Abstract
This paper presents measurements of friction force exerted on molecularly thin lubricant film surfaces using a specially arranged pin-on-disk type friction tester. The measurements were carried out by sliding a 1.5mm diameter glass ball slider on the rotating disk surface with small loading force. PFPE lubricants with and without functional end-groups were dip-coated on magnetic disks covered with diamond-like-carbon (DLC) film. Lubricant film thickness was varied to constitute multiple layered structures of lubricant film on the DLC surface to clarify the stratified effect of thin lubricant film on friction. The tested results indicated that the friction force on the lubricant surface was intimately dependent not only on loading force but also on the layered structure of lubricant film. The effects of the layered structure on friction can be attributed to the interaction between the slider and the lubricant, resulting from the behavior of the end-group functionality.
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