Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-diffusion of Cations in and through Sulfonated Polystyrene Cation-exchange Polymers1G. E. Boyd and B. A. SoldanoCite this: J. Am. Chem. Soc. 1953, 75, 24, 6091–6099Publication Date (Print):December 1, 1953Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Molecular Structure of Polyethylene. I. Chain Branching in Polyethylene during Polymerization1M. J. RoedelCite this: J. Am. Chem. Soc. 1953, 75, 24, 6110–6112Publication Date (Print):December 1, 1953Publication History Published online1 May 2002Published inissue 1 Decemb…
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There exist two types of sediment load, one that bears a certain relationship with the discharge (bed‐material load), and the other which does not (wash load). The result of flume study indicates that the transport rate of wash load, just as that of the bed‐material load, can be calculated according to the Einstein be…
The theory of the influence on angular correlations of perturbing interactions in the intermediate state is reformulated to allow the description of the effects of time-dependent as well as of static perturbations. For static interactions of the nuclear electric quadrupole moment with crystalline fields of axial symme…
An electron-diffraction study of the oxide films formed by heating aluminium foil in air on metal grid supports has revealed the occurrence of a number of new phases arbitrarily designated the h,/~, v, ~ and ~' phases. Except for the h-phase, all these phases may be indexed in terms of hexagonal unit cells with a ~ 5…
Abstract The thermal conductivity of a type I diamond has been measured between 2° K and room temperature. Above 100° K the temperature variation of conductivity accords with Peierls’s theory of Umklapp processes. To account for the results at the lowest temperatures it is necessary to assume that some specular reflex…
Calciumaluminiumhydrid wird durch Umsetzung von Aluminiumchlorid und Calciumhydrid in Tetrahydrofuran dargestellt. Das aus der Losung gewonnene Festprodukt enthalt auch in trockenem Zustand noch 40—50% Tetrahydrofuran und ist in seinen Eigenschaften dem Lithiumaluminiumhydrid weitgehend ähnlich.
A quantitative technique has been developed in which a weighed sample of cotton fiber is swollen in sodium hydroxide, centrifuged to remove liquid from between the fibers, and re weighed to determine its percentage increase in weight, the latter quantity being designated here as the fiber's "alkali-centrifuge value."…
The infrared spectrum of single crystals of brucite [Mg(OH)2] has been examined under high resolving power between 2 and 3μ. It contains at least 16 bands most of which are shown to be OH stretching frequencies and which exhibit a variety of polarization properties. It follows that the unit cell of brucite must be muc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Stability Constants of Cadmium Chloride Complexes: Variation with Temperature and Ionic Strength1Cecil E. Vanderzee and Harold J. Dawson Jr.Cite this: J. Am. Chem. Soc. 1953, 75, 22, 5659–5663Publication Date (Print):November 1, 1953Publication History Published online1…
Abstract In this article a conception of the mechanism of crystallization is given, on the basis of which, it is suggested the origin of spherulites might be explained. A tentative explanation of several related phenomena is based on the new concept. Crystallites are conceived to be small collections of strongly orien…
The annealing of isolated interstitial-vacancy pairs presumably introduced by bombardment is considered theoretically with special attention paid to the diamond-type lattice. It is proposed that the annealing can be divided into three stages. First, those vacancy-interstitial pairs having a small initial separation wi…
On the assumption that the energy per unit length of a dislocation line is proportional to the square of the Burgers vector, the stability of dislocations in simple cubic, face-centred cubic, diamond, hexagonal close-packed, and body-centred cubic lattices is discussed. It is shown that in each of these lattices, ther…
An experimental investigation of the concentration field during crystallization is made using an improved modification of W. F. Berg's interference technique. Na2S2O3·5H2O is crystallized at 23°C; concentrations between 40 percent and 55 percent. Graphing the positions of the growing faces versus time indicates, in al…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Crystal Structure of Samarium Metal and of Samarium Monoxide1F. H. Ellinger and W. H. ZachariasenCite this: J. Am. Chem. Soc. 1953, 75, 22, 5650–5652Publication Date (Print):November 1, 1953Publication History Published online1 May 2002Published inissue 1 November 1953ht…