Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer Chemistry of the Linear SiloxanesE. L. Warrick, M. J. Hunter, and A. J. BarryCite this: Ind. Eng. Chem. 1952, 44, 9, 2196–2202Publication Date (Print):September 1, 1952Publication History Published online1 May 2002Published inissue 1 September 1952https://pubs.acs.or…
A new theory of metal transfer and wear is suggested in this paper. The essence of the theory is as follows: Metal transfer and wear take place at points of actual contact. The interfaces of the high spots that actually make contact are roughened as the result of plastic deformation when they carry normal load. The me…
For a ferromagnetic specimen exhibiting magnetic viscosity, the intensity of magnetization increases continuously with time under steady external field conditions An account is given here of investigations to determine the influence on magnetic viscosity of changes in the magnetic field applied to the specimen, two ca…
Alamosite was first described by Palachc and Merwin, i who thought it might be isomorphous with wollastolfite. For that reason it has been re-examined, using X-ray methods. A specimen from the original locality at Alamos, Sonora, Mexico (B.M. 1910,330) was made available through the courtesy of the British Museum (Nat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Solubilities of Oleic and Linoeic Acids in Common Organic SolventsC. W. Hoerr and H. J. HarwoodCite this: J. Phys. Chem. 1952, 56, 9, 1068–1073Publication Date (Print):September 1, 1952Publication History Published online1 May 2002Published inissue 1 September 1952https:…
Monoclinic K-feldspars and triclinic Na-feldspars at high temperatures form a "continuous" series of mix crystals. The apparent lack of a discontinuity in the monoclinic-triclinic solid-solution series has been puzzling. A transition from monoclinic to triclinic symmetry was found to exist and is here described. The c…
The equation logη=A+B/(T+C) is obtained as a simple modification of Andrade's viscosity equation by treating the activation energy as a function of temperature, A, B, and C being free parameters. This is shown statistically to express adequately the temperature dependence of viscosity over substantial ranges of temper…
MONTGOMERY AND ZIPPIN PROC
The direction of dendrite growth has been determined as a function of crystallographic orientation for high purity tin and zinc, using a single crystal decanting technique. Measurements are reported on the rate of dendrite growth in lead, and the spacing between dendrite rows of a lead crystal for varying amounts of s…
Abstract The authors previously presented a method for predicting the tendency of oilfield waters to deposit calcium sulfate. The present paper gives a similarmethod for calcium carbonate. Methods for predicting calcium carbonate scaling tendencies in fresh watershave been available for some time, but these could not…
Abstract A mechanism is proposed for the degradation of natural rubber by the cold mastication process. The rubber hydrocarbon is considered to be ruptured into free radicals by the deformation of the rubber. These recombine, or react with oxygen or other suitable reactant, and thereafter do not necessarily recombine.…
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Clear, synthetic rutile (Ti${\mathrm{O}}_{2}$) single crystals have been investigated by electrical and optical methods. It seems possible to correlate the high temperature conductivity (${E}_{G}=3.05$ ev) with the threshold of optical absorption at low temperatures (3.03 ev) and with the maximum of the photoconductiv…
Abstract Theoretical and practical evidence is put forward to show that copolymers can be treated like solutions of small molecules in the interpretation of packing phenomena, and that ideal volume‐additivity of the repeating units in copolymers is frequently realized. On this basis equations are derived for predictin…
Abstract An account is given of the derivation and properties of a spin-Hamiltonian which has recently been used to describe the results of magnetic resonance experiments on nickel Tutton salts. It is obtained on the assumption that the nickel ions are situated in a field of rhombic symmetry. A theory of line widths i…
Abstract Gelatin films prepared by evaporation from aqueous solution at temperatures of 60°C and above differ considerably in structure and mechanical properties from films dried slowly at 20°C, when gelling precedes dehydration. In the high-temperature preparation dehydration precedes the formation of a continuous st…
Abstract Electron-optical systems with curved axes—such as mass spectrographs and certain beta-ray spectrometers—have long been in practical use, but there has been available no complete theory of the aberrations of such systems. It is the object of the present paper to construct such a theory and to demonstrate, by a…
The major part of the anisotropy in the paramagnetic susceptibility of Mn${\mathrm{F}}_{2}$ above the Curie point, as measured by Stout and Griffel, can be accounted for by magnetic dipole interactions. These interactions affect the anisotropy in different ways above and below the Curie point and lead to an anisotropy…
Abstract Examination of the paraffin n-hectane in the electron microscope has given evidence of two different growth mechanisms for crystals of this compound. The one corresponds to the spiral growth mechanism already observed for n-hexatriacontane (Dawson & Vand 1951), and the orthorhombic lozenge-shaped crystals…