Dysprosium-Doped Glass-Ceramics From the System NaO-AlO-SiO-BO-DyO.

Glasses from the system NaO-AlO-SiO-BO-DyO are prepared with three different concentrations of the Dy ion-0.5, 1, and 2 at%. Glass-ceramics are obtained after thermal treatment of the parent glass at 580°С and 630°С during 2, 5, and 24 h.

Elaboration and Characterization of Different Zirconium Modified ETS Photocatalysts for the Degradation of Crystal Violet and Methylene Blue.

In this study, Zirconium-modified Engelhard Titanium Silicate 4 (Na-K-ETS-4/xZr) catalysts were synthesized and evaluated for their photocatalytic efficiency in degrading crystal violet (CV) and methylene blue (MB) in aqueous solutions. The catalysts were characterized using XRD, FTIR, SEM, WDXRF, and nitrogen adsorption/desorption isotherms. The results confirmed the successful incorporation of Zr into the ETS-4 framework, with the highest Zr content reaching 9.

Novel Thiourea Ligands-Synthesis, Characterization and Preliminary Study on Their Coordination Abilities.

Two series of polydentate ,,-ligands containing thiourea fragments attached to a -cresol scaffold, unsymmetrical mono-acylated bis-amines and symmetrical bis-thioureas, are obtained by common experiments. It is observed that the reaction output is strongly dependent on both bis-amine and thiocarbamic chloride substituents. The products are characterized by 1D and 2D NMR spectra in solution and by single crystal XRD.

A Study of the Influence of Thermoactivated Natural Zeolite on the Hydration of White Cement Mortars.

One trend in the development of building materials is the partial or complete replacement of traditional materials that have a high carbon footprint with eco-friendly ecological raw materials and ingredients. In the present work, the influence of replacing cement with 10 wt% thermally activated natural zeolite on the structural and physical-mechanical characteristics of cured mortars based on white Portland cement and river sand was investigated. The phase compositions were determined by wavelength dispersive X-ray fluorescence (WD-XRF) analysis, X-ray powder diffraction (PXRD), diffuse reflectance infrared Fourier transformed spectroscopy (DRIFTS), and scanning electron microscopy (SEM), as well as thermogravimetric analysis simultaneously with differential scanning calorimetry (TG/DTG-DSC).

Enhanced Photocatalytic Performance under Ultraviolet and Visible Light Illumination of ZnO Thin Films Prepared by Modified Sol-Gel Method.

Semiconductor oxides are frequently used as active photocatalysts for the degradation of organic agents in water polluted by domestic industry. In this study, sol-gel ZnO thin films with a grain size in the range of 7.5-15.

Crystal structure of bis-(β-alaninium) tetra-bromidoplumbate.

The title compound, poly[bis-(β-alaninium) [[di-bromido-plumbate]-di-μ-di-bromido]] {(CHNO)[PbBr]} or (-AlaH)PbBr, crystallizes in the monoclinic space group 2/. The (PbBr) anion is located on a general position and has a two-dimensional polymeric structure. The Pb center is holodirected.

Crystal structure of hexa-glycinium dodeca-iodo-triplumbate.

The crystal structure of hexa-glycinium tetra-μ-iodido-octa-iodido-triplumbate, (CHNO)[PbI] or (GlyH)[PbI], is reported. The compound crystallizes in the triclinic space group . The [PbI] anion is discrete and located around a special position: the central Pb ion located on the inversion center is holodirected, while the other two are hemidirected.

Hybrid Cellulosic Substrates Impregnated with Meta-PBI-Stabilized Carbon Nanotubes/Plant Extract-Synthesized Zinc Oxide-Antibacterial and Photocatalytic Dye Degradation Study.

Novel fibrous cellulosic substrates impregnated with meta-polybenzimidazole (PBI)-stabilized carbon nanotubes/zinc oxide with different weight content of ZnO and with the use of dimethylacetamide as dispersant media. The pristine ZnO nanoparticle powder was prepared by plant extract-mediated synthesis using L. The green synthesized ZnO possesses an average crystallite size of 15 nm.

