36 results on '"Maksym Lisnichuk"'
Search Results
2. Effect of Storage Conditions on the Stability of Colloidal Silver Solutions Prepared by Biological and Chemical Methods
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Oksana Velgosova, Peter Varga, Dana Ivánová, Maksym Lisnichuk, and Mária Hudá
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AgNPs ,stability ,green synthesis ,chemical synthesis ,TEM ,UV–vis spectrophotometry ,Mining engineering. Metallurgy ,TN1-997 - Abstract
The research aimed to observe the influence of the storage conditions of silver colloidal solutions prepared by biological (green) and chemical methods on their long-term stability. Green methods for reducing and stabilizing silver nanoparticles (AgNPs) use natural substances. The rosemary leaf extract was used for AgNPs synthesis, and prepared nanoparticles were spherical (average size of 12 nm). In the chemical method, commercial chemicals (NaBH4, TSC, PVP, and H2O2) were used, and two colloids were prepared; the first contained spherical nanoparticles with an average size of 8 nm, and the second triangular prisms with an average size of 35 nm. The prepared colloids were stored under four conditions: at room temperature in the light and the dark, and at a temperature of 5 °C (refrigerator) in the light and the dark. The results confirmed the influence of storage conditions on the stability of nanoparticles. Colloids stored at 5 °C in the dark show the best stability. However, differences in stability dependent on the shape of nanoparticles prepared by chemical method were also observed; triangular nanoparticles showed the least stability. Methods such as UV–vis spectrophotometry, TEM, and EDX were used to analyze the nanoparticles before and after storage.
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- 2024
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3. Advanced Photodegradation of Azo Dye Methyl Orange Using H2O2-Activated Fe3O4@SiO2@ZnO Composite under UV Treatment
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Oksana Makota, Erika Dutková, Jaroslav Briančin, Jozef Bednarcik, Maksym Lisnichuk, Iryna Yevchuk, and Inna Melnyk
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photocatalytic degradation ,methyl orange ,magnetic nanocomposite ,H2O2 activation ,Organic chemistry ,QD241-441 - Abstract
The Fe3O4@SiO2@ZnO composite was synthesized via the simultaneous deposition of SiO2 and ZnO onto pre-prepared Fe3O4 nanoparticles. Physicochemical methods (TEM, EDXS, XRD, SEM, FTIR, PL, zeta potential measurements, and low-temperature nitrogen adsorption/desorption) revealed that the simultaneous deposition onto magnetite surfaces, up to 18 nm in size, results in the formation of an amorphous shell composed of a mixture of zinc and silicon oxides. This composite underwent modification to form Fe3O4@SiO2@ZnO*, achieved by activation with H2O2. The modified composite retained its structural integrity, but its surface groups underwent significant changes, exhibiting pronounced catalytic activity in the photodegradation of methyl orange under UV irradiation. It was capable of degrading 96% of this azo dye in 240 min, compared to the initial Fe3O4@SiO2@ZnO composite, which could remove only 11% under identical conditions. Fe3O4@SiO2@ZnO* demonstrated robust stability after three cycles of use in dye photodegradation. Furthermore, Fe3O4@SiO2@ZnO* exhibited decreased PL intensity, indicating an enhanced efficiency in electron-hole pair separation and a reduced recombination rate in the modified composite. The activation process diminishes the electron-hole (e−)/(h+) recombination and generates the potent oxidizing species, hydroxyl radicals (OH˙), on the photocatalyst surface, thereby playing a crucial role in the enhanced photodegradation efficiency of methyl orange with Fe3O4@SiO2@ZnO*.
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- 2024
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4. Fabrication and characterization of high entropy pyrochlore ceramics
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Branko Matović, Dejan Zagorac, Ivana Cvijović-Alagić, Jelena Zagorac, Svetlana Butulija, Jelena Erčić, Ondrej Hanzel, Richard Sedlák, Maksym Lisnichuk, and Peter Tatarko
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Cerámica de alta entropía ,Estructura de pirocloro ,Densificación ,Predicción de la estructura cristalina ,Clay industries. Ceramics. Glass ,TP785-869 - Abstract
High-entropy rare-earth (RE) zirconates with pyrochlore structure were successfully fabricated by pressureless and spark plasma sintering. RE2Zr2O7 compound with nominal composition (La0.2Y0.2Gd0.2Nd0.2Sm0.2)Zr2O7 was prepared by simple glycine nitrate procedure (GNP). GNP process yielded powders with low crystallinity and after subsequent calcination, well crystalline ceramics were formed. During calcination defective fluorite (F-RE2Zr2O7) and crystal pyrochlore (Py-RE2Zr2O7) structures coexist. Formation of pure crystalline pyrochlore occurs after sintering at 1450 °C. High-density ceramics, free of any additives, were obtained after powders compaction and pressureless (PS), as well as field assisted sintering technique (FAST) at 1450 °C. Theoretical investigations of the high-entropy RE2Zr2O7 pyrochlore systems were performed. Unit cell parameter of the obtained Py-RE2Zr2O7 is 10.5892(2) Å and 10.5999(2) Å for PS and FAST sintering, respectively, which is in good agreement with the results of Density Functional Theory (DFT) calculations. The thermal diffusivity of sintered samples at room temperature was ∼0.7 mm2/s for both sintering methods. Resumen: Se fabricaron con éxito, mediante sinterización por plasma sin presión y por chispa, los circonatos de tierras raras (RE) de alta entropía con estructura de pirocloro. El compuesto RE2Zr2O7 con composición nominal (La0,2Y0,2Gd0,2Nd0,2Sm0,2)Zr2O7 se preparó mediante un procedimiento simple de nitrato de glicina (GNP). El proceso GNP produjo polvos con baja cristalinidad y después de la posterior calcinación, se formaron cerámicas bien cristalinas. Durante la calcinación coexisten estructuras defectuosas de fluorita (F-RE2Zr2O7) y pirocloro cristalino (Py-RE2Zr2O7). La formación de pirocloro cristalino puro se produce después de la sinterización a 1.450 °C. Después de la compactación de polvos y sin presión (PS), así como por la técnica de sinterización asistida en campo (FAST) a 1.450 oC, se obtuvieron cerámicas de alta densidad, libres de aditivos. Se realizaron investigaciones teóricas de los sistemas de pirocloro RE2Zr2O7 de alta entropía. El parámetro de celda unitaria del Py-RE2Zr2O7 obtenido es 105.892(2) Å y 105.999(2) Å para la sinterización PS y FAST, respectivamente, lo que está de acuerdo con los resultados de los cálculos de la teoría funcional de la densidad (DFT). La difusividad térmica de las muestras sinterizadas a temperatura ambiente fue de ∼ 0,7 mm2/s para ambos métodos de sinterización.
