Materials Literature
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Raman spectra were measured for a series of Na 2 O·xZnO·ySiO 2 glasses where x=O to 2 and y = 1,2, or 3. The spectra exhibit bands characteristic of sheet‐like and chain‐like strucrural units. Frequency and intensity shifts with ZnO content suggest that Zn 2+ is a simple network modifier over this composition range.
Abstract Several Pt/TiO2 catalysts were prepared by photodeposition from aqueous H2PtCl6 in the presence or absence of a CH3COOH–CH3COONa buffer. The examination of these catalysts by X-ray photoelectron spectroscopy (XPS) revealed that the higher the buffer concentration, the more highly reduced the deposited platinu…
Abstract PET formulations containing small amounts of nonalkali metal hydroxides were prepared by extrusion from the melt. The efficiency of the hydroxides as nucleating agents was estimated from the elevation of T cc , the crystallization temperature upon cooling from the melt, normalized for the purpose of compariso…
Abstract The structures of both the crystal and the plastic phases of formylferrocene have been determined to be orthorhombic by single-crystal X-ray diffraction. The structural change proposes a mechanism of the transition that postulates the translational molecular motion along the a-axis. Mössbauer spectra observed…
Abstract Irrigated alfalfa ( Medicago sativa L.) was established in 1976 on two Colorado Soils [Keith clay loam (Aridic Argiustolls) and Ravola loam (Typic Torrifluvents)] to determine the residual value of fertilizer P. Triple superphosphate was applied annually at rates of 25 and 50 kg P ha −1 , with 75 kg P ha −1 a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTResonance Raman studies of bis(pyridine) adducts of iron(II), ruthenium(II), and osmium(II) octaethylporphyrins. Effects of heavy-metal substitution on porphyrin and axial-ligand vibrational and electronic propertiesG. Alan Schick and David F. BocianCite this: J. Am. Chem. S…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTResolution of a structural disorder through apparently inconsistent x-ray diffraction and EXAFS data: structure of the new layered system manganese copper phosphorus sulfide (Mn1-xCu2x)PS3 (x = 0.13)Y. Mathey, A. Michalowicz, P. Toffoli, and G. VlaicCite this: Inorg. Chem. 1…
Abstract When two elastomer layers are partially crosslinked in contact with each other, the strength of adhesion increases. This effect has now been studied for simple vulcanizates of SBR and for CR vulcanizates crosslinked with sulfur and/or oxide linkages. Under threshold conditions, e.g. , at high temperatures and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal unimolecular decomposition of glyoxalKo Saito, Terumitsu Kakumoto, and Ichiro MurakamiCite this: J. Phys. Chem. 1984, 88, 6, 1182–1187Publication Date (Print):March 1, 1984Publication History Published online1 May 2002Published inissue 1 March 1984https://pubs.acs.or…
An extension of the tables for the site-symmetry restrictions on the thermal-motion-tensor coefficients to include tensors up to rank 6 (up to rank 8 for cubic, hexagonal, tetragonal and trigonal site symmetries) is presented. The dependence relationships of these symmetric polar tensors are calculated in their natura…
Abstract Elastomeric tetramethylene-ethylethylene-acrylonitrile (TEAN) copolymers were prepared by quantitative selective hydrogenation of emulsion NBR polymers in solution in presence of a triphenylphosphine-liganded rhodium salt catalyst. Completeness of hydrogenation at low pressure required appreciable excess of t…
Abstract The mechanisms of incapacitation resulting from exposures to the thermal decomposition products of flexible and rigid polyurethane foams (PUF) were studied over a range of different temperatures under pyrolytic or non‐flaming oxidative decomposition conditions. Individual cynomolgus monkeys were exposed to at…
Abstract Natural rubber latex was irradiated with γ‐rays from Co‐60 in the presence of polyfunctional monomers to accelerate crosslinking of rubber molecules. Hydrophobic monomers were more effective in accelerating the vulcanization than were hydrophilic monomers. This was ascribed to high solubility of hydrophobic m…
The evolution of the C(1s) x-ray photoelectron spectrum is examined as a function of the size of the polynuclear aromatic molecules. The transition from a symmetric line shape to an asymmetric one occurs in the narrow range of the layer size between 10 and 22 Å. It is shown that the asymmetry reflects the area of the…
The derivation of the generating function given by Bleris & Delavignette [Acta Cryst. (1981), A37, 779- 786] is simplified and made rigorous. It is shown that their main result can also be deduced directly from Grimmer [Acta Cryst. (1974), A30, 685-688]. The following applications of the generating function are descri…
The attack of fluoride on passive nickel has been studied in strongly acidic solutions and weakly acidic and alkaline buffers. Two main potential ranges with different kinetics of metal dissolution were found. In the whole passive range, the corrosion current density is increased. Up to 1.1V, the transfer of the Ni 2+…
Abstract Copolymers of 1,1‐difluoroethene with tetrafluoroethene, chlorotrifluoroethene, and bromotrifluoroethene have been prepared by emulsion polymerization, and their crystallinity has been investigated by means of x‐ray diffraction. The results are discussed in relation to copolymer composition and structure.
Abstract Fundamental kinetic equations for nonisothermal crystal growth from preexisting nuclei are derived, by introducing a concept of reduced time. A method of kinetic analysis of thermoanalytical data of these processes is proposed, and all kinetic parameters can be estimated by the method, so that the process pro…
The model of Uehara and Gillman was used to estimate the amounts of permanent surface charge, and variable surface charge at soil pH, in two soils from the high rainfall region of coastal Queensland. For each soil series, samples from virgin rain-forest were compared with soil collected from nearby sugarcane fields. O…
Abstract Michael additions of the secondary diamines N , N ′‐dimethyl‐1,6‐hexanediamine ( 14 ) or piperazine to the electrophilic carbon–carbon double bonds of N , N ′‐bismaleimido‐4,4′‐diphenylmethane ( 2 ) or N , N ′‐bismaleimido‐1,8‐octane ( 4 ) afford four unusual, high‐molecular‐weight (η inh = 0.49–2.16 dL/g) po…