Friction Laws for Saturated/Unsaturated Fatty Acid Layers

The presence or absence of unsaturation in the carbon chain carboxylic acids was examined on friction response boundary films according to normal force. Friction laws were established as a function force at nanoscale with molecular tribometer derived from surface apparatus. While shear plane is mainly composed methyl groups all cases investigated, organization differs within plane, suggested by simultaneous film thickness evolution. This gave rise dissipation modes interface, resulting wide range stress levels and dependence contact pressure. discussed, highlighting combined role nanometric roughness molecule unsaturation. for stearic acid ( ), elaidic oleic ) layers schematic diagrams corresponding sheared interfaces