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- 2023
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5. The Influence of Reagents on the Shape, Stability, and Toxicity of AgNPs and Their Use to Produce Polymer-AgNPs Composites
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Oksana Velgosova, Lívia Mačák, Vladimír Mára, Erika Múdra, Marek Vojtko, Maksym Lisnichuk, and Elena Čižmárová
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chemical synthesis ,silver nanoparticles ,UV-VIS spectroscopy ,TEM ,long-term stability ,toxicity ,Mining engineering. Metallurgy ,TN1-997 - Abstract
The aim of this work was to propose a simple method for synthesizing differently shaped AgNPs and to find a suitable stabilizing/capping agent to ensure the non-toxicity of AgNPs. Using a chemical method, by simply changing the volume of reducing agents, we successfully prepared colloids of differently shaped AgNPs (spherical (~10 nm), triangular (~40 nm), rodlike (~30 nm), and a mixture of these shapes). The nanoparticle sizes and shapes affect the solution color. UV-VIS spectroscopy was used to evaluate the colloidal solutions, and transmission electron microscopy was used to analyze the shape and size of the nanoparticles. To create non-toxic and stable AgNPs, it is necessary to modify the surface properties of the nanoparticles; one possibility is to create a biocompatible layer on the nanoparticle surface. We successfully applied a combination of trisodium citrate and polyvinylpyrrolidone, thereby preventing the release of silver ions, which are responsible for the toxic effects of AgNPs. The synthesized nanoparticles show very low, mostly negligible antibiofilm activity against the green algae Chlorella kessleri. AgNPs were used to prepare polymer-AgNP composite thin layers and fibers. It was proved that AgNPs can influence polymer matrix properties.
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- 2023
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6. Porous Nb2O5 Nanofibers Prepared via Reactive Needle-Less Electrospinning for Application in Lithium–Sulfur Batteries
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Ivan Shepa, Erika Mudra, Dominika Capkova, Alexandra Kovalcikova, Ondrej Petrus, Frantisek Kromka, Ondrej Milkovic, Vitaliy Antal, Matej Balaz, Maksym Lisnichuk, Dominika Marcin-Behunova, Dóra Zalka, and Jan Dusza
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niobia ,nanofibers ,needle-less electrospinning ,oxide ceramics ,lithium–sulfur batteries ,Inorganic chemistry ,QD146-197 - Abstract
This contribution describes the preparation, coupled with detailed characterization, of Nb2O5 nanofibers and their application in lithium–sulfur batteries for the improvement of electrochemical performance. The utilization of reactive needle-less electrospinning allowed us to obtain, in a single step, amorphous pre-ceramic composite PAN/Nb2O5 fibers, which were transformed into porous ceramic Nb2O5 nanofibers via calcination. Thermogravimetric studies defined that calcination at 600 °C results in crystalline ceramic fibers without carbon residues. The fibrous morphology and mean diameter (614 ± 100 nm) of the ceramic nanofibers were analyzed via scanning and transmission electron microscopy. A surface area of 7.472 m2/g was determined through nitrogen adsorption measurements, while a combination of X-ray diffraction and Raman spectroscopy was used to show the crystallinity and composition of the fibers after calcination—single T-phase Nb2O5. Its performance in the cathode of lithium–sulfur batteries was defined through electrochemical tests, and the obtained results were compared to a similar blank electrode. The initial discharge capacity of 0.5 C reached a value of 570 mAh∙g−1, while the reversible capacity of 406 mAh∙g−1 was retained after 200 cycles, representing a capacity retention of 71.3%. The presence of Nb2O5 nanofibers in the carbon cathode inhibits the shuttle effect through polysulphide confinement, which originates from porosity and chemical trapping.
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- 2023
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7. In vivo study of light-driven naproxen release from gated mesoporous silica drug delivery system
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Miroslav Almáši, Anna Alexovič Matiašová, Monika Šuleková, Eva Beňová, Juraj Ševc, Lucia Váhovská, Maksym Lisnichuk, Vladimír Girman, Adriana Zeleňáková, Alexander Hudák, and Vladimír Zeleňák
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Medicine ,Science - Abstract
Abstract A drug delivery system based on mesoporous particles MCM-41 was post-synthetically modified by photo-sensitive ligand, methyl-(2E)-3-(4-(triethoxysilyl)-propoxyphenyl)-2-propenoate (CA) and the pores of MCM-41 particles were loaded with Naproxen sodium salt (NAP). The CA was used as a photoactive molecule that can undergo a reversible photo-dimerization by [2π + 2π] cycloaddition when irradiated with UV light of specific wavelengths. Thus, it has a function of gate-keeper that is responsible for opening/closing the pores and minimizing premature release of NAP. The physicochemical properties of the prepared system were studied by infrared spectroscopy (IR), nitrogen adsorption measurements, thermogravimetric analysis (TGA), scanning transmission electron microscopy (STEM) and energy dispersive X-ray spectroscopy (EDX). The mechanism of the opening/closing pores was confirmed by UV measurements. In vitro and in vivo drug release experiments and the concentration of released NAP was determined by UV spectroscopy and high-performance liquid chromatography (HPLC). In vivo drug release in the blood circulatory system of rats has demonstrated the effective photo-cleavage reaction of CA molecules after UV-light stimulation. The localization and morphological changes of the particles were studied in the blood and liver of rats at different time intervals. The particles in the blood have been shown to retain their original rod-like shape, and the particles in the liver have been hydrolysed, which has resulted in spherical shape with a reduced size.
