Materials Literature
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Cryogenic liquids are claimed to have an impact on the concept of improved future power equipment. The low boiling temperature of liquid helium or liquid nitrogen offers the use of superconducting materials which eliminate ohmic losses in the conductors. This yields a high overall current density in the equipment. The…
The oxidation rate of high-purity Cu has been measured by means of thermogravimetry in oxygen in the pressure range to 1 atm and water vapor in the pressure range to 0.022 atm at 500°C, respectively, and as a function of temperature under wet (0.022 atm and dry conditions from 400 to 1000°C. The oxidation is parabolic…
The reaction of Eu(NO3)3·6H2O with amide type tripodal ligand L produces an unexpected three-dimensional network, which is directed by both coordinate and hydrogen bonds.
The novel spherical cluster-compound K2Na6[K20 [symbol: see text] Mo80-V22O282(SO4)12(H2O)66]. approximately 140H2O 1 has been obtained in a 'one-pot' reaction and exhibits several remarkable structural features: 30 open shell centers, i.e. 8 Mov and 22 VIV spanning an icosidodecahedron, the incorporation of 20 K+ cat…
Solid solutions of the form Ba(Ce1 − xBix)O3 (x = 0.0–0.5) have been prepared by a modified Pechini method at 800 °C in air. XRD results indicate that all the samples have orthorhombic symmetry. Ba(Ce1 − xBix)O3 shows no reaction with Ce0.9Gd0.1O2, even when sintered at 1100 °C, but totally decomposes when mixed with…
We discuss different methods to grow organic single crystalline thin films from solution. Specifically, we address exploratory developments and apply them on the highly nonlinear material DAST (4′-dimethylamino-N-methyl-4-stilbazolium tosylate) in a DAST/methanol system. We describe the nucleation and growth thermodyn…
A novel process employing solid electrolyte-based ion-transport membranes enables the production of high-purity oxygen at elevated pressure from a feed stream of ambient pressure air. This technology exploits the theoretically infinite selectivity of oxygen ion migration through a dense ceramic electrolyte membrane un…
SUMMARIES Paper is a composite material, which makes interpretation of experiments extremely difficult. Nevertheless, the data obtained so far on a limited amount of samples support the theory that higher pH values may have a negative effect on the stability of paper made from bleached chemical pulps. Higher pH accomp…
We construct complete bounded minimal surfaces in ℝ<sup>3</sup> with arbitrary topological genus.
The densification kinetics and mechanism of a low‐temperature cofirable borosilicate glass (BSG) + alumina during the constrained sintering of a sandwich structure of alumina/(BSG + alumina)/alumina has been studied. The densification kinetics becomes slower when the BSG + alumina tape is constrained during firing. Ho…
No abstract prepared.
We propose a solid oxide fuel cell design based on a configuration of two electrodes on the same surface of the electrolyte in a flowing mixture of different hydrocarbons and air between 500 and 600°C. The ohmic resistance can be reduced without using a thin electrolyte film due to a significantly enhanced performance…
Modified tripyrranes incorporating furan and thiophene rings were found to condense with benzene, pyridine and indene dialdehydes to give a series of novel porphyrin analogues, including thia- and oxa-carbaporphyrins; the latter readily forms nickel(II) and palladium(II) organometallic complexes.
Ultrafine-grained structure formed dynamically through severe plastic deformation at elevated temperatures has been investigated in a 0.1% C-0.4% Si-1.5% Mn steel. The effects of the strain, the strain rate and the deformation temperature on the microstructural evolution were examined using a compression technique wit…
Abstract In this work, we report on our last results concerning the polyethyleneterephtalate barrier performance optimization as a function of the chemistry of the SiOx coating, deposited by means of hexamethyldisiloxane/oxygen-fed plasmas ignited in an RF capacitively coupled parallel plates reactor. The influence of…
The fabrication of macropores in crystalline silicon by photoelectrochemical etching in a hydrofluoric acid electrolyte is investigated. It is shown that the dimensional constraints on the pore diameters, which, in previous literature, are considered to depend on substrate doping, can be significantly relaxed. We show…
Nano-scale structures of rusts formed on the weathering steel surface were investigated. It has been shown that the key structure is an Fe(O, OH)6 network, which is different from crystalline FeOOH. Atomic structures were analyzed quantitatively by a combination of X-ray absorption fine structure (XAFS) analysis inclu…
Evidence for plastic deformation of crystalline metal thin films without involving dislocations is presented. Direct observation of the films during deformation under an electron microscope confirmed the absence of dislocations even for heavy deformation. In fcc metals, including aluminum, deformation leads to the for…
Photoluminescence (PL) and selective photoluminescence (SPL) experiments have been carried out to analyse the neutral donor bound exciton spectra of nominally undoped wurtzite ZnO epilayers and to study the electronic levels introduced by arsenic doping. The investigated samples were grown by molecular beam epitaxy on…
Two novel soluble polymer-bound oligo-l-leucines 2 and 5, which can be retained by a membrane reactor system, have been prepared and used as catalysts for the continuously operated asymmetric epoxidation of chalcone. The optimized batch reaction conditions yield epoxychalcone in high enantioselectivities (up to 94%) a…