Materials Literature
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We present Kinetic Monte Carlo simulations based on a simple atomic model of diffusion in alloys under irradiation. The model takes into account the creation of point defects, recombination of close vacancy–interstitial pairs and point defect elimination at sinks. It is applied to simple cases of coupling between radi…
A direct comparison of aqueous and non‐aqueous tape casting was investigated. Aqueous and non‐aqueous formulations were developed for tape casting of aluminum nitride (AlN) powder. The oxygen content of the AlN powder in aqueous ball‐milling media had a slight increase, but it did not almost influence the thermal cond…
The degeneracy of the yellow 1S orthoexcitons in Cu2O is lifted by wave vector dependent electron-hole exchange. This interaction scales quadratically with k and strongly depends on the direction of the wave vector. Therefore it is interpreted as an anisotropic correction of the effective exciton mass. This can explai…
The glass formation area in the ternary ZnO-CdO TeO 2 was investigated at 1200°C by melting 33 different compositions. Only a narrow zone of the ternary composition system gives rise to transparent, opalescent and partly crystallised glasses. All these glassy materials were obtained by using a conventional melt quench…
In this paper, the quasicrystalline model and the differential evolution strategy are applied to analyze the effective electromagnetic properties of composite materials with aligned nonspherical inclusions. The relationship between the effective wave number, volume concentration, direction of wave propagation vector,…
Concentration and elemental composition of the total suspended particulates (TSP) emitted \ndue to manufacturing activities of an enamelware industry in Lagos, Nigeria were investigated. \nGravimetric method was used in mass concentration determination and an energy dispersive x-ray \nfluorescence (ED-XRF)…
As a result of irradiation, pressurized helium bubbles are observed in large number densities in some metals, which produce mechanical property changes. This paper presents the results of a computational multi-scale study (dislocation dynamics, DD, and molecular dynamics simulations, MD) to quantify the effect of He b…
Fuel cells have the potential to solve several major challenges in the global energy economy: dependence on petroleum imports, degradation of air quality, and greenhouse gas emissions. Using catalyst-based reformer technology, hydrogen for fuel cells can be derived from infrastructure fuels such as gasoline, diesel, a…
This work studies the influence of the sintering conditions of a Ti-6Al-4V alloy on its corrosion performance. The alloy was vacuum sintered in different conditions of time and temperature. The density and microstructure (designating phase distribution) are evaluated. Corrosion resistance through electrochemical techn…
Abstract The reaction of tellurium, antimony, antimony trichloride, sodium chloride, and an excess of aluminium trichloride in a closed evacuated glass ampoule yields dark red crystals of (Sb 2 Te 2 )[AlCl 4 ]. During the reaction a melt is formed from which needle shaped crystals of the title compound grow on sublima…
Density-functional-based molecular dynamics simulations were used to study the mechanical and electronic properties of armchair and zigzag carbon nanotubes (CNTs) under axial elongation. The strain–stress response and the rupturing process depend both on the type of CNT and on the temperature. The conductance of metal…
ZnS:Mn 2+ nanocrystals of 3 nm in diameter were coated with silica to form 20±4 nm core/shell particles, as observed by transmission electron spectroscopy. For ZnS:Mn 2+ nanocrystals modified with silica, the intensity of photoluminescence (PL) due to the d-d transition of Mn 2+ increases with increasing tetraethyl or…
Carbon films have been deposited on quartz and single-crystal silicon substrates by pulsed laser deposition technique. The soot for the target was obtained from burning camphor, a natural source. The effect of nitrogen (N) incorporation in camphoric carbon film is investigated. Optical gap for the undoped film is abou…
A new class of non-carbon nanotubes based on Group III and Group V elements (aluminum and phosphorus, respectively) is considered. The equilibrium geometry, energy characteristics, and electronic structure of the AlP nanotubes were calculated using the density functional theory. These calculations demonstrated that th…
The spectral characteristics of the SiF 4 molecule in the range 3100–700 cm −1 , including the absorption range of the band ν 3 , are studied in the gas phase at P = 0.4–7 bar and in solutions in liquefied Ar and Kr. In the cryogenic solutions, the relative intensities of the vibrational bands, including the bands of…
Alkylsamarium(III) complexes of a dimetalated modified porphyrinogen have been synthesized that have strong structural resemblance to samarocene(III) alkyl complexes. The monomeric complexes are free of alkali metals, halides, and coordinating solvent. The methyl and (trimethylsilyl)methyl complexes have been characte…
Abstract This paper deals with the discovered property of additional steel strengthening (superstrengthening), which is observed at high cooling rates within the martensite range. It has been shown that the cooling intensification before the martensite start (Ms) does not result in the additional strengthening of the…
A collection of Pseudomonas corrugata and P. mediterranea strains, two closely related species, was evaluated for the presence and variability of pha loci. Using PCR methods that specifically amplify segments of medium-chain-length poly(hydroxyalkanoate) (mcl-PHA) synthase genes, we demonstrated the presence of phaC1…
Abstract The mechanisms of pyrolysis in He and reduction in H 2 of a Ni(ktfaa) 2 chelate and nickel film deposition on copper substrates are discussed. The Ni films produced by CVD with the Ni(ktfaa) 2 chelate as a precursor are continuous. Pyrolysis of the Ni(ktfaa) 2 chelate takes place above 300 °C. The hydrogen at…
Thin film titanium/poly-para-xylylene nanocomposites with controlled Ti content are prepared by vacuum coevaporation and cocondensation of Ti and paracyclophane. The structure and chemical composition of as-deposited samples and the changes of electrical resistivity, which they undergo upon heating, are studied by ato…