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- 2021
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8. N-Acetylcysteine-Loaded Magnetic Nanoparticles for Magnetic Resonance Imaging
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Martina Kubovcikova, Radka Sobotova, Vlasta Zavisova, Iryna Antal, Iryna Khmara, Maksym Lisnichuk, Zuzana Bednarikova, Alena Jurikova, Oliver Strbak, Jana Vojtova, Pavol Mikolka, Jan Gombos, Alica Lokajova, Zuzana Gazova, and Martina Koneracka
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magnetic nanoparticles ,N-acetylcysteine adsorption ,physicochemical characterization ,MRI ,relaxometry ,relaxation time ,Biology (General) ,QH301-705.5 ,Chemistry ,QD1-999 - Abstract
Acute respiratory distress syndrome (ARDS) is a life-threatening condition characterized by the rapid onset of lung inflammation Therefore, monitoring the spatial distribution of the drug directly administered to heterogeneously damaged lungs is desirable. In this work, we focus on optimizing the drug N-acetylcysteine (NAC) adsorption on poly-l-lysine-modified magnetic nanoparticles (PLLMNPs) to monitor the drug spatial distribution in the lungs using magnetic resonance imaging (MRI) techniques. The physicochemical characterizations of the samples were conducted in terms of morphology, particle size distributions, surface charge, and magnetic properties followed by the thermogravimetric quantification of NAC coating and cytotoxicity experiments. The sample with the theoretical NAC loading concentration of 0.25 mg/mL was selected as an optimum due to the hydrodynamic nanoparticle size of 154 nm, the surface charge of +32 mV, good stability, and no cytotoxicity. Finally, MRI relaxometry confirmed the suitability of the sample to study the spatial distribution of the drug in vivo using MRI protocols. We showed the prevailing transverse relaxation with high transverse relaxivity values and a high r2(*)/r1 ratio, causing visible hypointensity in the final MRI signal. Furthermore, NAC adsorption significantly affects the relaxation properties of PLLMNPs, which can help monitor drug release in vitro/in vivo.
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- 2023
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9. The Influence of Manganese Addition on the Properties of Biodegradable Zinc-Manganese-Calcium Alloys
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Wanda Mamrilla, Zuzana Molčanová, Beáta Ballóková, Miroslav Džupon, Róbert Džunda, Dávid Csík, Štefan Michalik, Maksym Lisnichuk, and Karel Saksl
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zinc-based alloys ,microstructure ,mechanical properties ,hot extrusion ,synchrotron data ,EDX analysis ,Technology ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Microscopy ,QH201-278.5 ,Descriptive and experimental mechanics ,QC120-168.85 - Abstract
This study focuses on the preparation and characterization of zinc-based alloys containing magnesium, calcium, and manganese. The alloys were prepared by the melting of pure elements, casting them into graphite molds, and thermo-mechanically treating them via hot extrusion. The phase compositions of the samples were analyzed using X-ray diffraction technique and SEM/EDX analysis. The analysis confirmed that in addition to the Zn matrix, the materials are reinforced by the CaZn13, MgZn2, and Mn-based precipitates. The mechanical properties of the alloys were ascertained by tensile, compressive, and bending tests, measurement of the samples microhardness and elastic modulus. The results indicate that an increase in Mn content leads to an increase in the maximum stress experienced under both tension and compression. However, the plastic deformation of the alloys decreases with increasing Mn content. This study provides valuable insights into the microstructural changes and mechanical behavior of zinc-based alloys containing magnesium, calcium, and manganese, which can be used to design alloys for specific biomedical applications.
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- 2023
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10. Preparation, Structure, and Properties of PVA–AgNPs Nanocomposites
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Oksana Velgosova, Lívia Mačák, Erika Múdra, Marek Vojtko, and Maksym Lisnichuk
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nanoparticles ,silver ,polymer matrix nanocomposite ,PVA ,“ex situ” preparing ,Organic chemistry ,QD241-441 - Abstract
The aim of the work was to prepare a polymer matrix composite doped by silver nanoparticles and analyze the influence of silver nanoparticles (AgNPs) on polymers’ optical and toxic properties. Two different colloids of AgNPs were prepared by chemical reduction. The first colloid, a blue one, contains stable triangular nanoparticles (the mean size of the nanoparticles was ~75 nm). UV–vis spectrophotometry showed that the second colloid, a yellow colloid, was very unstable. Originally formed spherical particles (~11 nm in diameter) after 25 days changed into a mix of differently shaped nanoparticles (irregular, triangular, rod-like, spherical, decahedrons, etc.), and the dichroic effect was observed. Pre-prepared AgNPs were added into the PVA (poly(vinyl alcohol)) polymer matrix and PVA–AgNPs composites (poly(vinyl alcohol) doped by Ag nanoparticles) were prepared. PVA–AgNPs thin layers (by a spin-coating technique) and fibers (by electrospinning and dip-coating techniques) were prepared. TEM and SEM techniques were used to analyze the prepared composites. It was found that the addition of AgNPs caused a change in the optical and antibiofilm properties of the non-toxic and colorless polymer. The PVA–AgNPs composites not only showed a change in color but a dichroic effect was also observed on the thin layer, and a good antibiofilm effect was also observed.
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- 2023
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11. Transformation of Amorphous Terbium Metal–Organic Framework on Terbium Oxide TbOx(111) Thin Film on Pt(111) Substrate: Structure of TbxOy Film
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Helena Brunckova, Erika Mudra, Magdalena Streckova, Lubomir Medvecky, Tibor Sopcak, Ivan Shepa, Alexandra Kovalcikova, Maksym Lisnichuk, and Hristo Kolev
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metal–organic frameworks ,solvothermal synthesis ,amorphous TbMOF ,thin film ,terbium oxide ,microstructure ,Chemistry ,QD1-999 - Abstract
The present study is focused on the synthesis and structural properties of amorphous terbium metal–organic framework thin film (TbMOF-TF) and its transformation to terbium oxide by pyrolysis at 450 °C in the air. The crystalline (cTbMOF) and amorphous (aTbMOF) films were prepared by solvothermal synthesis using different amounts (0.4 and 0.7 mmol) of the modulator (sodium acetate), respectively. The powders were characterized by differential scanning calorimetry (DSC), thermogravimetry (TG), Fourier transform infrared (FTIR), Raman spectroscopy, and scanning electron microscopy (SEM). The varied chemical composition of the surface of TbMOFs and TbxOy was investigated by X-ray photoelectron spectroscopy (XPS). X-ray diffraction (XRD) and transmission electron microscopy (TEM) revealed that aTbMOF had been fully transformed to a Tb4O7 phase with a cubic crystal structure at 450 °C. The amorphous aTbMOF-TF film was prepared by dropping a colloidal solution of amorphous precursor nanocrystals on the SiO2/Si substrates covered with Pt as an interlayer. XPS confirmed the presence of Tb in two states, Tb3+ and Tb4+. The amorphous film has a rough, porous microstructure and is composed of large clusters of worm-like particles, while terbium oxide film consists of fine crystallites of cubic fluorite cF-TbOx, c-Tb4O7, and c-Tb2O3 phases. The surface topography was investigated by a combination of confocal (CM) and atomic force microscopy (AFM). The amorphous film is porous and rough, which is contrast to the crystalline terbium oxide film.
