Materials Literature
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Brillouin scattering spectra of NaNO 2 were observed in the incommensurate (antiferroelectric) phase under a precise temperature regulation. In the temperature dependence curve of the Brillouin frequency shift concerned with a longitudinal acoustic mode propagating along the [010] direction, an anomaly was found at th…
Abstract The < 2 µ m fractions of two fluvio-glacial sediments from East Greenland have been analysed chemically and by XRD and Mössbauer spectroscopy. The bulk of each < 2 µ m fraction consists of feldspars and micas (biotite) which are important constituents of the Precambrian igneous and metamorphic rocks of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn investigation into the electrochemical oxidation of some aromatic amines in the room-temperature molten salt system aluminum chloride-butylpyridinium chlorideJ. Robinson and R. A. OsteryoungCite this: J. Am. Chem. Soc. 1980, 102, 13, 4415–4420Publication Date (Print):June…
Summary The crystal structure of synthetic kogarkoite has been determined from X-ray data collected on an automatic diffractometer. The refinement was performed by a least-squares method employing anisotropic thermal parameters. The 3157 reflections with I > 3 σ(I) converged to a conventional R value of 0.033. The…
BaTiS 3 , black single crystals, (a = 675.6(1), c = 579.8(1) pm, Z = 2, space group P6 3 /mmc, 4-circle-diffractometer 1° ≤ θ ≤ 24°, AgKa, R=3.1%) is isotypic with BaNiO 3 , BaVS 3 , BaTaS 3 .
Abstract Poly(ethylene oxide) was irradiated with pulses of 16 MeV electrons (pulse length up to 100 ns) in aqueous and acetonitrile solutions in the absence and presence of oxygen. The change of the light scattering intensity (LSI) after the pulse was monitored. In acetonitrile solution, at a concentration of 2,3 · 1…
Ribonucleoside-diphsophate reductase from Escherichia coli catalyzes release of fluoride, inorganic pyrophosphate, and base from 2'-deoxy-2'-fluoronucleoside diphosphates. This reaction is accompanied by inactivation of the enzyme and an increase in absorbance at 314 nm of the inactivated protein. 2'-Deoxy-2'-fluoroad…
We present our new approach for preserved subcutaneous vascular network (PSVN) skin transplantation. To confirm the revascularization of the grafts, we undertook a microscopic study and found that, because of the rich anascroscopic study and found that, because of the rich anastomotic communication between the recipie…
Abstract The absolute and relative binding energies for the C 1s , O 1s , and F 1s core levels have been determined using x‐ray photoelectron spectroscopy (ESCA) for a series of aliphatic, aromatic, and fluorine‐containing polycarbonates. Comparisons of these experimentally determined, core‐level binding energies with…
Abstract The thermal behavior of α nylon‐12 film cast from a phenol‐ethanol mixture has been studied by differential scanning calorimetry. Polymorphism has been analyzed by x‐ray diffraction. The γ form exhibits a single endothermic melting peak in the thermogram, whereas the α form exhibits double peaks. Samples with…
An Airy stress function has been used to formulate the internal stresses in an isotropic body in terms of the distribution of inelastic strains under the conditions of plane stress and plane strain. Formulation has been first obtained for the stresses in closed forms for an infinite plane containing a rectangular zone…
The structure of 4-aminopyridine hemiperchlorate, C5H6N2⋅1/2HClO4, has been determined from three-dimensional neutron diffraction data. The crystals are monoclinic, space group P21/n, with cell dimensions a=11.224 (7) Å, b=9.325 (6) Å, c=16.631 (9) Å, β=102.72 (3) ° and Z=4. The structure was refined to an R(F02) =0.1…
It will be demonstrated that the determination of pore structures of chemically modified silica gels is possible by simple chromatographic measurements. Silica gels with different mean pore diameters (60–300Å) have been modified by bonding silanes to their surface. Silanes with different alkyl chain lengths and differ…
Abstract Seven kaolins from Georgia (southeastern U.S.A.), ranging from high to low commercial grade, were characterized by X-ray powder diffraction and chemical techniques to establish that the variation in quality was caused by impurities. The Ca and Cs cation-exchange capacities (CEC) varied from 2.67 to 8.17 and f…
Following a very brief historical review, x-ray diffraction by nematic and smectic liquid crystals is critically examined in terms of the data available and the structural models and molecular theories that have been proposed to explain it. Studiesof TBBA are used to illustrate some of the principal mesophases that ha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEvaluation of a New Zeolitic Catalyst for NOx Reduction with NH3Joseph R. Klovsky, Pramod B. Koradia, and Charles T. LimCite this: Ind. Eng. Chem. Prod. Res. Dev. 1980, 19, 2, 218–225Publication Date (Print):June 1, 1980Publication History Published online1 May 2002Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDistances of electron transfer to and from metalloprotein redox sites in reactions with inorganic complexesA. Grant Mauk, Robert A. Scott, and Harry B. GrayCite this: J. Am. Chem. Soc. 1980, 102, 13, 4360–4363Publication Date (Print):June 1, 1980Publication History Published…
Abstract Direct pyrolysis in the mass spectrometer (MS) yielded unequivocal evidence regarding the mechanism of thermal decomposition of N ‐monosubstituted and N ‐disubstituted polyurethanes. It was ascertained that direct pyrolysis in the MS detects the primary thermal fragments that originate from polyurethane pyrol…
Abstract Botryoidal and fan-shaped masses of polycrystalline calcite pseudospar from Permian biohermal limestones in New Mexico and Texas are interpreted as replacements of radially-divergent, acicular marine cements. The mosaic consists of composites of and individual ray-crystals, with included relicts of square-tip…
Abstract Annealing of poly(ethylene terephthalate) samples crystallized under isothermal conditions above the crystallization temperature has a marked influence on their morphology and results in increased thermal stability of the crystalline structure as indicated by the melting point increase of the samples. The mor…