Materials Literature
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Thermal expansion of β-Mg2SiO4 (modified spinel; orthorhombic symmetry) was measured by the X-ray powder diffraction method in the temperature range between 20°C and 800°C. Grüneisen's theory of thermal expansion was applied to the linear and volume expansion data, and thermal expansion coefficients were obtained to b…
The dilute solution dynamics of spheroid–cylindrical molecules, i.e., straight cylinders with oblate, spherical, or prolate hemispheroid caps at the ends, is studied in detail. The translational and rotatory diffusion coefficients and the dynamic intrinsic viscosity are evaluated numerically for short cylinders by det…
One of the major causes of failure of conventional stainless steels in sea water and other chloride containing environments is attack by crevice corrosion with the result that several special grades with improved resistance have been developed. A new technique has been developed using a mathematical model combined wit…
A significant effort has been devoted during the last 10 years to develop a route to thermally stable polymers without the evolution of volatile by-products. Most high-temperature polymers are prepared by condensation polymerization which involves the elimination of volatiles. These volatiles are responsible for sever…
Abstract Four solvents of cellulose have been studied by using 13 C‐NMR spectroscopy. All these solvents, N ‐methyl morpholine‐ N ‐oxide, methylamine, hydrazine, and paraformaldehyde (PF), contained dimethyl sulfoxide (DMSO) as a cosolvent. Oligomers of cellulose of DP = 10 soluble in hot DMSO have been used as model…
ADVERTISEMENT RETURN TO ISSUEPREVArticleOrbital reversal in (oxalato)copper(II) linear chainsJ. J. Girerd, O. Kahn, and M. VerdaguerCite this: Inorg. Chem. 1980, 19, 1, 274–276Publication Date (Print):January 1, 1980Publication History Published online1 May 2002Published inissue 1 January 1980https://pubs.acs.org/doi/…
Abstract The initial stage of the suspension polymerization of poly(vinyl chloride) (PVC) is characterized by the formation of colloidally stable micron‐sized grains of PVC inside the polymerizing ca. 150 μm vinyl chloride droplets. The fate of these micron‐sized PVC grains depends upon the agitation conditions. If no…
Abstract High pressure CO 2 sorption data in polycarbonate (PC) are reported as a function of temperature and thermal history. The bulk physical structural changes produced by annealing at 125 and 135°C were monitored by density and thermal property changes. The sorption data are analyzed by the dual sorption model wh…
The quantitative determination and depth profiling of fluorine in the surface region of various substrates using nuclear reaction microanalysis was studied. Differential cross sections and excitation functions for the reaction 19 F(p, α 0 ) 16 O and 19 F(p, α γ) 16 O were investigated in great detail, especially in th…
R. G. Godden and D. R. Thomerson, Analyst, 1980, 105, 1137 DOI: 10.1039/AN9800501137
Abstract The isothermal crystallization of isotactic polypropylene at different temperatures in the presence of fibrous substrates has been investigated. It is shown that preferential transcrystalline growth occurs at the fiber surface and that changes in nucleation density in the bulk material adjacent to the fibers…
Twenty‐one mineral soils of different physicochemical properties were used in this study. Soil suspensions, 30 grams of soil in 150 ml of distilled water, were shaken for 96 hours at 200 rpm and 25±1°C. The activity of H4SiO4°, maintained in soil suspensions after shaking for 96 hours, was higher than quartz, cristoba…
A pyrolysis-gas chromatograph with flame photometric detection is used to determine the levels of certain nonvolatile, aliphatic sulfur-containing additives in polymers. The additive is extracted from the polymer with a suitable solvent, 2 μl of the solution is placed on the pyrolyzer ribbon, and the solvent evaporate…
(Ni, Co)3Al4 is a ternary phase in the Al-Ni-Co system, the homogeneous range at room temperature being 55-58.5 A/0 Al, 26-35 A/0 Ni, and 10-15.5 A/0 Co. It belongs to the cubic system with space group Oh10-Ia3d. There are 112 atoms per unit cell, the lattice spacing at room temperature being α = 11.3962?.This structu…
A practical technique is presented for the numerical solution of general three-dimensional electrodynamic field problems. Circuit models are derived separately for the electric and magnetic parts of the field. Conventional network-analysis techniques are then developed to isolate the independent closed paths that link…
Cascades of atomic collisions created by high energy particles as a result of irradiation of solids by them are considered. The solution of the problem is based on the investigation of the Boltzmann stationary kinetic equation for moving atoms. For this equation a model scattering indicatrix is constructed with an arb…
Some day hydrogen may be used as a viable energy storage and transport medium within the United States. Hydrogen gas may be used to dilute and extend our present methane supply as a blend or may even be used in its pure elemental form as a primary fuel. Independent of the methods of production, storage, and distributi…
Abstract The dehydrogenation of cyclohexane to benzene on a platinum‐rhenium/aluminium oxide (Pt‐Re/Al 2 O 3 ) catalyst was investigated using both pulse and continuous flow techniques with hydrogen and inert (N 2 , He, Ar) diluents at the following conditions: 1 and 4 atm (1 atm = 101 kPa) total pressure and 432–623…
Chemical shifts, ΔE, of the K-absorption discontinuity in several compounds of copper possessing formal oxidation states between 0 and III have been measured. The shifts show a parabolic dependence on the formal oxidation state as well as on the effective atomic charge, q, on copper. Anomalous chemical shifts shown by…
Al substituted barium ferrite particles BaFe12-xAlxO19 with 0? x ?0.8 have been prepared by ball milling method. X-ray diffraction (XRD) has shown that the average crystallite size for all samples under investigation is in the range 66 76 nm.