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Reverse Stick-Slip on a Periodic Wedge-Shaped Micrograting

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Abstract

We have investigated the time evolution of sliding friction between colloidal spheres of PMMA (with diameters of 3 μm and 9.6 μm) supported by an AFM cantilever and a SiO2 grating consisting of alternated slopes of ± 55° and flat areas, and periodicity comparable or below the sphere diameters. With the larger sphere we recognize a reproducible ‘reverse stick-slip’, which is explained by mere momentum balance consideration. The friction is proportional to the normal load, as expected for elastic contact with a wedge. With the chosen method, a friction coefficient μ ≈ 0.30 and an interfacial shear strength τ ≈ 0.7 GPa can be estimated with no need of force calibration. This response is very different from the regular stick-slip with the periodicity of the grating, which would be observed if the well-known Prandtl–Tomlinson model for the friction experienced on a periodic potential could be scaled up to the present case.

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Authors and Affiliations

  1. Otto Schott Institute of Materials Research (OSIM), Friedrich Schiller University Jena, Löbdergraben 32, 07743, Jena, Germany

    Alper Özoğul, Stephan Gräf, Frank A. Müller & Enrico Gnecco

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  1. Alper Özoğul
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  2. Stephan Gräf
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  3. Frank A. Müller
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  4. Enrico Gnecco
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Correspondence to Enrico Gnecco.

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Özoğul, A., Gräf, S., Müller, F.A. et al. Reverse Stick-Slip on a Periodic Wedge-Shaped Micrograting. Tribol Lett 67, 29 (2019). https://doi.org/10.1007/s11249-019-1139-x

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  • DOI: https://doi.org/10.1007/s11249-019-1139-x

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