Page 30 - Shimadzu Journal vol.8 Issue2

Hydrocarbon Processing Industry

kinetic coefficient of friction and the existence of the adsorp- enabling capture of the flexible tail part of the carboxylic acid
tion layer. molecules. From this data, an adsorption layer molecular model
of the additive was estimated.

SHIMADZU APPLICATION NEWS S45
SHIMADZU APPLICATION NEWS S46

(2) In this example, the adsorption film formed on an iron oxide
surface by carboxylic acid, which is widely used as an oiliness
agent, was analyzed. When the iron oxide surface was subjected FM-AFM can perform high-resolution analyses of the lu-
to a simulated sliding motion using the probe of the FM-AFM bricant-iron oxide interface from as little as 500 µL of lubricant.
in lubricant to which carboxylic acid was added, it was con- Lubricant performance can be evaluated by laboratory scale ma-
firmed that an adsorption film originating from the carboxylic terial tests, so this shows promise as a new evaluation method that
acid had formed on the sliding part. Further, cross sectional will substantially reduce the cost of lubricant development.
imaging was performed at the lubricant-iron oxide interface,

Probe

Z

Y

X
Z

X
Cross-section Imaging
(Z-X)

Topographic Observation
(XY)

Fig. 1. Topographic Observation (XY) and Cross-section Imaging (Z-X) by FM-AFM

Shimadzu Journal vol.8 Issue2 72