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- 2022
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12. Mechanochemical Synthesis of Nickel Mono- and Diselenide: Characterization and Electrical and Optical Properties
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Marcela Achimovičová, Michal Hegedüs, Vladimír Girman, Maksym Lisnichuk, Erika Dutková, Juraj Kurimský, and Jaroslav Briančin
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nickel selenide ,mechanochemical synthesis ,planetary ball mill ,nanostructured semiconductor ,electrical and optical properties ,Chemistry ,QD1-999 - Abstract
Nickel mono- (NiSe) and diselenide (NiSe2) were produced from stoichiometric mixtures of powdered Ni and Se precursors by the one-step, undemanding mechanochemical reactions. The process was carried out by high-energy milling for 30 and 120 min in a planetary ball mill. The kinetics of the reactions were documented, and the products were studied in terms of their crystal structure, morphology, electrical, and optical properties. X-ray powder diffraction confirmed that NiSe has hexagonal and NiSe2 cubic crystal structure with an average crystallite size of 10.5 nm for NiSe and 13.3 nm for NiSe2. Their physical properties were characterized by the specific surface area measurements and particle size distribution analysis. Transmission electron microscopy showed that the prepared materials contain nanoparticles of irregular shape, which are agglomerated into clusters of about 1–2 μm in diameter. The first original values of electrical conductivity, resistivity, and sheet resistance of nickel selenides synthesized by milling were measured. The obtained bandgap energy values determined using UV–Vis spectroscopy confirmed their potential use in photovoltaics. Photoluminescence spectroscopy revealed weak luminescence activity of the materials. Such synthesis of nickel selenides can easily be carried out on a large scale by milling in an industrial mill, as was verified earlier for copper selenide synthesis.
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- 2022
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13. Synthesis and Analysis of Polymorphic Silver Nanoparticles and Their Incorporation into the Polymer Matrix
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Oksana Velgosova, Livia Mačák, Maksym Lisnichuk, and Marek Vojtko
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silver nanoparticles ,chemical synthesis ,TEM ,optical properties ,Organic chemistry ,QD241-441 - Abstract
A chemical method was successfully used to synthesize silver nanoparticles (AgNPs) with various shapes. The shape of the nanoparticles affects the color of the colloid (spherical—yellow solution, triangular—blue, a mixture of spherical and triangular—green). The NaBH4, which acts as the main reducing agent and H2O2 have a significant impact on the shape of AgNPs. It has also been shown that the ratio between precursor, reducing, and the stabilizing agent is crucial for the formation of the required nanoparticles. The light sensitivity of AgNPs and the presence of H2O2 lead to a significant change in AgNPs’ shape and size with time and to the formation of the dichroic effect. UV–vis spectrophotometry, TEM, SEM/FIB, and EDX methods were used to analyze the shape, size, and composition of the nanoparticles. Polymer matrix composite with AgNPs was prepared by the “ex-situ” method.
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- 2022
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14. Nanostructure and Luminescent Properties of Bimetallic Lanthanide Eu/Gd, Tb/Gd and Eu/Tb Coordination Polymers
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Helena Brunckova, Erika Mudra, Lucas Rocha, Eduardo Nassar, Willian Nascimento, Hristo Kolev, Maksym Lisnichuk, Alexandra Kovalcikova, Zuzana Molcanova, Magdalena Strečkova, and Lubomir Medvecky
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coordination polymers ,metal-organic frameworks ,lanthanides ,solvothermal synthesis ,X-ray photoelectron spectroscopy ,luminescence ,Inorganic chemistry ,QD146-197 - Abstract
This study presents the synthesis, structural and luminescence properties for lanthanide metal–organic frameworks (LnMOFs), which belong to the sub-class of coordination polymers. The series of nanosized LnMOFs (Ln = Eu, Gd, Tb, Eu0.5Gd0.5, Tb0.5Gd0.5 and Eu0.5Tb0.5) was prepared by solvothermal synthesis using a modulator (sodium acetate). We investigated the various surface chemistry compositions of the isostructural LnMOFs with a [Ln(btc)] structure (BTC: Benzene-1,3,5-tricarboxylate) by X-ray photoelectron spectroscopy (XPS). The XPS confirmed the mixed-valent Eu3+ and Eu2+ compounds, and the presence of Tb in both +3 and +4 valence states, and one +3 valency of Gd. A nanostructure of mixed LnMOFs (EuGd, TbGd and EuTb) with a rod-like shape is related to luminescence properties. The MOFs (EuTb and EuGd) presented Comission Internationale de l’Éclairage (CIE) chromaticities of x = 0.666 and y = 0.331, and x = 0.654 and y = 0.348, respectively, in the red region. They were better than the values desired for use in commercial phosphors, which are x = 0.64 and y = 0.35. For [Tb/Gd(btc)], the CIE coordinates were x = 0.334 and y = 0.562, presenting emissions in the green region. Bimetallic LnMOFs are very promising UV light sensors for biological applications.
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- 2021
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15. Structural Evolution in Wet Mechanically Alloyed Co-Fe-(Ta,W)-B Alloys
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Vladimír Girman, Maksym Lisnichuk, Daria Yudina, Miloš Matvija, Pavol Sovák, and Jozef Bednarčík
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mechanical alloying ,amorphization ,nanocomposite ,local atomic structure ,X-ray scattering ,X-ray absorption spectroscopy ,Mining engineering. Metallurgy ,TN1-997 - Abstract
In the present study, the effect of wet mechanical alloying (MA) on the glass-forming ability (GFA) of Co43Fe20X5.5B31.5 (X = Ta, W) alloys was studied. The structural evolution during MA was investigated using high-energy X-ray diffraction, X-ray absorption spectroscopy, high-resolution transmission electron microscopy and magnetic measurements. Pair distribution function and extended X-ray absorption fine structure spectroscopy were used to characterize local atomic structure at various stages of MA. Besides structural changes, the magnetic properties of both compositions were investigated employing a vibrating sample magnetometer and thermomagnetic measurements. It was shown that using hexane as a process control agent during wet MA resulted in the formation of fully amorphous Co-Fe-Ta-B powder material at a shorter milling time (100 h) as compared to dry MA. It has also been shown that substituting Ta with W effectively suppresses GFA. After 100 h of MA of Co-Fe-W-B mixture, a nanocomposite material consisting of amorphous and nanocrystalline bcc-W phase was synthesized.
