Materials Literature
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Tritium retention measurements have been performed for two carbon composites both before and after neutron irradiation. These two composites were FMI-222 manufactured by Fiber Materials Incorporated and MKC-1PH by Mitsubishi Kasei. The neutron irradiations were performed in the High Flux Isotope Reactor (HFIR) at Oak…
The effect of specific ions present during the precipitation of alumina precursor (aluminum hydroxide) on resulting alumina surface acidity has been investigated. It was found that both the method of pH control and the nature of ions introduced to the slurry apparently affected the phase composition of aluminum hydrox…
Reactions of benzophenone ketyl radicals with the water-soluble iron(III)porphyrin, [FeIII(tpps)]3–[tpps =meso-tetrakis(p-sulfonatophenyl)porphyrinate], and a nitric oxide adduct of the iron(II) form of the porphyrin, [FeII(tpps)(NO)]4–, have been studied by laser photolysis in aqueous solutions. Reactions of ferricyt…
The possible use of tungsten as divertor target material is discussed. In addition to its extremely low sputtering yields, another very favourable aspect of this material is the high probability of prompt redeposition. First experimental observations are encouraging. The erosion fluxes from a tungsten target tile are…
Diffusible hydrogen behavior in zinc electrogalvanized high strength steel has been investigated by use of a newly developed hydrogen content determining method for better understanding of delayed fracture of electrogalvanized high strength steel.For as-electrogalvanized high strength steel, there are two peaks on the…
Structure factors for small, hydrothermally grown samarium orthoferrite, SmFeO3, were measured with focused A = 0.7 A synchrotron radiation. Approximate high symmetry in the Ap images indicates that cations deform the electron density far more strongly than the O atoms. The most obvious effect is on distribution of th…
Partial substitution of La by Ag, instead of Sr, in LaMO3(M = Co, Mn, Ni) perovskite causes a large increase in the catalytic activity of the perovskite in the complete combustion of dilute methane for its emission control, at low temperature (< 700 °C) and high space velocity (51 000 cm3 g–1 h–1); Ag-doped LaCoO3 sho…
Swelling vermiculite clays are ideal systems in which to study confined aqueous and organic fluids. The clay platelets themselves are well characterised and carry a negative charge of around 0.1–0.2 C m–2. To balance this negative layer charge a variety of interlayer counterions can be exchanged into the clay pores. T…
New research and development needs for the drying of ceramics are prooosed. The researches on the ceramic drying are briefly reviewed and the role of the drying in the ceramic production process iS summarized. The drying must deal with molded materials and the problem is of significant difference from another drying w…
The capillary flow porometry(CFP)technique, known as the bubble point method, has been applied to measure the entire pore size distribution (PSD)of nonwoven geotextiles. The classical technique is based on the differential analysis of two test runs: a wet run, during which the specimen is saturated by a wetting fluid,…
Abstract Twelve bacterial isolates, four of them assigned to the genus Acinetobacter , were taken from sewage of a treatment plant with Enhanced Biological Phosphorus Removal (EBPR) and screened for phosphorus uptake, polyphosphate (polyP) accumulation and adsorption under limited carbon and nitrogen conditions. In ad…
The catalytic effect of dielectric packings inside the discharge gap on the yield of ozone generation was studied under silent discharge conditions. Porous silica of developed internal surface and quartz glass grains were used as the packings. In the presence of coarser grains of both materials, higher ozone concentra…
The new material is composed of alternating bonded layers of high strength aluminum sheets and unidirectional hybrid FRP layers. A hybrid FRP layer is also composed of a CFRP layer sandwiched in between two KFRP layers. The CFRP layers prevent kink band formation in the KFRP layers. The KFRP layers prevent growth of m…
The polyethylene powders studied were synthesized by both slurry and gas-phase processes at temperatures ranging between 30 and 85 °C. Fibers were drawn from these nascent powders under identical processing conditions. The maximum achievable draw ratio was found to be strongly dependent on synthesis conditions. Highes…
We discuss macroemulsions stabilized by silver interfacial colloidal films and the effect of dithizone on them. These emulsions are characterized by a very sharp size distribution. We find that dithizone, which is known for its strong interaction with silver, strongly affects the state of flocculation of the colloid.…
The charge transfer (CT) excited states of Ru(II)OEP(Py) 2 and Ru(II)TPP(Py) 2 (TPP = tetraphenylporphyrin, OEP = octaethylporphyrin, and Py = pyridine) have been investigated by nanosecond time-resolved resonance Raman (TR 3 ) spectroscopy. The spectra reveal unexpected differences between the two species. The TR 3 s…
The tetranuclear copper(II) complex [{Cu(O2CMe)(OMe)}4] has been found to contain an unusual open cubane Cu4O4 framework defined by two interpenetrating copper and oxygen planes rather than two tetrahedra; it also shows strong antiferromagnetic coupling.
Abstract Ordered polymeric networks are produced via the photopolymerization of liquid‐crystalline (LC) diacrylates. When these diacrylates are derived from aromatic rings, the networks show UV‐light instability. In order to overcome this problem, the cyclohexane analogues of two of these LC diacrylates were synthesiz…
Thiophene-fused DCNQI compounds yield conducting CuI complexes built up of a unique three-dimensional supramolecular coordination structure in which the zigzag ladder CuI polymers are bridged by the π-stacked acceptors as a bidentate ligand.
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTAbsence of Noncyclic Imide Formation in PMDA−ODA PolyimideJ. M. Konieczny and S. L. WunderView Author Information Department of Chemistry, 016-00, Temple University, Philadelphia, Pennsylvania 19122 Cite this: Macromolecules 1996, 29, 23, 7613–7615Publication Date (Web):Novembe…