Diamond-like carbon films for polyethylene femoral parts: Raman and FT-IR spectroscopy before and after incubation in simulated body liquid |
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Authors: | A Dorner-Reisel G Gärtner G Reisel G Irmer |
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Institution: | 1.FMTC e.V.: F?rderung der Materialentwicklung & Technologie Chemnitz e.V.,Chemnitz,Germany;2.Institute for Theoretical Physics,TU Bergakademie Freiberg,Freiberg,Germany;3.Institute of Experimental Physics,TU Bergakademie Freiberg,Freiberg,Germany;4.Sulzer Metco WOKA GmbH,Barchfeld,Germany |
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Abstract: | In artificial prosthetics for knee, hip, finger or shoulder joints, ultrahigh molecular weight polyethylene (UHMW-PE) is a
significant material. Several attempts to reduce the wear rate of UHMW-PE, i.e. the application of suitable coatings, are
in progress. A surface modification of polyethylene with wear-resistant hydrogenated diamond-like carbon is favourable, owing
to the chemical similarity of polyethylene (–C–H2–)
n
and C:H or amorphous C:H (a–C:H) coatings with diamond-like properties. In the present study, the microstructure of a–C:H
coatings on UHMW-PE substrates was investigated by Raman and Fourier transform infrared (FT-IR) spectroscopy. FT-IR spectroscopy
shows very broad absorption lines, which point to the disorder and diversity of different symmetric, asymmetric aromatic,
olefin sp
2-hybridized or sp
3-hybridized C–H groups in the amorphous diamond-like carbon coating. Following a long incubation of 12 months in a simulated
body liquid, the structural investigations were repeated. Furthermore, fractured cross-sections and the wetting behaviour
with polar liquids were examined. After incubation in simulated body liquid, Raman spectroscopy pointed to a reduction of
the C–H bonds in the diamond-like carbon coatings. On the basis of these findings, one can conclude that hydrogenated diamond-like
carbon is able to interact with salt solutions by substituting the hydrogen with appropriate ions. |
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Keywords: | Diamond-like carbon Ultrahigh molecular weight polyethylene Raman spectroscopy Fourier transform infrared spectroscopy |
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