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Arsenic contamination of coarse‐grained and nanostructured nitinol surfaces induced by chemical treatment in hydrofluoric acid
Author(s) -
Korotin D. M.,
Bartkowski S.,
Kurmaev E. Z.,
Borchers C.,
Müller M.,
Neumann M.,
Gunderov D. V.,
Valiev R. Z.,
Cholakh S. O.
Publication year - 2012
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.32748
Subject(s) - hydrofluoric acid , x ray photoelectron spectroscopy , materials science , nickel titanium , chemical state , arsenic , contamination , surface roughness , chemical engineering , metallurgy , composite material , shape memory alloy , biology , ecology , engineering
XPS measurements of coarse‐grained and nanostructured nitinol (Ni 50.2 Ti 49.8 ) before and after chemical treatment in hydrofluoric acid (40% HF, 1 min) are presented. The nanostructured state, providing the excellent mechanical properties of nitinol, is achieved by severe plastic deformation. The near‐surface layers of nitinol were studied by XPS depth profiling. According to the obtained results, a chemical treatment in hydrofluoric acid reduces the thickness of the protective TiO 2 oxide layer and induces a nickel release from the nitinol surface and an arsenic contamination, and can therefore not be recommended as conditioning to increase the roughness of NiTi‐implants. A detailed evaluation of the resulting toxicological risks is given. © 2012 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2012.