Anton Konopatsky

Anton Konopatsky
National University of Science and Technology MISIS · Department of High-Temperature Materials and Processes

Ph D

About

60
Publications
5,583
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402
Citations
Citations since 2016
50 Research Items
388 Citations
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
Introduction
Skills and Expertise

Publications

Publications (60)
Article
Due to their high toxicity, even a small amount of phenols entering the surrounding aquatic environment poses a serious danger to all living beings. To address this important problem, commercial micron-sized h-BN powder was ball milled at 450, 600 and 750 rpm, surface-functionalized with hydroxyl and amino groups by sonication, and characterized as...
Article
Full-text available
Herein we report a simple and easily scalable method for fabricating ZnO/h-BN composites with tunable photoluminescence (PL) characteristics. The h-BN support significantly enhances the ultraviolet (UV) emission of ZnO nanoparticles (NPs), which is explained by the ZnO/h-BN interaction and the change in the electronic structure of the ZnO surface....
Article
Full-text available
Methylene blue (MB) is widely used as a test material in photodynamic therapy and photocatalysis. These applications require an accurate determination of the MB concentration as well as the factors affecting the temporal evolution of the MB concentration. Optical absorbance is the most common method used to estimate MB concentration. This paper pre...
Article
The photocatalytic activity of MoS2-based heterostructures largely depends on the thickness and orientation of the MoS2 components. We report a new facile two-step carbothermal-reduction-assisted CVD synthesis protocol to produce horizontally and vertically aligned MoS2 nanosheets (NSs) on activated carbon (AC) granules. MoO3/AC pellets were first...
Article
Full-text available
Due to its unique physical, chemical, and mechanical properties, such as a low specific density, large specific surface area, excellent thermal stability, oxidation resistance, low friction, good dispersion stability, enhanced adsorbing capacity, large interlayer shear force, and wide bandgap, hexagonal boron nitride (h-BN) nanostructures are of gr...
Article
Nanomaterials with high specific surface area and high absorption capacity are attracting increased interest aimed at imparting the desired magnetic properties. This work is devoted to the study of the effect of heat treatment in a hydrogen atmosphere on the microstructure, adsorption and magnetic properties of heterogeneous FePt/h-BN nanomaterials...
Article
Full-text available
Various biomedical applications of biodegradable nanofibers are a hot topic, as evidenced by the ever-increasing number of publications in this field. However, as-prepared nanofibers suffer from poor cell adhesion, so their surface is often modified. In this work, active polymeric surface layers with different densities of COOH groups from 5.1 to 1...
Article
COOH plasma polymer layers deposited onto polycaprolactone (PCL) nanofibers by plasma polymerization of CO2 and C2H4 in the Ar atmosphere were obtained and tested for diabetic wound healing. Simply by changing the deposition time, very different morphologies of coated PCL nanofibers were achieved. In vivo tests revealed that by applying modified na...
Article
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This study focused on the synthesis and characterization of pure curdlan–chitosan foams (CUR/CS), as well as foams containing Ag nanoparticles (CUR/CS/Ag), and their effect on the skin repair of diabetic mice (II type). The layer of antibacterial superabsorbent foam provides good oxygenation, prevents bacterial infection, and absorbs exudate, formi...
Article
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Four novel superelastic alloys, Ti-41Zr-12Nb, Ti-42Zr-11Nb, Ti-43Zr-10Nb, Ti-44Zr-10Nb (at.%), were obtained and studied in terms of their microstructure and mechanical properties. The obtained alloys were subjected to thermomechanical treatment, providing alloys with a pronounced superelastic behavior. Materials phase composition and microstructur...
Article
Full-text available
Four novel superelastic alloys, Ti-41Zr-12Nb, Ti-42Zr-11Nb, Ti-43Zr-10Nb, Ti-44Zr-10Nb (at.%), were obtained and studied in terms of their microstructure and mechanical properties. The obtained alloys were subjected to thermomechanical treatment, providing alloys with a pronounced superelastic behavior. Materials phase composition and microstructur...
Article
Full-text available
Molybdenum sulfide is a very promising catalyst for the photodegradation of organic pollutants in water. Its photocatalytic activity arises from unsaturated sulfur bonds, and it increases with the introduction of structural defects and/or oxygen substitutions. Amorphous molybdenum sulfide (a-MoSxOy) with oxygen substitutions has many active sites,...
Article
