Materials Literature
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The vaporization rate of solid SiO was studied in the temperature range 1005° to 1475°C. It was concluded that ( a ) in an argon atmosphere the vaporization rate is external gas diffusion controlled; ( b ) only the upper layers of the charge contribute to the vaporization, so that a zero‐order process is observed; ( c…
Abstract The carbonatation of calcium hydroxide has been re‐investigated using thermal and X ‐ray diffraction methods of analysis. The crystal size and morphology of Ca(OH) 2 vary with the method of preparation, which also affects the rate and mechanism of the carbonatation reaction. This is also dependent upon the re…
Abstract It is possible to identify three distinct types of polymer adhesion on the basis of the physical state of adhesive and adherend: ( 1 ) rubbery polymer–rubbery polymer (R–R adhesion); ( 2 ) rubbery polymer–glassy polymer (R–G adhesion); ( 3 ) rubbery polymer–nonpolymer (R–S adhesion). Limitations of the diffus…
The thermal diffusivity of five platinum samples with resistivity ratios of 12, 34, 100, 900, and 5000 has been measured from 300° to 1200°K. Only the sample with the resistivity ratio of 12 showed deviations of more than 3% from the average thermal diffusivity of the two purest samples. Thermal conductivity values ha…
Abstract The α, β, and γ transitions at temperatures between −200 and +100°C. of crosslinked aromatic and aliphatic epoxy polymers were determined from damping and shear modulus data, and compared with their fluorine containing analogs. Loci of segmental relaxation are suggested at various temperatures, and similariti…
Abstract The OH-OD exchange of kaolin minerals through contact with D 2 O introduced into interlayer space via intersalation resulted in a partial shift of the OH absorption bands. The total decrease in OH absorbance upon deuteralion was 52, 56, and 47% for the kaolinite, dickite-nacrite, and halloysite respectively,…
The emission lifetimes of matrix-stabilized dimers of anthracene and its derivatives were observed. The two principal conformations considered were the sandwich excimers and the 55° dimers. The excimer lifetimes may be of use in establishing wavefunctions for these transient states. A comparison of the lifetimes and e…
Abstract Furan, pyrrole, and thiophene were polymerized under catalysis by trichloro‐ and trifluoroacetic acid to produce colored polymers which were characterized by various methods, including electronic and proton magnetic resonance spectra and electrical conductances of deeply colored trichloroacetic acid adducts.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConformational aspects of polypeptide structure. XXIII. Photoisomerization of azoaromatic polypeptidesMurray. Goodman and Martin L. FalxaCite this: J. Am. Chem. Soc. 1967, 89, 15, 3863–3867Publication Date (Print):July 1, 1967Publication History Published online1 May 2002Pub…
Dense lithium ferrite ceramic bodies prepared by hot‐pressing exhibited rectangular hysteresis loops. A number of physical properties of technical interest were evaluated and results given. These include initial permeability, dc resistivity, resonance Une width, g eff factor, and saturation magnetization. The effect o…
Perhaps the best theoretical approximation to the experimentally observed attenuation and spreading of seismic body waves is due to Futterman. Wuenschel has utilized the Pierre shale field data of McDonal et al. as well as his own two-dimensional model work using plexiglas sheet, to obtain remarkable confirmation of F…
Pyrocatechasewas purified from extracts of benzoateinduced cells of Pseudomonas arvilta.The most purified preparation had a specific activity of 29.6, about 50% higher than that previously reported, and was homogeneous as judged by ultracentrifugation and by electrophoresis.The molecular weight was estimated to be app…
An experimental technique has been developed for the absolute measurement of the density of a surface charge on a dielectric. The apparatus is described and includes provision for producing the surface charges by electron and ultra-violet irradiation, and by the contact of metal electrodes of known differences in work…
Abstract On décrit le formalisme de la méthode LCAO SCF CO permettant d'étudier les propriétés des systèmes périodiques conjugés et un procédé semi‐empirique pour évaluer les intégrales intervenant dans les éléments de matrice de l'operateur du champ autocohérent de ces systèmes.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReduction of Friction in Oil Pipelines by Polymer AdditivesArie Ram, Ehud Finkelstein, and Chaim ElataCite this: Ind. Eng. Chem. Process Des. Dev. 1967, 6, 3, 309–313Publication Date (Print):July 1, 1967Publication History Published online1 May 2002Published inissue 1 July 1…
Abstract The degree to which HAF black restricts the swelling of natural rubber vulcanizates in n -decane has been determined using a vulcanizing system in which the stoichiometry of crosslinking is unaffected by the carbon black. The dependence of the degree of restriction, as measured by the ratio of the volume frac…
Abstract The adsorption of various alkylammonium cations from aqueous solution by sodium and calcium montmorillonite has been studied. Adsorption occurred through an exchange reaction between the inorganic cations on the clay and the alkylammonium ions in solution. The affinity of the clay for these cations was linear…
Abstract Die Menge der an der Oberfläche gebundenen OH‐Gruppen wurde bei einem feinteiligen Anatas durch Deuterium‐Austausch, Acetylierung und Reaktion mit SOCl 2 bestimmt. Nach Entgasen bei 150° wurden etwa 4,9 OH‐Gruppen/100 Å 2 gefunden, gegenäber einer fär eine vollständig hydroxylierte Oberfläche abgeschätzten Me…
Small metal particles have been formed on α-Al2O3 films and equilibrated to give the minimum surface energy shapes. Determination of the equilibrated shape by transmission electron microscopy allows the interfacial energy of the solid-solid system to be determined. Values of γ interface are given for the systems Au, A…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRare earths. IV. Dissociation energies of the gaseous monoxides of the rare earthsLynford L. Ames, Patrick N. Walsh, and David WhiteCite this: J. Phys. Chem. 1967, 71, 8, 2707–2718Publication Date (Print):July 1, 1967Publication History Published online1 May 2002Published in…