Functionalization of 2-Mercapto-5-methyl-1,3,4-thiadiazole: 2-(ω-Haloalkylthio) Thiadiazoles vs. Symmetrical Bis-Thiadiazoles.

A study on the functionalisation of 2-mercapto-5-methyl-1,3,4-thiadiazole has been conducted, yielding two series of products: 2-(ω-haloalkylthio)thiadiazoles and symmetrical bis-thiadiazoles, with variable chain lengths. The experimental conditions were optimised for each class of compounds by altering the base used and the reagents' proportions, leading to the development of separate protocols tailored to their specific reactivity and purification needs. The target halogenide reagents and bis-thiadiazole ligands were obtained either as single products or as mixtures easily separable by chromatography.

The Ce-Ni-Si System Revisited: More Homologue Compounds?

The nickel-rich region of the system Ce-Ni-Si has been reinvestigated utilizing X-ray single-crystal, powder, and electron diffraction as well as electron microprobe and thermal analyses. Two novel hexagonal compounds, τ-CeNiSi and τ'-CeNiSi were identified. The crystal structure of τ-CeNiSi was derived from single-crystal X-ray diffraction and found to be isotypic with the SmNiP-type structure (S.

LiGeO-LiCaGeО phase equilibria and LiCaGeO solid solutions.

Detailed studies of the LiGeО-LiCaGeО system by solid-phase syntheses of various compositions from pure LiGeО to pure LiCaGeО in the temperature range from 25 to 1125 °C is investigated for a first time. Solid state synthesis powders are characterized by X-ray and DSC/TG methods. Concentration and temperature two-phase regions of LiGeО and LiCaGeО as well as two-phase regions of LiCaGeО and LiCaGeO are established.

Self-Assembled Molecular Complexes of 1,10-Phenanthroline and 2-Aminobenzimidazoles: Synthesis, Structure Investigations, and Cytotoxic Properties.

Three new molecular complexes (phen)(2-amino-Bz)(H)(BF)·3HO , (phen)(2-amino-5(6)-methyl-Bz)(H)(BF)·HO , and (phen)(1-methyl-2-amino-Bz)(H)(BF) , were prepared by self-assembly of 1,10-phenanthroline (phen) and various substituted 2-aminobenzimidazoles. Confirmation of their structures was established through spectroscopic methods and elemental analysis. The X-ray diffraction analysis revealed that the crystal structure of is stabilized by the formation of hydrogen bonds and short contacts.

Vibrational entropy of disordering in omphacite.

Unlabelled: The cations of an ordered omphacite from the Tauern window were gradually disordered in piston cylinder experiments at temperatures between 850 and 1150 °C. The samples were examined by X-ray powder diffraction and then investigated using low-temperature calorimetry and IR spectroscopy. The low-temperature heat capacity data were used to obtain the vibrational entropies, and the line broadening of the IR spectra served as a tool to investigate the disordering enthalpy.

Electronic and Structural Properties of MPtB (M = Y, Yb): Structural Disorder in an Octahedral Boron Framework.

Two new ternary platinum borides, YPtB and YbPtB, were obtained by argon-arc melting of the elements followed by annealing at 780 °C (750 °C). The structures of these compounds combine the fragments of CaB- and AuCu-type structures [space group 3̅; = 1.15, = 4.

Polycarboxy/Sulfo Betaine-Calcium Phosphate Hybrid Materials with a Remineralization Potential.

Biomacromolecules control mineral formation during the biomineralization process, but the effects of the organic components' functionality on the type of mineral phase is still unclear. The biomimetic precipitation of calcium phosphates in a physiological medium containing either polycarboxybetaine (PCB) or polysulfobetaine (PSB) was investigated in this study. Amorphous calcium phosphate (ACP) or a mixture of octacalcium phosphate (OCP) and dicalcium phosphate dihydrate (DCPD) in different ratios were identified depending on the sequence of initial solution mixing and on the type of the negative functional group of the polymer used.