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- 2021
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16. The Influence of Manganese Addition on the Properties of Biodegradable Zinc-Manganese-Calcium Alloys
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Saksl, Wanda Mamrilla, Zuzana Molčanová, Beáta Ballóková, Miroslav Džupon, Róbert Džunda, Dávid Csík, Štefan Michalik, Maksym Lisnichuk, and Karel
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zinc-based alloys ,microstructure ,mechanical properties ,hot extrusion ,synchrotron data ,EDX analysis - Abstract
This study focuses on the preparation and characterization of zinc-based alloys containing magnesium, calcium, and manganese. The alloys were prepared by the melting of pure elements, casting them into graphite molds, and thermo-mechanically treating them via hot extrusion. The phase compositions of the samples were analyzed using X-ray diffraction technique and SEM/EDX analysis. The analysis confirmed that in addition to the Zn matrix, the materials are reinforced by the CaZn13, MgZn2, and Mn-based precipitates. The mechanical properties of the alloys were ascertained by tensile, compressive, and bending tests, measurement of the samples microhardness and elastic modulus. The results indicate that an increase in Mn content leads to an increase in the maximum stress experienced under both tension and compression. However, the plastic deformation of the alloys decreases with increasing Mn content. This study provides valuable insights into the microstructural changes and mechanical behavior of zinc-based alloys containing magnesium, calcium, and manganese, which can be used to design alloys for specific biomedical applications.
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- 2023
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17. Structural dependence of hydrogen evolution reaction on transition metal catalysts sputtered at different temperatures in alkaline media
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Miroslava Kozejova, Renata Bodnarova, Vitalii Latyshev, Maksym Lisnichuk, Vladimir Girman, Hoydoo You, and Vladimir Komanicky
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Fuel Technology ,Renewable Energy, Sustainability and the Environment ,Energy Engineering and Power Technology ,Condensed Matter Physics - Published
- 2022
18. Structural investigation of mechanically alloyed Co-Fe-Ta-B-Mo alloy
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Maksym Lisnichuk, Vladimír Girman, Daria Yudina, Andrej Baldovský, Pavol Sovák, and Jozef Bednarčík
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- 2023
19. Thermal stability of Fe-based BMGs investigated by high-energy X-ray scattering
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Vladimír Girman, Vladimír Kolesár, Maksym Lisnichuk, Daria Yudina, Andrej Baldovský, Pavol Sovák, and Jozef Bednarčík
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- 2023
20. A novel high entropy spinel-type aluminate MAl2O4 (M = Zn, Mg, Cu, Co) and its lithiated oxyfluoride and oxychloride derivatives prepared by one-step mechanosynthesis
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Markéta Zukalová, Klebson Lucenildo Da Silva, Olena Porodko, Monika Vinarčíková, Maksym Lisnichuk, Vladimir Šepelák, Vladimír Girman, Hristo Kolev, and Martin Fabián
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Crystallography ,chemistry.chemical_compound ,Materials science ,chemistry ,Aluminate ,Spinel ,engineering ,One-Step ,Mechanosynthesis ,Physical and Theoretical Chemistry ,engineering.material - Abstract
For the first time, a spinel-type high entropy oxide (Zn0.25Cu0.25Mg0.25Co0.25)Al2O4 as well as its derivative lithiated high entropy oxyfluoride Li0.5(Zn0.25Cu0.25Mg0.25Co0.25)0.5Al2O3.5F0.5 and oxychloride Li0.5(Zn0.25Cu0.25Mg0.25Co0.25)0.5Al2O3.5Cl0.5 are prepared in the nanostructured state via high-energy co-milling of the simple oxide precursors and the halides (LiF or LiCl) as sources of lithium, fluorine and chlorine. Their nanostructure is investigated by XRD, HR-TEM, EDX and XPS spectroscopy. It is revealed that incorporation of lithium into the structure of spinel oxide together with the anionic substitution has significant effect on its short-range order, size and morphology of crystallites as well as on its oxidation/reduction processes. The charge capacity of the as-prepared nanomaterials tested by cyclic voltammetry is found to be rather poor despite lithiation of the samples in comparison to previously reported spinel-type high entropy oxides. Nevertheless, the present work offers the alternative one-step mechanochemical route to novel classes of high entropy oxides as well as to lithiated oxyfluorides and oxychlorides with the possibility to vary their cationic and anionic elemental composition.
- Published
- 2021
21. PEI-Schiff base-modified mesoporous silica materials SBA-12, 15 and 16 for toxic metal ions capture (Co(II), Ni(II) and Cu(II)): Effect of morphology, post-synthetic modification and kinetic study
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Ľuboš Zauška, Tomáš Zelenka, Maksym Lisnichuk, Paula Pillárová, Veronika Kuchárová, Jozef Bednarčík, Mária Vilková, Satya Pal Nehra, Anshu Sharma, Vladimír Zeleňák, Virginie Hornebecq, and Miroslav Almáši
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Mechanics of Materials ,Materials Chemistry ,General Materials Science - Published
- 2023
22. Development and characterisation of a Y2Ti2O7-based glass-ceramic as a potential oxidation protective coating for titanium suboxide (TiOx)
- Author
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Andreas Chrysanthou, Milena Salvo, Fabiana D'Isanto, Maksym Lisnichuk, Hans-Peter Martin, Federico Smeacetto, Richard Sedlák, and Publica
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Suboxide ,Solid-state chemistry ,Materials science ,chemistry.chemical_element ,02 engineering and technology ,engineering.material ,01 natural sciences ,law.invention ,Coating ,law ,titanium suboxides ,0103 physical sciences ,Materials Chemistry ,glass-ceramics ,oxidation protective coating ,titanium suboxide ,010302 applied physics ,Glass-ceramic ,Process Chemistry and Technology ,Metallurgy ,glass-ceramic ,021001 nanoscience & nanotechnology ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,chemistry ,Ceramics and Composites ,engineering ,0210 nano-technology ,Titanium - Abstract
A silica-based glass-ceramic, with Y2Ti2O7 as the major crystalline phase, is designed, characterised and tested as an oxidation-protective coating for a tA silica-based glass-ceramic, with Y2Ti2O7 as the major crystalline phase, is ditanium suboxide (TiOx) thermoelectric material at temperatures of up to 600 °C. The optimised sinter-crystallisation treatment temperatures are found to be 1300 °C and 855 °C for a duration of 30 min, and this treatment leads to a glass-ceramic with cubic Y2Ti2O7 and CaAl2Si2O8 as crystalline phases. An increase of ~270 °C in the dilatometric softening temperature is observed after devitrification of the parent glass, thus further extending its working temperature range. Excellent adhesion of the glass-ceramic coating to the thermoelectric material is maintained after exposure to a temperature of 600 °C for 120 h under oxidising conditions, thus confirming the effectiveness of the T1 glass-ceramic in protecting the TiOx material.
