Browsing by Author "Zabludovsky, Volodymyr O."
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Item Phase Composition of Galvanic Iron-Nickel Alloys Obtained Using Pulsed Current(Vasyl Stefanyk Precarpathian National University, 2021) Ganich, Ruslan F.; Zabludovsky, Volodymyr O.; Artemchuk, Viktor V.; Zelenko, Yuliia V.; Marcul, Ruslan V.ENG: The paper presents the results of studying the phase composition of iron-nickel alloys obtained by unsteady electrolysis. It was found that the use of a unipolar pulse current leads to a significant increase in the crystallization overvoltage at the crystallization front at the moment of the pulse action, which affects the component composition of the coatings. The phase composition of the alloys formed at the cathode differs from that shown in the iron-nickel equilibrium diagram.Item Quantum Mechanical Approach for Determining the Activation Energy of Surface Diffusion(Физико-технический институт им. А.Ф. Иоффе Российской академии наук, Санкт-Петербург, 2020) Shtapenko, Eduard Ph. ; Tytarenko, Valentyna V.; Zabludovsky, Volodymyr O.; Voronkov, Eugene O.ENG: A quantum mechanical approach was proposed to determine the activation energy of surface diffusion for copper, nickel, zinc and iron atoms adsorbed on a copper substrate during electrocrystallization for various overvoltages of the substrate. The activation energy of surface diffusion was calculated from the crystal total energy. An increase in the activation energy of surface diffusion with increasing surface potential is associated with an increase in the binding energy between the ad-atom and the substrate.Item Quantum-Mechanical Modeling of the Interaction between Carbon Nanostructures and Metal Ions(Pleiades Publishing, Ltd, 2021) Tytarenko, Valentyna V.; Shtapenko, Eduard Ph. ; Voronkov, Eugene O.; Zabludovsky, Volodymyr O.; Kolodziejczyk, Wojciech; Kapusta, Karina; Kuznetsov, Vitaliy N.EN: In order to investigate a deposition mechanism, authors have proposed a set of quantum chemical models for formation of fullerene C60 and single-wall carbon nanotubes (SWNTs) C48 metal complexes with Co, Ni, Cu, and Zn. Obtained results proving that adsorption of Co, Ni, Cu, Zn ions on a surface of fullerene C60 and SWNT C48 from the aqueous solution of electrolytes is possible with formation of stable metal-doped carbon nanoparticle complexes. Minimum energy complexes of C60-Co and C60-Cu have corresponded to the structure where ion is located above the center of C6 cell. Meanwhile, C60-Ni complex reach a minimum energy when ion is above the middle of a C-C bond, and for C60-Zn complex the most stable conformation is the one when ion is upon the carbon atom. All the optimized structure for metal complexes with C48 has shown ions been located above the C6 cell’s center.Item Structure and Properties of Composite Nickel Coatings Deposited by Means of Programmable Pulsed Current under Laser Irradiation(Pleiades Publishing, 2019) Tytarenko, Valentyna V.; Zabludovsky, Volodymyr O.; Shtapenko, Eduard Ph.ENG: A method for the formation of composite electrolytic coatings in the process of electrodeposition in an electrolyte with ultradisperse diamond (UDD) particles in the programmable pulsed current regime under simultaneous laser irradiation has been developed. This method provides the layer-by-layer deposition of gradient nickel coatings 15–20 μm in thickness with a variable content of UDD particles along their depth. The amount of UDD particles is minimal (0.10–0.13 at %) in the layers deposited in the initial period of this process, whereas the concentration of UDD particles in the layers formed at the later process stages grows to 0.19–0.26 at %. The concentration gradient of UDD particles along the depth improves the adhesion properties and wear resistance of coatings and provides a 16% decrease in the consumption of UDD particles with a local increase in the concentration of UDD particles in a coating to 0.32 at %.Item Structure of Iron-Nickel Coatings Obtained by Using Pulse Current(Прикарпатський національний університет імені Василя Стефаника, Івано-Франківськ, 2019) Ganich, Ruslan Ph.; Zabludovsky, Volodymyr O.; Artemchuk, Viktor V.EN: The paper presents the research results concerning the structure of iron-nickel alloy films obtained with pulse unipolar current from an electrolyte solution. It is shown that under the conditions of unsteady electrocrystallization there are processes on the cathode that lead to the formation of highly nonequilibrium structures and the change in the growth nature of the coating from columnar to layer-by-layer one.