Materials Literature
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Phase transformations in Ti–50V alloys containing oxygen in the range <0·095–0·36 wt-% have been studied at 750 and 400°C for times up to 1000 h. Results of electron microscopy, X-ray diffraction, and hardness testing indicate that oxygen widens the α+β phase field at 750°C and the metastable β phase miscibility gap a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCopper atomization mechanisms in graphite furnace atomizersPingxin. Wang, Vahid. Majidi, and James A. HolcombeCite this: Anal. Chem. 1989, 61, 23, 2652–2658Publication Date (Print):December 1, 1989Publication History Published online1 May 2002Published inissue 1 December 198…
Al 2 TiO 5 materials were sintered under different conditions to produce different grain sizes. The resultant microcracked materials exhibited a range of bulk thermal expansions which showed a strong correlation with average grain size. An Al 2 TiO 5 average grain size of 3 to 4 μm was the minimum at which the size an…
Aus Furfurylalkohol auf einfachem Wege konnte das überfällige Schwefel‐Analogon des Porphyrins, das Tetrathiaporphyrin‐Dikation 1 , als Perchlorat gewonnen werden. Den Schlüssel zur Synthese bildet der bemerkenswert glatt erfolgende O/S‐Austausch im Tetraoxaporphyrinogen. Das Ringgerüst von 1 ist nicht mehr planar. ma…
Calculations are performed on a series of p-substituted aniline for which corrosion activities have been reported, using semi-empirical molecular orbital method. Approximate ground-state electronic properties are obtained for each molecule studied. Significant correlations are obtained between corrosion rate and corro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA cyclic octanuclear polyoxoalkoxy vanadate(IV) with an oxalate-binding cavity, [(n-C4H9)4N]2[V8O8(OCH3)16(C2O4)]. Structural comparison with the analogous polymolybdates(V) complex [(n-C4H9)4N]2[Mo8O16(OC2H5)8(C2O4)]Qin Chen, Shuncheng Liu, and Jon ZubietaCite this: Inorg.…
The application of X-ray absorption spectroscopy (XAS) to the study of diffusion properties of oxide glasses and glass surfaces is considered. Mixed alkali silicates, the chemical resistance of iron-lead-phosphate glasses and the surface structure of uranium in leached borosilicate glasses are discussed. Results are i…
Equilibrium binding studies demonstrate that purified Escherichia coli isocitrate dehydrogenase binds isocitrate, alpha-ketoglutarate, NADP, and NADPH at 1:1 ratios of substrate to enzyme monomer. The phosphorylated enzyme, which is completely inactive, is unable to bind isocitrate but retains the ability to bind NADP…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT1,2,3,5-Diselenadiazolyls as building blocks for molecular metals. Preparation and structures of [PhCN2Se2]+PF6- and [PhCN2Se2]2Paul Del Bel Belluz, A. Wallace Cordes, Eva M. Kristof, Peter V. Kristof, Stephen W. Liblong, and Richard T. OakleyCite this: J. Am. Chem. Soc. 198…
This paper reviews the brittle fracture behavior of dielectric ceramics such as barium titanate, and describes some of the relationships between defects such as cracks and electrical degradation and failure of multilayer capacitors. Stresses arising from the ferroelectric phase transformation in these dielectric mater…
The changes of enthalpy at the irreversible transformation of high-density amorphous ice to low-density amorphous ice and of low-density amorphous ice to ice Ih have been measured in a Tian–Calvet heat-flow calorimeter. The equilibrium pressures of the two transformations have been estimated from the measured enthalpy…
Abstract The effect of Fe oxidation state on the specific surface area, S m , of nontronite was studied using the <2- µ m, Na + -saturated fraction of the SWa-1 and Garfield nontronite reference clays. The reduction of structural Fe 3+ in the octahedral sheet of the nontronite decreased S m as measured by the adsor…
An increase in density is observed on melting of β-cristobalite using the constant-pressure molecular dynamics technique. The formation of vitreous silica from the melt and the structure of the glass formed are also studied.
Metal-semiconductor field-effect transistors (MESFET's) have been fabricated on a boron-doped diamond epitaxial film. This is the first report of a planar type transistor using a diamond film.
The arrays of proteins adsorbed from plasma onto a series of polystyrene copolymeric latexes were analyzed by enzyme-linked immunosorbent assay (ELISA) of washed beads and immunoblotting of proteins desorbed from the beads and separated by polyacrylamide gel electrophoresis (PAGE). Beads were prepared by continuous em…
Aromatic polyurea films with a thickness of less than 1 µm were prepared by vapor deposition polymerization using different kinds of aromatic diamine and diisocyanate monomers. After poling above the glass transition temperature, the films acquired a pyroelectric activity of (1.0–2.5)×10 -5 C/m 2 K, which is comparabl…
A dielectric relaxation peak is reported in ${\mathrm{BaTiO}}_{3}$ and in ${\mathrm{BaTi}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Fe}}_{\mathrm{x}}$${\mathrm{O}}_{3}$. It is nearly monodispersive, centered in the ${10}^{8}$-Hz range, and slowest at the transition temperature ${T}_{c}$\ensuremath{\simeq}413 K f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of the "chiral wall" porphyrin: a chemically robust ligand for metal-catalyzed asymmetric epoxidationsSean O'Malley and Thomas KodadekCite this: J. Am. Chem. Soc. 1989, 111, 25, 9116–9117Publication Date (Print):December 1, 1989Publication Hist…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface studies of polymer blends. 2. An ESCA and IR study of poly(methyl methacrylate)/poly(vinyl chloride) homopolymer blendsJames J. Schmidt, Joseph A. Gardella Jr., and Lawrence Salvati Jr.Cite this: Macromolecules 1989, 22, 12, 4489–4495Publication Date (Print):December…
Isolated “molecular wires” are produced in the channels of zeolites by polymerizing pyrrole with embedded FeIII or CuII ions, according to spectroscopic, stoichiometric, and kinetic investigations. The doped zeolites (zeolite Y and mordenite) display no “bulk” conductivity, but they should be useful for studying the p…