Materials Literature
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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…
Raman microline focus spectrometry (MiFS) has been used to show that hydrogen containing amorphous carbon (a-C-H) films are readily annealed by a focused argon ion (514.5 nm) laser operating at a power typical of that used for conventional Raman microscopy. The annealing process produces microcrystallites of disordere…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and defects in discotic crystals and liquid crystals as revealed by electron diffraction and high-resolution electron microscopyI. G. Voigt-Martin, R. W. Garbella, and M. SchumacherCite this: Macromolecules 1992, 25, 2, 961–971Publication Date (Print):January 1, 19…
The authors present an analytical calculation of the neutral particle distribution and its effects on ion heat and momentum transport in three-dimensional plasmas with arbitrary temperature and density profiles. A general variational principle, taking advantage of the simplicity of the charge exchange (CX) operator, i…
Use of ultra-high strength polyethylene (UHSPE) fibers in composites has been limited by problems with adhesion to the matrix. In this study we present a gas plasma treatment of UHSPE fibers (Spectra 900™ and 1000™) to improve adhesion in poly(methyl methacrylate). The gases used were nitrogen, argon, and carbon dioxi…
Four new glucosides, bungeiside-A, -B, -C, and -D, were isolated from the roots of Cynanchum bungei Decne. The structures of the new compounds were determined by chemical and spectroscopic methods, including two-dimensional nuclear magnetic resonance (2D NMR) techniques, especially 1H-detected heteronuclear multiple-b…
The treatment of certain cases of corrosion in living environments involves the consideration of two quite different disciplines, namely biology and corrosion. Either one or the other will be preponderant, according to the problem and the circumstances, and the two aspects are not necessarily permanently interdependen…
Abstract A series of substituted 2-hydroxychalcones (HC) were prepared, most of which underwent efficient and clean photochemical conversion into flavylium cations (FV) in acidic solution and polymer film, although strongly dependent on the pH and medium conditions as well as the HC structures. 4′-Methoxy and 4′-dimet…
Thin films of octaalkyl-substituted phthalocyanines were prepared by spin coating. The films were remarkably smooth and showed optical absorption spectra with Davydov splitting, characteristic of crystalline order, similar to those of structurally related compounds prepared by the Langmuir–Blodgett technique. The crys…
A spectroscopic method has been used to determine the number of coordinated water molecules bound to the central lanthanide ion in a series of polyaminopolycarboxylate complexes. It was found that in complexes of simple polyaminotricarboxylates, almost 4 waters of hydration were bound at the inner coordination sphere…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface selectivity in blending polyethylene-poly(ethylene glycol) block cooligomers into high-density polyethyleneDavid E. Bergbreiter and B. SrinivasCite this: Macromolecules 1992, 25, 2, 636–643Publication Date (Print):January 1, 1992Publication History Published online1…