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Alkali pre-treatment of the Ti6Al7Nb substrate and its impact on electrochemically deposited calcium phosphate coatings

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Iwaniak K. , Kaczorowski W. , Burnat B. , Grabarczyk J.

Engineering of Biomaterials

2024

tom vol. 27, no. 172

1--8

The aim of this work was to investigate the effect of alkali pre-treatment of a Ti6Al7Nb substrate on the morphology and physicochemical properties of calcium phosphate (CaP) coatings. CaP coatings were electrochemically deposited on two groups of substrates: one unmodified and the other pre-treated in a 5M NaOH solution. CaP coatings deposition was performed in a three-electrode system using a potentiostatic mode at a potential of -4 V for 1 h in an electrolyte containing 0.042M Ca(NO3)2 and 0.025M NH4H2PO4. The surface characteristics of the coatings were determined using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), Raman spectroscopy, and contact angle techniques. Additionally, the corrosion resistance of the coatings was assessed by linear polarization resistance and potentiodynamic polarization tests in PBS solution. Morphological analysis showed that the coatings exhibited no significant differences. EDS analysis confirmed the presence of characteristic elements constituting the CaP coatings in both tested groups. Raman spectra revealed the characteristic peaks of the hydroxyapatite (HAp), amorphous calcium phosphate (ACP), and dicalcium phosphate dihydrate (DCPD) structures. Furthermore, Raman mapping confirmed the effectiveness of substrate pre-treatment, leading to the crystalline structure of the coatings. The water contact angle values indicated that pre-treatment of the substrate in NaOH increases the hydrophilicity of the deposited coatings. Regardless of the substrate preparation method, the deposited CaP coatings exhibited protective properties against corrosion under physiological conditions. The results confirmed that alkali pre-treatment of the Ti6Al7Nb alloy affects the crystallinity and the wettability of the electrodeposited CaP coatings.

Modyfikowane materiałami węglowymi oraz niewęglowymi ceramiczne elektrody węglowe - ich zastosowanie do oznaczeń wybranych związków biologicznych

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Węgiel J. , Burnat B. , Skrzypek S.

tom nr 1

12--16

Artykuł powstał na podstawie nagrodzonej przez Komitet Chemii Analitycznej PAN pracy doktorskiej dr Justyny Węgiel pt. "Wytwarzanie i zastosowanie ceramicznych elektrod węglowych do oznaczania wybranych związków biologicznie czynnych". Fundatorem nagrody jest firma Polygen.

Rola palladu w elektrochemii : właściwości, procesy elektroosadzania i zastosowanie

100%

Leniart A. , Burnat B. , Brycht M. , Skrzypek S.

tom [Z] 78, 7-8

987--1024

Palladium is an investment metal that occurs extremely rarely, yet demand for this metal grows each year. Due to its unique properties, it plays a crucial role in many industrial sectors and everyday life. It is widely used in the automotive industry for catalytic converters, in the electronics sector for integrated circuits, in the energy sector as an electrode material in fuel cells, and for energy storage (hydrogen). Among many methods of obtaining palladium materials, electrochemistry holds great potential. By selecting appropriate parameters of electrodeposition process, it is possible to obtain palladium materials with specific chemical compositions (single-, binary-, or ternary-phase) in the form of layers or nanostructures with defined geometries (shape and size). The energy efficiency and catalytic performance of the obtained palladium materials can be enhanced by using suitable carriers with high conductivity, chemical and mechanical stability, and large surface area. Since the breakthrough announcement of cold fusion using palladium by Fleischmann and Pons, interest in palladium has increased significantly, and research on palladium-based materials continues to be extensive. The aim of this article is to discuss the properties of palladium, review research on the electrodeposition of palladium materials, and highlight selected applications (such as in fuel cells and hydrogen production and storage). Additionally, future research perspectives related to palladium will be outlined.