- Published
- 2021
23. Magnetic Characterization and Thermal Stability of Gd50Co48Fe2 Metallic Glass
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Yu. Katuna, Karel Saksl, Maksym Lisnichuk, Štefan Michalik, M. Šuliková, Pavol Sovák, A. Kliuikov, Erik Čižmár, Beáta Ballóková, Zuzana Molčanová, S. I. Vorobiov, Vladimír Girman, and M. Fejerčak
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Materials science ,Amorphous metal ,General Physics and Astronomy ,Thermal stability ,Composite material ,Characterization (materials science) - Published
- 2020
24. Pei-Schiff Base-Modified Mesoporous Silica Materials for Toxic Metal Ions Capture: Effect of Morphology, Post-Synthetic Modification and Kinetic Study
- Author
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Lubos Zauška, Tomáš Zelenka, Maksym Lisnichuk, Paula Pillárová, Veronika Kuchárová, Anshu Sharma, Virginie Hornebecq, and Miroslav Almáši
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History ,Polymers and Plastics ,Business and International Management ,Industrial and Manufacturing Engineering - Published
- 2022
25. Magnetic performance of amorphous manganese nanoparticles doped with rare earth elements
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Pavol Hrubovčák, Adriana Zeleňáková, Anna Berkutova, Nataliia Mielnik, Nikolas Kiraly, Jaroslava Szücsova, Maksym Lisnichuk, Luboš Nagy, Jozef Bednarčík, Vladimír Girman, and Vladimír Zeleňák
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Condensed Matter Physics ,Electronic, Optical and Magnetic Materials - Published
- 2022
26. Dielectric and thermal performance of a C60-based nanofluid and a C60-loaded ferrofluid
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Michal Rajňák, Juraj Kurimský, Katarína Paulovičová, Marek Franko, Bystrík Dolník, Roman Cimbala, Milan Timko, Peter Kopčanský, Vladimír Girman, and Maksym Lisnichuk
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Fluid Flow and Transfer Processes ,Mechanics of Materials ,Mechanical Engineering ,Computational Mechanics ,Condensed Matter Physics - Abstract
Liquids in electrical devices often act as electrical insulators and cooling media. To enhance both dielectric and thermal properties of liquids, various nanoparticles can be dispersed in the liquids resulting in effective nanofluids. In this research, a new generation transformer oil prepared by a gas-to-liquid technology has been used to prepare a mono-nanofluid with fullerene C60 nanoparticles (0.01%w/V) and a hybrid nanofluid with C60 (0.01%w/V) and iron oxide nanoparticles (0.01%w/V), so-called C60-loaded ferrofluid. Both nanofluids and the oil were subjected to experimental investigation of frequency-dependent dielectric response, dielectric breakdown, and thermal conductivity at various temperatures. Finally, the three liquids were applied in a single-phase transformer, and temperature rise tests of the loaded transformer were conducted. The dielectric spectroscopy revealed three orders of magnitude higher dielectric losses in C60-loaded ferrofluid than in the oil and C60 nanofluid, where the losses are of conducting nature. In C60-loaded ferrofluid, an interfacial relaxation process is considered in addition. C60 particles in the oil increased its breakdown voltage by 17%, while the mixture of C60 and magnetic nanoparticles resulted in a 12.5% reduction of the breakdown voltage. The enhancement has been ascribed to the strong capacity of C60 to absorb electrons and their ability to weaken the photoionization in the head of the streamer. The thermal conductivity of both nanofluids decreases with temperature, and the effective medium theory can well predict it. A significant decrease in the transformer temperature rise up to 8 K has been found for C60 nanofluid, as compared with the temperature rise achieved with the transformer oil. The temperature rise was also reduced with C60-loaded ferrofluid (up to 5.6 K). The lower cooling efficiency of the hybrid nanofluid was attributed to the high dielectric losses generating undesirable heat with a counter-productive effect on the cooling process.
- Published
- 2022
27. Study of synergistic effects and compositional dependence of hydrogen evolution reaction on MoxNiy alloy thin films in alkaline media
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Renata Bodnarova, Miroslava Kozejova, Vitalii Latyshev, Serhii Vorobiov, Maksym Lisnichuk, Hoydoo You, Maros Gregor, and Vladimir Komanicky
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Process Chemistry and Technology ,Physical and Theoretical Chemistry ,Catalysis - Published
- 2022
28. Nanostructure and Luminescent Properties of Bimetallic Lanthanide Eu/Gd, Tb/Gd and Eu/Tb Coordination Polymers
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Zuzana Molčanová, Willian Nascimento, Eduardo J. Nassar, Helena Brunckova, Alexandra Kovalčíková, Lucas A. Rocha, Hristo Kolev, Erika Mudra, Lubomir Medvecky, Magdaléna Strečková, Maksym Lisnichuk, Lucas Rocha, and Hristo Kolev
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Lanthanide ,X-ray photoelectron spectroscopy ,Materials science ,Valence (chemistry) ,Solvothermal synthesis ,Crystallography ,coordination polymers ,luminescence ,Metal-organic framework ,lanthanides ,solvothermal synthesis ,Isostructural ,Luminescence ,Bimetallic strip ,metal-organic frameworks ,Inorganic chemistry ,QD146-197 - Abstract
This study presents the synthesis, structural and luminescence properties for lanthanide metal–organic frameworks (LnMOFs), which belong to the sub-class of coordination polymers. The series of nanosized LnMOFs (Ln = Eu, Gd, Tb, Eu0.5Gd0.5, Tb0.5Gd0.5 and Eu0.5Tb0.5) was prepared by solvothermal synthesis using a modulator (sodium acetate). We investigated the various surface chemistry compositions of the isostructural LnMOFs with a [Ln(btc)] structure (BTC: Benzene-1,3,5-tricarboxylate) by X-ray photoelectron spectroscopy (XPS). The XPS confirmed the mixed-valent Eu3+ and Eu2+ compounds, and the presence of Tb in both +3 and +4 valence states, and one +3 valency of Gd. A nanostructure of mixed LnMOFs (EuGd, TbGd and EuTb) with a rod-like shape is related to luminescence properties. The MOFs (EuTb and EuGd) presented Comission Internationale de l’Éclairage (CIE) chromaticities of x = 0.666 and y = 0.331, and x = 0.654 and y = 0.348, respectively, in the red region. They were better than the values desired for use in commercial phosphors, which are x = 0.64 and y = 0.35. For [Tb/Gd(btc)], the CIE coordinates were x = 0.334 and y = 0.562, presenting emissions in the green region. Bimetallic LnMOFs are very promising UV light sensors for biological applications.
