Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of acetylene and olefin insertion into palladium-carbon .sigma. bondsEdward G. Samsel and Jack R. NortonCite this: J. Am. Chem. Soc. 1984, 106, 19, 5505–5512Publication Date (Print):September 1, 1984Publication History Published online1 May 2002Published inissue 1…
Abstract Results of a preliminary study of the surface of wood exposed to outdoor weathering as well as to UV irradiation showed that ESCA provides valuable information and insight into the manifestation of weathering and photooxidation. From the ESCA spectra, the increase in signal intensities of carbon–oxygen bonds…
Subsolidus phase relations in the low‐Y 2 O 3 portion of the system ZrO 2‐ Y 2 O 3 were studied using DTA with fired samples and X‐ray phase identification and lattice parameter techniques with quenched samples. Approximately 1.5% Y 2 O 3 is soluble in monoclinic ZrO 2 , a two‐phase monoclinic solid solution plus cubi…
Abstract The yields of C 5 and C 6 alkyl nitrates from neopentane, 2‐methylbutane, 2‐methylpentane, 3‐methylpentane, and cyclohexane have been measured in irradiated CH 3 ONONO‐alkane‐air mixtures at 298 ± 2 K and 735‐torr total pressure. Additionally, OH radical rate constants for neopentyl nitrate, 3‐nitro‐2‐methylb…
Abstract Dypingite, Mg 5 (CO 3 ) 4 (OH) 2 ·5H 2 O, was found in materials obtained during the production of high purity magnesia from crude magnesite by the calcination/CO 2 -leaching process. The snow-white, finely crystalline dypingite contained 41.0% MgO; the theoretical value is 41.5%. The X-ray powder data reveal…
Polyfuran films are prepared electrochemically and found to exhibit electrical and optical properties similar to those of polythiophene and polypyrrole, though the electrical conductivity in a doped state is little lower than the latter two polymers. The resistivity of polyfuran is found to be very sensitive to humidi…
Abstract The general approach to the problem of the real structure of smectites requires an analysis based on the relationship between structural characteristics and diffraction patterns. This paper, which considers only the models corresponding to dioctahedral smectites saturated by K-cations and collapsed, includes:…
The novel ester (E)-phytol (5Z,8Z,11Z,14Z,17Z)-eicosapentaenoate++ + (1); (6Z,9Z,12Z,15Z)-hexadecatetraenoic acid; (6Z,9Z,12Z,15Z)-octadecatetraenoic acid; and (6Z,9Z,12Z)-hexadecatrienoic acid isolated from the diatom Navicula delognei f. elliptica, show significant antibacterial activity against Staphylococcus aureu…
A dual‐porosity, agglomerate‐type model for the porous anode and cathode of the molten carbonate fuel cell is developed and used to predict electrode performance in a small, differential‐conversion, cell. The model is based on a phenomenological treatment of mass transport, electrode kinetics, and ionic conduction, co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNature of iron(I) and iron(0) tetraphenylporphyrin complexes. Synthesis and molecular structure of (dibenzo-18-crown-6)bis(tetrahydrofuran)sodium (meso-tetraphenylporphinato)ferrate and bis[tris(tetrahydrofuran)sodium] (meso-tetraphenylporphinato)ferrateToshio Mashiko, Chris…
Abstract Fifty-three samples from the Oxford, Kimmeridge and Speeton Clays of the Yorkshire area have been analysed petrographically and geochemically, by X-ray diffraction, X-ray fluorescence, atomic absorption and combustion (TOC). Major elements and the following trace elements have been determined: Rb, Sr, Ba, Cr,…
The crystallization mechanism in a modified Li 2 O‐Al 2 O 3 ‐SiO 2 glass containing P 2 O 5 nucleating agent was investigated by transmission electron microscopy, X‐ray diffraction, and differential thermal analysis. During an initial 1000°C treatment P 2 0 5 and Li 2 O react to precipitate Li 3 PO 4 crystallites. At…
Alumina powders containing controlled amounts of hard aggregates exhibit isothermal shrinkage rates which decrease markedly with increasing aggregate content. Sintered densities achieved after 1‐ and 24‐h anneals decreased linearly with aggregate content. The microstructures of regions near aggregates and within aggre…
Enthalpies of solution of framework aluminosilicate glasses x M l/ n n + AlO 2 ‐(1‐ x )SiO 2 (M = Cs, Rb, K, Na, Li, Ba, Pb, Sr, Ca, Mg) in molten 2PbO.B 2 O 3 near 973 K were measured. The sequence above represents increasing ability of the nonframework cation M to bond to the bridging oxygen. In that sequence, the e…
The iron loss improvement which produces the highest grade of non-oriented Si steel is described on the basis of studies which clarify the effects of Si content, grain diameter, impurities and crystalline texture on the iron loss. Impurities were found to increase iron loss directly through magnetic domains and indire…
Optical-absorption and emission spectra are presented for ${\mathrm{Ho}}^{3+}$ ions in fluorozirconate (ZBLA) glass [the nominal composition of ZBLA glass (in mol%) is 57, ${\mathrm{ZrF}}_{4}$; 34, ${\mathrm{BaF}}_{2}$; 5, ${\mathrm{LaF}}_{3}$; and 4, ${\mathrm{AlF}}_{3}$]. The measured oscillator strengths and radiat…
Abstract Double-cation hydroxy compounds, generally with the pyroaurite-type structure, were synthesized by a reaction involving the hydrolysis of a cation in solution by a fully hydrolysed and precipitated hydroxide of a second metallic cation. Synthesis of this type of compound is not limited to reactions between di…
Bovine pericardial tissue and tissue-derived bioprosthesis fixed in glutaraldehyde and stored in either glutaraldehyde or formaldehyde can induce cytotoxic reactions even after prolonged washing due to the slow leaching of the chemicals used for crosslinking and sterilizing. Sequential rinsing for up to 60 min was sti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFine-branching structure in high-pressure, low-density polyethylenes by 50.10-MHz carbon-13 NMR analysisTakao Usami and Shigeru TakayamaCite this: Macromolecules 1984, 17, 9, 1756–1761Publication Date (Print):September 1, 1984Publication History Published online1 May 2002Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the role of intermolecular hydrogen bonding in miscible polymer blendsE. J. Moskala, S. E. Howe, Paul C. Painter, and Michael M. ColemanCite this: Macromolecules 1984, 17, 9, 1671–1678Publication Date (Print):September 1, 1984Publication History Published online1 May 2002…