Materials Literature
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In accordance with the general methods of an earlier paper (reference 1) an integral equation is evolved for the radial distribution function for pairs in a liquid, and an approximate solution is effected for a system of ``hard spheres.'' The form of the function depends on a single parameter λ which can be related to…
X-ray studies have been made of a number of carbon blacks, prepared under different conditions, and subject to various heat treatments. The patterns were made in evacuated cameras, using Cu Kα radiation monochromated by reflection from rocksalt. The patterns consist of crystalline reflections (00l), and two-dimensiona…
Abstract Inasmuch as steam temperatures in modern central stations are approaching those used for the commercial production of hydrogen by reaction between steam and iron, an investigation was undertaken at Purdue University of the corrosion by steam of the various steels which are available for high-temperature servi…
A chart is constructed for converting the apparent magnetic permeability to the true permeability of cylinders of any given ratio of length to diameter. The curves are based on previous calculations in which account was taken of the variation of the demagnetizing factor N with permeability, but in which the permeabili…
From the known structure of the diamond the total surface energy of the crystal has been calculated in terms of the energy of the carbon-carbon bond, and is found to be: 1.50×10−9EB erg cm−2 for the 111 face, and 2.10×10−9EB erg cm−2 for the 100 face, where EB is the energy in ergs per bond. If the bond energy is assu…
Abstract Nach dem aluminothermischen Verfahren wurden die Boride Mo 7 Al 6 B 7 and WB 2 hergestellt. Die Abmessungen der Elementarkörper und die Dichten dieser Substanzen werden angegeben.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of FluorineGeorge H. Cady, Douglas A. Rogers, and Clarence A. CarlsonCite this: Ind. Eng. Chem. 1942, 34, 4, 443–448Publication Date (Print):April 1, 1942Publication History Published online1 May 2002Published inissue 1 April 1942https://pubs.acs.org/doi/10.1021/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase Transition and Elastic Behavior of High PolymersH. MarkCite this: Ind. Eng. Chem. 1942, 34, 4, 449–454Publication Date (Print):April 1, 1942Publication History Published online1 May 2002Published inissue 1 April 1942https://pubs.acs.org/doi/10.1021/ie50388a016https://d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic Activity of an Intermetallic Compound of Cadmium and Copper in the Vapor-phase Reduction of Nitrobenzene.Reuben Joseph GrimCite this: J. Phys. Chem. 1942, 46, 4, 464–469Publication Date (Print):April 1, 1942Publication History Published online1 May 2002Published in…
Electron diffraction was used to measure the rate of the reaction between copper and pure dry oxygen at room temperature and 20 mm. pressure. The experimental technic is described in detail. The empirical rate of reaction is found to be inversely proportional to ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathM…
Clay materials are composed essentially of minute crystalline particles of any one or more members of a few groups of minerals known as the "clay minerals." Using this clay-mineral concept as a point of departure, researches starting from the many fields in which clay materials are important-from agriculture, engineer…
Minerals appearing in clays generally have layer lattice structures formed from (1) uncharged layers with hydroxyl ions on both surfaces, (2) hydroxyl ions on one surface and oxygen ions on the other, (3) oxygen ions on both surfaces; (4) charged layers with oxygen ions on both surfaces; or (5) two types of layers, on…
The characteristic line fluorescence of trivalent europium is excited in certain organoeuropium compounds by irradiation with light absorbed only by the organic part of the compound. The efficiency of excitation varies greatly with the nature of the compound, temperature, and solvent. Under optimum conditions, i.e., s…
Abstract The crystal structures of β gutta-percha, rubber and polychloroprene have been determined by interpretation of X-ray diffraction photographs. β Gutta-percha (—CH2—C(CH3)=CH—CH2—)n is orthorhombic, with axial lengths a0 = 7.78 A, b0 = 11.78 A, c0 = 4.72 A. Four long-chain molecules pass through this cell paral…
Abstract When a drop of ammoniated latex is allowed to touch a cleaned water surface, it spreads rapidly and evenly at the air-water interface, none entering the bulk of the water. Microscopic examination of such a film shows that, given sufficient spreading area, the latex globules are clearly separate one from anoth…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReproducible Contact Angles on Reproducible Metal Surfaces. I. Contact Angles of Water against Silver and Gold1F. E. Bartell and Paul H. CardwellCite this: J. Am. Chem. Soc. 1942, 64, 3, 494–497Publication Date (Print):March 1, 1942Publication History Published online1 May 2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVinylidene Chloride PolymersW. C. Goggin and R. D. LowryCite this: Ind. Eng. Chem. 1942, 34, 3, 327–332Publication Date (Print):March 1, 1942Publication History Published online1 May 2002Published inissue 1 March 1942https://pubs.acs.org/doi/10.1021/ie50387a015https://doi.or…
The Maxwell relaxation theory leading to the concept of a viscous-elastic body is briefly stated. Extensions to systems built up from several such viscous-elastic components with different relaxation times are discussed. In the case of high molecular weight materials, it is more appropriate to assume a continuous dist…
The theory of Schottky emission is extended to include in the current those electrons which tunnel through the top of the potential barrier at the metal surface when rather strong electric fields are used. It is found that these tunnelling electrons contribute to the periodic deviations from the Schottky line, increas…
The problem of the mechanism of diffusion in metallic copper is discussed from the standpoint of the modern theory of metals. Three competing processes are considered in detail, namely the mechanism of direct interchange of atoms, the mechanism of interstitial diffusion, and the mechanism of vacancy diffusion. The ene…