Growth and Electrochemical Stability of Compact Tantalum Oxides Obtained in Different Electrolytes for Biomedical Applications

Namur, Ricardo Sanson; Leiva, Karla Miriam Reyes; Marino, Cláudia Eliana Bruno

doi:10.1590/1516-1439.348714

Cited by 23 publications

(16 citation statements)

References 26 publications

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“…As a biocompatible metal, tantalum has been studied for many biomaterial applications, where biocompatibility and outstanding corrosion resistance even in acidic media are required [ 88 ]. The anticorrosion properties of tantalum are due to the stable, native Ta 2 O 5 protective film formed on the implant surface [ 89 , 90 ].…”

Section: Permanent Metallic Implantsmentioning

confidence: 99%

Metallic Biomaterials: Current Challenges and Opportunities

et al. 2017

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Metallic biomaterials are engineered systems designed to provide internal support to biological tissues and they are being used largely in joint replacements, dental implants, orthopaedic fixations and stents. Higher biomaterial usage is associated with an increased incidence of implant-related complications due to poor implant integration, inflammation, mechanical instability, necrosis and infections, and associated prolonged patient care, pain and loss of function. In this review, we will briefly explore major representatives of metallic biomaterials along with the key existing and emerging strategies for surface and bulk modification used to improve biointegration, mechanical strength and flexibility of biometals, and discuss their compatibility with the concept of 3D printing.

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Section: Permanent Metallic Implantsmentioning

confidence: 99%

Metallic Biomaterials: Current Challenges and Opportunities

et al. 2017

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“…The importance of receiving Ta 2 O 5 and not TaO 2 or TaO is further underscored by previous research which shows that the later are susceptible to dissolution when in contact with acids H 2 SO 4 . [53,54] Deconvolution of the high-resolution Mo 3d core electron XPS spectra in Figure S6 shows that all samples contained Mo existing on the surface in five different oxidation states, summarized in Table S4. A significant amount of molybdenum oxide phases on the surface of all samples is expected and explained by its spontaneous oxidation upon exposure to air.…”

Section: Effect Of Ta Sputtering On Forced Anodic Corrosionmentioning

confidence: 99%

Improved Durability and Activity in Pt/Mo₂C Fuel Cell Cathodes by Magnetron Sputtering of Tantalum

Hamo

Rosen

2021

ChemElectroChem

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Cost reduction together with durability represent the primary challenges for cathode catalysts in polymer electrolyte membrane fuel cells (PEMFCs). The catalyst is often supported by carbon, which suffers from parasitic corrosion, particularly during start‐up and shut‐down operations. Transition metal carbides (TMCs) have attracted attention as a potential replacement for carbon supports because some of them have electronic structures likened to noble metals. Mo2C has shown promising activity as platinum support for the oxygen reduction reaction (ORR) but can suffer from oxidation and dissolution. Here, Mo2C supports are modified by surface tantalum (Ta) treatment using a variety of DC magnetron sputtering operating parameters. All supports modified by Ta showed improved corrosion resistance compared to the untreated support. Pt/Mo2C modified with Ta using a 500 V bias, 6 mTorr working pressure, and 2 min sputter time additionally showed improved kinetic current density and mass activity. Ta sputtering under these conditions were applied to the cathode side of a Pt/Mo2C membrane electrode assembly and showed significantly improved durability when subjected to an accelerated stress test. Ta‐modified Pt/Mo2C cathodes showed resistance to void formation and loss of electrochemical surface area. Ta magnetron sputtering can therefore be considered a viable surface treatment for improving the activity and stability of PEMFCs using Mo2C‐based supports.

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“…The earlier studies on Ta-based coatings suggested that the Ta-oxide content in the coating was advantageous for the improved corrosion resistance and biological properties of the surface. [35][36][37] With an increase in Ta reinforcement in HA coating, the amorphous hump corresponding to b-TCP reduced and the peaks corresponding to TTCP also lowered. The overall intensity of HA peaks increased marginally with an increase in Ta reinforcement in HA.…”

Section: Electrochemical Corrosion Analysismentioning

confidence: 99%

Analysis of corrosion behaviour and surface properties of plasma-sprayed composite coating of hydroxyapatite–tantalum on biodegradable Mg alloy ZK60

Singh

Sidhu

2019

Journal of Composite Materials

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Magnesium (Mg) and its alloys are promising candidates for biodegradable bio-implants. However, the excessive corrosion in the physiological environment and subsequent decline in the mechanical integrity of Mg and its alloys have limited their utility as biomaterials. In the present study, an attempt has been made to improve the corrosion resistance of Mg alloy ZK60 plasma sprayed with tantalum (Ta)-reinforced hydroxyapatite coating. The experiment was conducted with three varied levels, i.e. 10, 20 and 30 weight percent (wt%) of Ta-content in hydroxyapatite coating. The coatings were characterized and in vitro corrosion behaviour was investigated by electrochemical measurements in Ringer's solution along with the analysis of surface properties. The corrosion resistance of the Mg alloy increased with the incremental increase in Ta reinforcement in hydroxyapatite coating. An increase in the protection efficiency was analysed for the Ta-reinforced hydroxyapatite coatings (∼10%, 18% and 23% for hydroxyapatite-10Ta, hydroxyapatite-20Ta and hydroxyapatite-30Ta, respectively) as compared to the pure hydroxyapatite coating. The hydroxyapatite coating effectively increased the surface hardness of the Mg alloy and Ta reinforcement further enhanced it. Surface roughness decreased with the incremental increase in Ta-content in hydroxyapatite coating. Wettability analysis revealed the hydrophilic nature of pure hydroxyapatite and Ta-reinforced hydroxyapatite coatings. The results of the study suggest that the proposed Ta reinforcement in hydroxyapatite is potentially important for biodegradable Mg bio-implants.

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Growth and Electrochemical Stability of Compact Tantalum Oxides Obtained in Different Electrolytes for Biomedical Applications

Cited by 23 publications

References 26 publications

Metallic Biomaterials: Current Challenges and Opportunities

Metallic Biomaterials: Current Challenges and Opportunities

Improved Durability and Activity in Pt/Mo₂C Fuel Cell Cathodes by Magnetron Sputtering of Tantalum

Analysis of corrosion behaviour and surface properties of plasma-sprayed composite coating of hydroxyapatite–tantalum on biodegradable Mg alloy ZK60

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Growth and Electrochemical Stability of Compact Tantalum Oxides Obtained in Different Electrolytes for Biomedical Applications

Cited by 23 publications

References 26 publications

Metallic Biomaterials: Current Challenges and Opportunities

Metallic Biomaterials: Current Challenges and Opportunities

Improved Durability and Activity in Pt/Mo2C Fuel Cell Cathodes by Magnetron Sputtering of Tantalum

Analysis of corrosion behaviour and surface properties of plasma-sprayed composite coating of hydroxyapatite–tantalum on biodegradable Mg alloy ZK60

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Product

Resources

About

Improved Durability and Activity in Pt/Mo₂C Fuel Cell Cathodes by Magnetron Sputtering of Tantalum