Materials Literature
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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…
Abstract Several salts of 1-methyl-4-[4-(dimethylamino)phenylethynyl]pyridinium 1, whose ethenyl analogue 2 is the cation of DAST (1-methyl-4-{2-[4-(dimethylamino)phenyl]ethenyl}pyridinium p-toluenesulfonate), were synthesized, and these properties were investigated. From a molecular-orbital calculation, the hyperpola…
The critical importance of interstitial impurities in bcc metals has been well established over many years. Ab initio calculations based on the density functional theory offer a powerful means to revisit this subject and the present article is focused on the interactions of C and N atoms with point defects in Fe. The…
Heat capacity of halogen-bridged one-dimensional binuclear metal complex (so-called MMX chain) having four n-pentyl groups, Pt2(n-PenCS2)4I, was measured by adiabatic calorimetry. A first-order phase transition was observed at 207.4 K when measurement was made after cooling from room temperature. The enthalpy and entr…
Carbon steel is joined to aluminium using the ultrasonic brazing method with Zn–Al filler at 663 K, employing different ultrasound application times. Different reaction layers could be observed at the interface, containing compounds such as FeAl 3 , Fe 2 Al 5 , Fe 3 Al, and FeAl, and solid solutions such as Fe–Zn and…
An optical technique for eliminating the inaccuracy in the measurement of retardation caused by multiple-beam interference in anisotropic multilayer-structured thin film is developed by the detailed analysis of obliquely incident transmission ellipsometry. The director distribution of a nematic liquid crystal inside a…
Abstract ZnO nanowires and related materials are promising structures for new electronic and optical applications and devices. In the present article featured as Editor's Choice [1], ZnPbO nanowires have been synthesized and studied by structural and photoluminescence investigations. The cover picture shows in the low…
Abstract Einkristalle von [NH 3 CH 3 ][Gd(Cl 2 HCCOO) 4 ] wurden durch Reaktion von Gd 2 O 3 mit NH 3 CH 3 Cl in einer wässrigen Lösung von Cl 2 HCCOOH erhalten. Die Verbindung kristallisiert triklin in der Raumgruppe P 1¯ (Nr. 2, Z = 2, a = 811, 5 pm, b = 1228, 4 pm, c = 1228, 9 pm, α = 62, 43°, β = 87, 67°, γ = 84,…