Materials Literature
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Selective oxidation of primary carbon-hydrogen bonds with oxygen is of crucial importance for the sustainable exploitation of available feedstocks. To date, heterogeneous catalysts have either shown low activity and/or selectivity or have required activated oxygen donors. We report here that supported gold-palladium (…
With a growing world population, an increasing standard of living in many developing countries, a limited supply of fossil fuels, and its adverse effect on the environment, the need for clean and sustainable energy has never been greater. Hydrogen, the simplest and most abundant element in the universe, has the potent…
The optical property and the structural states of vanadium ions were studied by multiple spectra (UV-visible, IR, Raman, and electron paramagnetic resonance (EPR)) in LAS glass and glass-ceramics. The color of glasses changed drastically from light yellow-green to claret during crystallization, the optical absorption…
Abstract Phase morphology and evolution during solidification process of polypropylene and poly(ethylene‐ co ‐octene) (PP/PEOc) blend in an internal mixer was investigated by means of scanning electron microscopy (SEM) and in‐line back small‐angle laser scattering (BSALS). The average particle diameter ( d p ) and the…
Abstract Laboratory exposures have been performed simulating a selective catalytic reduction (SCR) system with urea injection for NO x reduction in diesel exhaust after‐treatment. The corrosion behaviour of three ferritic and one austenitic stainless steel was examined using X‐ray photoelectron spectroscopy (XPS) and…
Resistivity recovery (RR) data of Cr4 alloy doped with carbon (Cr4C) after irradiation with 5 MeV electrons are presented and compared with RR data of non-doped Cr4 alloy. Analysis of the defect- and short-range order-induced parts of RR has confirmed the proposed earlier scheme of the evolution of Frenkel pair defect…
Abstract Internal oxidation phenomena during decarburization annealing are very important in the manufacturing process of grain oriented electrical steel. In the present study, the internal oxidation of nearly pure Fe–3%Si alloy was investigated, as a basic study for decarburization annealing. Annealing was performed…
Abstract The surface morphology, chemical, optical, and structural response of 1.25 MeV gamma rays irradiation at various doses ranging from 16 to 300 kGy on Kapton polymer samples were studied by using scanning electron microscope (SEM), Fourier Transform Infrared (FTIR), ultraviolet/visible absorption (UV/VIS) and X…
Abstract Hyperbranched polyesteramides (HB 1 and HB 2 ) were prepared by the bulk reaction between phthalic anhydride (PhAn) with either diisopropanolamine (DiPA) or diethanolamine (DEA), respectively. The hyperbranched polyesteramides were characterized by IR, GPC, 1 H‐NMR, and thermal analysis (TGA and DSC). The eff…
Abstract Amorphous to crystalline phase transformations in thermally evaporated GeTe films have been analyzed by using the resistivity–temperature curves and optical spectroscopic techniques. The phase‐transition temperature increases slightly with annealing temperature, while a large change in the sheet resistance an…
Phosphors of Eu2+-doped BaO-SiO2 compounds composed of a major BaSiO3 phase and a minor Ba2SiO4 phase were synthesized by a solid-state method at 1200°C under CO atmosphere. An enhancement of the photoluminescence of Eu2+ up to 18 times has been achieved by mixing ZnO into the composition. The composition-optimized ph…
The electronic properties and the thermoelectric power factors in the metal-band-insulator crossover of the perovskite-type oxygen deficient system SrTiO(3 - δ/2) with 0.0046 ≤ δ < 0.06 are explored through measurements of x-ray diffraction, electrical resistivity, thermoelectric power, Hall coefficient and magnetic s…
Abstract Resistive memory switching was investigated in titanates and niobates of the type A n B n O 3 n +2 and in the high‐ T c superconductor Bi 2 Sr 2 CaCu 2 O 8+δ . We studied the switching by current injection perpendicular to the layers. Both dc and pulsed measurements were performed. Out‐of‐plane transport prop…
Dislocation junctions and jogs in a free-standing FCC thin film have been studied using three-dimensional dislocation dynamics simulations. Due to the unconstrained motion of surface nodes and dislocation annihilation at the free surface, junctions and jogs are unstable except for some uncommon conditions. If the film…
Sulfur (S) is introduced as an additive in the growth atmosphere of carbon nanotubes (CNTs) in the range of 940-1020°C. CNT products with distorted sidewalls can be obtained by S-assisted growth. Moreover, many fascinating CNT structures can also be found in samples grown with S addition, such as bamboo-like CNTs, twi…
Abstract The viscoelastic relaxation of linear styrene–butadiene–styrene triblock copolymer ( l ‐SBS) and star styrene–butadiene–styrene triblock copolymer ( s ‐SBS) with four arms were investigated with differential scanning calorimetry and dynamic rheological measurements. Three characteristic viscoelastic responses…
The fabrication of three kinds of ZnO nanowire arrays with different structural parameters over Au-coated silicon (100) by facile thermal evaporation of ZnS precursor is reported, and the growth mechanism are proposed based on structural analysis. Field emission (FE) properties and wetting behavior were revealed to be…
Abstract The effects of organoclay type, compatibilizer, and the addition order of components during melt‐blending process on the morphology and thermal, mechanical, and flow properties of ternary nanocomposites based on low‐density polyethylene (LDPE) were investigated. As a compatibilizer, ethylene/methyl acrylate/g…
Abstract Undoped and 0.56 at.% Sb‐doped ZnO thin films were prepared by pulsed laser deposition (PLD) under vacuum and an oxygen pressure of 0.2 Pa with sintered ceramic as targets. The effects of Sb doping and deposition atmosphere on structure and optical–electrical properties of the films were studied by X‐ray diff…
Schwarzes Gold – aber kein Öl: Ein nanoporöser schwarzer Goldfilm bildet sich durch Anodisierung von Gold in einer Oxalatlösung. Der schwammartige Film ist porös mit einer gleichförmigen Lochgröße von ca. 20 nm (siehe Bild). Der Bildungsmechanismus ist noch unklar, wahrscheinlich tragen aber Kohlenstoff-Formen, die du…