Mg, Zn Substituted Calcium Phosphates-Thermodynamic Modeling, Biomimetic Synthesis in the Presence of Low-Weight Amino Acids and High Temperature Properties.

The preparation of specially doped calcium phosphates (CaPs) is receiving a great deal of attention from researchers due to CaPs' enhanced capabilities for application in medicine. Complexation and precipitation in a complicated electrolyte system including simulated body fluids that are enriched with Mg and Zn ions and modified with glycine, alanine and valine were first evaluated using a thermodynamic equilibrium model. The influence of the type and concentration of amino acid on the incorporation degree of Mg and Zn into the solid phases was predicted.

Polydentate ,-Ligands Possessing Unsymmetrical Urea Fragments Attached to a -Cresol Scaffold.

In this study, three series of polydentate ,-ligands possessing unsymmetrical urea fragments attached to a -cresol scaffold are obtained, namely mono- and bi-substituted open-chain aromatics, synthesised using a common experiment, as well as fused aryloxazinones. Separate protocols for the preparation of each series are developed. It is found that in the case of open-chain compounds, the reaction output is strongly dependent on both bis-amine and carbamoyl chloride substituents, while oxazinones can be effectively obtained via a common protocol.

Effect of Water on CO Adsorption on CaNaY Zeolite: Formation of Ca(HO)(CO), Ca(HO)(CO) and Ca(HO)(CO) Complexes.

Efficient CO capture materials must possess a high adsorption capacity, suitable CO adsorption enthalpy and resistance to water vapor. We have recently reported that Ca cations exchanged in FAU zeolite can attach up to three CO molecules. Here we report the effect of water on the adsorption of CO.

Novel Electrospun Composite Membranes Based on Polyhydroxybutyrate and Poly(vinyl formate) Loaded with Protonated Montmorillonite for Organic Dye Removal: Kinetic and Isotherm Studies.

The use of biodegradable polyesters derived from green sources and their combination with natural abundantly layered aluminosilicate clay, e.g., natural montmorillonite, meets the requirements for the development of new sustainable, disposable, and biodegradable organic dye sorbent materials.

Capturing CO by ceria and ceria-zirconia nanomaterials of different origin.

Ceria and ceria-zirconia nanomaterials of different origin were studied in order to elucidate the role of their structural and textural characteristics in controlling the performance towards CO capture. Two commercial cerias and two home-prepared samples, CeO and CeO-ZrO (75% CeO) mixed oxide, were investigated. The samples were characterized by a number of analytical techniques including XRD, TEM, N-adsorption, XPS, H-TPR, Raman and FTIR spectroscopy.

A retrospection on the content, association, and significance of mercury in coals and coal ashes from Bulgarian thermoelectric power stations.

A short overview on the content, association, and significance of toxic Hg in 9 coal types and their fly ashes (FAs) from 12 Bulgarian thermoelectric power stations (TPSs) was conducted by a compilation of reference and our own data obtained by a combination of different chemical and mineralogical analyses, and separation procedures. The Bulgarian and Ukrainian coals studied are enriched in Hg (0.14-0.

Thermal Behavior Changes of As-Received and Retrieved Bio-Active (BA) and TriTanium (TR) Multiforce Nickel-Titanium Orthodontic Archwires.

Multiforce nickel-titanium (NiTi) orthodontic archwires release progressively increasing forces in a front-to-back direction along their length. The properties of NiTi orthodontic archwires depend on the correlation and characteristics of their microstructural phases (austenite, martensite and the intermediate R-phase). From a clinical and manufacturing point of view, the determination of the austenite finish (Af) temperature is of the greatest importance, as in the austenitic phase, the alloy is most stable and exhibits the final workable form.

Bigel Formulations of Nanoencapsulated St. John's Wort Extract-An Approach for Enhanced Wound Healing.

This study aimed to develop a semisolid vehicle for topical delivery of nanoencapsulated St. John's wort (SJW) extract, rich in hyperforin (HP), and explore its wound-healing potential. Four nanostructured lipid carriers (NLCs) were obtained: blank and HP-rich SJW extract-loaded (HP-NLC).