Electrodeposition of Tantalum Coatings on Nitinol Stent and Composition of Intermetallic Compounds Forming During Electrolysis

Dubrovskii, A. R.; Макарова, О. В.; Kuznetsov, S. A.

doi:10.1149/1945-7111/abf696

Cited by 5 publications

(3 citation statements)

References 33 publications

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“…To effectively isolate the magnesium substrate from an aqueous solution or physiological environment, Mg(OH) 2 coating is used as a physical barrier; however, this is insufficient to give magnesium alloys long-term corrosion resistance. The adhesion between the magnesium substrate and the outer layer is frequently increased, using Mg(OH) 2 film as an inner layer [112].…”

Section: Magnesium-based Coatingsmentioning

confidence: 99%

Coatings for Cardiovascular Stents—An Up-to-Date Review

Udriște,

Burdușel,

Niculescu

et al. 2024

IJMS

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Cardiovascular diseases (CVDs) increasingly burden health systems and patients worldwide, necessitating the improved awareness of current treatment possibilities and the development of more efficient therapeutic strategies. When plaque deposits narrow the arteries, the standard of care implies the insertion of a stent at the lesion site. The most promising development in cardiovascular stents has been the release of medications from these stents. However, the use of drug-eluting stents (DESs) is still challenged by in-stent restenosis occurrence. DESs’ long-term clinical success depends on several parameters, including the degradability of the polymers, drug release profiles, stent platforms, coating polymers, and the metals and their alloys that are employed as metal frames in the stents. Thus, it is critical to investigate new approaches to optimize the most suitable DESs to solve problems with the inflammatory response, delayed endothelialization, and sub-acute stent thrombosis. As certain advancements have been reported in the literature, this review aims to present the latest updates in the coatings field for cardiovascular stents. Specifically, there are described various organic (e.g., synthetic and natural polymer-based coatings, stents coated directly with drugs, and coatings containing endothelial cells) and inorganic (e.g., metallic and nonmetallic materials) stent coating options, aiming to create an updated framework that would serve as an inception point for future research.

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Section: Magnesium-based Coatingsmentioning

confidence: 99%

Coatings for Cardiovascular Stents—An Up-to-Date Review

Udriște,

Burdușel,

Niculescu

et al. 2024

IJMS

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“…Note that the application of a cathodic current density of 0.005-0.1 A cm −2 resulted in deposition of the β-Ta phase as a coating. [36][37][38][39]…”

Section: Phase Composition Wt%mentioning

confidence: 99%

Electrodeposition of Beta-Tantalum in Alkali Metal Halides and Oxohalide Melts

Kuznetsov

2024

J. Electrochem. Soc.

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Data on the electrolytic preparation of β-Ta in halide and oxohalide melts were reported. It was shown that during electrolysis in halide melts containing K2TaF7, the amount β-Ta in the cathodic products can be markedly increased by using a copper cathode with a definite texture. It was found that in chloride-oxofluoride melts the β-Ta content increases monotonically on passing from NaCl to KCl and RbCl melt. The dependencies of the β-Ta content in cathodic products on the ratio of oxygen to tantalum concentrations were studied in chloride-oxofluoride and fluoride-oxofluoride melts. The maxima of these dependences were identified and explained. It was shown that β-Ta could be obtained by electrolysis in molten salts only at temperatures below 850 °C.

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“…The present work is devoted to enhancing the understanding of the electrochemical behavior of aluminum in the LiF-AlF 3 melt with various compositions in the presence of the spent catalyst at 740-800 • C. The tungsten rod was used as an electrode because the material possesses high chemical stability towards liquid aluminum and the cathode process on tungsten has been widely studied in fluoride and chloride melts [23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Towards Understanding the Cathode Process Mechanism and Kinetics in Molten LiF–AlF3 during the Treatment of Spent Pt/Al2O3 Catalysts

Yasinskiy

Padamata

Stopić

et al. 2021

Metals

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Electrochemical decomposition of spent catalyst dissolved in molten salts is a promising approach for the extraction of precious metals from them. This article reports the results of the study of aluminum electrowinning from the xLiF–(1-x)AlF3 melt (x = 0.64; 0.85) containing 0–5 wt.% of spent petroleum Pt/γ-Al2O3 catalyst on a tungsten electrode at 740–800 °C through cyclic voltammetry and chronoamperometry. The results evidence that the aluminum reduction in the LiF–AlF3 melts is a diffusion-controlled two-step process. Both one-electron and two-electron steps occur simultaneously at close (or same) potentials, which affect the cyclic voltammograms. The diffusion coefficients of electroactive species for the one-electron process were (2.20–6.50)∙10−6 cm2·s–1, and for the two-electron process, they were (0.15–2.20)−6 cm2·s−1. The numbers of electrons found from the chronoamperometry data were in the range from 1.06 to 1.90, indicating the variations of the partial current densities of the one- and two-electron processes. The 64LiF–36AlF3 melt with about 2.5 wt.% of the spent catalysts seems a better electrolyte for the catalyst treatment in terms of cathodic process and alumina solubility, and the range of temperatures from 780 to 800 °C is applicable. The mechanism of aluminum reduction from the studied melts seems complicated and deserves further study to find the optimal process parameters for aluminum reduction during the spent catalyst treatment and the primary metal production as well.

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Electrodeposition of Tantalum Coatings on Nitinol Stent and Composition of Intermetallic Compounds Forming During Electrolysis

Cited by 5 publications

References 33 publications

Coatings for Cardiovascular Stents—An Up-to-Date Review

Coatings for Cardiovascular Stents—An Up-to-Date Review

Electrodeposition of Beta-Tantalum in Alkali Metal Halides and Oxohalide Melts

Towards Understanding the Cathode Process Mechanism and Kinetics in Molten LiF–AlF3 during the Treatment of Spent Pt/Al2O3 Catalysts

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