NDLI: Assessment and comparison of surface chemical composition and oxide layer modification upon two different activation methods on a cocrmo alloy

Content Provider	Springer Nature Link
Author	Paredes, Viriginia Salvagni, Emilia Rodriguez, Enrique Gil, F. Javier Manero, Jose Maria
Copyright Year	2013
Abstract	This study investigated the effect of two different activation methods on the surface chemical composition of a CoCrMo-alloy. The activation was performed with oxygen plasma (OP) or nitric acid (NA). The surface physical–chemical properties were thoroughly characterized by means of several analytical techniques: X-ray photoelectron spectroscopy (XPS), time-of-flight secondary ion mass spectrometry (ToF-SIMS), zinc-complex substitution technique, contact angle, and interferometry. The surface modification was evaluated by assessing contamination removal, the “active” hydroxyl groups (OH-act) present at the surface, the metal oxide ratio (Co$_{y}$O x − /Cr$_{y}$O x − ) and changes in the chemical composition and topography of the oxide layer. XPS experimental data showed for both methods (OP and NA) a significant decrease of the carbon contents (C 1s) associated with contaminants and at the same time changes in the atomic composition of the oxide layer (O 1s). In addition, the O 1s XPS spectra showed differences between the percentage of OH$^{−}$ before and after OP or NA treatment, leading to the conclusion that both methods are effective for surface “cleaning” and activation. These results were further investigated and corroborated by ToF-SIMS analysis and zinc complex substitution technique. The general conclusion was that NA is more efficient in terms of contaminants removal and generation of accessible OH-act present at the surface and without altering the native metal oxide ratio (Co$_{y}$O x − /Cr$_{y}$O x − ) considered to be essential for biocompatibility.
Starting Page	311
Ending Page	320
Page Count	10
File Format	PDF
ISSN	09574530
Journal	Journal of Materials Science: Materials in Medicine
Volume Number	25
Issue Number	2
e-ISSN	15734838
Language	English
Publisher	Springer US
Publisher Date	2013-11-08
Publisher Place	Boston
Access Restriction	Subscribed
Subject Keyword	Biomaterials Polymer Sciences Ceramics, Glass, Composites, Natural Methods Metallic Materials Characterization and Evaluation of Materials Surfaces and Interfaces, Thin Films
Content Type	Text
Resource Type	Article
Subject	Biomaterials Biophysics Bioengineering Biomedical Engineering

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