Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMembrane-spanning steroidal metalloporphyrins as site-selective catalysts in synthetic vesiclesJohn T. Groves and Ronny NeumannCite this: J. Am. Chem. Soc. 1987, 109, 16, 5045–5047Publication Date (Print):August 1, 1987Publication History Published online1 May 2002Published…
Abstract A preliminary report is given on the gas transport characteristics of a thermotropic liquid‐crys talline copolyester that is fully aromatic. At 35°C the permeability coefficients for He, H 2 , O 2 , Ar, N 2 , and CO 2 in this polymer are comparable to or smaller than those for polyacrylonitrile, which is one…
Abstract Cobalt(II) hydroxide–(sodium fluoride tetrasilicic mica) intercalation complexes were prepared by titrating cobalt(II) nitrate solutions in the presence of mica with sodium hydroxide under oxygen-free conditions. These complexes were characterized by chemical analysis, XRD, DTA-TGA, IR, and surface area measu…
Continuum diffusion of a third species in a two-phase system comprised of stationary globules, randomly distributed in a uniform background medium, is considered. The diffusing species can dissolve in either phase, with different solubilities and diffusion constants. A density expansion of the average diffusion coeffi…
Gallium is a metal that literally melts in your hand. It has low toxicity, near-zero vapor pressure, and a viscosity similar to water. Despite possessing a surface tension larger than any other liquid (near room temperature), gallium can form nonspherical ...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVibrational studies of interstitial carbide atoms in nickel and rhenium carbonyl carbide clustersP. L. Stanghellini, R. Rossetti, G. D'Alfonso, and G. LongoniCite this: Inorg. Chem. 1987, 26, 17, 2769–2774Publication Date (Print):August 1, 1987Publication History Published o…
A method is described of synthesizing a real-space distribution of scattering points which will give rise to virtually any required diffraction pattern. The distribution may be used in the form of an optical diffraction screen to give an immediate visual check on both the real-space and reciprocal-space distributions.…
The occurrence of discharges in an insulation system consisting of lapped uniaxially oriented polyethylene tapes impregnated with dodecylbenzene oil and the behavior of air bubbles injected into the structure have been investigated. This insulation system should be suitable for use in power transmission cables because…
Abstract Die Kristallstruktur von La 2 TeO 6 , orthorhombisch, a = 551,0, b = 944,1 und c = 1038,7 pm, und kristallographische Daten der mit gleicher Struktur kristallisierenden, bisher als hexagonal beschriebenen Lanthanoidtellurate (bis Yb 2 TeO 6 einschließlich) wurden ermittelt. Die Na 2 SiF 6 ‐Struktur für eine z…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVariable stereochemistry of the eight-coordinate tetrakis(oxalato)niobate(IV), Nb(C2O4)44-F. A. Cotton, Michael P. Diebold, and W. J. RothCite this: Inorg. Chem. 1987, 26, 17, 2889–2893Publication Date (Print):August 1, 1987Publication History Published online1 May 2002Publi…
The dipole-dipole network model of the porphyrin macrocyclic ring current is used to investigate the ring currents in reduced (hydro)porphyrins derived from phylloerythrin methyl ester. Reduction of ring D to afford the corresponding chlorin results in a decrease of the inner loop and pyrrole subunit ring currents by…
Pre-breakdown currents in polyimide (PI) films were measured under the application of dc ramp voltage (30 V/s) and the breakdown mechanism is discussed on the basis of the results. A steep current increase was observed from about 10-3 before the breakdown and was ascribed to a thermal runway which results in a filamen…
Fission product release from fully irradiated light water reactor fuel under accident conditions and the chemical forms and behavior of the released material have been studied at high temperatures. This work has emphasized release from commercial fuels, but tracer-level tests using specific fission product species hav…
I. THE SOFT MODE CONCEPT: In the late fifties ferroelectric research underwent a serious transition. Until that time the theory of ferroelectricity has been either phenomenological or consisted of attempts to develop microscopic theories for specific atomic structures. In 1959 Cochran1 pointed out that at second order…
Fine‐grained polycrystalline zirconia fibers have been formed from an acetate precursor. The fibers contained a Y 2 O 3 additive, which inhibited grain growth (grain size ≤0.5 μm) and allowed the tetragonal phase to be retained at room temperature. Fibers with diameters in the range 2 to 5 μm had strengths in the rang…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymerization of monomers containing functional silyl groups. 4. Anionic polymerization of 2-(trimethoxysilyl)-1,3-butadieneKatsuhiko Takenaka, Akira Hirao, Takashi Hattori, and Seiichi NakahamaCite this: Macromolecules 1987, 20, 8, 2034–2035Publication Date (Print):August…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBenzothiet-2-ones: synthesis, reactions, and comparison with benzoxet-2-ones and benzazetin-2-onesCurt Wentrup, Harald Bender, and Gerhard GrossCite this: J. Org. Chem. 1987, 52, 17, 3838–3847Publication Date (Print):August 1, 1987Publication History Published online1 May 20…
This paper describes a research programme at the Austrian School of Mines (Montanuniversität) at Leoben, carried out since 1981 in cooperation with the Max-Planck-Institute for metals research in Stuttgart, on the fundamentals of alloy design for high speed tool steels. Among the results, the development of niobium-al…
▪ Abstract The phase-field method has recently emerged as a powerful computational approach to modeling and predicting mesoscale morphological and microstructure evolution in materials. It describes a microstructure using a set of conserved and ...Read More
Abstract The thermal decomposition of pyruvic acid into carbon dioxide and acetaldehyde is a unimolecular first‐order reaction and takes place according to the rate equation, log k = 13.53–41,250/4.575 K. These parameters contrast markedly with those recently reported, viz. log k = 7.19–27,700/4.575 K and confirm that…