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Publications (66)
Reconstructive and regenerative bone surgery is based on the use of high-tech biocompatible implants needed to restore the functions of the musculoskeletal system of patients. Ti6Al4V is one of the most widely used titanium alloys for a variety of applications where low density and excellent corrosion resistance are required, including biomechanica...
Synthetic calcium silicates and phosphates are promising compounds for targeted drug delivery for the effective treatment of cancerous tumors, and for minimizing toxic effects on the patient's entire body. This work presents an original synthesis of a composite based on crystalline wollastonite CaSiO 3 and combeite Na 4 Ca 4 (Si 6 O 18), using a se...
Because of the unique crystal framework, bronze TiO2 (or TiO2(B)) is considered the prospective choice for high-performance lithium-ion battery anodes. Nevertheless, TiO2(B) requires efficient modification, e.g., suitable doping with other elements, to improve the electronic properties and enhance the stability upon insertion/extraction of guest io...
Nanocrystalline layer-structured monoclinic Na2Ti3O7 is currently under consideration for usage in solid state electrolyte applications or electrochemical devices, including sodium-ion batteries, fuel cells, and sensors. Herein, a facile one-pot hydrothermal synthetic procedure is developed to prepare self-assembled moss-like hierarchical porous st...
A new approach to the use of rice straw as a difficult-to-recycle agricultural waste was proposed. Potassium aluminosilicate was obtained by spark plasma sintering as an effective material for subsequent immobilization of ¹³⁷Cs into a solid-state matrix. The sorption properties of potassium aluminosilicate to ¹³⁷Cs from aqueous solutions were studi...
An effective sorption material for the immobilization of cobalt radionuclides into highly safe and reliable solid-state matrices is proposed. The resulting silicate sorbent СaSiO3 had an amorphous mesoporous structure (ABET 53 m²/g) and a sorption capacity Co ions of 3.32 mmol/g. The physico-chemical characteristics of the СaCoSi2O6 sample obtained...
An effective sorption material for cesium radionuclides immobilization in highly safe and reliable solid-state matrices was proposed. Prepared aluminosilicate (КAlSi 3 O 8) adsorbent had amorphous mesoporous structure and Cs + ions sorption capacity of ~3.7 mmol/g. The physical-chemical characteristics of (Cs, К)AlSi 3 O 8 sample saturated with Cs...
The problem of water contamination by long-living cesium and strontium radionuclides is an urgent environmental issue. The development of facile and efficient technologies based on nanostructured adsorbents is a perspective for selective radionuclides removal. In this regard, current work aimed to obtain the nanostructured magnetic zeolite composit...
The paper presents an original method for the template synthesis of biomimetic porous composites using polyferrophenylsiloxane (PFPS) and the skeleton of the sea urchin Strongylocentrotus intermedius as a structuring template. The study aimed to form an organosilicon base of a composite with an inverted structure relative to the original structure...
Nickel- and zinc-doped TiO2(B) nanobelts were synthesized using a hydrothermal technique. It was found that the incorporation of 5 at.% Ni into bronze TiO2 expanded the unit cell by 4%. Furthermore, Ni dopant induced the 3d energy levels within TiO2(B) band structure and oxygen defects, narrowing the band gap from 3.28 eV (undoped) to 2.70 eV. Oppo...
This article describes an original sol-gel (template) method for the synthesis of a dispersed form of nanostructured wollastonite (CaSiO3), its gold nanoparticles (40–60 nm) functionalized form CaSiO3/Au-NPs, and its composite in the composition with 20 mass% of hydroxyapatite CaSiO3/HAp and synthetic hydroxyapatite, that are widely used in medicin...
The paper studies efficient Al2O3−Ce:YAG and Al2O3−Ce:(Y,Gd)AG composite ceramic phosphors produced by reactive vacuum sintering. As one of the possible routes for microstructure optimization, effect of isothermal holding time was considered. The correlation between microstructural parameters (the ratio of average grain size of the matrix and therm...
The paper studies spark plasma sintering (SPS) of industrially used UO2-based fuel containing integral fuel burnable absorber (IFBA) of neutrons Gd2O3. Densification dynamics of pristine UO2 powder and the one added with 2 and 8 wt.% of Gd2O3 under ultrasonication in liquid has been studied under SPS conditions at 1050, 1250, and 1450 °C. Effect of...
