Colloidal particle based electrodeposition coatings on NiTi alloy: Reduced releasing of nickel ions and improved biocompatibility

2018 ◽  
Vol 230 ◽  
pp. 228-231 ◽  
Author(s):  
Long Meng ◽  
Yang Li ◽  
Kai Pan ◽  
Ye Zhu ◽  
Wei Wei ◽  
...  
Keyword(s):  
Colloidal Particle ◽  
Niti Alloy ◽  
Nickel Ions

scholarly journals Nickel-Catcher-Doped Zwitterionic Hydrogel Coating on Nickel–Titanium Alloy Toward Capture and Detection of Nickel Ions

2021 ◽  
Vol 9 ◽  
Author(s):  
Xiaoyi Fu ◽  
Xi Liu ◽  
Dezhao Hao ◽  
Wuyi Xiao ◽  
Qiong Nie ◽  
...  
Keyword(s):  
Medical Devices ◽  
Niti Alloy ◽  
Nickel Titanium ◽  
Cytotoxic Activities ◽  
Ion Leakage ◽  
Nickel Ion ◽  
Nickel Ions ◽  
Potential Possibility ◽  
Bacteria Adhesion ◽  
Chelation Reaction

Nickel–titanium (NiTi) alloys show broad applicability in biomedical fields. However, the unexpected aggregation of bacteria and the corrosion of body fluid on NiTi-based medical devices often lead to the leakage of nickel ions, resulting in inevitable allergic and cytotoxic activities. Therefore, the capture and detection of nickel ions are important to avoid serious adverse reactions caused by NiTi-based medical devices. Herein, we presented a nickel ion capture strategy by the combination of zwitterionic hydrogels as anti-bacteria layers and carbon disulfide (CS2) components as nickel-catchers (Ni-catchers). On the one hand, the hydration layer of zwitterionic hydrogel can efficiently inhibit bacteria adhesion and reduce nickel ions leakage from NiTi corrosion. On the other hand, Ni-catchers can capture leaked nickel ions from NiTi alloy actively by chelation reaction. Therefore, this strategy shows great capabilities in resisting bacteria adhesion and capturing nickel ions, providing the potential possibility for the detection of nickel ion leakage for implantable biomedical materials and devices.

scholarly journals A Critical Appraisal of the Use and Properties of Nickel–Titanium Dental Alloys

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7859
Author(s):  
Petra Močnik ◽  
Tadeja Kosec
Keyword(s):  
Metal Ions ◽  
Human Body ◽  
Niti Alloy ◽  
Nickel Titanium ◽  
Stable Steady State ◽  
Corrosion Properties ◽  
Nickel Ions ◽  
Corrosion Resistant Alloy ◽  
Subsequent Effect ◽  
Niti Wires

Nickel–titanium (NiTi) archwires are used in dentistry for orthodontic treatment. NiTi alloys have favourable mechanical characteristics, such as superelasticity and shape memory, and are also known as a corrosion-resistant alloy. In specific cases, an archwire could be attacked by certain types of corrosion or wear degradation, which can cause the leaching of metal ions and a hypersensitive response due to increased concentrations of Ni in the human body. A systematic search of the literature retrieved 102 relevant studies. The review paper focuses on three main fields: (i) electrochemical properties of NiTi wires and the effect of different environments on the properties of NiTi wires (fluoride and low pH); (ii) tribocorrosion, a combination of chemical and mechanical wear of the material, and (iii) the biocompatibility of NiTi alloy and its subsequent effect on the human body. The review showed that corrosion properties are affected by microstructure, pH of saliva and the presence of fluorides. A high variation in published results should be, therefore, interpreted with care. The release of nickel ions was assessed using the same unit, showing that the vast majority of metal ions were released in the first few days of exposure, then a stable, steady state was reached. In tribocorrosion studies, the increased concentrations of Ni ions were reported.

Formation of Porous (Ca, P)-Doped TiO2/Dense Ti Double Coatings on NiTi Alloy

2011 ◽  
Vol 675-677 ◽  
pp. 333-336 ◽  
Author(s):  
Hong Zhao ◽  
Cui Cui Tian ◽  
Guo Qiang Lin ◽  
Zhen Dong Ge ◽  
Min Qi ◽  
...  
Keyword(s):  
Electron Probe ◽  
Niti Alloy ◽  
Good Combination ◽  
X Ray Diffraction ◽  
Nickel Ions ◽  
Doped Tio2 ◽  
X Ray ◽  
Ion Plating ◽  
Micro Arc Oxidation ◽  
Duplex Process

NiTi alloys are widely used for bone implants due to their good mechanical properties. However, they can suffer certain disadvantages, such as leaching of toxic nickel ions and poor osteoinductive properties. A porous (Ca, P)-doped TiO2 /dense Ti double coatings on NiTi alloy with porous (Ca, P)-doped TiO2 coating as the top layer and a dense Ti coating as the interlayer should possess a very good combination of bioactivity and chemical stability. In this paper, the double coatings were formed by applying a duplex process of arc ion plating (AIP) and micro-arc oxidation (MAO). X-ray diffraction (XRD), scanning electron microscopy (SEM) and electron probe microanalysis (EPMA) have been used to investigate the microstructure and morphology of the coatings.