- Published
- 2021
29. Structural Evolution in Wet Mechanically Alloyed Co-Fe-(Ta,W)-B Alloys
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Jozef Bednarcik, Miloš Matvija, Vladimír Girman, Daria Yudina, Pavol Sovák, and Maksym Lisnichuk
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Materials science ,Absorption spectroscopy ,Analytical chemistry ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,mechanical alloying ,Phase (matter) ,General Materials Science ,ddc:530 ,Spectroscopy ,local atomic structure ,X-ray absorption spectroscopy ,Mining engineering. Metallurgy ,Nanocomposite ,nanocomposite ,TN1-997 ,Metals and Alloys ,X-ray scattering ,021001 nanoscience & nanotechnology ,amorphization ,Nanocrystalline material ,0104 chemical sciences ,Amorphous solid ,Transmission electron microscopy ,magnetic properties ,0210 nano-technology - Abstract
Metals 11(5), 800 (1-19) (2021). doi:10.3390/met11050800, In the present study, the effect of wet mechanical alloying (MA) on the glass-forming ability (GFA) of Co$_{43}$ Fe$_{20}$ X$_{5.5}$ B$_{31.5}$ (X = Ta, W) alloys was studied. The structural evolution during MA was investigated using high-energy X-ray diffraction, X-ray absorption spectroscopy, high-resolution transmission electron microscopy and magnetic measurements. Pair distribution function and extended X-ray absorption fine structure spectroscopy were used to characterize local atomic structure at various stages of MA. Besides structural changes, the magnetic properties of both compositions were investigated employing a vibrating sample magnetometer and thermomagnetic measurements. It was shown that using hexane as a process control agent during wet MA resulted in the formation of fully amorphous Co-Fe-Ta-B powder material at a shorter milling time (100 h) as compared to dry MA. It has also been shown that substituting Ta with W effectively suppresses GFA. After 100 h of MA of Co-Fe-W-B mixture, a nanocomposite material consisting of amorphous and nanocrystalline bcc-W phase was synthesized., Published by MDPI, Basel
- Published
- 2021
30. Fabrication and characterization of high entropy pyrochlore ceramics
- Author
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Richard Sedlák, Ondrej Hanzel, Ivana Cvijović-Alagić, Jelena Erčić, Svetlana Butulija, Branko Matović, Maksym Lisnichuk, Jelena Zagorac, Dejan Zagorac, and Peter Tatarko
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Materials science ,Pyrochlore ,Spark plasma sintering ,Sintering ,Estructura de pirocloro ,02 engineering and technology ,engineering.material ,Thermal diffusivity ,01 natural sciences ,Industrial and Manufacturing Engineering ,law.invention ,Crystal structure prediction ,Crystal ,Crystallinity ,law ,High-entropy ceramics ,0103 physical sciences ,Densification ,Calcination ,Ceramic ,010306 general physics ,Predicción de la estructura cristalina ,Cerámica de alta entropía ,021001 nanoscience & nanotechnology ,Densificación ,Chemical engineering ,Mechanics of Materials ,visual_art ,Ceramics and Composites ,engineering ,visual_art.visual_art_medium ,0210 nano-technology ,Pyrochlore structure - Abstract
High-entropy rare-earth (RE) zirconates with pyrochlore structure were successfully fabricated by pressureless and spark plasma sintering. RE2Zr2O7 compound with nominal composition (La0.2Y0.2Gd0.2Nd0.2Sm0.2)Zr2O7 was prepared by simple glycine nitrate procedure (GNP). GNP process yielded powders with low crystallinity and after subsequent calcination, well crystalline ceramics were formed. During calcination defective fluorite (F-RE2Zr2O7) and crystal pyrochlore (Py-RE2Zr2O7) structures coexist. Formation of pure crystalline pyrochlore occurs after sintering at 1450°C. High-density ceramics, free of any additives, were obtained after powders compaction and pressureless (PS), as well as field assisted sintering technique (FAST) at 1450°C. Theoretical investigations of the high-entropy RE2Zr2O7 pyrochlore systems were performed. Unit cell parameter of the obtained Py-RE2Zr2O7 is 10.5892(2)Å and 10.5999(2)Å for PS and FAST sintering, respectively, which is in good agreement with the results of Density Functional Theory (DFT) calculations. The thermal diffusivity of sintered samples at room temperature was ∼0.7mm2/s for both sintering methods.ResumenSe fabricaron con éxito, mediante sinterización por plasma sin presión y por chispa, los circonatos de tierras raras (RE) de alta entropía con estructura de pirocloro. El compuesto RE2Zr2O7 con composición nominal (La0,2Y0,2Gd0,2Nd0,2Sm0,2)Zr2O7 se preparó mediante un procedimiento simple de nitrato de glicina (GNP). El proceso GNP produjo polvos con baja cristalinidad y después de la posterior calcinación, se formaron cerámicas bien cristalinas. Durante la calcinación coexisten estructuras defectuosas de fluorita (F-RE2Zr2O7) y pirocloro cristalino (Py-RE2Zr2O7). La formación de pirocloro cristalino puro se produce después de la sinterización a 1.450°C. Después de la compactación de polvos y sin presión (PS), así como por la técnica de sinterización asistida en campo (FAST) a 1.450 oC, se obtuvieron cerámicas de alta densidad, libres de aditivos. Se realizaron investigaciones teóricas de los sistemas de pirocloro RE2Zr2O7 de alta entropía. El parámetro de celda unitaria del Py-RE2Zr2O7 obtenido es 105.892(2) Å y 105.999(2) Å para la sinterización PS y FAST, respectivamente, lo que está de acuerdo con los resultados de los cálculos de la teoría funcional de la densidad (DFT). La difusividad térmica de las muestras sinterizadas a temperatura ambiente fue de ∼ 0,7 mm2/s para ambos métodos de sinterización.