The article presents an original way of getting porous and mechanically strong CaSiO3-HAp ceramics, which is highly desirable for bone-ceramic implants in bone restoration surgery. The method combines wet and solid-phase approaches of inorganic synthesis: sol-gel (template) technology to produce the amorphous xonotlite (Ca6Si6O17·2OH) as the raw ma...
Titanium dioxide have received a much attention for lithium-ion batteries due to safety as anode upon fast and low temperature cycling as well as appropriate stability during insertion and extraction of guest ions. However, TiO2 has low conductivity and sluggish diffusion of Li⁺. In order to eliminate these shortcomings, reducing of particle size a...
UO2-based nuclear fuel containing integral fuel burnable absorbers (IFBA) is an economically and technically efficient solution for optimization of nuclear power reactors operation. The paper studies a new way to obtain compound UO2-Eu2O3 pellet fuel using an unconventional spark plasma sintering technology (SPS). Earlier unknown data on densificat...
The study describes direct precipitation, original template, and additional thermal reduction methods for the synthesis of materials based on cobalt oxides and their composites, promising as magnetic sorbents for the selective extraction and preconcentration of uranium(VI) from aqueous media. The thermal decomposition of intermediates and the phase...
The evolution of the pore structure of ceramics 0-4 at% Nd3+:Y3Al5O12 at the initial and intermediate stages of sintering was studied by the nitrogen physical adsorption. It was shown that the maximum decrease in the specific surface area (by 70÷83 %) and the total volume of nanopores (by 84÷92 %) at the sintering temperature range of 1100-1500°C i...
TiO2-B/anatase nanotubes doped by vanadium have been synthesized through a facile one-step hydrothermal reaction. The material shows a mesoporous structure with a specific surface area of 179.1 m² g⁻¹. XPS data presume the presence of V³⁺, V⁴⁺, V⁵⁺, and Ti³⁺ in doped TiO2-B/anatase. As found by XRD and EIS investigations, the vanadium expands bronz...
The paper studies synthetic osteoplastic powder biocomposite, which is bioactive and extremely relevant for bone defect recovery in dentistry and maxillo-facial surgery. Biocomposite fabrication strategy is based on an original sol-gel (template) synthesis of the porous wollastonite containing 30 wt.% of hydroxyapatite. The way to tailor porosity i...
Composite nanopowders Y2O3-MgO (1: 1 by volume) were synthesized by the method of self-propagating glycine-nitrate synthesis with an excess of glycine and nitric acid. It was shown that freshly prepared powder (precursor) contains about 19% of unreacted components and intermediate reaction products, which are removed by subsequent calcining. Crysta...
Polyphenylsiloxanes containing magnesium (polymagnesiumphenyl siloxanes) with Si:Mg ratios of 1:1.5 and 1:2 have been synthesized by the exchange reaction in a mixture of benzene (toluene)–dimethyl sulfoxide with yields of 58 and 72%, respectively. The composition and structure of the synthesized polymers have been studied by the methods of positro...
The paper presents template strategy using siloxane-acrylate latex and its modified form to prepare nanostructured calcium silicate (wollastonite) containing nanosized gold and regular porosity. Optimal conditions for the annealing of silicate xerogel were outlined leading to nanoporous wollastonite with minimal porous defects (pore size correspond...
The effect of green bodies’ mesostructure on the porosity, optical properties and laser performance of reactive sintered Y3Al5O12:Nd3+ transparent ceramics was studied. Only minor changes in microstructure were revealed for green bodies without annealing and those annealed at 600, 800, 1000°C, while average pore size increases to 140 nm for sample...
TiO2-B nanobelts have been synthesized by hydrothermal route using TiO2-anatase precursors with different microstructure. The decrease in average size of starting product improves the degree of TiO2-B crystallinity and increases the surface area. Both of them strongly influence on the electrochemical performance of as-prepared TiO2-B: the capacity...
High selectivity and ion-exchange character of birnessite-type sorbents make these materials promising for Sr-90 removal from radioactive wastes containing seawater. However, it is still debatable how their functional properties are related to the nature of active phases and structure and, therefore, routes to improve birnessite performance are vir...
The possibility of using spark plasma sintering (SPS) for preparing high-density ceramic matrices suitable for firm long-term immobilization of Cs radionuclides was examined. The kinetic features of sintering and phase formation of natural zeolite from the Far Eastern deposit, loaded with the adsorbed Cs ions (surrogate of radiocesium), under noneq...
