Materials Literature
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The luminescence properties of hydrated Eu3+-exchanged zeolite A at 4.2 K are reported. The luminescence spectra indicate that the Eu3+ ions in the zeolite cages are, unlike Eu3+ ions in hydrated zeolite Y, bound to framework oxygens. High-resolution measurements suggest that Eu3+ ions are located in two sites in the…
The crystal and molecular structure of the polythiophene 4 and its charge-transfer complex with tetracyanoquinodimethane (TCNQ) have been determined. Crystal data: 4, C10H4S4, M= 252.38, monoclinic, P21/n, a= 11.462(1), b= 4.026(1), c= 10.437(1)Å, β= 103.77(1)°, V= 467.8(1)Å3, Z= 2, D= 1.792 g cm–3; 4·(TCNQ), C22H8N4S…
The crystal structures of tetranuclear butterfly clusters of CuI, AgI and the mixed metal AgI2CuI2 compound as obtained by reaction of the metal acetates with 2-mercaptothiazoline, and subsequent treatment of the insoluble polymeric clusters with organic bases are reported.
Purification of aldehyde oxidoreductase from C. thermoaceticum, the first detected enzyme able to reduce reversibly non-activated carboxylic acids to the corresponding aldehydes (White, H., Strobl, G., Feicht, R. & Simon, H. (1989) Eur. J. Biochem. 184, 89-96), results in the generation of multiple forms of the enzyme…
The microstructure of two commercial alloys MA956 and MA957 obtained by mechanical alloying has been investigated. These Oxide Dispersion Strengthened (ODS) ferritic materials display particular microstructures and behaviours under heat treatments. Recrystallization phenomena depends on a lot of material processing pa…
Abstraet-Supcrhydrophohic FEP-Teflon was prepared by argon ion etching followed by oxygen glow discharge treatment of commercially available FEP-Teflon sheet material. This combined treatment yielded an increase in water contact angle from 109° to > 140°. Ion etching alone caused a small increase in surface roughness…
An empirical potential-energy function comprising two- and three-body terms, whose parameters have been determined from the properties of solid silicon, is used to study the structures and energies of silicon microclusters. For small clusters, densely packed (non-diamond) structures are found which are in broad agreem…
Alumina-boria samples with B : (B + Al) 0–50 atom% have been prepared by an unconventional procedure consisting of the reductive decomposition of the mixture of nitrates in the presence of glycerol X-ray diffraction (XRD)-amorphous samples having surface areas of 380–470 m2 g–1 were obtained after calcination at 673 K…
Abstract The antioedematogenic activity of two natural pregnane compounds from Mandevilla velutina was evaluated against croton oil‐induced ear oedema in mice. For comparison the effects of nonsteroidal (indomethacin, phenidone and BW 755C) and steroidal (dexamethasone) antiinflammatory drugs were analysed. The purifi…
The authors present guidelines for analyzing harmonics and transient overvoltages generated by arc furnaces. Computer simulation techniques for creating accurate models for the analysis of arc furnace power systems are also discussed. Simulation guidelines are outlined in detail to assist the power systems engineer in…
Brillouin and neutron-scattering measurements of TA-phonon branches are reported for SrTiO 3 at small wave vectors and at temperatures well below the 105 K structural transition. Anomalous softening in the former measurements, and dispersion in the latter, are found in the quantum paraelectric regime. Furthermore, an…
Single-cell forward light scattering patterns have been examined for four algal species (one pennate diatom, two green flagellates and one filamentous cyanobacterium), mounted statically in a focused laser beam. In all cases, the distribution of light intensity at narrow angles (within the first scattering lobe) is we…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBonding properties of calcium gallium arsenide, Ca14GaAs11: a compound containing discrete GaAs4 tetrahedra and a hypervalent As3 polyatomic unitR. F. Gallup, C. Y. Fong, and Susan M. KauzlarichCite this: Inorg. Chem. 1992, 31, 1, 115–118Publication Date (Print):January 1, 1…
The radiation-induced conductivity (RIC) in polypropylene, polyethylene terephthalate, and polyimide due to electron-beam irradiation is measured with an external bias method and, in the case of polypropylene, also with a short-circuit method, as a function of dose rate and time of irradiation or total dose. The resul…
The field of molecular metals and superconductors has developed rapidly since the first molecular metal was discovered in the late 1960s. The most extensive range of compounds are based on planar organic donor molecules containing sulfur or selenium atoms and complex metal anions containing multi-sulfur ligands. This…
The leaching of water-soluble plasticizers from polymeric films prepared by casting and drying of plasticized colloidal polymer dispersions was investigated with respect to the type and concentration of plasticizer (triethyl citrate or triacetin), film thickness, type of colloidal polymer dispersions (acrylic: Eudragi…
The changes in the crystal structure of poly(3-alkylthiophene)s resulting from doping have been studied by X-ray diffraction measurements of electrochemically doped poly(3-alkylthiophene) films. The lattice parameter a, which corresponds to the distance between main chains along the side alkyl chain, increases upon do…
WO3 films have been electrodeposited in a solution containing dissolved tungsten and alcohol. The deposition conditions and the deposition efficiency on various substrates were studied. The properties of the electrodeposited WO3 film were characterised by electrochemical, surface analytical and in situ optical techniq…
Magnesium alloys with Gadolinium or Terbium, whose content 20mass% was near the maximum solid solubility, were melted by means of a fluxless method and their age hardening behavior, mechanical properties at elevated temperature and physical properties were investigated. Both alloys exhibit considerable age hardening a…
In resolutions based on the solubility difference between pairs of diastereoisomeric salts, the maximum efficiency (parameter S) can be calculated from a knowledge of the eutecic composition of the binary T–x diagram. We demonstrate that an approximate binary phase diagram can be determined from the DSC melting curve…