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Publications (103)
For the first time, the wetting behavior of the (Ti, Zr, Hf, Nb, Ta)C) high entropy carbide ceramics by molten Ni-based alloys was investigated using a sessile drop technique in a vacuum environment. Adding 10 wt% of Cr, Mo, or Al into Ni resulted in final contact angles of 14°, 10°, and 14° on the (Ti, Zr, Hf, Nb, Ta)C substrate, respectively. The...
In this study, we show that the use of a mixture of melamine and oxalic acid during the synthesis of acid-treated crystalline graphitic carbon nitride samples significantly enhances its photocatalytic activity in VOCs destruction processes. The rate of photocatalytic ethanol destruction with the participation of modified crystalline graphitic carbo...
Recently, the practical interest of researchers has attracted the MAX phase of Ti3SiC2. This phase is characterized by high electrical and thermal conductivities, low density, high Young’s modulus and fracture toughness. The main disadvantage of existing methods for the synthesis of this MAX phase is the presence of impurity phases such as TiC, SiC...
Introduction: Among children with hypertrophy of pharyngeal tonsils undergoing adenoidectomy, 31.3% of cases show hypertrophy of the torus tubarius, even in the absence of middle ear pathology. However, the nature of the changes in this anatomical area in these children has not been described. The aim of the study: to investigate and evaluate morph...
Semiconductors are considered as promising materials for the criating of new photo-sensors. The photons generated by a KrF laser source (λ = 248 nm, τFWHM ≤ 25 ns) at a fluency of 3.5 and 4.5 J/cm² were used for the synthesis of hybrid Fe/Cr 2D structures via the reaction of ablated iron and chromium atoms from combined target Fe/Cr with oxygen mol...
An erbium-doped β-GaLaS3 crystal has been grown by the solution-melt method, and the effect of γ-irradiation on their vibrational and radiative properties has been investigated. Experiments have demonstrated that the crystal is transparent in the near and mid-IR regions (transparency ∼62% in the range of 350 – 7100 cm-1), which allows it to be used...
For obtaining ZnO nanorods (NRs) on the surface of highly conductive brass substrates, the technology
of surface oxidation in argon plasma ion flows was developed that allows the formation of NRs by highfrequency
helicon discharge at temperatures T ≤ 550 ◦C. A physical mechanism for the formation of
ZnO NRs on the brass substrate is considered. The...
The wetting of (Ti, Zr, Hf, Nb, Ta)C) high entropy carbide ceramics by molten metals was studied using a sessile drop method in a vacuum environment. Fe, Co, and Ni demonstrate good wetting with the (Ti, Zr, Hf, Nb, Ta)C substrate forming a final contact angle of 20°, 30°, and 22°, respectively. A detailed characterization of solidified couples was...
Purpose is to analyze influence mechanisms of physicochemical coal properties on the degree of outburst risk as well as desorption kinetics of methane. Methods of scanning electron microscopy (SEM), electron paramagnetic resonance (EPR), nuclear magnetic resonance (NMR), infrared spectroscopy (IR) and Raman scattering (RS) have been applied. The sa...
Colloidal silver nanoparticles (NPs) synthesized using fungi extract (Ganoderma lucidum) as a reducing and stabilizing agent are studied as a “substrate” for enhancement of Raman scattering (SERS) of analyte molecules. The NPs obtained are nearly spherical with a mean size of 20–30 nm, as proved by scanning electron microscopy (SEM) and dynamic lig...
Fungi produce and excrete various proteins, enzymes, polysaccharides, and secondary metabolites, which may be used as media for the "green" synthesis of metal and semiconductor nanoparticles (NPs). ZnO NPs with a flower-like morphology were synthesized by an affordable colloidal route, using an aqueous extract of Ganoderma lucidum as a reducing age...
Semiconductors are considered promising materials for the fabrication of new thermo-sensors. The photons generated by a KrF laser source (λ = 248 nm, τFWHM ≤ 25 ns) at a fluency of 3.5, 4.5 or 5.5 J/cm2 were used for the synthesis of hybrid Fe/Cr 2D structures via the reaction of ablated iron and chromium atoms from combined target Fe/Cr with oxyge...
