Materials Literature
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Diffusion in solids is known to occur along grain boundaries and over free surfaces more rapidly than through the interiors of crystals. In order to facilitate quantitative investigation of grain boundary and surface diffusion, a mathematical analysis of the problem has been completed, assuming that grain boundary dif…
Experimental results are given on the velocity of propagation of a single domain boundary in a crystal of silicon iron with a simple domain structure. In weak applied magnetic fields (\ensuremath{\sim}0.003 oersted) the velocity is given by a relation of the form $v=G(H\ensuremath{-}{H}_{0})$, where $G$ is a constant…
Abstract This paper is concerned with observations on the preparation of phases which may exist in the system CaCO3-H20 in the presence o f ‘additives’, with a qualitative explanation of the appearance of unstable phases under such conditions. It has been found that the tendency for metastable phases of calcium carbon…
Abstract A modification of the colorimetric determination of magnesium by means of Titan yellow, as applied to plant‐ash extracts, is described, in which no preliminary separations are required; the range is from 10 to 80 μg. magnesium.
Abstract The addition of carbon black may cause considerable changes in the physical properties of rubber. Often rubbers compounded with carbon black or other fillers show evidence of thixotropic behavior—their properties depend on the past history of the rubber and may be changed on the one hand by continuous standin…
An attempt has been made to show that the course of cellulose reactions in which the latter's hydroxyl groups are involved is governed by its physical structure (microscopical and sub- microscopical) as well as by the chemical nature of its hydroxyl groups. It would seem that for reasons not yet always clearly underst…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe System Na2O-SiO2-H2O at 50, 70 and 90°*C. L. Baker, L. R. Jue, and J. H. WillsCite this: J. Am. Chem. Soc. 1950, 72, 12, 5369–5382Publication Date (Print):December 1, 1950Publication History Published online1 May 2002Published inissue 1 December 1950https://pubs.acs.org/…
A method is proposed which has been experimentally verified for analyzing porosity‡ data in terms of two dimensionless parameters—the discharge coefficient and Reynolds number—char— acterizing the flow through interyarn pores of a metallic fabric. It is experimentally shown that porosity data for wire screens ranging…
We have applied X-ray diffraction from solutions to the determination of the structures of chloro- and bromoplatinic acids and some complex lower halides of niobium and tantalum. We have interpreted the diffraction photographs by the visual estimation technique which has been used in these laboratories to determine th…
A material satisfying the chemical formula for silicon monoxide can be prepared by heating finely divided silicon and silica in vacuum. Silicon monoxide is structurally different from either silicon or silica and exists only in amorphous form. Vacuum‐deposited thin films of silicon monoxide decompose to silicon and si…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSome Factors Influencing the Activity of Raney Nickel Catalyst. I. Preparation of Raney Nickel from Nickel—Magnesium Alloy1John N. Pattison and Ed. F. DegeringCite this: J. Am. Chem. Soc. 1950, 72, 12, 5756Publication Date (Print):December 1, 1950Publication History Publishe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChlorotrifluoroethylene PolymersW. H. Reysen and J. D. GibsonCite this: Ind. Eng. Chem. 1950, 42, 12, 2468–2471Publication Date (Print):December 1, 1950Publication History Published online1 May 2002Published inissue 1 December 1950https://pubs.acs.org/doi/10.1021/ie50492a025…
The vapor pressure of SrO was measured by studying the product evaporated from platinum filaments coated with SrO. Most of the experiments employed radiactive isotopes.* The possibility of systematic error caused by chemical reduction of the oxide or by its thermal dissociation is discussed. A value of λ0, the heat of…
Fifty-one differential thermal analysis curves are presented and interpreted. These curves are of forty-eight carbonate minerals, one artificial carbonate, one oxide mineral, and one artificial oxide.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Structure on the Rate of Spontaneous Thermal Decomposition of Substituted Benzoyl PeroxidesC. Gardner Swain, Walter H. Stockmayer, and John T. ClarkeCite this: J. Am. Chem. Soc. 1950, 72, 12, 5426–5434Publication Date (Print):December 1, 1950Publication History Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTManufacture and Uses of Ethylene Oxide and Ethylene GlycolP. P. McClellanCite this: Ind. Eng. Chem. 1950, 42, 12, 2402–2407Publication Date (Print):December 1, 1950Publication History Published online1 May 2002Published inissue 1 December 1950https://pubs.acs.org/doi/10.1021…
Decamethylene adipate polymers prepared in the absence of solvent undergo a reversible decrease in solution viscosity when heated for long times in chlorobenzene. This phenomenon is shown to be due to ester interchange reactions which establish equilibrium between ring and chain molecules. Quantitative agreement with…
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