Role of fingerprint-inspired relief structures in elastomeric slabs for detecting frictional differences arising from surface monolayers

Soft Matter
Charles DhongDarren J Lipomi

Abstract

The perception of fine texture of an object is influenced by its microscopic topography and surface chemistry-i.e., the topmost layer of atoms and molecules responsible for its surface energy, adhesion, and friction generated when probed by a fingertip. Recently, it has been shown that human subjects can discriminate high-energy (i.e., hydrophilic), oxidized silicon from low-energy (i.e., hydrophobic), fluorinated alkylsilane-coated silicon. The basis of discrimination was consistent with differences between stick-slip friction frequencies generated when sliding the fingertip across the two surfaces. One aspect that was not examined was the presence of surface relief structures on the fingertip. Indeed, papillary ridges-fingerprints-may be involved in enhanced discrimination of fine textures arising from surface roughness, but how (or whether) fingerprints may also be involved in the discrimination of surface chemistry-through its effect on friction-is unknown. Here, using a mock finger made from a slab of silicone rubber shows that relief structures amplify differences in stick-slip friction when slid across either a hydrophilic oxide or a hydrophobic monolayer on silicon. We quantify the similarity between the friction traces...Continue Reading

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Citations

Jul 20, 2021·Advanced Functional Materials·Darren J LipomiVilayanur S Ramachandran
Sep 3, 2021·PloS One·Mickey FinnDarren J Lipomi

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Methods Mentioned

BETA
atomic force microscopy

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