deformation of the flat silicone.…”

mentioning

confidence: 99%

“…This can be attributed to the high adhesion forces of the GMFP's flexible membrane. [20,36] While the flat silicone sample would be expected to perform equally well, the minimal stress caused by Adv. Mater.…”

mentioning

confidence: 99%

“…When coming into contact with any kind of substrate, the flexible membrane conforms to the substrate and creates a large real contact area 17. The granular material encased by the membrane is loosely packed and behaves like a fluid,18,19 enabling it to conform to the substrate, which results in a minimum of stored elastic deformation energy at the interface to maximize adhesion‐mediated friction20,21 (see Figure a). Upon applying normal load, the granular material undergoes the jamming transition22,23 and becomes solid‐like (see Figure 1b).…”

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confidence: 99%

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Maximizing Friction by Passive Jamming

Tramsen

Filippov

Gorb

et al. 2020

Adv Materials Inter

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Many solutions for getting grip on varying substrates exist in nature and in technical applications, but they fail on substrate geometries they are not specifically designed for. A novel passive load‐dependent system is developed that creates high friction forces on a large variety of substrates: the granular media friction pad. With an elastic membrane encasing granular media, it reversibly undergoes the jamming transition only by varying the normal load. Here, the friction performance on different substrates is shown and the underlying physical mechanisms in a numerical simulation are investigated.

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Silicone Rubber Adhesion and Sliding Friction

Cited by 21 publications

References 28 publications

Inversion of friction anisotropy in a bio-inspired asymmetrically structured surface

Inversion of friction anisotropy in a bio-inspired asymmetrically structured surface

3D Vascular Replicas Composed of Elastomer–Hydrogel Skin Multilayers for Simulation of Endovascular Intervention

Maximizing Friction by Passive Jamming

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