Materials Literature
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Abstract Observations on the x‐ray scattering by ball‐milled cellulose and cellulose derivatives, amorphous oligosaccharides, and Fortisan H are reported and an approximate shape is established for the scattering curve of the noncrystalline component of celluloses. Using this shape measurements have been made of the m…
Abstract Mineralogical and chemical properties of Madison soil derived from quartz mica schist reflected the degree of weathering. The Madison soil had sandy surface horizons and clayey B horizons. The clay in surface horizons contained more mica than clay in the subsoils; a maximum of about 40 per cent mica in the co…
Abstract Dehydration and recrystallization reactions of fine and coarse powders and also of massive samples of serpentine under isothermal heating conditions in air are followed by thermobalance measurements and by X-ray diffraction intensities. The rate of recrystallization to forsterite is shown to have an inverse r…
Abstract High-alumina minerals refer, in this paper, to Al-rich, normal sedimentary phases, including gibbsite, boehmite, diaspore, possibly “proto-diaspore” and “proto-alunite”, “Al-chlorite”, and corundum, in association with kaolin minerals. They may be derived from any common Al-containing rock. Processes of origi…
Abstract As an approach to reviewing the surface properties of alumino-silicates, this paper considers the relationships between constitution hydroxyls, surface hydroxyls, chemisorbed and physically adsorbed water molecules and exchangeable cations. One of the main characteristics of clay minerals is, indeed, the deve…
The stability of the vitreous state in the lithium metasilicate region of the system Li 2 O–Al 2 O 3 –SiO 2 was found to be a function of the concentration of lithia. The higher the lithia content, the less stable was the glass. The devitrification of glasses in this system was studied. In addition to the phases prese…
The Green function for an infinite medium with strong small-scale fluctuations of the refractive index is determined. The solution is derived in manner similar to the renormalization method in field theory. An expression for the effective refractive index of the medium and attenuation coefficient is deduced. (auth)
Abstract A study has been made of the effect of concentration of the crosslinking agent, gelatin concentration, and pH on the rate of increase of viscosity with time, for gelatin solutions containing either formaldehyde or glyoxal. The results are consistent with the kinetic relationship: For formaldehyde, n is 2. For…
Abstract Poly‐ L ‐proline in the molecular weight range 50,000–90,000 has been synthesized from L ‐proline‐ N ‐carboxyanhydride. The molecular weight obtained is dependent on the initiator concentration. The rate constants for the polymerization have been determined by measuring the CO 2 evolution. By observation of r…
The specificity of K adsorption on illite with respect to divalent cations can be explained by accepting the existence of three types of exchange sites, each of which shows a normal exchange process which may be described with the Gapon exchange equation. The K exchange on illite can be described mathematically as the…
This discussion of a few preliminary experiments with nickel points out some of the potential uses of low energy electron diffraction in improving our understanding of many types of surface phenomena. The first, and probably the most basic use, is in the study of clean surfaces. As illustrated in this article, the phy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLigand Field Theory of Transition Metal Cyanide Complexes. Part I. The Zero, One and Two Electron or Hole ConfigurationsJ. R. Perumareddi, Andrew D. Liehr, and Arthur W. AdamsonCite this: J. Am. Chem. Soc. 1963, 85, 3, 249–259Publication Date (Print):February 1, 1963Publicat…
Smooth bore cannons were used to produce plane collisions between plates of Armco iron. Projectile velocities ranged from 60 to 400 m/sec. Time resolved measurements of the target free-surface velocities indicate that the dynamic yielding process is time dependent on a submicrosecond time scale. The shape of the Hugon…
Recent developments in the synthesis of hexanitroethane (HNE) have renewed interest in its use as a possible high energy oxidizer. The chemical reactivity and the physical properties of hexanitroethane have been extensively studied and are presented in this report. Hexanitroethane is a solid, high energy oxidant, melt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of Silane. I. Preparation of SilaneH. L. Jackson, F. D. Marsh, and E. L. MuettertiesCite this: Inorg. Chem. 1963, 2, 1, 43–46Publication Date (Print):February 1, 1963Publication History Published online1 May 2002Published inissue 1 February 1963https://pubs.acs.org…
Abstract Five illitic clays were treated with various inorganic cations and heated to over 1400°C in a high-temperature X-ray diffraction furnace. The illite lattice undergoes dehydroxylation from 475–600°C, and the resulting anhydrides begin to disappear at 850°C. The major high-temperature phases formed from untreat…
1. When Merinos of varying wool lengths were exposed at constant air temperature of 36° C. ( c. 97° F.) to infra-red radiation of energy equivalent to that which they might receive from the sun, the following responses were noted: ( a ) A very highly significant ( P < 0·001) inverse relationship between respiration…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic Susceptibilities and Dilution Effects in Low-Spin d4 Complexes: Osmium(IV)Rolf B. Johannesen and George A. CandelaCite this: Inorg. Chem. 1963, 2, 1, 67–72Publication Date (Print):February 1, 1963Publication History Published online1 May 2002Published inissue 1 Febr…
Abstract The x‐ray diffraction patterns of nylon 66 at small and large angles have been correlated with the densities of samples prepared in various ways. Quenching from the melt to 0°C. produces structures which are less than 40% crystalline, as determined by density and have structures similar to nematic liquid crys…
Abstract A substantially homogeneous mineral fraction from a Katy soil profile in Fort Bend County, Texas, consists of a tabular kaolin group mineral with the physical and chemical properties characteristic of a nearly dehydrated halloysite, retaining only a small excess of water.