Environmental protection requires solving the problem of utilization and reduction of CO and CO2 emissions. Herein, Au/h-BN(O) and Pt/h-BN(O) nanohybrids are thoroughly analyzed in CO oxidation and CO2 hydrogenation reactions. The nanohybrids differ in catalytic particle size and particle distribution. The particles are smaller (1-6 nm) and display...
Article
Ni-x%BN composites (x=0.001, 0.05, and 0.1 wt.%) with enhanced tensile and bending strength, as well as high ductility were fabricated by a combination of ball milling and spark plasma sintering. Material with 0.05wt.% of hexagonal BN (h-BN) nanoflakes show an increase in tensile strength of 26% (25 oC) and 63% (750 oC) compared to additive-free Ni...
Article
To date, significant progress has been achieved in the development of biomedical superelastic Ti-based alloys with high mechanical properties. In view of the high probability of implant-associated infection, an urgent task is to impart bactericidal properties to the material. Herein, advanced superelastic Ti-18Zr-15Nb alloys were surface-etched in...
Article
Hexagonal boron nitride (h-BN) nanosheets are a promising material for various applications including catalysis. Herein, h-BN-supported Fe-based catalysts are characterised with respect to CO2 hydrogenation reaction. Heterogeneous Fe3O4/BN, Fe3O4(Pt)/BN, and FePt/BN nanostructures are obtained via polyol synthesis in ethylene glycol. The sizes of F...
Article
Al-based composites with enhanced thermomechanical properties are in high demand. However, obtaining a uniform distribution of the strengthening phase in the metal matrix and achieving a strong metal/ceramic interface is still a great challenge. In this work, nanoAl/nanoSiC powder mixtures after high-energy ball milling were treated with Ar microwa...
Article
Two novel superelastic Ti-41Zr-8(10)Nb alloys were studied and compared to the reference Ti-18Zr-15Nb alloy (all in at. %) in terms of their microstructure and mechanical properties. A thermomechanical treatment consisting of cold rolling and post-deformation annealing was applied to all the alloys to create conditions for their superelastic behavi...
Article
Continuous nanocrystalline coatings of hexagonal boron nitride (h-BN) with a thickness of 1000-350 nm are prepared from highly concentrated aqueous solutions of lithium and sodium borates, which display good film-forming properties. The borate solutions were applied on silicon substrates by spin coating followed by drying in air and treatment in am...
Article
Continuous nanocrystalline coatings of hexagonal boron nitride (h-BN) with a thickness of 1000-350 nm are prepared from highly concentrated aqueous solutions of lithium and sodium borates, which display good film-forming properties. The borate solutions were applied on silicon substrates by spin coating followed by drying in air and treatment in am...
Article
Full-text available
Novel superelastic Ti-44Zr-10Nb (at.%) alloy was obtained by vacuum arc remelting method and subjected to homogenization (950°C, 60 min) and thermomechanical treatment (TMT), which consisted of cold rolling (CR) with 25% thickness reduction rate and consequent post-deformation annealing (PDA) at 550 °C for 30 min. Chemical composition analysis was...
Article
Full-text available
A new biomedical Ti-18Zr-14Nb (at.%) alloy was processed using the laser powder bed fusion additive manufacturing technology and subjected to post-fusion annealing in the 400 to 900 °C temperature range. The meltpool and grain structure features, the phase composition and hardness of samples fabricated using different laser energy densities and bui...
Article
Full-text available
Ag nanoparticles (AgNPs) were formed over the surface of novel superelastic Ti-Zr-Nb alloy via polyol synthesis at room temperature. Two synthesis media were used for AgNPs formation: ethylene glycol (EG) and polyethylene glycol (PEG-400). AgNPs formation rate in different polyols was evaluated by UV-VIS spectroscopy. Based on the obtained results...
Article
Utilization of metal/ceramic powders opens new possibilities for 3D printing of metal matrix composites of complex shape with high strength, but it is still a great challenge. In this work, an AlSi10Mg matrix composite embedded with 1 wt% of hexagonal BN phase microflakes (h-BN) was obtained by means of 3D printing. Then the present study elucidate...
Article
Uncovering the mechanism behind nanocrystalline hexagonal boron nitride (h-BN) formation at relatively low temperatures is of great scientific and practical interest. Herein, the sequence of phase transformations occurring during the interaction of boric acid with ammonia in a temperature range of 25-1000 °C has been studied in detail by means of t...
Article
Full-text available
The interaction of a mixture of Al and BN nanopowder with a hydrogen microwave plasma wasstudied. Using X-ray phase analysis, as well as scanning and transmission electron microscopy, the formationof AlN and AlB2 nanocrystals as a result of short-term (∼30 ms) interaction of Al vapor with h-BN was estab-lished. The research results also indicate th...
Article