Mechanical BehaViour of ti-15Mo alloy Produced With electron-BeaM cold hearth Melting dePending on deforMation rate and in coMParison With other titaniuM alloys Ti-15(wt.%)Mo alloy is produced with conventional cast and wrought approach using double electron beam cold hearth melting, 3D hot pressing, and subsequent rolling. Three batches of specime...
Thermomechanically cold processed (TMCP) steels with a high level of strength are actively used in various constructions. The high strength of the TMCP steels is acquired due to the formation of the fine-grained structure. Such steels have relatively low carbon percentage. These greatly simplify the solution of the problem of improving the quality...
А series of Ag/TiO2 is prepared by the chemical deposition method using silver nitrate and suspension of TiO(OH)2. Silver nanoparticles are deposited on the surface and inside TiO2 nanoparticles depending on the Ag concentration. The Ag/TiO2 composites are characterized by x-ray diffraction, transmission electron microscopy, scanning electron micro...
The photocatalytic properties of layered semiconductors, namely KNb3O8, and a product of its acid treatment, namely K3H3Nb10.8O30 in the reduction reaction of silver ions with the formation of the corresponding metal-semiconductor nanostructures are established. Electron microscopy has shown that silver nanoparticles are deposited mainly on the edg...
Industrial development continues to present challenges for manufacturers. One of them is additive manufacturing (AM) with metallic materials. One promising solution is wire arc additive manufacturing (WAAM). Currently, WAAM is a more promising tool for developers, firstly due to the simplicity of its realization and secondly for its cost-effectiven...
Today, nanocomposites based on magnetite (Fe3O4), zinc oxide (ZnO), titanium oxide (TiO2) doped with metal cations are widely used to create new kinds of biocompatible materials, which are characterized by unique complexes of physical-chemical properties. The semiconducting-nanoparticles' coating by metals leads to their stabilization in corrosive...
As a new class of advanced engineering materials, high entropy alloys exhibit extraordinary mechanical properties and thermal stability, while opening a vast compositional space for the discovery of new compositions of interest. Wire and arc additive manufacturing, WAAM, is a high-throughput deposition additive manufacturing process that is becomin...
The results of studies of printed ZnO:Co polycrystalline layers are first described. The layers with Co concentration of 0.78, 2.09 and 5.42 at.% were printed by a new stencil-free method developed by the authors and then were recrystallized at a temperature 1000–1100 °C. It was shown that the layers were polycrystalline with a typical grain size a...
Green synthesis of different nanoparticles using the plants aqueous extracts has several advantages over other methods due to the environmentally favorable nature of plants. Moreover, such approach is also cost effective. This work describes the biosynthesis of silver nanoparticles (Ag-NPs) with the use of the aqueous extract of dry pericarps of ho...
Industrial development continues to present challenges for manufacturers. One of them is additive manufacturing (AM) with metallic materials. One promising solution is wire arc additive manufacturing (WAAM). Currently, WAAM is a more promising tool for developers, firstly due to the simplicity of its realization and secondly for its cost-effectiven...
Nowadays, different nature magnetite, based on nanocomposites, anatase doped by noble metal cations are widely used to create new kinds of biocompatible materials with unique physical–chemical properties. The magnetite nanoparticle coating by noble metals leads to their stabilization in corrosive biological media and effects on their electrical, ma...
Porous graphitic carbon nitride obtained by pyrolysis of melamine in the presence of silica (TEOS in the reaction mixture) has been found to be more active in photocatalytic hydrogen evolution from the aqueous solutions of electron donors (organic acids) under visible light irradiation compared to the bulk analogue. The use of the optimal melamine/...
The photocatalytic properties of metal-containing nanocomposites based on crystalline graphite-like carbon nitride (CGCN), synthesized in situ by photoreduction of palladium, platinum, and gold ions in the reaction of hydrogen evolution from 96% ethanol under the action of visible light, were determined. The H2 formation rate increases in the seque...
