Materials Literature
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Abstract Calcite crystals are grown under pure conditions by the method of counterdiffusion of calcium and carbonate ions in water. An extension of the diffusion method is used making possible the crystallization of calcite in a medium containing calcium or carbonate ions in excess of their stoichiometric amounts in c…
Abstract Products from the thermal decomposition of four polyurethane foams heated to temperatures in the range 220 to 400 °C, in atmospheres of nitrogen, of 6% oxygen in nitrogen and of air were examined for some of the anticipated toxic materials. When phosphorus‐containing inhibitors were added to or chemically inc…
The physical and electrical properties of barium titanate films approximately 1 μm thick, prepared by rf sputtering onto silicon substrates in both pure argon and 95% argon–5% oxygen glow discharges were investigated. The argon-oxygen mixture was used to minimize oxygen deficiencies in the films resulting from the pos…
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Metakaolinite, or metakaolinite with added silica, has been treated with potassium hydroxide solutions to yield six zeolites and the two felspathoids kaliophilite and kalsilite. Among the zeolites K–F, K–M (near-phillipsite), and K–G (near-chabazites) were abundantly and consistently formed. The properties of these ze…
For many years, stannous chloride solutions have been used to prepare surfaces so that they would catalyze deposition from electroless plating solutions. This paper discusses the colloid and solution chemistry of such baths, including the colloid formation, size mediation, and aging processes. The colloid is shown to…
Abstract The results of characterization of the natural rubber vulcanizates are consistent with the results of characterization of the sulfidic products from 2-methylpent-2-ene. In both the model olefin system and the rubber system the initially formed crosslinks are polysulfidic but these are subsequently reduced to…
Abstract Calcium fluoride formed during a 1‐min extraction of calcite (50‐2 µm) with the Bray P‐1 reagent (0.03 M NH 4 F/0.025 N HCl) sorbed added P. Because of the problem in identifying minor components of a whole soil matrix by X‐ray diffraction analysis, it was frequently difficult to positively identify CaF 2 in…
Abstract The cure behavior of SBR and NR compounds was examined using the Monsanto Rheometer. The three cure parameters—induction period ( t d ), rate of crosslinking reaction ( k 2 ) and maximum increase in torque (Δ L )—were derived from the Rheometer torque curves. The data so obtained were used to calculate Westli…
The paramagnetic resonance spectrum of single crystals of RhCl3(PEt2Ph)3 doped with osmium has been measured at 77 K. No hyperfine structure is resolved and the g-tensor has principal values 3.32, 1.44 and 0.32. These values are analyzed using an extended form of the standard theory for low-spin d5, including configur…
A system has been devised for preparing permanent quantitative phytoplankton slides using sedimentation techniques. These slides can then be used with a conventional microscope. A three‐part settling chamber allows separation of the supernatant from the settled material. Water‐soluble mounting medium added to the samp…
Tensile tests at 300°C and structural examination have been carried out on specimens machined from annealed and cold-worked Zircaloy-4 fuel sheathing which had been neutron irradiated at 290°C. The stress-strain behaviour during testing at 300°C has been related to the microstructures observed by transmission electron…
A new and promising operating modus for the pebble-bed reactor has been investigated. Instead of circulating the fuel balls several times through the core they are moved only once slowly from the top to the bottom. Due to the increasing depletion toward the lower core area, there is a substantial axial tilt of the pow…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTESR studies of thermal decomposition mechanisms. II. Electron spin resonance study of the SO2- formation in the thermal decomposition of sodium dithionite, sodium and potassium metabisulfite, and sodium hydrogen sulfiteEdward G. JanzenCite this: J. Phys. Chem. 1972, 76, 2, 1…
The clay minerals in many estuaries of the eastern United States differ from those in the sediments of the rivers that feed these estuaries. Illite and chlorite are characteristic minerals of the estuaries as far south as Chesapeake Bay, yet chlorite is minor and illite is reduced in concentration in the rivers south…
Abstract Calculation methods for the evaluation of the parameters g, D and E for an S = 1 system, from paramagnetic resonance powder spectra are discussed and applied to a number of compounds having the general formula Ni(ligand) 6 (anion) 2 ; in this formula the ligands are nitrogen donors such as nitriles, pyrazoles…
Serrated yielding during the deformation of polycrystalline magnesium–tO wt.-% silver solid solution is reported. The effect of testing temperature and soluteatom concentration on the deformation behaviour is discussed and the dislocation structure developed during jerky flow is examined. The serrated yielding in this…
Abstract Glassy polyamide 6 was obtained by quenching the melt in liquid toluene at 210°K. On the DSC thermogram of such a polyamide a small endothermic peak of glass transition at 310°K, and an exothermic peak at 325°K of cold crystallization are observed (both temperatures were calculated by extrapolation to zero he…
Abstract
It is often commented that the practice of catalysis has preceded its understanding. The comment is nowhere more valid than in the area of catalytic action on transition metal surfaces which is the primary basis of the present review. We shall attempt here to survey some developments which have brought about a renewal…