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Unexpected frictional behavior of laser-textured hydrophobic surfaces

Abstract : Hydrophobic surfaces can allow a liquid to slip over the surface and can thus reduce 1 friction in lubricated contact working in a full film regime. Theory supports that the amount of slip 2 can be increased if super-hydrophobic surfaces that are composed of a textured low surface energy 3 material are used. In this work, polytetrafluoroethylene (PTFE) polymer samples were textured 4 with a femto second laser to create super-hydrophobic surfaces by machining a hexagonal network 5 of small circular holes with 10 and 20 µm lattice sides. The frictional behavior of these surfaces 6 was compared to the smooth PTFE samples. Surprisingly, the textured surfaces revealed higher 7 friction coefficients than the smooth surfaces. This higher friction can be explained by a change of 8 wetting regime due to high pressure in fluid and a possible generation of vortices in the cavities.
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https://hal.archives-ouvertes.fr/hal-03376141
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Submitted on : Wednesday, October 13, 2021 - 12:13:38 PM
Last modification on : Wednesday, October 20, 2021 - 3:22:17 AM

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Hiba Jendoubi, Olga Smerdova, Noël Brunetière. Unexpected frictional behavior of laser-textured hydrophobic surfaces. Lubricants, MDPI, 2021, 9 (3), pp.31. ⟨10.3390/lubricants9030031⟩. ⟨hal-03376141⟩

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