In this work, samples of crystalline graphitic carbon nitride (CGCN) were synthesized by thermal treatment of graphitic carbon nitride (g-C3N4) in a LiCl/KCl melt, followed by activation by aqueous lactic acid. The structures of synthesized materials were investigated by UV–visible, IR spectroscopy, XRD, SEM, XPS, EDX and CHN analysis. It was found...
Semiconductors are considered promising materials of thermo-converters and thermo-sensors. The photons generated by a KrF laser source (λ = 248 nm, τFWHM ≤ 25 ns) were used for the synthesis of stable crystalline phases of copper oxides 2D single-layered semiconductor structures via the reaction of ablated copper atoms with oxygen molecules by reac...
This study presents a striking advance in investigating the influence of heat treatment on the microstructure and properties of high strength low-alloyed steels obtained using various technologies. In contrast to the normalization treatment, the application of the thermo-mechanical control process (TMCP) offers higher strength characteristics but l...
Steels obtained by the thermo‐mechanical control process (TMCP) possess a higher level of strength than conventional normalized steels due to the fine‐grained microstructures generated during TMCP. Such enhancement opens ways to decrease metal construction weight. At the same time, TMCP steels have less thermal stability, in connection with a lot o...
Introduction: The significance of fungal microflora in the development of chronic rhinosinusitis tends to increase. The purpose of the study: We had studied the chemical composition of fungal bodies of odontogenic and nonodontogenic origin to determine the relationship between fungal sinusitis and previous endodontic treatment. Methods and material...
A successful attempt to incorporate the advantages of severe plastic deformation (SPD) methods in the continuous drawing process for low-carbon steel is demonstrated. The structural features are considered on different scale levels, using a wide range of methods. While combining shear deformation, which parallels the basis of SPD with the conventio...
Introduction: There are various theories of the origin of areas with high radiation density in the fungal ball of the paranasal sinuses: X-ray contrast dentist filling material; accumulation of zinc due to enzymes of the metalloproteinase group; formation of osteophytes, etc. The purpose of the study: to study the chemical composition of areas of f...
Shear deformation is one of the effective ways for grain boundary engineering. In the current contribution, the effect of the shear deformation incorporated into the conventional drawing process is shown. A specific feature of this experimental technology is a reduction of the structural anisotropy. This effect is related to the application of dies...
The goal of the present work is a systematic study on an influence of a strain rate on the mechanical response and microstructure evolution of the selected titanium-based materials, i.e., commercial pure titanium, Ti-6Al-4V alloy with lamellar and globular microstructures produced via a conventional cast and wrought technology, as well as Ti-6Al-4V...
Semiconductors are considered as promising materials for the fabrication of photo-thermo sensors with high sensitivity. Therefore, here we propose to synthesize of amorphous 2D single-layered structures with high thermo-photosensitivity by using photons generated by a KrF* laser radiation (λ = 248 nm, τFWHM ≤ 25 ns) in the reaction of copper (Cu) a...
The silicon carbide (SiC) 3C polytype microparticles with p‐type conductivity were investigated by X‐band electron paramagnetic resonance (EPR) technique in the wide temperature interval. Morphological and Raman studies showed that the mean diameter of the particles is ∽8 μm, and the SiC polytype is purely 3C. At T =10 K the EPR spectrum of the sha...
It is shown that post-synthetic thermal treatment of graphitic carbon nitride (g-C3N4), obtained by pyrolysis of melamine, in molten potassium and lithium salts leads to a sixfold increase in its photocatalytic activity in the selective oxidation of benzyl alcohol by air to benzaldehyde in visible light at room temperature, and this is much higher...
Outer membrane vesicles (OMVs), produced by nonpathogenic Gram-negative bacteria, have potentially useful biotechnological applications in extraterrestrial extreme environments. However, their biological effects under the impact of various stressors have to be elucidated for safety reasons. In the spaceflight experiment, model biofilm kombucha micr...
Theoretical and experimental vibrational spectra of ReSe2 nanocrystals, synthesized by self‐limited chemical vapor deposition (CVD), are reported. Scanning electron microscopy reveals that the nanocrystals have the shape of polygon nanoplates (NPs), 20 nm thick and about 100–300 nm wide. X‐ray diffraction studies determined their triclinic structur...
