Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 22: Poster Monday: Surface Structure, Epitaxy, Growth and Tribology

O 22.2: Poster

Montag, 5. September 2022, 18:00–20:00, P4

Interactions between bovine calf serum and metallic surface of hipimplant taper junctions — •Adrian Wittrock¹, Saskia Heermant¹, Christian Beckmann¹, Markus A. Wimmer², Alfons Fischer^2,3, and Jörg Debus¹ — ¹Experimental Physics 2, TU Dortmund University, Dortmund, Germany — ²Department of Orthopedic Surgery, Rush University Medical Center, Chicago, USA — ³Department Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf, Germany

Within biomedical taper junctions metal surfaces interact with the human body fluid and sustain structural and chemical changes which are of particular interest from the medical and engineering point of view. To simulate the tribological contact of a hip implant taper junction, fretting tests of low-carbon CoCrMo alloys and high-nitrogen FeCrMnMoN steels are performed in bovine calf serum under different numbers of cycles. We investigate structural and chemical variations within the fretting contact by means of label-free and non-destructive Raman spectroscopy. A different absorption behavior of long-chained molecules is observed and the amide I band is shifted from 1655 cm⁻¹ to about 1665 cm⁻¹, which indicates that once a protein is bound to the surface the conformation changes from α-helix to a random or β-sheet structure. A general denaturation of proteins occurs during the fretting experiment. At the heavily worn sample positions lipids are not detected, but sp²-hybridized amorphous carbon is sometimes measured. Our results contribute to a deeper understanding about structural and chemical properties of biomedical tribological surfaces.