Effect of micropillar surface texturing on friction under elastic dry reciprocating contact

Muthukumar, M.; Bobji, M. S.

doi:10.1007/s11012-017-0816-9

Cited by 10 publications

(5 citation statements)

References 44 publications

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“…In a series of sliding tests, both textured surfaces were seen to trap wear debris and had a lower coefficient of friction than the nominally smooth surfaces. Other investigations on metal textured surfaces and the associated functional response are discussed in [91].…”

Section: Metal Texturingmentioning

confidence: 99%

Influence of Surface Texturing on the Dry Tribological Properties of Polymers in Medical Devices

Evangelista,

Wencel,

Beguin

et al. 2023

Polymers

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There is a constant need to improve patient comfort and product performance associated with the use of medical devices. Efforts to optimise the tribological characteristics of medical devices usually involve modifying existing devices without compromising their main design features and functionality. This article constitutes a state-of-the-art review of the influence of dry friction on polymeric components used in medical devices, including those having microscale surface features. Surface tribology and contact interactions are discussed, along with alternative forms of surface texturing. Evident gaps in the literature, and areas warranting future research are highlighted; these include friction involving polymer Vs polymer surfaces, information regarding which topologies and feature spacings provide the best performing textured surfaces, and design guidelines that would assist manufacturers to minimise or maximise friction under non-lubricated conditions.

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Section: Metal Texturingmentioning

confidence: 99%

Influence of Surface Texturing on the Dry Tribological Properties of Polymers in Medical Devices

Evangelista,

Wencel,

Beguin

et al. 2023

Polymers

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“…Micropillars are three-dimensional microstructures characterized by a very large extension in one dimension, resulting in a great aspect ratio. Nowadays, many applications in diverse fields are taking advantage of micropillars such as optics, tribology, biology, and biomedical engineering. − Usually, micropillars are fabricated in a cleanroom by subtractive processes such as photolithography in combination with dry and wet etching, wire-electrode cutting, bulk micromachining, and laser cutting. − One microfabrication method that is gaining increased popularity is 3D inkjet printing. It is an attractive technique for micropillar production because it allows flexible, room-temperature, scalable, and economical fabrication processes. − Among different applications of micropillars in biomedical engineering, perhaps the most relevant are 3D microelectrode arrays (3D MEAs).…”

Section: Introductionmentioning

confidence: 99%

“…Three-dimensional microelectrode arrays have attracted considerable interest due to their use in various applications for in vivo and in vitro studies, such as cellular recording, biosensors, and drug delivery. − This is because three-dimensional structures allow for increased device area, spatial resolution, and signal-to-noise ratio. In the case of cellular recording, conductive micropillars are used as the interface between the device and the cell under investigation to measure action potentials. − Regarding biosensors and biomedical implants, the micropillar-based electrodes act as a vital component for monitoring organ activity and electrically/optically/thermally stimulated therapy. − In the electrode–tissue interface, the mechanical mismatch between the tissues and the electrode should be minimized to avoid invasive tissue damage and related loss of devices.…”

Section: Introductionmentioning

confidence: 99%

Determination of Stiffness and the Elastic Modulus of 3D-Printed Micropillars with Atomic Force Microscopy–Force Spectroscopy

Cortelli

Grob

Patruno

et al. 2023

ACS Appl. Mater. Interfaces

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Nowadays, many applications in diverse fields are taking advantage of micropillars such as optics, tribology, biology, and biomedical engineering. Among them, one of the most attractive is three-dimensional microelectrode arrays for in vivo and in vitro studies, such as cellular recording, biosensors, and drug delivery. Depending on the application, the micropillar's optimal mechanical response ranges from soft to stiff. For long-term implantable devices, a mechanical mismatch between the micropillars and the biological tissue must be avoided. For drug delivery patches, micropillars must penetrate the skin without breaking or bending. The accurate mechanical characterization of the micropillar is pivotal in the fabrication and optimization of such devices, as it determines whether the device will fail or not. In this work, we demonstrate an experimental method based only on atomic force microscopy−force spectroscopy that allows us to measure the stiffness of a micropillar and the elastic modulus of its constituent material. We test our method with four different types of 3D inkjet-printed micropillars: silver micropillars sintered at 100 and 150 °C and polyacrylate microstructures with and without a metallic coating. The estimated elastic moduli are found to be comparable with the corresponding bulk values. Furthermore, our findings show that neither the sintering temperature nor the presence of a thin metal coating plays a major role in defining the mechanical properties of the micropillar.

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“…Such an interface specialization can be pursued, for instance, by micro-structuring the surfaces in micro-pillars and nanofibers with specific aspect ratio, size, and orientation. Recent studies 12 – 14 have experimentally investigated the effect of the interfacial micropillars geometry on dry friction between both soft and hard contact pairs (namely steel and low-density polyethylene), showing that specific design conditions are able to produce an effective friction reduction. Similarly, experimental measurements have also been performed in smaller structures 15 , 16 , such as polymeric nano hairs and nanofibers opportunely machined via colloidal lithography, aiming at highlighting the effect of the micro-structures aspect ratio on the frictional behavior.…”

Section: Introductionmentioning

confidence: 99%

Dynamically induced friction reduction in micro-structured interfaces

Menga

Bottiglione

Carbone

2021

Sci Rep

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We investigate the dynamic behavior of a regular array of in-plane elastic supports interposed between a sliding rigid body and a rigid substrate. Each support is modelled as a mass connected to a fixed pivot by means of radial and tangential elastic elements. Frictional interactions are considered at the interface between the supports and the sliding body. Depending on the specific elastic properties of the supports, different dynamic regimes can be achieved, which, in turn, affect the system frictional behavior. Specifically, due to transverse microscopic vibration of the supports, a lower friction force opposing the macroscopic motion of the rigid body can be achieved compared to the case where no supports are present and rubbing occurs with the substrate. Furthermore, we found that the supports static orientation plays a key role in determining the frictional interactions, thus offering the chance to specifically design the array aiming at controlling the resulting interfacial friction force.

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Effect of micropillar surface texturing on friction under elastic dry reciprocating contact

Cited by 10 publications

References 44 publications

Influence of Surface Texturing on the Dry Tribological Properties of Polymers in Medical Devices

Influence of Surface Texturing on the Dry Tribological Properties of Polymers in Medical Devices

Determination of Stiffness and the Elastic Modulus of 3D-Printed Micropillars with Atomic Force Microscopy–Force Spectroscopy

Dynamically induced friction reduction in micro-structured interfaces

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