This work is aimed at the development of bimetallic (Ni0.2Cu0.8) catalysts with hexagonal boron nitride (h-BN) nanosheet (BNNS) supports and elucidating their catalytic activity in the methanol steam reforming and CO oxidation reactions. The hybrid Ni0.2Cu0.8/BN catalysts consist of curved h-BN nanosheets, up to 10-20 nm in lateral size, decorated...
Article
Polyol method provides variety of options for microstructure control of a synthesized material. The present study aims to demonstrate that in case of Ag/h‐BN nanohybrid fabrication the synthesis time requires precise tuning. Nonlinear correlation between synthesis time and Ag nanoparticles (AgNPs) formation and deposition is found and discussed. Ca...
Article
Full-text available
Iron powders and Fe/graphene oxide and Fe/boron nitride composites were synthesized by means of a polyol synthesis method. The effect of NaOH/Fe and ascorbic acid/Fe ratios on the characteristics of synthesized products were evaluated. The samples were characterized by X-ray diffraction, scanning and transmission electron microscopy, low-temperatur...
Article
Full-text available
Due to their good mechanical stability compared to gelatin, collagen or polyethylene glycol nanofibers and slow degradation rate, biodegradable poly-ε-caprolactone (PCL) nanofibers are promising material as scaffolds for bone and soft-tissue engineering. Here, PCL nanofibers were prepared by the electrospinning method and then subjected to surface...
Article
Ti – Zr-based alloys with a high zirconium content prepared by vacuum-arc remelting with nonconsumable tungsten electrode are studied. The optimum number of remelting operations and melting conditions in order to achieve a highly uniform distribution of components and low content of impurities in the alloy are determined. Optimum thermomechanical t...
Article
This mini review is devoted to analysis of the latest advances in the development of aluminum-based composite materials (CMs) reinforced by microstructures and nanostructures. The fabrication methods of CMs, various reinforcing additives (Al2O3, AlN, SiC, CuO, B4C, Li3N, C, and BN), and their morphological types (nanotubes, nanoplates, microparticl...
Article
Herein we analyzed the chemical reactions occurring in the process of Ag/BN hybrid fabrication in polyethylene glycol (PEG) using h-BN nano- and microparticles (BNNPs and BNMPs) during AgNO3 decomposition under UV irradiation. Decomposition of AgNO3 causes formation of Ag nanoparticles (AgNPs) and PEG oxidation reaction, the products of which inter...
Article
Full-text available
Titanium alloys are well recognized as appropriate materials for biomedical implants. These devices are designed to operate in quite aggressive human body media, so it is important to study the corrosion and electrochemical behavior of the novel materials alongside the underlying chemical and structural features. In the present study, the prospecti...
Article
Full-text available
In this comparative study, the structural and superelastic characteristics of two thermomechanically treated metastable Ti-Nb based (Ti-22Nb-6Zr) and Ti-Zr based (Ti-18Zr-14Nb and Ti-18Zr-13Nb-2Ta (at. %)) alloy systems were studied. To study the influence of room temperature storage on the functional properties of these two alloy systems, the allo...
Article
This mini review focuses on the analysis of the latest advances in the development of composite materials (CM) based on aluminum reinforced by micro and nanostructures. CM fabrication methods, different reinforcing additives (Al2O3, AlN, SiC, CuO, B4C, Li3N, C, BN) and their morphological types (nanotubes, nanoplates, micro and nanoparticles), and...
Article
This study aims to define the nature (discrete or continuous?) of stress-induced transformation mechanisms in nickel-rich Ti-Ni shape memory alloys with a grain size down to 8 nm. The alloys were subjected to thermomechanical treatments comprising cold rolling with true strains of e = 0.3, 0.55 and 1.7 and post-deformation annealing in the 300–700...
Article
Nanohybrid materials made of h-BN nanoparticles (BNNPs) with Ag nanoparticles (AgNPs), covering their surfaces, were employed as catalysts in CO oxidation reaction. Ag/BN nanohybrids (NHs) were produced via AgNO3 decomposition under UV irradiation in polyethylene glycol (PEG) and its solutions at room temperature. Influence of the synthetic media c...
Article
In this paper, the effects of Ta substitution for Nb, on the microstructure and corrosion fatigue behavior of metastable Ti-18Nb-14Zr biomedical alloy are investigated for the first time. For this purpose, besides previously studied ternary Ti-18Zr-14Nb alloy, new quaternary Ti-18Zr-13Nb-1Ta (at.%) biomedical alloy was also synthesized by vacuum ar...
Article
Hexagonal boron nitride nanoparticles (BNNPs) with different amounts of boron oxide on their surfaces were used as catalyst carriers. BNNPs/Ag nanohybrids were produced via ultraviolet (UV) decomposition of AgNO3 in a mixture of polyethylene glycol and BNNPs. High temperature (1600°C, 1.5 h) vacuum annealing of BNNPs promoted small size (5-10 nm) A...
