Materials Literature
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A description is given of an x-ray emission spectrometer with high spatial (4 μm) and energy resolution (0.3-1.2 eV) and of its application to the study of electronic structure of transition metal mono- and disilicides, carbon coatings, vanadium boride and silicon/silicon nitride systems. A comparison is made with oth…
Abstract The reactions of monomaleamic acid derived from an aromatic diamine with furfural afforded a novel class of furfurylidene‐substituted maleamic acids 2a–2d . The latter were cyclodehydrated to yield maleimides 3a–3d which are AB‐monomers for a Diels–Alder polymerization. In addition, N ‐furfurylmaleamic acid (…
X-Ray crystal analysis has revealed that two sulfur atoms of a bis(ethylenedithio)tetrathiafulvalene radical cation, BEDT-TTF+, are coordinated to copper(I) atoms in a –Cu–Br–Cu–(µ-Br)2–Cu– chain, in which each copper atom has a distorted tetrahedral coordination with a sulfur atom and three bromine atoms.
The reactor pressure vessel of a pressurized water reactor can be embrittled by neutron irradiation from the core It has been recognized for many years that copper plays a significant role in the embrittlement process and more recently that copper precipitates pin dislocations In developing fundamental understanding a…
The porous silica gels were prepared from tetramethoxysilane (TMOS)-polyethyleneglycol (PEG)-H2O-methanol solution by the sol-gel process. Microstructure of gel was affected by the composition of starting solutions. The pore diameter of porous gels ranged from 0.1μm to 10μm. The pore diameter increased with increasing…
The crystal structure of the cubic perovskite Sr2FeTiO5.81 has been refined in space group Pmm using neutron powder diffraction data collected at 2 K. There is no evidence for long-range magnetic order. Mössbauer and magnetic susceptibility data show a phase transition in the vicinity of 20 K which has been interprete…
To improve the adhesion between poly(p-phenylene terephthalamide), PPTA, fiber and silicone rubber, the surface modification of PPTA was investigated. Combining plasma treatment and coupling agent treatment with the silicone adhesive was found to be effective in improving adhesion. The combination process made the pul…
Intrazeolite AuI carbonyls (νCO= 2188 cm–1) and nitrosyls (νNO= 1820 cm–1) are formed by the reductive carbonylation of monolayer-dispersed AuCl3 in NaY cages, which exhibit catalytic activity for NO reduction with CO at 300–373 K.
Starburst precursor molecules based on π-electron systems, tri(biphenyl-4-yl)amine and tri(p-terphenyl-4-yl)amine, are found to constitute a new class of amorphous molecular materials with relatively high glass-transition temperatures of 76 and 132 °C, respectively.
The activity of a series of supported Pt catalysts for the hydrogenation of benzene has been evaluated at 80 °C and 1 atm total pressure. Three sets of catalysts with a wide range of percent metal exposed were investigated: Pt/Al2O3, Pt/Al2O3-Cl and Pt/SiO2, with the Cl series obtained by exposure of Pt/Al2O3 to HCl o…
The compound [Cu2(bipy)2(OH)2(CF3SO3)2](bipy = 2,2′-bipyridine) has been synthesised and its crystal structure determined by X-ray crystallographic methods. Crystals are triclinic with a= 8.165(2), b= 14.265(2), c= 18.748(5)Å, α= 93.10(1), β= 100.58(2), γ= 99.17(1)°, space group P, and Z= 3. Least-squares refinement o…
Specialist Periodical Reports provide systematic and detailed review coverage of progress in the major areas of chemical research. Written by experts in their specialist fields the series creates a unique service for the active research chemist, supplying regular critical in-depth accounts of progress in particular ar…
To clarify the difference in the three-dimensional structure of collagen fibrillar networks of several muscles, a cell-maceration/scanning electron microscope (SEM) method was applied for tiger puffer, sardine, carp, and rabbit muscles in parallel to evaluate muscle firmness. Tiger puffer and rabbit muscles, whose tex…
2,6-Permethylated β-cyclodextrin-linked iron and manganese porphyrins catalyse the enantioselective oxygenation of a racemic mixture of (S)-α-pinene and (R)-α-pinene with molecular oxygen under irradiation with visible light.
A new binuclear complex of formula [Cu2(bipym)2(H2O)4(OH)2][ClO4]2·2H2O (bipym = 2,2′-bi-pyrimidine) has been synthesised and its crystal structure determined by X-ray crystallographic methods. It crystallizes in the triclinic space group P, with a= 7.021(1), b= 10.004(1), c= 10.721(1)Å, α= 100.83(1), β= 95.80(1), γ=…
From the seeds of Asclepias curassavica, two cardenolides and twelve glycosides were obtained. Among these, four compounds were determined to be 16α-hydroxycalotropagenin, 16α-hydroxycalotropin and its 3'-O-glucoside and 3'-O-gentiobioside. Normally linked triosides of corotoxigenin, coroglaucigenin and 12β-hydroxycor…
Methyl-substituted derivatives of 1,3,5-tris(diphenylamino)benzene are found to constitute a novel class of amorphous molecular materials, as characterized by differential scanning calorimetry and X-ray diffraction. These compounds readily form stable amorphous glasses having glass-transition temperatures of ca. 50 °C…
The present reference steels for the Phenix fuel subassembly are 15-15T1 for the clad and EM 10 for the wrapper. In this paper the behavior of these materials is described by analyzing the main macroscopic properties (swelling, irradiation creep, tensile, Charpy) and the microstructural evolution observed after irradi…
Recent interest in the theory and modeling of magnetoelastic processes has drawn upon the Preisach model of hysteresis and the anhysteretic model. We have extended our past work with the differential susceptibility model to stresses much larger than residual stress, reaching the local anhysteretic curve and the Villar…
Dielectric properties of CaNdAlO/sub 4/, LaAlO/sub 3/, SrLaAlO/sub 4/, SrLaGa/sub 3/O/sub 7/, and NdGaO/sub 3/ monocrystals, prospective substrate materials for the deposition of thin films of high-temperature superconductors, were measured with high accuracy at frequencies up to 40 GHz in the temperature range 10 to…