Na Ln 4 Mo 3 O 15 F, Ln = Sm–Tb, was synthesized via solid-phase method. Luminescence and electrochemical properties were investigated both theoretically and experimentally for the cubic Eu/Sm phases. Mixed conductivity reached ca . 10 −3 S cm −1 at 800 °C.

Halogenated rare-earth molybdates of the NaLn4Mo3O15F (Ln = Sm-Tb) nominal composition were synthesized via a solid-state route and investigated for their structural, thermal, IR spectroscopic, luminescent, and ionic transport properties. The study demonstrated that lanthanide cation size critically governs structural symmetry. Guided by symmetry analysis, Sm and Eu were prioritized for investigation as they stabilize the cubic fluorite-like framework, which exhibits superior ionic conductivity, whereas smaller cations (Gd, Tb) form low-conductivity monoclinic oxymolybdates. Fluorine incorporation and oxidative annealing significantly modulated oxygen interstitial content, as evidenced by lattice parameter variations and luminescence spectroscopy, which confirmed europium's oxidation state transition (Eu2+ <-> Eu3+). Here, the conductive properties of NaSm4Mo3O15F (NSMF) and NaEu4Mo3O15F (NEMF) were studied for the first time. Crystal chemical analysis of ionic conductivity revealed approximately equal oxygen migration barriers, with an estimated value of about 0.5 eV for 3D oxygen diffusion. The results of kinetic Monte Carlo simulations demonstrated oxygen ionic conductivity of about 10-2-10-3 S cm-1 at 800 degrees C. To estimate the electronic contribution, density functional theory calculations were performed for band gaps calculations, which turned out to be ca. 0.6 eV. Conductivity measurements demonstrated a similar order of anionic conductivity, with enhanced electronic contributions under reducing conditions. Thermal analysis linked suppressed phase transitions in NSMF/NEMF to lattice rigidity caused by smaller lanthanides, contrasting with flexible lattices in MLn4Mo3O15F (M = Li, Na; Ln = La, Pr, Nd). These findings highlight fluorine's role in tuning oxygen mobility and underscore the interplay between cation size, lattice dynamics, and conductivity for intermediate-temperature solid oxide fuel cell applications.

Two-component ionogels containing clay minerals such as montmorillonite K10 (Mnt-K10), bentonite (Bent), and halloysite (Hly), as well as imidazolium-based ionic liquids (ILs) were prepared in present work. The ILs that were used in the synthesis included a bis(trifluoromethylsulfonyl) imide anion (TFSI-) and various cations: 1-ethyl-3-methylimidazolium (EMIm(+)), 1-propyl-3-methylimidazolium (PMIm(+)), 1-butyl-3-methylimidazolium (BMIm(+)), and 1-butyl-2,3-dimethylimidazolium (BDMIm(+)). The thermal behavior of the synthesized ionogels and neat ILs was investigated using differential scanning spectroscopy (DSC) and thermogravimetric analysis (TG). It was found that the thermograms of PMImTFSI, BMImTFSI, and BDMImTFSI showed inflections corresponding to glass-transition, which shifted towards higher temperatures with the introduction of aluminosilicate. The largest shifts compared to the neat ILs were observed for IL/Bent ionogels. It was assumed that the identified differences in the thermal behavior between the neat and clay-entrapped ILs (confinement effect) are associated with an increased role of ion-wall interactions compared to ion-ion interactions. When studying the thermal stability of the materials under consideration, two opposite trends were noted. On the one hand, the characteristic temperatures of thermal decomposition of the synthesized ionogels were lower than those for the neat ILs. But on the other hand, when introducing aluminosilicate into any IL, a decrease in the maximum rate of thermal decomposition was observed in accordance with series of IL > IL/Mnt-K10 > IL/Hly > IL/Bent.

Abstract—Nonwoven fibrous materials based on polylactide (PLA) and ozonide of oleic acid triglyceride (glycero-(9,10-trioxolane)-trialeate) in a range of concentrations of 1–5 wt

In the current study, Cu2O/CuO, Cu2O/Cu nanopowders and bimetallic Ag/Cu/Cu2O nanoparticles were successively synthesized using solution combustion, reduction, and co-precipitation methods. XRD, SEM-EDX, FTIR, and TG analysis have been used to characterize and study the synthesized materials. The structure, morphology and elemental composition of the powders were evaluated. It was found that the pH of the medium affected the morphological parameters of the Ag/Cu/Cu2O particles. The synthesized Ag/Cu/Cu2O samples showed fungicidal activity against Fusarium oxysporium 280 phytopathogens. Nanoparticles synthesized at pH = 9 and pH = 7 had a high inhibitory activity and formed a lysis zone with the sizes of 27 and 24 mm, respectively. The results obtained can be used to suppress specific fungal infections of cotton.

