TitleDirect observation of adsorbed additive layer at solid-liquid interface by frequency-modulation atomic force microscopy
SourceMITC2015-pp 292-293
AuthorK. Fujino, R. Kawamura, T. Matsuoka, T. Hirayama, H. Onishi


Although an adsorbed additive layer is known to reduce friction, the layer structure on a metal surface is still unclear. In particular, there have been no studies that succeeded in obtaining cross-sectional images of an adsorbed layer in lubricant. This study used frequency modulation atomic force microscopy (FM-AFM) to obtain in-situ images. Hexadecane and palmitic acid were used as a model base oil and a typical oil additive, respectively, and a copper-coated silicon wafer was used as the target surface. A clear cross-sectional image of the solid-liquid interface was obtained. It showed that the additive layer was initially monolayer. Then, as the concentration of palmitic acid was increased, the additive layer grew into a multilayer. 


MITC2015-pp 292-293