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Friction 2023, 11(9): 1755-1770 https://doi.org/10.1007/s40544-023-0742-1
Research Article | Open Access | Issue | Published: 13 March 2023

Deformation- and rupture-controlled friction between PDMS and a nanometer-scale SiOx single-asperity

Show Author's Information Arnaud CARON( )
School of Energy, Materials and Chemical Engineering, KoreaTech–Korea University of Technology and Education, Cheonan 31253, Republic of Korea
Keywords:
friction, adhesion, atomic force microscopy (AFM), fracture, polydimethylsiloxane (PDMS)
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CARON A. Deformation- and rupture-controlled friction between PDMS and a nanometer-scale SiOx single-asperity. Friction, 2023, 11(9): 1755-1770. https://doi.org/10.1007/s40544-023-0742-1
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Abstract Full text About this article

This work investigates the friction between polydimethylsiloxane (PDMS) and silicon oxide (SiOx) in single asperity sliding contact by atomic force microscopy (AFM). Two friction dependences on the normal force are identified: a tensile regime and a compressive regime of normal forces. In the compressive regime, friction is governed by the shear deformation and rupture of junctions between PDMS and SiOx. In this case, the shear strength τ ≈ 10 MPa is comparable with the cohesive strength of PDMS under compressive loading. In contrast, friction in the tensile regime is also affected by the elongation of the junctions. The single SiOx-asperity follows a stick–slip motion on PDMS in both normal force regimes. Statistical analysis of stick–slip as a function of the normal force allows determining the necessary amount of energy to break a SiOx/PDMS junction. Friction between a SiOx-asperity and a PDMS surface can be rationalized based on an energy criterion for the deformation and slippage of nanometer-scale junctions.


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About this article

Deformation- and rupture-controlled friction between PDMS and a nanometer-scale SiOx single-asperity

Show Author's information Arnaud CARON( )
School of Energy, Materials and Chemical Engineering, KoreaTech–Korea University of Technology and Education, Cheonan 31253, Republic of Korea

Abstract

This work investigates the friction between polydimethylsiloxane (PDMS) and silicon oxide (SiOx) in single asperity sliding contact by atomic force microscopy (AFM). Two friction dependences on the normal force are identified: a tensile regime and a compressive regime of normal forces. In the compressive regime, friction is governed by the shear deformation and rupture of junctions between PDMS and SiOx. In this case, the shear strength τ ≈ 10 MPa is comparable with the cohesive strength of PDMS under compressive loading. In contrast, friction in the tensile regime is also affected by the elongation of the junctions. The single SiOx-asperity follows a stick–slip motion on PDMS in both normal force regimes. Statistical analysis of stick–slip as a function of the normal force allows determining the necessary amount of energy to break a SiOx/PDMS junction. Friction between a SiOx-asperity and a PDMS surface can be rationalized based on an energy criterion for the deformation and slippage of nanometer-scale junctions.

Keywords: friction, adhesion, atomic force microscopy (AFM), fracture, polydimethylsiloxane (PDMS)

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Received: 05 June 2022
Revised: 09 September 2022
Accepted: 23 January 2023
Published: 13 March 2023
Issue date: September 2023

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© The author(s) 2023.

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