The current research deals with the urgent task of creating highly efficient photocatalysts for wastewater treatment from various organic pollutants. For these purposes, we carried out a mechanochemical synthesis, heat treatment, and study of a non-toxic, thermally and chemically stable catalysts with a heterostructure based on Fe2TiO5 pseudobrookite. The morphology and the properties of the as-prepared composites were characterized through different techniques. The chemical reactions occurring during the step-by-step heat treatment of the samples were proposed using info from XRD analysis, IR spectroscopy, thermal analysis, and mass spectra. The influence of the gaseous medium on the phase composition and the degree of crystallinity of materials has been established. The analysis of the elemental composition and morphology of powder particles was carried out at an annealing temperature in the range from 100 to 1000 degrees C in air. The photocatalytic activity of pseudobrookite was studied during the decomposition of the organic dye Rhodamine B, and the mechanism of photocatalysis asso-ciated with the absorption of photons and the formation of an electron-hole pair was considered. It was found that samples thermally treated in nitrogen were demonstrated greater catalytic activity than those treated in air.

This paper presents comparative data on the structural, thermal, and mechanical characteristics, the work of adhesion as well as the anti-mold activity of composites based on PVA and Ag–Cu structures. A one-stage method for obtaining polymer composites with Ag–Cu using underwater pulsed plasma is considered. Two- and three-stage chemical methods for obtaining Ag–Cu structures with/without using the stabilizer (chitosan and polyvinylpyrrolidone) are also compared. The incorporation of the filler into the polymer matrix is confirmed by XRD patterns and FTIR spectroscopy data. The results of thermal and mechanical tests have shown that the synthesis method and the nature of the stabilizer allow the creation of more platy composites. The introduction of Ag–Cu fillers increases the resistance to UV radiation and changes the work of adhesion. The method of production, the concentration of the filler, and the nature of the stabilizer affect the anti-mold activity of the composites. Analysis of obtained results, PVA/Ag–Cu composites can be considered promising food packaging materials.

A detailed study of the physical properties of the new cubic LiEu 4 Mo 3 O 15 F phase has been conducted. This study reveals a reversible phase transition accompanied by a jump in anionic conductivity to a value of 10 −2 S cm −1 at 700 °C in this material.

The powdered bentonite/iron oxide composite material was synthesized by chemical co-precipitation. The grain size composition, morphology, crystal structure, porosity, and thermal stability of the obtained powder were investigated. It was established that iron oxide exists in the composite as the maghemite/magnetite solid solution with the formula Fe 2.950 O 4 . An increase in the viability of the bacterium Escherichia coli M-17 after culturing in the nutrient medium in the presence of the synthesized bentonite/iron oxide powder was found.

For the synthesis of ionogels containing microcrystalline cellulose (MCC) and Na-bentonite (Na-Bent), ionic liquid (IL) 1-butyl-3-methylimidazolium acetate was used as an MCC solvent. Characterization and research of the physicochemical properties of the synthesized materials were carried out using methods such as SEM, WAXS, thermal analysis, FTIR, conductometry, and viscometry. WAXS analysis showed an increase in the interlayer distance of Na-bentonite in composites due to the intercalation of IL molecules. Based on the data on the characteristic temperatures of thermal degradation, enhanced thermal stability of triple IL/Na-Bent/MCC ionogels was revealed compared to that for cellulose-free systems. It was found that the electrical conductivity of both triple IL/Na-Bent/MCC and binary IL/MCC ionogels was non-monotonous. The data obtained can be used in the formation of multifunctional coatings with enhanced thermal stability.

Mechanical dispersion was used to modify ethyl cellulose with the particles of bentonite clay. The prepared ethyl cellulose/bentonite composite film materials were characterized by optical microscopy and X‑ray diffraction. The thermal behaviors of both the films and the initial polymer powder were studied by using differential scanning calorimetry. It was found that the introduction of bentonite reduced the characteristic temperatures of glass transition and melting of the polymer material.