Article
Superelastic Ti-Zr-based alloys were produced by vacuum arc remelting (VAR) method. Ti-22Nb-6Zr was chosen as reference alloy. Experimental specimens were subjected to the following thermomechanical treatment (TMT): cold rolling (CR) with a true logarithmic strain of e = 0.3 and post-deformation annealing (PDA) at 600°C or 700°C (30 min). X-Ray dif...
Article
Ti-18Zr-14Nb, Ti-18Zr-13Nb-1Ta, Ti-18Zr-12Nb-2Ta and Ti-18Zr-11Nb-3Ta (at.%) shape memory alloys were obtained by vacuum arc remelting and subjected to different thermomechanical treatment (TMT) schedules. The transmission electron microscopy analysis revealed that a TMT, which consisted of cold rolling with a true logarithmic strain of e = 0.3 and...
Article
A transmission electron microscopy and in situ X-ray diffractometry study of Ti-50.61 at.% Ni shape memory alloy was carried out with an objective to clarify the stress-induced transformation mechanism in nanostructured B2-austenite. Extremely small austenite structure elements (grains/subgrains), about 15 nm in size, were obtained via a thermomech...
Article
Vacuum-arc remelting with a nonconsumable electrode is used to prepare ingots of superelastic alloys Ti–22Nb–6Ta, Ti–22Nb–6Zr, and Ti–22Nb–3Ta–3Zr (at.%) that are studied by light and scanning electron microscopy. It is established that the microstructure of all alloys has fundamental differences. Ingots of all of the alloys develop limited dendrit...
Article
This paper focuses on the development and characterization of Ni-free shape memory alloys, more specifically, Ti–Nb-based alloys for biomedical applications. It starts by describing the smelting technology used to produce small and medium size ingots of selected compositions. Thermomechanical treatments: structure interrelations are discussed next....
Article
Metastable near-beta Ti-21.8Nb-6Zr and Ti-19.7Nb-5.8Ta (at.%) alloys were subjected to a thermomechanical treatment comprising cold rolling (CR) with a true strain of e=0.3 and post-deformation annealing (PDA) in the 500-900 °C temperature range to ensure the superelastic behavior which is important for bone implants. It was found that PDA resulted...
Conference Paper
Full-text available
The aim of the present work was to study corrosion and electrochemical behavior of Ti-22Nb-6Ta (at. %) superelastic alloy in comparison with commercially pure titanium (cp-Ti) under simulated service conditions of load-bearing bone implants, i.e. under cyclic load in simulated body fluid environment. Open circuit potential (OCP) measurements were c...
Conference Paper
Full-text available
Metastable Ti-Nb-based shape memory and superelastic alloys are known to be strong candidates for bone implant applications. The issues of the materials’ biochemical and biomechanical compatibility and its characterization are reviewed. Thermomechanical treatment is conventionally applied to these alloys in order to obtain supreme functional proper...
Article
Full-text available
Vacuum induction melting (VIM) and vacuum arc remelting (VAR) methods were used to produce biocompatible Ti-Nb-based alloys. In case of VIM BeO was used as material of crucible, and copper mold cup in case of VAR. Superelastic biocompatible Ti-22Nb-3Ta-3Zr, Ti-22Nb-6Ta and Ti-22Nb-6Zr (at %) alloys were produced. Samples of obtained alloys were inv...
Article
Full-text available
Superelastic biocompatible metallic materials Ti-22Nb-6Zr and Ti-22Nb-3Ta-3Zr (at %) were produced. Vacuum arc remelting (VAR) with manual control allowed to produce high-purity alloys. X-ray fluorescence spectrometry (XRF) results showed that one remelt was not enough to obtain homogeneous Ti-Nb-Ta-Zr ingot. Ti-Nb-Zr and Ti-Nb-Ta-Zr alloys were re...
Article
Full-text available
The aim of the present work was to study corrosion and electrochemical behavior of Ti-22Nb-6Ta and Ti-22Nb-6Zr (at.%) superelastic alloys under conditions which imitate the performance mode of target devices (bone implants), i.e., under cyclic load in simulated physiological solutions. Open circuit potential (OCP) measurements were carried out on w...
Article
This paper focuses on study of the kinetics and the mechanism of passive film formation on novel superelastic biomedical Ti–22Nb–6Ta (at.%) alloy in simulated physiological solutions using AES, XPS and electrochemical techniques in comparison with commercially pure titanium and Nitinol. Ti–22Nb–6Ta alloy manifests a strong trend to protective passi...
Article
Full-text available
This paper focuses on study of the kinetics and the mechanism of passive film formation on novel superelastic biomedical Ti-22Nb-6Ta and Ti-21.8Nb-6Zr (at.%) alloys in simulated physiological solutions using XPS and electrochemical techniques in comparison with commercially pure titanium and Nitinol. In vitro biocompatibility study of Ti-22Nb-6Ta a...

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Projects (2)
Project
Laser powder-bed fusion processing and post-processing of metallic components
Project
Composition-processing-structure-properties interaction