Preparation technology, the structure determination, multiband luminescence and nonlinear optical properties of the chalcogenide glasses are subject of present work. The glass samples with two different Er content were prepared by classical two-stage melt-quenching method. Glass state and morphology were confirmed by X-ray and EDS techniques. Influ...
The synthesis of nanostructured crystalline graphitic carbon nitride (CGCN) by a treatment of bulk g-C3N4 in a KCl + LiCl melt, both in an argon stream and air, is described. The materials obtained were investigated using X-ray diffraction, infrared, UV-vis, and photoluminescence spectroscopy, scanning electron microscopy, and X-ray photoemission s...
The microstructure evolution upon high temperature synthesis and hot deformation of Zr-based alloys (Zr-1.2Sn-1Nb-0.4Fe and Zr-1.2Bi-1Nb-0.4Fe, in wt. %) produced by powder metallurgy (PM, namely pressing and sintering) has been investigated. Bismuth has unique features but is poorly soluble in zirconium. Therefore, it was introduced in alloy with...
There are currently trends in the development of high-strength low-alloyed steels with yield stress YS ≥ 590 MPa in which the heat treatment (quenching and tempering) is replaced by a thermo-mechanical control process (TMCP) followed by accelerated cooling. The application of welding techniques for such steels, today, is based only on the recommend...
The investigation of the electromagnetic shielding properties of composites based on epoxy resin L285 and hybrid filler graphite nanoplatelets/BaTiO3 particles (GNP/BT) has been performed in the frequency range of 1–67 GHz. The experimental study involved measuring direct current (DC) conductivity, complex permittivity (versus frequency), and shiel...
This work is devoted to the development and study of in situ controlled process of the formation of porous anodic alumina and Al nanomesh from thin aluminum films deposited by a direct current magnetron on glass substrates with an adhesive layer of Nb. In order to control in situ anodic oxidation processes during the formation of the structure of P...
It has been shown that post-synthetic heat treatment of g-C3N4 in the melt of potassium and lithium salts leads to a significant increase of photocatalytic activity in the hydrogen formation from aqueous solutions of electron-donor compounds compared to the initial g-C3N4. This could be explained in terms of formation more crystalline graphitic car...
Derivatives of betulin obtained by oxidation have broad pharmacological applications, demonstrating anti-inflammatory, antioxidant, hepatoprotective, and anticancer activity. Ru supported catalysts based on graphitic carbon nitride or N-doped carbon were prepared via a mild reduction of the initial Ru precursor with hydrazine. These catalysts along...
The effect of long-time homogenization and aging on the formation of disperse β′ phase particles and β phase particles has been analyzed. Alloys solidified with the cooling rate of ∼10− 1 °C/s (Al–10%Mg and Al–10%Mg–0.1%Sc) and alloys melted by centrifugal casting with the cooling rate of ∼ 10³ °C/s (Al–10%Mg) were chosen for comparative analysis....
This work is aimed at development of the technology of thin-film porous anodic alumina/aluminum (PAA/Al) structures for optical sensors based on metal-clad waveguides and Al nanomesh films for transparent conductive layers. The method of optical control directly in the process of the structures formation which consists in monitoring of the angular...
The introduction of colloidal single-layer carbon nitride (SLCN) nanosheets at the stage of the formation of Au nanocrystals (NCs) in aqueous solutions allows the surface plasmon resonance peak position of gold/SLCN composites to be tuned in a relatively broad range of 520-610 nm. The effect is believed to originate from a strong electronic interac...
Hard coatings are increasingly being used in medicine to protect metal endoprostheses The experimental process for the high-productive synthesis of high-quality diamond-like carbon (DLC) coatings with high hardness and a sufficiently high level of adhesion to the spherical shaped parts of the hip joint made from the stainless steel or cobalt-chrome...
A kombucha multimicrobial culture (KMC) was exposed to simulated Mars-like conditions in low-Earth orbit (LEO). The study was part of the Biology and Mars Experiment (BIOMEX), which was accommodated in the European Space Agency's EXPOSE-R2 facility, outside the International Space Station. The aim of the study was to investigate the capability of a...
