Host: The Japan Society of Vacuum and Surface Science
Name : Annual Meeting of the Japan Society of Vacuum and Surface Science 2023
Location : [in Japanese]
Date : October 31, 2023 - November 02, 2023
We have investigated the friction properties on nanoscale and macroscale using alkyl-substituted phthalocyanine derivatives. The frictional properties on nanoscale depended on the two-dimensional molecular structure of physisorbed molecules. On the other hand, the frictional properties on macroscale were independent on the physisorbed molecules. We considered the change in effective viscosity with contact pressure to compare the nanoscopic with macroscopic behavior. Recently, we have attempted to investigate the interfacial molecular behavior of a lubrication film composed of nonpolar base oil and polar additives. Nonpolar base oil molecules were involved in the formation of a lubricating film, which mainly composed of polar additives at the interface. Comparing the molecular behavior with the frictional property, this physisorbed nonpolar base oil molecules might contributed to the friction reduction.