Materials Literature
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Hybrids of epoxy resin and silica cured respectively with methyl nadic anhydride (MNA) and 4,4′-diaminodiphenyl sulfone (DDS) were prepared. Control of the morphology was achieved through functionalisation of a diglycidyl ether resin respectively with monofunctional and difunctional secondary amine trialkoxysilanes pr…
The photo-oxidation reactions of several meso-tetraphenylporphyrins have been studied in order to ascertain the chemical stability of this class of compounds towards singlet oxygen. The 2,6-disubstituted ones showed an excellent stability, whilst this is not the case for other porphyrins with different substitution pa…
1. INTRODUCTION Dispersions of inorganic fillers within polymers are commonly designated as polymer-based composites. The properties of these materials are isotropic or anisotropic, depending on the geometry of the filler particles and the effect of the processing conditions on their orientation. Fillers are used to i…
The crystal structures of four compounds from a family of commonly used molecular building blocks of nonlinear optical materials, aminonitropyridines, have been determined. The structures of 2-amino-5-nitropyridine 1, 2-amino-5-nitropyridine monohydrate 2, and of two new polymorphs of 2-amino-3-nitropyridine 3,4, are…
Selective growth behavior of {110} <001> grains has been studied utilizing the temperature gradient annealing method. As grains grow, the average deviation angle from the ideal {110} <001> orientation becomes smaller and orientation distribution changes corresponding to that of coincidence grains in the matrix. Second…
The quantitative determination of Gd-containing magnetic resonance imaging (MRI) contrast agents in animal tissues is performed by both ICP-AES and ICP-MS. While ICP-AES has been used to determine Gd-containing contrast agents by other workers, no published methodology has been found. An accurate and precise method us…
A solution to the phase problem of electron diffraction is described which allows an aberration-free atomic resolution image of Si〈110〉, showing the expected dumbbell contrast, to be reconstructed at a resolution of 3 times the point resolution and 2.5 times the information limit of the scanning transmission electron…
In order to determine whether or not oxidation of polymer influences water treeing, more than 200 vented and bow-tie trees from 31 field-aged cables were investigated. Micro-IR spectroscopy analysis has not shown any consistent excess of carbonyl content in water trees as compared with the adjacent non-treed regions o…
Previously synthesized lactic/glycolic acid (PLGA) oligomers with different compositions (i.e. different ratio of lactic to glycolic acid in the oligomers) were further studied regarding their biodegradation and drug delivery application. The PLGA oligomers have fast biodegradation characteristics. They degrade to wat…
The recently proposed strategy for studying the equilibrium thermodynamics of the glass phase using a molecular liquid is reviewed and tested in details on the solvable case of the p-spin model. We derive the general phase diagram, and confirm the validity of this procedure. We point out the efficacy of a system of tw…
Abstract This paper shows for the first time that when a monomer is to be grafted onto a polymer backbone by a free radical mechanism in a twin screw extruder, the grafting process occurs mainly, if not exclusively, in the plastification (melting) zone. For this purpose, the free radical grafting of glycidyl methacryl…
Description This publication will advance the knowledge of those simple, yet complicated, devices known as anti-friction bearings, be they ball, roller, or needle. 33 peer-reviewed papers present the work of researchers from Austria, Belgium, China, France, Germany, Greece, Japan, Netherlands, Russia, Sweden, UK, and…
α-Mn2O3 (containing a minor proportion of Mn5O8) was obtained by calcination of pure MnO2 at 700°C for 2 h. It was alkalized by impregnation of the parent dioxide with potassium and barium nitrate solutions prior to the calcination. K-Mn2O3 (α-Mn2O3+KMn8O16) and Ba-Mn2O3 (α-Mn2O3) thus respectively produced were subje…
Reaction of 8,12-diethyl-2,3,7,13,17,18-hexamethylcorrole (1) with POCl3 in pyridine affords the first non-metal derivative of corrole; in this compound, 2, the phosphorus is in a pentavalent state and is different from analogous complexes of porphyrins.
In the novel double salt Ag2C2·2AgClO4·2H2O, the C22– dianion [bond length 1.217(7) Å] is encapsulated inside an octahedral Ag6 cage, and the resulting cationic [C2@Ag6] units share corners to generate metallic layers between which the perchlorate anions and aqua ligands are accommodated.
Visualization of structural details of specimens in field emission scanning electron microscopy (FE-SEM) requires optimal conductivity. This paper reports on the differences in conductive layers of Au/Pd, Pt and Cr, with a thickness of 1.5–3.0 nm, deposited by planar magnetron sputtering devices. The coating units wer…
We present complex admittance measurements on single-crystal yttria-stabilized zirconia and polycrystalline ${\mathrm{Li}}_{0.5}{\mathrm{La}}_{0.5}{\mathrm{TiO}}_{3}$ over the frequency range 5 Hz to 30 MHz and at temperatures ranging between 150 and 650 K. Electric-field relaxation in both fast ionic conductors can b…
Perovskite powders of La0.3Sr0.7CoO3–δwere prepared by the thermal decomposition of precursor complexes derived from nitrate solutions using ethylenediaminetetraacetic acid (EDTA) as a complexing agent. The calcination temperature is 920 °C. Powders thus obtained have a low carbon contamination. Dense ceramics with a…
Magnetic and structural properties of sintered NdFeB magnets with addition of various amounts of DyGa as a separate powder are studied and compared with single-powder magnets of the same nominal composition. When the magnets are annealed above 640 °C, the coercivity decreases strongly as compared to magnets annealed b…
Nanosize particles of SrFe12O19 have been synthesized by a citrate precursor technique with various Fe/Sr ratios of 12.0 to 9.0. X-ray diffraction (XRD) studies showed the formation of ultrafine, monophasic SrFe12O19 particles with comparable unit cell parameters. Magnetic clusters were observed by scanning electron m…