Materials Literature
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The hydrogen content in CaZr1 − x Sc x O3 − x/2 (x = 0.00–0.20) and BaZr0.9Y0.1O3-α (for comparison) was studied by powder nuclear microanalysis. The samples were saturated with heavy water (D2O) vapors at 350 and 400°C in air. The chemical expansion of the CaZr0.95Sc0.05O3-α and BaZr0.95Y0.05O3-α samples at 700°C was…
This work addresses the formation of polymeric nanofibers containing magnetic nanoparticles using electrospinning assisted by a magnetic field. During electrospinning, two Helmholtz coils were mounted on the system in order to create a uniform magnetic field. Polymeric solutions containing PVDF, DMF and acetone with a…
We demonstrate activation of bright diamond single photon emitters in the near infrared range by thermal annealing alone, i.e., without ion implantation. The activation is crucially dependent on the annealing ambient. The activation of the single photon emitters is only observed when the sample is annealed in forming…
Static conductance of epitaxial graphene formed on metal and semiconductor substrates has been considered within a simple model.
Stainless steels are among the most investigated materials on biofouling and microbially-influenced corrosion (MIC). Although, generally corrosion-resistant owing to tenacious and passive surface film due to chromium, stainless steels are susceptible to extensive biofouling in sub-soil, fresh water and sea water and c…
Subject of the paper concerns determination of the feasibility and indication of the application scope of optical spectroscopy methods in the diagnosis of high-voltage insulators. Results of measurements of optical radiation emitted by partial and complete electrical discharges occurring on a support insulator model p…
The water-in-oil high internal phase emulsions were the subject of the study. The emulsions consisted of a super-cooled aqueous solution of inorganic salt as a dispersed phase and industrial grade oil as a continuous phase. The influence of the industrial grade oil type on a water-in-oil high internal phase emulsion s…
Conformal coatings are applied on printed circuit board assemblies (PCBAs) in order to protect the assembly from environmental influence and silicone-based coating is commonly used. A systematic study on the performance of silicone conformal coating in connection with process-related contaminants is the focus of this…
We have studied the spectral properties of mixtures formed by CdS colloidal quantum dots with an average diameter of 2.5 nm and methylene blue molecules and that are dispersed into gelatin. We have revealed that, in the presence of CdS quantum dots, the luminescence intensity of methylene blue increases. We suggest a…
Stainless steels are widely used in the Oil & Gas and chemical process industry. This group of materials is today available in a large variety of alloy compositions, and practically all product forms needed for a construction are available. A historical view and application examples are given on the stainless steel ev…
Core–shelled Zn/ZnO microspheres were prepared by ultrasonic irradiation to investigate their photocatalytic activity for degrading methyl orange in waste water. The microstructural and optical properties of the core–shelled Zn/ZnO microspheres were investigated by means of a scanning electron microscope, a transmissi…
The improvement of thee31,fcoefficient of domain-engineered BiFeO3films, which is one of the important parameters on piezoelectric MEMS application, is discussed. The (100) BiFeO3epitaxial films grown on SrRuO3/SrTiO3substrates have a rhombohedral structure with tetragonal distortion. It was found that the BiFeO3film…
The low-temperature glycine-nitrate combustion method was employed to synthesize nanopowders based on nonstoichiometric magnesium-aluminum spinel MgAl 2+δ O 4+1.5δ with the degree of nonstoichiometry δ = 0.76–9.48, whose average crystallite size decreases from 16 to 6 nm as spinel is enriched with alumina. Analysis of…
The conductivity and thermopower of a graphene monolayer formed on a tunable graphene bilayer have been studied within a simple model. It has been shown that kinks of the conductivity and peaks of the thermopower of the graphene monolayer appear near the edges of the band gap of the tunable graphene bilayer.
The diffusion permeability of triple junctions of high-angle tilt boundaries 〈111〉 and 〈100〉 and mixed-type boundaries in nickel has been investigated using the molecular dynamics method. It has been shown that the diffusion permeability of equilibrium triple junctions does not exceed the permeability of the grain bou…
We present a comparative study of the anomalous Hall effect (AHE) and of the transverse Kerr effect (TKE) in the nonstoichiometric alloys. The data on AHE and TKE are consistent with each other and clearly indicate the intrinsic above room-temperature ferromagnetic order in the studied samples. We argue that this orde…
Electrochemical deuteration of metastable Mg-Ti alloys is studied. To investigate the dynamics of deuterium atoms in the crystal host, the as-prepared hydrides are examined by means of NMR spectroscopy. Remarkably the host compound, which phase segregates upon gas phase deuteration at high temperatures, preserves its…
The results of DFT (GGA-PBEsol) and DFT(PBE)-D2 study of the band structure of zigzag graphene nanoribbons on hexagonal nitride boron 8-ZGNR/h-BN(0001) are presented, suitable as potential base for new materials for spintronics. It offers a study of regularities in the changes of the valence band electron structure an…
Brazil cultural heritage is composed by numerous constructions that describe the various historical periods lived by country. Constructions arent in good conservation status, showing systematically some deterioration level of their structural elements, among them those of wood. Restoration process aims to preserve the…
Recent advances in the fabrication, characterization and application of micro- and nano-particles that possess a non-uniform internal structure are reviewed. The particle structures include core-shell particles, particles with multiple cores or a multi-layered structure, porous particles with both regular and random p…