The work presents a novel method for fabrication of the high-quality ionizing radiation source (IRS), which is promising to replace unsafe commercial products based on ¹³⁷ CsCl prohibited by IAEA. Spark plasma sintering (SPS) technique has been applied to produce dense ceramic and glass-ceramic matrixes from Cs-containing (˜13.5 wt.%) zeolite yield...
Direct sol-gel, novel template, and additional high-temperature reduction procedures for preparing iron oxides and their composites, showing promise for selective sorption of dissolved U(VI) from aqueous media of various acidities, are described. The sorption activity of the materials was studied, the kinetic curves of the sorption were obtained, a...
The article is devoted to the evolution of structural, morphological, and sorption characteristics of layered manganese oxide (birnessite) under various conditions close to the real operating regime of the sorbents for radioactive waste processing. To identify the phase composition in the birnessites, we implemented XRD analysis, while SEM and temp...
Oxide materials based on TiO2 (anatase) and doped with Nb⁵⁺ cations have been fabricated by the template sol-gel method. Two types of templates were used: activated carbon fiber and siloxane-acrylate emulsion. The morphology and structure of the samples have been studied and the conditions of their surface have been characterized. It has been demon...
New nanostructured mesoporous materials of the composition TiO2/ZrO2/SiO2 were prepared by the template sol–gel method using a siloxane–acrylate emulsion as a template. The morphology and structure of these materials and their ability to take up U(VI) were studied. The influence of various factors (ZrO2 content, pH of solution) on the sorption prop...
Spark plasma sintering (SPS) is a highly prospective technology providing rapid consolidation of nano-disperse compositions into structured ceramics with complex structural organization. Characterizing pore structure of such systems remains a challenge due to different types, size and shape of the pores as well as structural defects occurring in th...
Annealing temperature of green bodies has been shown to influence greatly the optical properties and laser characteristics of Y3Al5O12:Nd3+ (1 at.%) ceramics. Increase the annealing temperature above some critical one (800°C) results in appearance of submicron pores due to Y4Al2O9 phase formation accompanied by specific volume expansion. The energy...
The prospective method of spark plasma sintering-reaction synthesis (SPS-RS) for fabrication of ceramics based on ZrO2 and biocompatible with living tissue is presented. Nanostructured ceramics has high mechanical strength (more than 400 MPa) and controlled porosity depending on specified sintering conditions. Biocompatible phases Ca10(PO4)6(OH)2 a...
Polyphenyl siloxanes containing chromium, iron, and aluminum in the backbone chain have been synthesized. The structure of the obtained staircase nano-metal complexes has been studied by the methods of XRD analysis and IR, ²⁹Si and ²⁷Al NMR, and XPS spectroscopy and scanning electron microscopy. Physical-chemical characteristics of these compounds...
Two types of nanostructured materials have been synthesized by the template sol-gel method. It has been demonstrated that the structure of nanostructured samples is determined, first of all, by the type of the used template. At using the carbon template, the Zr-dopant enters the structure of TiO2 (anatase), thus distorting the crystal lattice. Usin...
The nanostructured Zr-, Hf-, and Mo-doped anatase TiO2 microtubes has been synthesized via a template solgel method on a carbon fiber. The correlation between synthesis conditions of materials and their structure and morphology was investigated in detail by means of scanning electron microscopy, small-angle X-ray scattering, transmission electron m...
Natural clay samples and calcined clay varieties treated with hydrochloric acid of various strengths were characterized by X-ray diffraction, positron annihilation spectroscopy, and IR spectroscopy. The specific surfaces and pore sizes were determined by nitrogen adsorption. The constituent phases of the clay were found to be nontronite, muscovite,...
Porous ceramic materials were produced by hot pressing of a nanocrystalline (19 nm) silicon carbide powder synthesized by a hybrid method that combined the sol–gel processing of a finely divided and chemically reactive SiO2–C system and the carbothermic synthesis at moderate (1400°C) temperature in a vacuum. It was studied how such characteristics...
A method for the production of porous SiC-ceramics from finely dispersed starting system SiO2–C by means of single-stage carbothermal process involving spark plasma sintering at moderate temperatures (≤1800 °C) is proposed. Synthesis of finely-dispersed SiO2–C system was performed by sol–gel as follows: tetraethoxysilane was hydrolyzed in the prese...
Molybdenum compounds are industrially demanding as heterogeneous catalysts for oxidation of various organic substances. Highly porous structure of molybdenum-containing catalysts avoids surface's colmatation and prevents blocking catalytic sites that makes these materials play a key role in processes of hydrothermal oxidation of radionuclide organi...
