Materials Literature
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Replacement of divalent Sr 2 + ions by monovalent K + ions in La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 2.85 ( LSGM ) decreases the electrical conductivity of LSGM and increases the activation energy to 1.42 eV. Substitution of La by substantial amounts of up to 50 atom % of Pr in LSGM yields new mixed oxide ion and electronic co…
The processing response of a 70% silicon nitride–30% barium aluminum silicate (70%‐Si 3 N 4 –30%‐BAS) ceramic‐matrix composite was studied using pressureless sintering, at temperatures ranging from 1740°C, which is below the melting point of BAS, to 1950°C. The relationship between the processing parameters and the mi…
Barium ferrite (BaFe12O19), lithium ferrite (Li0.5Fe2.5O4) and magnesium zinc ferrite (Mg0.5Zn0.5Fe2O4) have been prepared by self-propagating high-temperature synthesis (SHS) reactions from iron, iron(III) oxide and metal oxides and peroxides. The driving force for the reactions is the oxidation of iron powder. React…
The modeling of magnetic components for use in electrical circuit simulation requires that the core material be accurately characterized. This paper investigates a method of extracting parameters to model the hysteresis behavior of magnetic core materials and optimizing them to achieve accurate results during circuit…
The syntheses of three new salen ligands that are tethered to a p-acylthio(phenylacetylene)n linker are described. The two key steps in the syntheses are coupling of the p-acylthio(phenylacetylene)n linker (n = 0–2) with a 5-iodosalicylaldehyde and the subsequent condensation of the aldehyde moiety of the formed adduc…
Two novel chiral (bola)amphiphilic oligo(p-phenylenevinylene)s (OPVs) have been synthesised and fully characterised. Decoration of the hydrophobic OPV backbone with a hydrophilic tris[tetra(ethylene oxide)]benzene wedge on one side and a hydrophobic tris(alkoxy)benzene wedge on the other side, resulted in amphiphilic…
The interaction of the noble metals Pd and Pt with the {111} and {011} surfaces of cubic-ZrO2 was examined by employing pseudo-potential plane-wave calculations within two Hamiltonians: the LDA and Perdew–Wang91 (GGA). The most favourable adsorption sites, adsorption energies, density of states and electron-charge den…
We create polymer liquid crystals (PLCs) on a computer and subject them to constant-force tensile deformations. Molecular dynamics simulation procedure is used and graphical models and animations of crack formation and propagation as a function of time are generated. Special attention is given to realistic rigid LC is…
Contact-angle measurements, atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS or ESCA) were used to characterize flame-treated biaxially oriented polypropylene (PP) films. While the surface of PP treated in a fuel-lean flame is highly oxidized, no watersoluble low-molecular-weight oxidized mater…
The appearance of self-organized structures on elastomer surfaces owing to the combined treatment of ionizing radiation and mechanical strain is described. For example, ion bombardment of stretched elastomer surfaces after subsequent relaxation of the polymer results in a self-organized, undulating surface topology, w…
A cerium dioxide (CeO2) film with characteristic cubic lattice and optical band gap energy has been deposited chemically onto a non-conductive glass substrate at 333 K by simple immersion into an aqueous solution containing hydrous cerium(III) nitrate and dimethylamineborane (DMAB).
A new series of sodium/potassium salts of sandwich-type [Mn+3(H2O)x(BiW9O33)2](18 − 3n)− heteropolyanions (Mn+ = (VO)II, x = 0 (1) and Mn+ = CrIII (2), MnII (3), FeIII (4), CoII (5), NiII (6), CuII (7), x = 3) were synthesized and characterized by means of elemental analyses, thermogravimetry, FT-IR, UV-VIS, EPR and H…
This volume reviews the metal and ammonium formate solubility data published up to 1995. So far as the editors are aware, all the solubility data published during this period have been reviewed. Preference has been given to data published in numerical form. Data that appeared only in graphical form may not appear in t…
The influence of different hosts, processing conditions and conducting fillers on the percolation threshold (Φc) of the resulting conducting blends was investigated. Results indicate that microscopic properties, such as the dipole moments of the side-groups, and distribution of these groups on the host polymer backbon…
Ligand exchange reactions of chloride ligands on a trinuclear palladium acetylide core with platinum acetylide dendrons having a 4-pyridyl group at a focal point result in the quantitative formation of novel organometallic dendrimers, which easily revert to the core and the dendrons by treatment with Bu4NCl.
The incorporation of up to 40 % lead excess into the perovskite lattice of Pb(Zr,Ti)O3 (PZT) has been investigated. Three independent chemical composition analysis methods confirmed the correct determination of the lead excess, present as Pb2O3. High resolution TEM excludes any second phases and restricts the occurren…
All articles of this category 2,3-Dibromobenzofuran ( 1 ) and 2,3,5-tribromobenzofuran ( 2 ) undergo regioselective Sonogashira- and Negishi-type cross-coupling reactions at the 2-position. Subsequent substitution reactions at C-3 are possible for the cross-coupling products obtained from compound 1 . A regioselective…
Conventional loading of induction motors is an extremely difficult and expensive process for large machines. In those cases, full load losses and temperature rise can be estimated by means of equivalent loading methods, which provide an accurate alternative, without the need of a mechanical load applied to the shaft.…
Mesoporous aluminosilica molecular sieves AlMCM-41 are loaded with different amounts of Ag+, Pd2+ and Pt2+ ions by varying the Si/Al ratio, which changes the ion exchange capacity. These metal ions are reduced to metal particles by hydrogen and characterized by conduction electron paramagnetic resonance (CEPR). Metal…
The present paper first shows that the scalar stop hysteron model has the property of equal vertical chords for back-and-forth input variations of the same amplitude. This property leads to an identification method of the scalar model. Secondly, identification methods are developed for the 3-D and 2-D isotropic vector…