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New Insights in adsorption processes of lubricant additives

Jennifer Honselmann; Martin Dienwiebel; Patrick Wilke; Thomas Rühle

Abstract (englisch):
Since the initial studies by Spikesin the 80s, adsorption mechanisms of lubricant oil additives gained significant attention, as can be seen by a total of approximately 20 publications in 2018 (see e.g. [1,2]).The presented theories are mostly based on ex-and post-mortem studies or simulations. Here, we present in-situ adsorption studies, using aquartz crystal microbalance with dissipation QCM-D(e.g. [3,4]).The QCM-D is a nanogram-sensitive technique to study adsorbed amounts (from frequency information) and viscoelastic properties (from dissipation) of theadsorbed molecules. Fig. 1 shows an exemplary frequency and dissipation shift during adsorption of a friction modifier from mineralbase oil. The frequency decreases after the media change from base oil to base oil + additive, which indicates a mass increase (adsorption). The dissipation increases after the medium change, so theadditive coating shows an increased viscoelasticity compared to thepure base oil. Interestingly, by changing the medium back to pure base oil the frequency decreases and the dissipation slightly increasesagain. ... mehr



Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Computational Materials Science (IAM-CMS)
Publikationstyp Vortrag
Jahr 2019
Sprache Englisch
Identifikator KITopen-ID: 1000098701
Veranstaltung 46th Leeds-Lyon Symposium on Tribology (2019), Lyon, Frankreich, 02.09.2019 – 04.09.2019
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