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Abstract The problem of preventing calcium sulfate scale deposition has become increasingly important in the last few years due to the increasing use of waterflood as a means of secondary recovery. Many methods have been proposed for removing or preventing scale deposition. A few chemicals and treatment methods have b…
Electron diffraction contrast experiments have been performed to crystallographically characterize the dislocation loops which form during 1100°C annealing of neutron-irradiated tungsten. These experiments show that the loops are essentially pure edge in orientation, lying on or near {111} habit planes and having a/2⟨…
The dielectric and infrared (lattice dynamic) properties of the cubic IV-VI compound semiconductors are reviewed. The values of macroscopic dynamic ionic charge are found to be appreciably larger than the corresponding values for alkali halide and zincblende type crystals. The large values of e(T)*, which arise from t…
Abstract It can be stated that the effect of carbon black in a rubber vulcanizate with regard to dynamic properties can be explained by assuming physical adsorption of rubber on the black surface. The effect can be represented by assuming an adsorbed layer having different properties from the bulk rubber taking the la…
Abstract The molecular weight dependence of the adsorption of polybutadiene on carbon black from a poor solvent, n-heptane, and bulk, i.e. , the phenomenon of “bound rubber”, was investigated. For narrow distribution polymers the adsorption is proportional to M n , where n = 0.14 for adsorption from n -heptane solutio…
Abstract Precise measurements of the solubility of sulphadiazine in water, dimethylformamide (DMF), and a range of mixtures of these solvents have been made at 20°, 30°, and 40°. The solubility of sulphadiazine in the mixtures increases with their DMF content. The partial molar heats and entropies of solution decrease…
Composites made up of MnBi needles embedded in bismuth single crystals are grown from eutectic melts by both Czochralski and zone-melting techniques. The galvanomagnetic properties of the composite are determined mainly by the bismuth matrix. Magnetic measurements reveal a magnetic phase with an anisotropy field of mo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal decomposition of lithium aluminum hydrideMaclyn McCarty Jr., John N. Maycock, and V. R. Pai VernekerCite this: J. Phys. Chem. 1968, 72, 12, 4009–4014Publication Date (Print):November 1, 1968Publication History Published online1 May 2002Published inissue 1 November 19…
Abstract The theory of Cahn and Hilliard is used to derive an equation for the interfacial tension (free energy) between some demixed polymer solutions, applying a simple solution model treated by Debye in his theory of light scattering near the critical solution temperature. For a (symmetrical) system containing two…
Abstract Previously obtained dynamic shear modulus data over a wide amplitude range of rubber vulcanizates loaded with carbon blacks of widely varying structure as well as graphitized black were augmented with dynamic conductivity data at 30° C and at 100° C. Results confirm the existence of reversible transient and i…
The effects of certain variables on a-lactose crystallization were examined. The temperature for optimum crystallization rate varied with the initial supersaturation. Crystallization rate was not directly proportional to seed crystal surface area, probably because of false graining or because mutarotation has a limiti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT ADVANCES IN RHENIUM CATALYSTSWilliam H. Davenport, Valerie. Kollonitsch, and Charles H. KleinCite this: Ind. Eng. Chem. 1968, 60, 11, 10–19Publication Date (Print):November 1, 1968Publication History Published online1 May 2002Published inissue 1 November 1968https://pubs.ac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the addition of hydridopentacyanocobaltate(III) to some .alpha.,.beta.-unsaturated compoundsJack Halpern and Lai-Yoong WongCite this: J. Am. Chem. Soc. 1968, 90, 24, 6665–6669Publication Date (Print):November 1, 1968Publication History Published online1 May 2002P…
The thermal expansion of structures with frameworks of linked octahedra may be broken up into two parts: the changes in shape and size of individual octahedra, and their changes of tilt relative to one another. Expansion due to the second cause, when allowed by symmetry, is generally much greater than expansion of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Ion Valency on the Bulk Physical Properties of Salts of Ethylene-Acrylic Acid CopolymersSergio Bonotto and Eugene F. BonnerCite this: Macromolecules 1968, 1, 6, 510–515Publication Date (Print):November 1, 1968Publication History Published online1 May 2002Published…
Abstract An adiabatic Nernst-Type calorimeter with a cell for condensing a sample vapor as an amorphous state was constructed. By making use of this calorimeter, the heat capacities of the glassy, supercooled liquid, and crystalline states of methanol were measured from 20°K to 120°K. It was found that the state of me…
At 95–115°, paraformaldehyde and hydriodic acid completely C-methylate aromatics such as benzene and phenol. Pyrroles are C-methylated similarly, carbethoxy and acetyl groups being lost. In hydriodic acid at 15–45°, typical pyrroles retain these groups and all free positions are C-alkylated, methylated by paraformalde…
This paper demonstrates how molecular orbital theory can be useful in obtaining chemical information from x-ray absorption spectra. Basic molecular orbital theory concepts such as symmetry and overlap of wavefunctions are used to explain the K-absorption spectra of first-row transition metal complexes. In x-ray K-abso…
The (0001) face of α-Al2O3 has been studied with low-energy electron diffraction. A surface etched with hot phosphoric acid showed the two-dimensional hexagonal 1×1 lattice expected of the bulk (0001) plane. This 1×1 lattice coincides with the lattice of aluminum atoms in this plane. Heating a freshly etched crystal t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPurification and mechanism of action of proline racemaseGeorge J. Cardinale and Robert H. AbelesCite this: Biochemistry 1968, 7, 11, 3970–3978Publication Date (Print):November 1, 1968Publication History Published online1 May 2002Published inissue 1 November 1968https://doi.o…