Liquid lubricants are frequently used to reduce sliding friction and wear at the interface of solid surfaces. The behavior of lubricant molecules squeezed in a narrow gap between solids has been studied by Israelachvili [1]. However, in the present work, friction at the interface generated between a substrate and a film consisting of adsorbed inactive atoms and molecules will be considered on a nanoscale. Friction of adsorbed film can be measured by controlling conditions on adsorbed film and those of a substrate from an experimental point of view. From a theoretical point of view, model calculations and experimental simulation can be accomplished comparatively easily. Understanding friction will probably advance by studying such simple systems. Important points in the problem of interfacial friction of adsorbed films are as follows.
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