scholarly journals Deposition of Chitosan Layers on NiTi Shape Memory Alloy

2015 ◽  
Vol 60 (1) ◽  
pp. 171-176 ◽  
Author(s):  
P. Kowalski ◽  
B. Łosiewicz ◽  
T. Goryczka
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Niti Alloy ◽  
Intermetallic Phase ◽  
Protective Role ◽  
Niti Shape Memory Alloy ◽  
Titanium Nitrides ◽  
Nickel Ions ◽  
Surface Protection ◽  
Deposition Parameters

Abstract The NiTi shape memory alloys have been known from their application in medicine for implants as well as parts of medical devices. However, nickel belongs to the family of elements, which are toxic. Apart from the fact that nickel ions are bonded with titanium into intermetallic phase, their presence may cause allergy. In order to protect human body against release of nickel ions a surface of NiTi alloy can be modified with use of titanium nitrides, oxides or diamond-like layers. On the one hand the layers can play protective role but on the other hand they may influence shape memory behavior. Too stiff or too brittle layer can lead to limiting or completely blocking of the shape recovery. It was the reason to find more elastic covers for NiTi surface protection. This feature is characteristic for polymers, especially, biocompatible ones, which originate in nature. In the reported paper, the chitosan was applied as a deposited layer on surface of the NiTi shape memory alloy. Due to the fact that nature of shape memory effect is sensitive to thermo and/or mechanical treatments, the chitosan layer was deposited with use of electrophoresis carried out at room temperature. Various deposition parameters were checked and optimized. In result of that thin chitosan layer (0.45µm) was received on the NiTi alloy surface. The obtained layers were characterized by means of chemical and phase composition, as well as surface quality. It was found that smooth, elastic surface without cracks and/or inclusions can be produced applying 10V and relatively short deposition time - 30 seconds.

ELECTROLESS NICKEL

Alloy Digest ◽  
1986 ◽  
Vol 35 (4) ◽  
Keyword(s):  
Nickel Coating ◽  
Chemical Reduction ◽  
Electroless Nickel ◽  
Heat Treating ◽  
Corrosion And Wear ◽  
Sodium Hypophosphite ◽  
Work Piece ◽  
Nickel Ions ◽  
Continuous Contact ◽  
Chemical Corporation

Abstract ELECTROLESS NICKEL is a nickel coating deposited by chemical reduction of nickel ions. The most widely used reducing agent is sodium hypophosphite. The thickness of the deposited coating is uniform over all areas of the work-piece that are in continuous contact with fresh plating solution. The process is applicable to a wide variety of metal and nonmetal substrates. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion and wear resistance as well as heat treating and joining. Filing Code: Ni-332. Producer or source: Occidental Chemical Corporation.

The Binding and Viscometric Studies of Ni+2, Co+2 and Mn+2 Ions with Protein by Spectrometric and pH Metric Techniques

2019 ◽  
Vol 9 (2) ◽  
pp. 151-162
Author(s):  
Shveta Acharya ◽  
Arun Kumar Sharma
Keyword(s):  
Metal Ions ◽  
Metal Ion ◽  
Protein Molecule ◽  
Vital Role ◽  
Sufficient Evidence ◽  
Structural Requirement ◽  
Nickel Ions ◽  
Cobalt Ions ◽  
Lower Temperature ◽  
Specific Oxidation

Background: The metal ions play a vital role in a large number of widely differing biological processes. Some of these processes are quite specific in their metal ion requirements. In that only certain metal ions, in specific oxidation states, can full fill the necessary catalytic or structural requirement, while other processes are much less specific. Objective: In this paper we report the binding of Mn (II), Ni (II) and Co (II) with albumin are reported employing spectrophotometric and pH metric method. In order to distinguish between ionic and colloidal linking, the binding of metal by using pH metric and viscometric methods and the result are discussed in terms of electrovalent and coordinate bonding. Methods: The binding of Ni+2, Co+2 and Mn+2 ions have been studied with egg protein at different pH values and temperatures by the spectrometric technique. Results: The binding data were found to be pH and temperature dependent. The intrinsic association constants (k) and the number of binding sites (n) were calculated from Scatchard plots and found to be at the maximum at lower pH and at lower temperatures. Therefore, a lower temperature and lower pH offered more sites in the protein molecule for interaction with these metal ions. Statistical effects seem to be more significant at lower Ni+2, Co+2 and Mn+2 ions concentrations, while at higher concentrations electrostatic effects and heterogeneity of sites are more significant. Conclusion: The pH metric as well as viscometric data provided sufficient evidence about the linking of cobalt, nickel and manganese ions with the nitrogen groups of albumin. From the nature and height of curves in the three cases it may be concluded that nickel ions bound strongly while the cobalt ions bound weakly.

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