- Published
- 2021
31. IrRe-IrOx electrocatalysts derived from electrochemically oxidized IrRe thin films for efficient acidic oxygen evolution reaction
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Renata Bodnarova, V. M. Latyshev, Oleg Shylenko, Alexandra Kovalčíková, Maros Gregor, Vladimir Komanicky, S. I. Vorobiov, and Maksym Lisnichuk
- Subjects
Materials science ,Chemical engineering ,General Chemical Engineering ,Electrochemistry ,Oxygen evolution ,Water splitting ,Sputter deposition ,Overpotential ,Electrocatalyst ,Amorphous solid ,Hydrogen production ,Catalysis - Abstract
Slow kinetics of oxygen evolution reaction (OER), combined with harsh conditions of acidic media, significantly limits the progress of large-scale hydrogen production by water splitting. Efficient, stable and less-expensive catalysts are required to overcome such restrictions. Herein, we report preparation of IrRe-IrOx based catalysts with record high mass activity. The electrocatalyst was prepared by magnetron sputtering deposition of metallic Ir-Re thin film with subsequent electrooxidation. The optimal composition of as-deposited Ir-Re catalyst was defined as Ir39Re61. During electrooxidation process Re atoms are dissolved promoting metallic Ir oxidation to highly active amorphous IrOx phase with high surface area. The IrRe-IrOx catalyst exhibits low OER overpotential of 248 mV at 10 mA•cm-2 current density and mass activity of 4400 mA•mg−1. High mass OER activity of the IrRe-IrOx catalyst is result of combination of high surface area, low catalyst loading and presence of amorphous IrOx on catalyst surface.
- Published
- 2021
32. Corrigendum to 'Characterization of B4C-SiC ceramic composites prepared by ultra-high pressure sintering' [J. Eur. Ceram. Soc. 41 (August) (2021) 4755–4760]
- Author
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Tatiana Prikhna, Branko Matović, Vladimír Girman, Jelena Maletaškić, Katsumi Yoshida, Vladimir Urbanovich, Ivana Cvijović-Alagić, Bratislav Todorović, and Maksym Lisnichuk
- Subjects
Materials science ,visual_art ,Materials Chemistry ,Ceramics and Composites ,visual_art.visual_art_medium ,Sintering ,Ceramic ,Ultra high pressure ,Composite material ,Characterization (materials science) - Published
- 2021
33. Atomic structure of Ca–Mg biodegradable metallic glass
- Author
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Beáta Ballóková, Karel Saksl, Miloš Fejerčák, L. Kapuscinský, Štefan Michalik, Maksym Lisnichuk, László Temleitner, Yu. Katuna, Vladimír Girman, Juraj Ďurišin, Pál Jóvári, Andrea Lachová, Zuzana Molčanová, Katarína Šuľová, and M. Šuliková
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Amorphous metal ,Materials science ,Mechanical Engineering ,Neutron diffraction ,Alloy ,Metals and Alloys ,02 engineering and technology ,engineering.material ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Atomic packing factor ,01 natural sciences ,0104 chemical sciences ,Crystal ,Condensed Matter::Materials Science ,Crystallography ,Mechanics of Materials ,Phase (matter) ,ddc:540 ,Materials Chemistry ,Tetrahedron ,engineering ,0210 nano-technology ,Eutectic system - Abstract
Journal of alloys and compounds 801, 651 - 657 (2019). doi:10.1016/j.jallcom.2019.06.120, Very low density eutectic Ca72Mg28 at.% alloy is a precursor of complex biodegradable alloys with potential use as bioresorbable alloy for orthopaedic applications. The structure of the amorphous alloy was investigated by using X-ray, neutron diffraction and reverse Monte Carlo (RMC) modelling. The RMC configuration was decomposed into polyhedral holes whose faces are all triangles consisting of chemical bonds. Free volumes in the respective polyhedral holes were evaluated with reference to the packing efficiency of crystalline CaMg2 HCP phase. The tetrahedral holes, accounting for about 55% of the whole space, are regarded as densely packed units because the average packing efficiency of them is approximately equal to that of the corresponding crystal phase. At the same time, various types of polyhedral holes which have a certain free volume have been observed, and some of them are connected with each other. The densely packed coordination polyhedra consisting only of tetrahedral holes tend to be clustered, Published by ScienceDirect, Amsterdam [u.a.]
- Published
- 2019
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34. Development of new biodegradable alloys for medical applications
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Karel Saksl, Juraj Ďurišin, Štefan Michalik, M. Šuliková, Katarína Šuľová, Slávka Martinková, Zuzana Molčanová, Miloš Fejerčák, Andrea Lachová, Beáta Ballóková, and Maksym Lisnichuk
- Subjects
Engineering ,business.industry ,Nanotechnology ,business - Published
- 2019
35. The Structural Characterization of Ni-Ti-Zr Metallic Glass
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Vladimír Girman, Yu. Katuna, Maksym Lisnichuk, Pavol Sovák, D. Balga, J. Gamcová, J. Kováč, Martin Ďurišin, and Karel Saksl
- Subjects
Amorphous metal ,Materials science ,Chemical engineering ,General Physics and Astronomy ,Characterization (materials science) - Published
- 2017
36. The Correlation between Magnetic and Structural Properties in Ni-Ti-Zr Metallic Glass
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Pavol Sovák, Maksym Lisnichuk, Yu. Katuna, Martin Ďurišin, D. Balga, J. Kováč, J. Gamcová, Karel Saksl, Peter Kollár, and Vladimír Girman
- Subjects
010302 applied physics ,Amorphous metal ,Materials science ,0103 physical sciences ,General Physics and Astronomy ,02 engineering and technology ,Composite material ,021001 nanoscience & nanotechnology ,0210 nano-technology ,01 natural sciences - Published
- 2017
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