Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTHexagonal Columns of Poly(n-alkyl propiolate) Produced with Rhodium Complex Catalyst. X-ray Analysis and Oxygen PermeabilityM. Tabata, Y. Sadahiro, Y. Nozaki, Y. Inaba, and K. YokotaView Author Information Department of Molecular Chemistry, Graduate School of Engineering, Hokka…
The local structure around Mo atoms in Mo−Mg binary oxides has been investigated by X-ray absorption spectroscopy at Mo and Mg K edges. XANES and EXAFS spectra show that the binary oxides have a tetrahedral MoO 4 unit in the samples with a Mo/(Mo + Mg) ratio of less than 0.5 and an octahedral MoO 6 unit in the samples…
Composite membranes composed of commercial anion exchange membranes and polypyrrole were prepared by chemical oxidation of pyrrole in the membrane matrix. Two different procedures were used: immersing the anion-exchange membranes equilibrated with a ferric chloride solution into an aqueous pyrrole solution; immersing…
A non commercial θ–θ energy dispersive X-ray diffractometer equipped with a solid state detector has been used for the determination of the amorphous structures of nine mixed hydroxycarbonates containing Co, Cu, Zn and Al. Energy dispersive X-ray diffraction (EDXD) provides information about the local order around the…
Di-μ-chlorobis(η 3 -2-methylallylplatinum) reacts with imines HL n = p- C n H 2 n +1 O−C 6 H 4 −CH N−C 6 H 4 −OC n H 2 n +1 - p ( n = 6, 1a; n = 2, 1b ) to yield the C,N-cyclometalated platinum(II) compounds [Pt 2 (μ-Cl) 2 (L n ) 2 ] ( 2a, 2b ). From 2, other types of dinuclear complexes [Pt 2 (μ-X) 2 (L n ) 2 ] with…
The present paper discusses the dynamics of recombination processes in PbI 2 nanocrystals embedded in porous silica films. The photoluminescence (PL) spectrum of the samples consists of three bands: an exciton band near 2.5 eV and two deeper bands centered at 2.44 eV (L band) and 2.03 eV (G band). The L band relates t…
We investigated the effect of second-harmonic superimposition (SHS) on the oxidation of iodide ions induced by ultrasound with two frequency components: 1.03 and 2.06 MHz. With SHS, the oxidation rate reached a maximum when the acoustic intensity ratio of the fundamental to the second harmonic was about 1:1, while con…
Carbothermic reduction of boric acid has scientific and economic advantages over other methods of boron carbide production. The strongly endothermic reaction which has a favourable free energy change only at high temperatures is best carried out in a specially designed graphite resistance furnace at temperatures above…
The X-ray photoelectron spectra of eight polymers [(CH 2 CH 2 ) n, (CH 2 CH 2 NH) n, (CH 2 O) n, (CH 2 CH 2 S) n, (CH 2 CHX) n, and (CH 2 CX 2 ) n (X = F, Cl)] were analyzed by the deMon density-functional method using the model oligomers. Calculated AIK α valence photoelectron spectra were obtained using Gaussian lin…
The addition of a solution of 6 mmol of NaNO2 to an aqueous solution containing 3 mmol of Ni(NO3)2·6H2O and 3 mmol of OHpn produces the brown complex [Ni7(μ-NO2)8(μ2-OH)2(μ3-OH)2(OHpn)2(Opn)2]2·7H2O (OHpn is the 1,3-diamino-2-propanol), which is characterized by X-ray crystallography and magnetic susceptibility measur…
The formation of mullite was investigated using microcomposite powders which consist of α‐alumina cores and amorphous silica coatings. Differential thermal analysis and X‐ray diffraction showed that the mullitization reaction was endothermic. In contrast, mullite forms exothermically in samples prepared by sol‐gel pro…
The aim of this paper was to study the evolution of furosine, pyroglutamic acid, and uridine and rheological characteristics of albumen from shell eggs stored over long times at 30, 20, and 5 °C. The chemical variables showed an increase in function of the storage temperature with more evident variations at room tempe…
Either portland cement or magnesium oxychloride cement was used as binders for concretes that incorporated fine rubber aggregate, ranging from 0 to 25 percent by volume. The concretes were tested for their compressive and split tensile strengths to determine whether the use of a magnesium oxychloride cement along with…
The structural relaxation process in polystyrene and three polystyrene derivatives ( p -methyl, p -chloro, and p -hydroxy) at temperatures close to the glass transition temperature has been monitored by differential calorimetric measurements of the heat capacities of the polymers after they were subjected to several d…
( S )-((2-Methylbutyl)thio)hydroquinone was prepared from benzoquinone and ( S )-2-methylbutyl mercaptan. One series of cholesteric copolycarbonates was prepared from this chiral hydroquinone, methylhydroquinone, and 4,4‘-dihydroxybiphenyl by interfacial polycondensation with diphosgene. All copolycarbonates were nonc…
The influence of microstructure and inclusion on the susceptibility to stress oriented hydrogen induced cracking, SOHIC, or type I sulfide stress cracking, SSC, was investigated for two kinds of line pipe steels which have the different susceptibility to SOHIC. The steel plates, produced by accelerated cooling after c…
Addition of natural clay materials in intumescent polypropylene-based formulations (additive: ammonium polyphosphate and pentaerythritol) leads either to a decrease or to an increase of their fire retardant performances versus the chemical or the physical characteristics of the clay materials. A study of the factors a…
The steps required for the development of a Zr-2.5Nb pressure tube with a 30-year service life are outlined. The life-limiting factors of fracture and deformation are described, and progress towards closing the gap between the properties required to meet the target lifetime and the behavior of current materials is sum…
A diamond-bearing eclogite has been studied using industrial high-energy computed tomography and volume visualization techniques. Using this non-destructive technique, in which distinction between phases is based on density differences, seven diamonds (five completely enclosed in the rock) have been isolated and viewe…
The surface morphology of thin molten films of phase separating mixtures of poly(ethylenepropylene) (PEP) and perdeuterated poly(ethylenepropylene) (dPEP) of the critical composition were investigated using scanning force microscopy. Volume fraction versus depth profiles were also obtained using time-of-flight forward…