On the Ni-Ion release rate from surfaces of binary NiTi shape memory alloys

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Authors

ŠEVČÍKOVÁ Jana BÁRTKOVÁ Denisa PÁVKOVÁ GOLDBERGOVÁ Monika KUBĚNOVÁ Monika ČERMÁK JIří FRENZEL Jan WEISER Adam DLOUHÝ Antonín

Year of publication 2018
Type Article in Periodical
Magazine / Source Applied Surface Science
MU Faculty or unit

Faculty of Medicine

Citation
Doi http://dx.doi.org/10.1016/j.apsusc.2017.08.235
Field Physiology
Keywords Hydrogen soaking; Ni-ion release; NiTi bio-compatibility; NiTi surface passivation; Scanning transmission electron microscopy
Description The study is focused on Ni-ion release rates from NiTi surfaces exposed in the cell culture media and human vascular endothelial cell (HUVEC) culture environments. The NiTi surface layers situated in the depth of 70 um below a NiTi oxide scale are affected by interactions between the NiTi alloys and the bio-environments. The finding was proved with use of inductively coupled plasma mass spectrometry and electron microscopy experiments. As the exclusive factor controlling the Ni-ion release rates was not only thicknesses of the oxide scale, but also the passivation depth, which was two-fold larger. Our experimental data strongly suggested that some other factors, in addition to the Ni concentration in the oxide scale, admittedly hydrogen soaking deep below the oxide scale, must be taken into account in order to rationalize the concentrations of Ni-ions released into the bio-environments. The suggested role of hydrogen as the surface passivation agent is also in line with the fact that the Ni-ion release rates considerably decrease in NiTi samples that were annealed in controlled hydrogen atmospheres prior to bio-environmental exposures.
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