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Observing the adsorption process of friction modifier additives by combination of quartz crystal microbalance (QCM-D) and confocal laser scanning microscopy (CLSM)

Eickworth, Jennifer; Dienwiebel, Martin; Rühle, Thomas; Wilke, Patrick

Abstract (englisch):
Friction modifier additive technologies play a crucial role in minimizing friction and wear of lubricated tribological systems. Present efforts to improve the energy efficiency and new regulations require a fundamental understanding of the adsorption processes. Therefore in-situ and oil compatible methods are needed.
This work combines the in-situ measurement of friction modifier additives deposition onto a surface and the resulting viscoelastic properties (using a quartz crystal microbalance with dissipation, QCM-D) with the imaging of the deposition process employing a fluorescence confocal laser scanning microscope CLSM). This approach enabled us to for the first time to observe the deposition in-situ.
Contrary to the common assumption present for almost 100 years that friction modifiers form monolayers, our CLSM-study shows that friction modifiers can also forms droplets in the mineral base oil and subsequently stay in the shape of a droplet after deposition on the Fe2O3 surface. The adsorbed droplets have diameters between < 1 µm and 127 µm. Small droplets are not mobile after deposition, but droplets with a certain diameter become mobile and move along the surface to merge with other mostly smaller droplets. ... mehr

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Volltext (Version 2) §
DOI: 10.5445/IR/1000122662/v2
Veröffentlicht am 23.02.2021
Volltext (Version 1) §
DOI: 10.5445/IR/1000122662
Veröffentlicht am 14.08.2020
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Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Computational Materials Science (IAM-CMS)
Publikationstyp Forschungsbericht/Preprint
Publikationsdatum 13.08.2020
Sprache Englisch
Identifikator KITopen-ID: 1000122662
Bemerkung zur Veröffentlichung Eingereicht bei Tribology Letters
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