<i>In vitro</i> corrosion study by EIS of an equiatomic NiTi alloy and an implant quality AISI 316 stainless steel

Rondelli, G.; Torricelli, Paola; Fini, Milena; Rimondini, Lia; Giardino, Roberto

doi:10.1002/jbm.b.30545

Cited by 30 publications

(41 citation statements)

References 13 publications

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“…The advantage of the EIS technique lies in the fact that it provides information on the corrosion resistance of electrodes and the electrode-solution interface under nearly nonpolarizing conditions. 26 The fitted curves were obtained using the R s (Q p (R p (Q b R b ))) model with two different time constants that control the corrosion mechanism for LM1, LM1b, and pure Zr, and this model is based on a two-layer structure of an oxide film: an inner zone representing a barrier-type compact film and an outer zone representing a relatively porous and unsealed film. 27 As for pure Ti and LM106, the R s (Q p R p ) model with only one time constant was used, based on a one layer structure.…”

Section: Corrosion Behaviormentioning

confidence: 99%

In vitro study on Zr‐based bulk metallic glasses as potential biomaterials

et al. 2010

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With pure Ti and pure Zr as controls, the corrosion resistance, ion release behavior, and in vitro biocompatibility of Be-containing Zr₄₁Ti₁₄Cu₁₂Ni₁₀Be₂₃ bulk metallic glass (BMG) (LM1), Zr₄₄Ti₁₁Cu₁₀Ni₁₀Be₂₅ BMG (LM1b), and Be-free Zr₅₇Nb₅Cu₁₅.₄Ni₁₂.₆Al₁₀ BMG (LM106) were investigated in terms of electrochemical measurements in simulated body fluid (SBF) with pH value 7.4 and artificial saliva (AS) with pH value 6.3, and 3-[4,4-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide (MTT) assay using L929 and NIH3T3 cells, aiming to assess the feasibility of Zr-based BMGs as potential biomaterial. It was found that LM1b showed superior corrosion resistance to LM106 and LM1 in both SBF and AS, and comparable with pure Ti and pure Zr. After 7200 s immersion, a two-layer structure oxide film was formed on LM1, LM1b, and pure Zr surfaces, while one-layer structure oxide film was formed on LM106 and pure Ti surfaces. The pitting corrosion potentials of LM1b were much higher than that of LM1, LM106, and pure Zr, resulting in very few ions releasing into the electrolytes. No Be ion could be detected but a little amount of Cu ion was detected for LM106, LM1, and LM1b after immersion in Dulbecco's modified Eagle's medium for 72 h at 37 °C. The indirect cytotoxicity results show that LM106, LM1, and LM1b extracts had no cytotoxicity to L929 and NIH3T3 cells. The direct cytotoxicity results show that cells could adhere well on the Zr-based BMG surface as in pure Ti and Zr. Lower cell proliferation rate of LM106 and LM1 is observed when compared with LM1b, which was found to be caused by Cu ion releasing rather than by Be ion.

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Section: Corrosion Behaviormentioning

confidence: 99%

In vitro study on Zr‐based bulk metallic glasses as potential biomaterials

et al. 2010

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“…The inner barrier layer has a high corrosion resistance. [22,30,31,38] The outer porous layer is heterogeneous and has a low resistance. Defects of the unsealed surface are filled with electrolyte.…”

Section: Equivalent Circuit -Modelling the Interfacementioning

confidence: 99%

“…Defects of the unsealed surface are filled with electrolyte. [30][31][32]38] While the corrosion resistance is attributed to the inner layer, the ability of tissue integration should be ascribed to the porous outer layer. [39] The oxide layer capacitance C p is inversely proportional to the oxide layer thickness d = A e 0 e r /C p , with A being the oxide layer surface, e r the relative static permittivity of the oxide film, and e 0 the electric constant.…”

Section: Equivalent Circuit -Modelling the Interfacementioning

confidence: 99%

“…[44] The impedance of metals in contact with an electrolyte increases when proteins are added. [5,33,38] Hiromoto et al [2] observed that addition of fetal bovine serum (FBS in Fig. 4 at a titanium oxide layer leads to a plateau in the impedance curve at low frequencies.…”