This work describes fabrication and characterization of two types of surface‐enhanced Raman scattering (SERS) substrates based on starlike gold nanoparticles (NPs). Type I SERS substrates are formed by adsorption of gold nanoparticles from chemically synthesized colloidal solution onto the modified glass substrates. Type II SERS substrates are fabr...
The main reason of an accident at the Piskivka glass plant (Kyiv region, Ukraine) was in failure and degradation of a molybdenum insert in refractory REFEL 1240 FVMo block in the throat of glass-melting furnace. Using the analysis of literature data and the available data obtained at the plant, it was shown that this should be preceded by active de...
It has been shown that in case of adding a regulated plasma component of gas to the working gas mixture, the synthesis by the PECVD method of carbon nanotubes (CNT) on catalytic centers formed from a thin film deposited by vacuum-arc sputtering of a catalyst leads to the formation of nanotubes of two morphological types: forest and multiwall CNTs w...
This work describes corrosion behaviors of the coatings deposited by PVD CAE method from a cathode made of the high-entropy alloy of equiatomic composition AlCuCrCoNiFe. The so-called ‘micro-drop’ regime of evaporation/deposition was used. Thus, according to the SEM data, chemical compositions of the obtained HEA coatings were almost identical to t...
Hybrid hydrogels have gained a lot of attention due to their unique properties which can be tailored for a variety of applications. In this paper, hybrid porous polymers based on sponge-like acetals of polyvinyl alcohol (polyvinyl formals) with functionalized pore structure by pH-sensitive or thermosensitive hydrogels have been synthesized. Synergi...
Electronic scanning microscopy was used in the work to obtain the image and to identify the sizes of titanium dioxide (TiO2) nanoparticles 21 ± 5 nm. The qualitative and quantitative elemental analysis of the preparations of the caecum, antrum, myometrium, kidneys, and lungs of the rats, burdened with titanium dioxide, was also performed. It was es...
Nanostructured composites based on layered niobates KNb3O8, K3N3Nb10.8O30 and HNb3O8 as well as C3N4 were obtained. It was established that the rate of hydrogen evolution from electron donors water solutions under visible light using composites niobate/C3N4 as photocatalysts significantly exceeds the rate value for an individual C3N4. This phenomen...
A composite material for the preparation of specimens for metallographic investigation through electron backscatter diffraction is proposed. It allows cold mounting of metal samples in conductive filler for subsequent treatment. The procedure of specimen preparation consists of grinding, polishing and electropolishing of the metal sample filled wit...
It was found that treatment of KNb3O8 with nitric acid leads to the formation of K3H3Nb10.8O30, which has enhanced photocatalytic activity in the production of hydrogen. The highest rate of release of H2 in the investigated systems is achieved after treatment of KNb3O8 with nitric acid for 10 h, which corresponds to complete transformation of the i...
Single crystals (Ga55In45)2S300 and (Ga54.59In44.66Er0.75)2S300 possessing space group P61 were successfully grown and explored with respect to laser induced piezooptics. Their structural properties were studied by Raman spectroscopy and additionally, dependence of different gamma ray doses on the photoinduced piezo-optical responses were also expl...
A possibility to obtain graphene and graphene layers with the help of the ultrasound (US) treatment of pyrolytic graphite in an N-methyl pyrrolidone (NMP) solution has been demonstrated. Raman spectroscopy is confirmed to be an effective method for monitoring the graphite transformation into graphene. By varying the time of the ultrasonic treatment...
Kombucha microbial community (KMC) produces a cellulose-based biopolymer of industrial importance and a probiotic beverage. KMC-derived cellulose-based pellicle film is known as a highly adaptive microbial macrocolony - a stratified community of prokaryotes and eukaryotes. In the framework of the multipurpose international astrobiological project "...
Aluminum nitride(AlN)film coatings on flexible substrates (polymeric Teflon, Mylar) have been obtained using a hybrid helicon-arc ion-plasma deposition technique with high adhesion of coatings. Studies of optical, morphological, and structural