Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of a mixed-valence gold(I)/gold(III) complex, [Au(CH2)2PPh2]2Br2, and its characterization by x-ray crystallography and x-ray photoelectron spectroscopyRaphael G. Raptis, Leigh C. Porter, R. J. Emrich, H. H. Murray, and J. P. Fackler Jr.Cite this: Inorg. Chem. 1990…
A novel process using polyaniline for plating through hole technology has been developed. Polyaniline was dip-coated onto printed circuit boards and in turn acted as a thin conducting electrode for the electrolytic metallization of Cu on the through holes. This eliminates the necessity for expensive precious metal see…
Dense, fine‐grained silicon carbide (SiC) ceramics were fabricated by a hot‐pressing technique using pyrolyzed polycarbosilane powders. Hot‐isostatic pressing treatments were also applied to some of these hot‐pressed samples. The grainsize range of the obtained sintered bodies was from 0.2 to 1.4 μm, which was much fi…
Cationic cyclopolymerization, polymerization and/or cyclocopolymerization of 1,2-bis(2-ethenyloxyethoxy)benzene (DVE), 11- [(4′-cyano-4-biphenyl)oxy]undecanyl vinylether (CVE), and 3 - [2 - (1,2,2- trifluoroethoxy - 2 - (4- methoxy - 4′- (α - methylstilbene)oxy)) - 1 - (trifluorometh - yl)trifluoroethoxy] - 1 - [2-(et…
Soluble organic matrix isolated from dorsal carapaces of the blue crab, Callinectes sapidus, inhibited CaCO3 crystallization when free in solution. Immobilized matrix complexes, prepared by crosslinking soluble matrix to decalcified crab carapace, promoted CaCO3 formation in that crystallization in the presence of the…
Localization lengths of electronic states on one-dimensional Fibonacci quasicrystals are calculated exactly within a decimation-renormalization scheme. A self-similar pattern is obtained for the localization lengths along the spectrum as the numerical resolution is improved. Properties of the states in the spectrum ar…
Abstract Consequences for classification, structure and properties are assessed in the simplest case of an uncrystallizable chemically unspecific polymer, atactic polystyrene (a‐PS), for these studies, in closely monodisperse form. The mechanism first proposed by Berghmans and collaborators, namely liquid‐liquid phase…
Fatigue crack propagation rates in tension‐tension load cycling were measured in ZrO 2 ‐12 mol% CeO 2 ‐10 wt% Al 2 O 3 ceramics using precracked and annealed compact tension specimens. The fatigue crack growth behavior was examined for Ce‐TZPs of different transformation yield stresses obtained by sintering for 2 h at…
A ceramic, Joule‐heated, slurry‐fed melter will be used to vitrify Savannah River Site high‐level waste at the Defense Waste Processing Facility (DWPF) in Aiken, SC. The entire vitrification process must be performed remotely and the borosilicate host glass must accommodate a variety of waste compositions. The control…
SiO2-passivation layers formed by thermal oxidation and various chemical vapor deposition (CVD) processes have been investigated by infrared spectroscopy and wet chemical etching studies in ammonium hydroxide water solutions. In order to obtain effects of thermal annealing on the dislocation structure of deposited oxi…
Off-axis tension tests were performed on SCS-6/Ti-6-4 metal matrix com posite. A one-parameter plasticity model was used to characterize the elastic-plastic prop erties. In addition, a micromechanical model was developed assuming elastic fiber and elastic-plastic matrix properties. This model was employed to relate th…
SUMMARY The X‐ray microanalytical spatial resolution is determined experimentally in various analytical electron microscopes by measuring the degradation of an atomically discrete composition profile across an interphase interface in a thin‐foil of Ni‐Cr‐Fe. The experimental spatial resolutions are then compared with…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRemote oxidation of unactivated carbon-hydrogen bonds in steroids via oxometalloporphinatesPaul A. Grieco and Timothy L. StukCite this: J. Am. Chem. Soc. 1990, 112, 21, 7799–7801Publication Date (Print):October 1, 1990Publication History Published online1 May 2002Published i…
A technique was developed to estimate the R ‐curve behavior of Y‐TZP using indentation‐produced flaws. This technique allows crack‐growth resistance to be determined for short crack extensions (micrometers). For Y‐TZP samples sintered at 1600°C for 1 h (mean grain size, 0.7 μm), the crackgrowth resistance increases ra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanistic studies of olefin epoxidation by a manganese porphyrin and hypochlorite: an alternative explanation of saturation kineticsJames P. Collman, John I. Brauman, Philip D. Hampton, Hiroo Tanaka, D. Scott Bohle, and Robert T. HembreCite this: J. Am. Chem. Soc. 1990, 11…
Graphite-alkaline metal systems (lithium, potassium, rubidium, cesium) have been investigated under high-pressure conditions. New graphite intercalation compounds of C4M composition with alkali metal contents twice as high as in those obtained with traditional methods without applying high pressure have been produced.…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction of cyclohexene with iodosylbenzene catalyzed by non-porphyrin complexes of iron(III) and aluminum(III). Newly discovered products and a new mechanistic proposalYihui Yang, Francois Diederich, and Joan Selverstone ValentineCite this: J. Am. Chem. Soc. 1990, 112, 21,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluorine-containing photoreactive polyimide. 6. Synthesis and properties of a novel photoreactive polyimide based on photo-induced acidolysis and the kinetics for its acidolysisToshihiko Omote, Ken'ichi Koseki, and Tsuguo YamaokaCite this: Macromolecules 1990, 23, 22, 4788–4…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA photoelectron-photoion coincidence study of iron pentacarbonylK. Norwood, A. Ali, G. D. Flesch, and C. Y. NgCite this: J. Am. Chem. Soc. 1990, 112, 21, 7502–7508Publication Date (Print):October 1, 1990Publication History Published online1 May 2002Published inissue 1 Octobe…