[Zurück]

A.M. Bogus, W.S.M. Werner, I. Gebeshuber, M. Dörr, H. Störi:
"Tribochemistry of monomolecular lubricant films of ethanolamine oligomers";
Vortrag: 13th Nordic Symposium on Tribology (NORDTRIB 2008), Scandic Rosendahl Hotel, Tampere/ Finland; 11.06.2008; in: "Book of Abstracts, 13th Nordic Symposium on Tribology (NORDTRIB 2008)", (2008), S. 38.

The aim of this present study was to find out the influence of oxygen and nitrogen containing ethanolamine oligomers on tribological behaviour. X-ray photoelectron spectroscopy (XPS) was used to obtain insight into the molecular mechanisms leading to the macroscopic lubricity. Monomolecular lubricant films were deposited onto ultra thin copper films sputtered onto silicon wafers. Surfaces covered with the three ethanolamine oligomers were investigated by XPS before and after tribological tests, performed with the translatorily oscilating test machine and Falex micro-tribometer.
One of an unexplained mechanism are different lubrication properties of oligomers of ethanolamines. Whereas mono- and diethanolamine oligomer exhibit good lubrication properties triethanolamine oligomer do not and increase surface roughness by corrosive pit into the cooper surface.
The structure of the molecular film is elucidated using angular resolved X-ray photoelectron spectroscopy with a prototype preparation chamber, permitting the transfer of samples from liquid to the analysis chamber under Helium protective gas preventing exposure to ambient conditions. Solutions with a concentration of 250 ppm of the respective ethanolamine oligomers in double distilled water were transferred into the adsorption device, which is an extension of the spectrometer.