S115025 QCMによるオレイン酸吸着挙動に及ぼす濃度及び表面材料の影響に関する研究([S11502]トライボロジーの基礎と応用(2))

概要

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Formation of adsorption layer on sliding surfaces plays important roles in friction and wear of materials under boundary lubrication with additives. It is necessary to monitor the adsorption behavior of the lubricant additives. There are a lot of methods to measure preformed films, for example, Atom Force Microscope (AFM) and ellipsometer. However, they are not established methods and not available for monitoring the adsorption behavior of the lubricant additives. In this study, we applied Quartz Crystal Microbalance (QCM) for the in-situ monitoring phenomena. QCM is a sensitive mass measuring method based on an inverse piezoelectric effect and it is able to measure adsorption to variety surfaces by changing the sensor surface materials. Oleic acid was added as an additive to Hexadecane. Mass change derived from adsorption of additive was measured as frequency shift by QCM. In this experiment, we compared some types of sensors. They have different material surfaces, gold (Au) and Copper (Cu), etc. We compared the experimental results according to concentration ratio of the oleic acid with each materials. In QCM experiments measuring the adsorption behavior, differences were shown between using Cu sensor and Au sensor. It is confirmed that the concentration ratio of oleic acid exert influence on the adsorption behavior.
一般社団法人日本機械学会の論文
2011-09-11