Section: Influence Of Proteins On the Electrochemical Properties Of Tmentioning

confidence: 99%

“…[57] Hence, the impedance increases when cells attach at the surface. [38,50] The increasing impedance is a measure of confluence of the cells. [1] The measured impedance mainly results from capacitive effects of the oxide layer and the cells.…”

Section: Cell Mobility Resistance and Impedance Measurementsmentioning

confidence: 99%

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Biomaterial Interface Investigated by Electrochemical Impedance Spectroscopy

2008

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Electrochemical impedance spectroscopyElectrochemical impedance spectroscopy is an easy applicable sensitive technique. It is used to get information about the adsorption behaviour and the interactions of biomolecules with the electrode surface in a short measurement duration. Electrochemical processes can be modelled by an equivalent circuit and various parameters reflecting certain properties of the interface can be determined. The electrochemical properties of the interface are influenced by proteins and cells adsorbing at the surface. Different modified surfaces can be analyzed before, during, and after cell contact, respectively. Applying bias potentials also changes the behaviour of attaching cells and proteins. Changes in the medium composition have an influence on the electrochemically detectable surface properties.Biosensors are developed consecutively to detect biomolecules. Enzymes, lipids and membranes can be analyzed and the adsorption behaviour of DNA and antigens at modified electrode surfaces can be determined. Different technologies using microchips were constructed to allow a fast screening of electrochemical properties and discrimination of biological molecules or cells. ApplicationElectrochemical impedance spectroscopy serves not only for determination of the capacity of new battery materials or corrosion behaviour and long term stability of diverse alloys and oxide layers, it can also be used to gain information about biomolecules. The adsorption behaviour of cells [1][2][3] and proteins, [4] the amount of adsorbed proteins, [4][5][6][7] surface charge densities [4][5][6] and adsorption coefficients [5] can be determined. Interactions of implant surfaces with biological devices, changes in the polarizability of functional groups, the transport of ions or dipoles through polymer layers and mineralization processes, for instance of bone tissue can be assessed. The change of the Gibbs free energy and the entropy due to protein binding to the surface can be calculated [4,6,8] and the affinity of biomolecules to the surface can be estimated. [4] Electrochemical techniques are introduced as biosensors. Antigens, ssDNA or enzymes are immobilized at the surface and according antibodies, DNA and distinct proteins can be ADVANCED ENGINEERING MATERIALS 2008, 10, No. 10

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The electrochemical behavior of nitinol in simulated physiological solutions

Pound

2007

J Biomedical Materials Res

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The electrochemical behavior of nitinol in simulated human bile and phosphate-buffered saline (PBS) was examined using electrochemical impedance spectroscopy. In addition, cyclic potentiodynamic polarization tests were performed in the simulated bile and salt-only bile, and the results compared with those obtained previously in PBS. The potentiodynamic tests showed that electropolishing was effective in providing nitinol with a high resistance to pitting corrosion in the bile solutions, as found in PBS. Differences between the breakdown potential and the corrosion potential indicated that mechanically polished nitinol should be more susceptible to pitting corrosion in simulated bile than in the salt-only bile and PBS. The impedance spectra showed near-capacitive behavior in both PBS and simulated bile, and the data could be fitted by a parallel resistance-capacitance (as a constant phase element) circuit associated with the passive oxide film. The thickness of the oxide was determined from the capacitive component and found to be consistent with surface analytical results reported in the literature. Resistivities obtained from resistance values indicated that compositional features of the oxide were similar for PBS and simulated bile.

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In vitro corrosion study by EIS of an equiatomic NiTi alloy and an implant quality AISI 316 stainless steel

Cited by 30 publications

References 13 publications

In vitro study on Zr‐based bulk metallic glasses as potential biomaterials

In vitro study on Zr‐based bulk metallic glasses as potential biomaterials

Biomaterial Interface Investigated by Electrochemical Impedance Spectroscopy

The electrochemical behavior of nitinol in simulated physiological solutions

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