Abstract
The presence or absence of unsaturation in the carbon chain of carboxylic acids was examined on the friction response of boundary films according to normal force. Friction laws were established as a function of the normal force at the nanoscale with a molecular tribometer derived from a surface force apparatus. While the shear plane is mainly composed of methyl groups in all the cases investigated, the molecular organization differs within the shear plane, as suggested by the simultaneous film thickness evolution. This gave rise to dissipation modes within the interface, resulting in a wide range of shear stress levels and dependence with contact pressure. The friction laws were discussed, highlighting the combined role of nanometric surface roughness and molecule unsaturation.
Graphic Abstract
Friction laws for stearic acid ( ), elaidic acid ( ), and oleic acid ( ) boundary layers and schematic diagrams of the corresponding sheared interfaces
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Supporting Information is available from the corresponding author, JCB, upon reasonable request.
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Acknowledgements
This article is in memory of Professor Mark Robbins. This work was financed by the Agence Nationale de la Recherche via the project Confluence project ANR-13-JS09-0016-01 and by the LABEX Manutech-Sise (ANR-10-LABX-0075) of Université de Lyon, within the program “Investissements d’Avenir” (ANR-11-IDEX-0007) operated by the French National Research Agency (ANR), via the project DysCo. Additional support was also provided by the Agency for the ecological transition ADEME through the IMOTEP project.
Funding
This work was supported by the Agence Nationale de la Recherche via the project Confluence ANR-13-JS09-0016-01 and by the LABEX Manutech-Sise (ANR-10-LABX-0075) of Université de Lyon, within the program “Investissements d’Avenir” (ANR-11-IDEX-0007) operated by the French National Research Agency (ANR), via the project DysCo. Additional support was also provided by the Agency for the ecological transition ADEME through the IMOTEP project.
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JCB designed the study and wrote the initial version of the manuscript. Data collection and analysis were performed by AC, FA, NM, and JCB. The theoretical model was developed by DM. Manuscript editing, and revisions were performed by FA, NM, DM, and JCB.
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Abouhadid, F., Crespo, A., Morgado, N. et al. Friction Laws for Saturated/Unsaturated Fatty Acid Layers. Tribol Lett 69, 46 (2021). https://doi.org/10.1007/s11249-021-01419-9
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DOI: https://doi.org/10.1007/s11249-021-01419-9