Ion Release and Surface Characterization of Nanostructured Nitinol during Long-Term Testing

Nasakina, E. O.; Sudarchikova, M. A.; Sergienko, K. V.; Konushkin, S. V.; Sevostyanov, M. A.

doi:10.3390/nano9111569

Cited by 30 publications

(20 citation statements)

References 83 publications

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“…More Ni ions were released from the alloy prepared using the elementally blended powders than from the alloy produced from the pre-alloyed powder. The amount of released Ni ions is related to the stability and thickness of the oxide film formed on the surface, which was previously shown by Shabalovskaya et al [43] and Nasakina et al [44]. Three factors are expected to suppress the leaching of Ni ions from the coupons produced using a mixture of pure Ni and pure Ti during the immersion.…”

Section: Discussionmentioning

confidence: 74%

Biological and Corrosion Evaluation of In Situ Alloyed NiTi Fabricated through Laser Powder Bed Fusion (LPBF)

Chmielewska

Dobkowska

Kijeńska‐Gawrońska

et al. 2021

IJMS

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In this work, NiTi alloy parts were fabricated using laser powder bed fusion (LBPF) from pre-alloyed NiTi powder and in situ alloyed pure Ni and Ti powders. Comparative research on the corrosive and biological properties of both studied materials was performed. Electrochemical corrosion tests were carried out in phosphate buffered saline at 37 °C, and the degradation rate of the materials was described based on Ni ion release measurements. Cytotoxicity, bacterial growth, and adhesion to the surface of the fabricated coupons were evaluated using L929 cells and spherical Escherichia coli (E. coli) bacteria, respectively. The in situ alloyed NiTi parts exhibit slightly lower corrosion resistance in phosphate buffered saline solution than pre-alloyed NiTi. Moreover, the passive layer formed on in situ alloyed NiTi is weaker than the one formed on the NiTi fabricated from pre-alloyed NiTi powder. Furthermore, in situ alloyed NiTi and NiTi made from pre-alloyed powders have comparable cytotoxicity and biological properties. Overall, the research has shown that nitinol sintered using in situ alloyed pure Ni and Ti is potentially useful for biomedical applications.

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Section: Discussionmentioning

confidence: 74%

Biological and Corrosion Evaluation of In Situ Alloyed NiTi Fabricated through Laser Powder Bed Fusion (LPBF)

Chmielewska

Dobkowska

Kijeńska‐Gawrońska

et al. 2021

IJMS

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“…Recently, a few attempts have also been proposed to attain surface modifications of nitinol-based materials thus mitigating the risks associated with the presence of a potentially toxic, allergenic and carcinogenic component, i.e. nickel [17][18][19][20].…”

Section: Shape Memory Alloys (Smas)mentioning

confidence: 99%

Shape memory materials and 4D printing in pharmaceutics

Melocchi

Uboldi

Cerea

et al. 2021

Advanced Drug Delivery Reviews

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“…Another path leading to the accumulation of Ni in the surface layers can be the type of surface treatment itself. Low-temperature (60-160 • C) pre-treatment protocols or high-temperature annealing in the air used for deposition of a thick TiO 2 layer onto a Nitinol surface results in Ni accumulation in the surface depth [11][12][13]. This hidden Ni can easily be released through the defective surfaces, exceeding the Ni release from nontreated material by two to three orders of magnitude.…”

Section: Introductionmentioning

confidence: 99%

Atomic Layer Deposition of aTiO2 Layer on Nitinol and Its Corrosion Resistance in a Simulated Body Fluid

Rudolf

Stambolić

Kocijan

2021

Metals

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Nitinol is a group of nearly equiatomic alloys composed of nickel and titanium, which was developed in the 1970s. Its properties, such as superelasticity and Shape Memory Effect, have enabled its use, especially for biomedical purposes. Due to the fact that Nitinol exhibits good corrosion resistance in a chloride environment, an unusual combination of strength and ductility, a high tendency for self-passivation, high fatigue strength, low Young’s modulus and excellent biocompatibility, its use is still increasing. In this research, Atomic Layer Deposition (ALD) experiments were performed on a continuous vertical cast (CVC) NiTi rod (made in-house) and on commercial Nitinol as the control material, which was already in the rolled state. The ALD deposition of the TiO2 layer was accomplished in a Beneq TFS 200 system at 250 °C. The pulsing times for TiCl4 and H2O were 250 ms and 180 ms, followed by appropriate purge cycles with nitrogen (3 s after the TiCl4 and 2 s after the H2O pulses). After 1100 repeated cycles of ALD depositing, the average thickness of the TiO2 layer for the CVC NiTi rod was 52.2 nm and for the commercial Nitinol, it was 51.7 nm, which was confirmed by X-ray Photoelectron Spectroscopy (XPS) and Scanning Electron Microscope (SEM) using Energy-dispersive X-ray (EDX) spectroscopy. The behaviour of the CVC NiTi and commercial Nitinol with and without the TiO2 layer was investigated in a simulated body fluid at body temperature (37 °C) to explain their corrosion resistance. Potentiodynamic polarisation measurements showed that the lowest corrosion current density (0.16 μA/cm2) and the wider passive region were achieved by the commercial NiTi with TiO2. Electrochemical Impedance Spectroscopy measurements revealed that the CVC NiTi rod and the commercial Nitinol have, for the first 48 h of immersion, only resistance through the oxide layer, as a consequence of the thin and compact layer. On the other hand, the TiO2/CVC NiTi rod and TiO2/commercial Nitinol had resistances through the oxide and porous layers the entire immersion time since the TiO2 layer was formatted on the surfaces.

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Ion Release and Surface Characterization of Nanostructured Nitinol during Long-Term Testing

Cited by 30 publications

References 83 publications

Biological and Corrosion Evaluation of In Situ Alloyed NiTi Fabricated through Laser Powder Bed Fusion (LPBF)

Biological and Corrosion Evaluation of In Situ Alloyed NiTi Fabricated through Laser Powder Bed Fusion (LPBF)

Shape memory materials and 4D printing in pharmaceutics

Atomic Layer Deposition of aTiO2 Layer on Nitinol and Its Corrosion Resistance in a Simulated Body Fluid

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