NDLI: Temperature effect on spreading of perfluoropolyethers on amorphous carbon films

Content Provider	Springer Nature Link
Author	Ma, Xiaoding Tang, Huan Gui, Jing
Copyright Year	2001
Abstract	The temperature effect on the spreading behavior of Fomblin Zdol and Z on amorphous carbon surfaces has been studied by scanning micro-ellipsometry. The temperature range explored in this study spans from 26 to 56 °C under 0% relative humidity. The results show that while temperature in general accelerates surface diffusion, it has little effect on the surface conformation of the lubricants. The diffusion coefficient versus film thickness maintains the same shape, only the overall amplitude increases with increasing temperature. The activation energy E$_{a}$ is found to be relatively insensitive to the lubricant coverage up to one monolayer. The average activation energy is around 37 kJ/mol for Zdol (M$_{n}$=2500 g/mol), and around 21 kJ/mol for Z of the same molecular weight. With increasing molecular weight the activation energy increases but the rate of increase is very moderate. More interestingly, the activation energy versus molecular weight curves for Zdol and Z are nearly parallel to each other, suggesting that the interactions between the main-chain and the carbon surface are essentially independent of the interactions between the end-groups and the carbon surface.
Starting Page	203
Ending Page	209
Page Count	7
File Format	PDF
ISSN	10238883
Journal	Tribology Letters
Volume Number	10
Issue Number	4
e-ISSN	15732711
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2001-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physical Chemistry Surfaces and Interfaces, Thin Films Mechanics
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Mechanics of Materials Mechanical Engineering Surfaces and Interfaces

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