Ethyl cellulose (EC) was filled with bentonite (Bent) particles by mechanical dispersion to produce composite film materials that were studied using various methods. According to X-ray diffraction (XRD) analysis, the inter-chain separation length was larger in EC/Bent composite then those in pure polymer. Infrared spectrometry indicated a formation of hydrogen bonds between the hydroxyl groups of EC and the silanol groups of clay. Tests showed an increase in tensile strength of the polymer material (by 35-40%) when doped with bentonite. It was found that modification of polymer with bentonite resulted in increasing of the adsorption efficiency of methylene blue (MB): the equilibrium concentration of MB ions in adsorbent phase increased 2.5 times. The MB adsorption kinetics obeyed the pseudo-first-order mechanism. Isotherms were in good agreement with Langmuir model. For the composite, the maximum monolayer adsorption capacity was 4 times higher than that for pure polymer.

A comparative analysis is performed to determine the effect Cu2+ doping has on chemical and phase compositions, along with the effect the conditions of the formation of features of complex oxide powders have on their photocatalytic activity.

An investigation is performed of synthesized halloysite/magnetite composite materials and their porous structure, surface morphology, and physicochemical properties. It is established that the halloysite/magnetite composite samples have values of the effective field of anisotropy and coercive force that are higher than those found for magnetite.

X-ray structural analysis, Mössbauer spectroscopy, and ab initio calculations are used to study the structural properties and refine the orientation of intracrystalline fields in FeBO 3 crystals in the region of the magnetic phase transition. It is found that in the temperature range of 293–403 K, the trigonal lattice parameters increase monotonically. Analysis of the electron density distribution maps does not show visible local disordering over the entire investigated temperature range. It is found that iron borate has an axially symmetric electric field gradient (EFG) whose main axis is directed along [001]. This orientation is maintained above and below the Néel point. In the magnetically ordered state of the crystal, the main axis of the EFG is orthogonal to the direction of the hyperfine magnetic field at iron nuclei. The results obtained will be used to develop a theoretical model of the formation of hyperfine structure in iron borate, which is important for applications of such crystals in next-generation synchrotron technologies.

Bimetallic Cu/Ag nanoparticles with a controlled shape and size were obtained by chemical reduction. According to scanning electron microscopy, powder X-ray diffraction, and Fourier transform IR spectroscopy data, core–shell type particles composed of a silver coating on the surface of copper nanoparticles were formed at n (Cu 2+ /Ag + ) = 0.33 mol/mol. It was shown that bimetallic Cu/Ag nanoparticles have higher thermal stability than monometallic Cu and Ag nanoparticles taken separately. The bimetallic nanoparticles were found to exhibit antimicrobial activity against some pathogenic microorganisms, which is of interest for the development of medicinal agents.

Halloysite/magnetite composite material was synthesized by the chemical coprecipitation of iron salts in halloysite pores. Halloysite, magnetite and halloysite/magnetite samples were characterized by a number of physicochemical methods. According to X-ray diffraction analysis, data of SEM and TEM, magnetic nanoparticles were embedded in the clay mineral matrix. Using the nitrogen adsorption-desorption technique it was found that powders under study can be attributed to mesoporous bodies with a small fraction of macropores. For the first time, fractal models were used to describe the porosity of the studied materials. The values of the fractal dimension (as a quantitative characteristic of inhomogeneity) were found in the range of 2.5–3. Infrared spectrometry indicated a formation of the hydrogen bonds between the oxygen-containing groups of magnetite and halloysite. The biological activity of halloysite and the halloysite/magnetite composite was investigated and it was found that in the presence of these powders, the viability of E. coli M-17 bacteria increased 2–3 times in comparison with the control sample.

A halloysite/magnetite composite material is synthesized via the chemical coprecipitation of iron salts in halloysite pores. The efficiency of removing of a methylene blue thiazine dye from aqueous solutions is investigated using the obtained composite as an adsorbent. A unified model that combines the equilibrium and kinetics of adsorption is used to obtain a mathematical description of the adsorption process. It is shown that unlike standard models of adsorption kinetics (pseudo-first and -second order), the unified model allows us to determine the true rate constant of the process, which is independent of the initial concentration of the dye in a solution.