Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComposition dependence of the miscibility and phase structure of amorphous/crystalline polymer blends as studied by high-resolution solid-state carbon-13 NMR spectroscopyXiaoqing Zhang, K. Takegoshi, and Kunio HikichiCite this: Macromolecules 1992, 25, 9, 2336–2340Publicatio…
Collision-induced intramolecular energy transfer between N2 triplet states has been investigated for the first time under single-collision conditions. A beam containing N2 molecules in the long-lived N2(A 3Σ+u) and N2(W 3Δu) states interacted with target particles (H2, N2, NO, and all rare gases) either in a collision…
Two experiments known as Tl and T2 are performed in the test section TERMOS of the FARO facility. Quantities of the order of 100 kg of molten pure UO2 ∼3000°C are poured into 130 kg of sodium at 400°C and 0.1 MPa contained in a 0.28-m-diam test tube over a height of 2.5 m. The tests show a melt delivery rate twice as…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHexavanadium polyoxoalkoxide anion clusters: structures of the mixed-valence species (Me3NH)[VIV5VVO7(OH)3{CH3C(CH2O)3}3] and of the reduced complex Na2[VIV6O7{CH3CH2C(CH2O)3}4]M. Ishaque Khan, Qin Chen, Jon Zubieta, and David P. GoshornCite this: Inorg. Chem. 1992, 31, 9, 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordination polymers of tetracyanoethylene with metal hexafluoroacetylacetonates: formation and x-ray crystal structuresAndrew G. Bunn, Patrick J. Carroll, and Bradford B. WaylandCite this: Inorg. Chem. 1992, 31, 7, 1297–1299Publication Date (Print):April 1, 1992Publication…
The cesium and tetramethylammonium (TMA) salts of polyoxotungstate anions with covalently attached organosilyl groups of formula [(RSi)2O]SiW11O39(4-), where R = CH2CH2COCH3, (CH2)3CN, and CH==CH2 (1-R, cesium salt, unless otherwise noted) have been prepared, purified, and spectroscopically characterized. The water so…
Abstract Hydrotalcites of high aluminum content have been synthesized from aluminate liquors of varying composition and activated magnesia obtained by calcination of hydroxide or hydroxycarbonate precursors. Lattice parameter measurements and chemical analyses of 21 synthetic hydrotalcites show that the aluminum subst…
The baiB gene from Eubacterium sp. strain VPI 12708 was previously cloned, sequenced, and shown to be part of a large bile acid-inducible operon encoding polypeptides believed to be involved in bile acid 7 alpha-dehydroxylation. In the present study, the baiB gene was subcloned and expressed in Escherichia coli and sh…
Abstract Reaction of 2,5-dibromopyrimidine with a zero-valent nickel complex affords poly(pyrimidine-2,5-diyl). This new polymer is easily converted into electrical conducting materials by chemical and electrochemical reductions, the latter reduction occurring at the highest potential (−1.75 V vs. Ag/Ag+) among report…
The bipolymer calf thymus deoxyribonucleic acid (DNA) is employed to stabilize cadmium sulfide crystallites in the quantum confinement size regime (Q-CdS). In this work, the synthesis and characterization of these semiconductor 'quantum dots' is described. These Q-CdS clusters are easily prepared in aqueous solution a…
Strong O 1s and Cu 2p resonant enhancements are observed in the valence-band photoemission spectra of ${\mathrm{Bi}}_{2}$${\mathrm{Sr}}_{2}$${\mathrm{CaCu}}_{2}$${\mathrm{O}}_{8}$, CuO, and ${\mathrm{Cu}}_{2}$O. The results can be accounted for by a model Hamiltonian with similar parameters but different band filling.…
We report the genetic, clinical, electrophysiological, and imaging studies in a family with bilateral striopallidodentate calcinosis (Fahr's disease). The intracerebral calcium deposits occurred before onset of the symptoms in the third decade of life. Progressive neurological deterioration occurred in the fifth decad…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStabilization and characterization of pernigraniline salt: the "acid-doped" form of fully oxidized polyanilinesGiuseppe D'Aprano, Mario Leclerc, and Gianni ZottiCite this: Macromolecules 1992, 25, 8, 2145–2150Publication Date (Print):April 1, 1992Publication History Publishe…
Calcul des parametres ds liaisons de valence reliant les valences aux longueurs des liaisons dans une paire d'atomes, chaque atome etant l'un des elements suivants: H, B, C, Si, Ge, N, P, As, Sb, O, S, Se, Te, F, Cl, Br, and I. Suggestions d'utilisation des tables de donnees
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRod-to-coil transition in alkoxy-substituted polythiophenesClaudine Roux and Mario LeclercCite this: Macromolecules 1992, 25, 8, 2141–2144Publication Date (Print):April 1, 1992Publication History Published online1 May 2002Published inissue 1 April 1992https://pubs.acs.org/do…
Size fractions (2000–20 μm, 20–2 μm, 2–0.2 μm, and 0.2–0 μm) were obtained after Na-resin treatment of five top horizons from low-activity clay soils. Their specific surface areas (SSA) were measured by the N2-BET method. The same method was applied after organic matter removal by H2O2 treatment to two of the bulk soi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSuperoxide (O2-) on the surface of heat-treated ceria. Intermediates in the reversible oxygen to oxide transformationXiaolang Zhang and Kenneth J. KlabundeCite this: Inorg. Chem. 1992, 31, 9, 1706–1709Publication Date (Print):April 1, 1992Publication History Published online…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of strain on chemical reactivity. Relative reactivity of torsionally distorted double bonds in MCPBA epoxidationsKenneth J. Shea and Jang Seob KimCite this: J. Am. Chem. Soc. 1992, 114, 8, 3044–3051Publication Date (Print):April 1, 1992Publication History Published…
The principal pressure-induced changes in spectra observed are reversible, so that the characterization of the high density states of these materials requires in situ measurements at high pressure. The dominant change in all three glasses is a marked shift of the midfrequency Raman bands to higher frequencies at highe…
Abstract Parallel-oriented and exceptionally long (> 10 μ m) tubes of halloysite occur in the pallid zone of a deeply-weathered lateritic profile on granite in southwest Australia. Transmission electron microscopy and selected-area electron diffraction of ultrathin sections showed that kaolinite plates within pseud…