Materials Literature
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Abstract Es wird an mehreren Hydroxy‐ und Amino‐phenoxazonen und ihren Acetaten gezeigt, daß Phenoxazone im IR‐Spektrum zwischen 6.0 und 6.5 μ drei charak‐teristische Schlüsselfrequenzen besitzen. Die Verschiebung der längstwelligen Bande im sichtbaren Spektrum dieser Verbindungen mit Säure und Alkali hängt von der St…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSTEROIDAL LACTONESJ. A. Cella and C. M. KagawaCite this: J. Am. Chem. Soc. 1957, 79, 17, 4808–4809Publication Date (Print):September 1, 1957Publication History Published online1 May 2002Published inissue 1 September 1957https://pubs.acs.org/doi/10.1021/ja01574a058https://doi…
A previously published phenomenological theory of the statistics and time dependence of the creep failure of oriented polymeric filaments is here applied to bundles of filaments. The mathematical apparatus of the theory of stochastic processes is used to calculate relationships between the strength of filament bundles…
Abstract A montmorillonite suspension was placed in a miniature compression chamber bounded on one side by a cellulose membrane supported by a water saturated porous Alundum disk, and on the other by a rubber film. Changing the ambient pressure on the film caused water to move across the membrane until the swelling pr…
The dielectric constants ${\ensuremath{\epsilon}}_{b}$ of tri-glycine sulfate and tri-glycine fluoberyllate show a pronounced anomaly at the Curie temperature of 48\ifmmode^\circ\else\textdegree\fi{}C and 70\ifmmode^\circ\else\textdegree\fi{}C, respectively. The dielectric constants ${\ensuremath{\epsilon}}_{a}$ and $…
The reactions which take place in the system MgO-MgSO4-H2O at concentrations of MgSO4 solutions up to saturation and temperatures from 30 to 120 °C have been studied in detail. Four oxysulphates have been found, namely, 5Mg(OH)2.MgSO4. 3 or 2H2O, 3Mg(OH)2.MgSO4.8H2O, Mg(OH)2. MgSO4.5H2O, and Mg(OH)2.2MgSO4.3H2O, and a…
The thermal conductivity of Al 2 O 3 , MgO, TiO 2 , and CaF 2 single crystals and single‐phase poly‐crystalline aggregates of controlled microstructure was measured between 0° and 1000°C. The conductivity of pure single‐phase dense polycrystalline aggregates agrees with that of the corresponding single crystals at tem…
A method of measuring the first magnetic anisotropy constant, ${K}_{1}$, of cubic crystals having a large anisotropy was developed which utilized measurements of the torque for directions of the applied field near the direction of easy magnetization. By this method ${K}_{1}$ of a cobalt ferrite crystal was found to be…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of the Charge Density of Silica SolsG. H. BoltCite this: J. Phys. Chem. 1957, 61, 9, 1166–1169Publication Date (Print):September 1, 1957Publication History Published online1 May 2002Published inissue 1 September 1957https://pubs.acs.org/doi/10.1021/j150555a007h…
The morphology and orientation of a number of polymers as crystallized from solution was studied with the electron microscope combined with selected area electron diffraction. In the course of this work single crystals could be prepared which were most striking in the case of straight chain polyethylenes. There is evi…
1. Properties of X-rays. 2. Geometry of Crystals. 3. Diffraction I: Directions of Diffracted Beams. 4. Diffraction II: Intensities of Diffracted Beams. 5. Diffraction III: Non-Ideal Samples. 6. Laure Photographs. 7. Powder Photographs. 8. Diffractometer and Spectrometer. 9. Orientation and Quality of Single Crystals.…
Abstract A study of the polymerization of acrylonitrile in NN-dimethylformamide solution at 60°C in the presence of a number of lithium salts, including a determination of the absolute velocity coefficients, has been made. The coefficients for the propagation reaction and the transfer reactions to triethylamine and ca…
Abstract It is supposed that a region within an isotropic elastic solid undergoes a spontaneous change of form which, if the surrounding material were absent, would be some prescribed homogeneous deformation. Because of the presence of the surrounding material stresses will be present both inside and outside the regio…
A method is developed to include polarization effects in low-energy scattering of electrons from atoms, within the Hartree-Fock formalism. This description is different from the usual expansion in terms of the eigenfunctions of the atom. The method associates with each atomic orbital perturbed or polarized parts which…
The elementary theory of secondary electron emission developed by Salow, Bruining, Baroody, and others has been generalized and modified to incorporate recent measurements by Young of the range-energy relation and the dissipation of energy by slow electrons in solids. It is found that these modifications give consider…
Abstract Manganese-rich γ phase alloys of manganese + copper have been investigated by neutron and X-ray diffraction techniques, and the temperature variations of magnetic susceptibility and electrical resistivity have been measured. The disappearance of long-range antiferromagnetic ordering has been correlated with t…
Abstract The efficiency of the oxidative chain scission in natural rubber vulcanizates has been measured for a simple MBTS vulcanizate with and without antioxidants. This was accomplished by making concurrent measurements of the chain scission velocity and oxidation rate. The chain scission velocity was obtained from…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorrosion Resistance of Copper and Copper AlloysArthur I. HeimCite this: Ind. Eng. Chem. 1957, 49, 8, 63A–66APublication Date (Print):August 1, 1957Publication History Published online25 May 2012Published inissue 1 August 1957https://pubs.acs.org/doi/10.1021/i650572a754https…
The causes of hysteresis in the adsorption isotherms on porous Vycor glass are discussed, employing as ancillary evidence the dimensional changes of the adsorbent. Diagrams of domain complexions for pores of the ink-bottle type are given and used to develop certain of Everett's theorems. Evidence showing the interdepe…
Abstract Cellulose nitrate was degraded ultrasonically at 0 to 85°C. in the alkyl acetates from methyl to heptyl. In each solvent there is a high and low limit temperature where cavitation and degradation both cease. The upper limits are at the temperatures where vapor pressure of the solvent is about one‐half atmosph…