Here we present a prospective method of sol-gel synthesis of highly porous wollastonite ceramic powders with controlled macroporous structure (mean pore size ~160 nm) and immobilized gold nanoparticles (particle size is less than 50 nm). The method's distinction is based on using the colloidal template (micelles of "core-shell" polymer latex) both...
The sorption of phosphate ions on macroporous synthetic calcium silicates has been studied and it has been evaluated whether the latter are suitable to serve as sorbents of geochemical barriers preventing phosphorus losses from agricultural soils.
The original way of synthesis of nanostructured iron oxides and based on them magnetic ceramics via sequential combination of sol-gel and SPS technologies has been suggested. High quality of nanostructured iron oxides is defined by porous structure (Sspec up to 47,3 м²/г) and by phase composition of mixed and individual crystal phases (γ-Fe2O3/Fe3O...
The results of Spark Plasma Sintering (SPS) synthesis of different types of ceramic materials for various industrial applications are presented. A high quality of ceramics is achieved through the originality of the developed approach based on combining SPS technology with other methods of inorganic synthesis, for instance, with sol–gel technology....
Modified forms of the natural and annealed at 700°C kaolinite have been fabricated by treatment using hydrochloric acid of different concentrations. The resulting samples were investigated using X-ray fluorescence spectroscopy, X-ray diffraction analysis, IR spectroscopy, and positron annihilation spectroscopy, scanning electron microscopy, etc. Th...
The sorption properties of materials based on iron oxides and their reduced forms with respect to uranium were studied. A description was made of a method for consolidation of porous iron oxides and its effect on such characteristics as porosity, magnetism, morphology, phase composition, and sorption properties. The mechanism of uranium sorption on...
In this work, we suggest a novel synthetic route combining sol–gel and SPS for the fabrication of porous ceramics based on wollastonite with bimodal pore size distributions (100–500 nm and 1–500 μm) and high mechanical strength (Young's modulus from 72.5 to 172 MPa). We studied peculiarities in the formation of the biporous silicate framework using...
Kovdor (Karelia) deposite vermiculites modified by acid of different concentrations and chitosan were studied using positron annihilation lifetime spectroscopy, measuring apparent density, dye adsorption, nitrogen adsorption by BET and porometry. It has been shown that after acidizing vermiculite density changes comparing to the samples’ density de...
The consolidation of highly porous nanostructured wollastonite powders was conducted via Spark Plasma Sintering (SPS) technique, and porous composite materials of high mechanical strength were obtained (Young׳s modulus over 60 MPa). Peculiarities of structural parameters variation of studied materials under SPS conditions within the temperature int...
The composition and structure of vermiculite samples modified successively with hydrochloric acid and chitosan are studied with the use of X-ray fluorescence and X-ray-diffraction analyses, as well as IR spectroscopy. The adsorption characteristics of the samples with respect to nitrogen and different dyes are determined, and the parameters of thei...
Here we report on the sol–gel synthesis of porous inorganic materials based on manganese, molybdenum, and tungsten compounds using the “core–shell” siloxane-acrylate latex as a template. The chemical composition and structural characteristics of the materials obtained have been investigated. It was shown that temperature conditions and gaseous medi...
The method of template sol-gel synthesis of tungsten oxide-based macroporous materials using ‘core-shell’ latex particles as colloid templates is described. The chemical composition and structural characteristics of the synthesized macroporous oxide systems have been investigated. The peculiarities of formation of materials phase composition and ma...
1 The porous structure of the produced materials was studied using the methods of Hg porosimetry, low� temperature nitrogen adsorption and scanning elec� tron microscopy (SEM). The catalytic activity of the synthesized macroporous catalysts was studied in the process of the liquidphase oxidation of methylene blue and hydrothermal oxidation of CoEDT...
In this work, consideration is given to the feasibility of using hydrothermal oxidation for the destruction of organic 60Co complexes during the course of the treatment of medium-level liquid radioactive wastes with a high salt content—evaporator
concentrate in the reactor water cleanup system—formed at nuclear power plants (NPPs). It has been show...
One of the main problems of liquid radioactive waste (LRW) management is concerned with treatment of decontamination waters containing organic ligands. The organic ligands like oxalic, citric and ethylenediaminetetraacetic acids form stable complexes with radionuclides which puts restrictions on application of many technologies of LRW management. O...
