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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.
The phase relations of the system Na(Nb 1- x Ta x )O 3 in the solid state are studied by means of the dielectric constant measurements, x-ray diffraction studies and optical observations. The transition point vs. composition curve of this system exhibits a discontinuity in 0.55> x >0.54. The solid solutions with the c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystalline MethylsilsesquioxanesLester H. Vogt Jr. and John F. Brown Jr.Cite this: Inorg. Chem. 1963, 2, 1, 189–192Publication Date (Print):February 1, 1963Publication History Published online1 May 2002Published inissue 1 February 1963https://pubs.acs.org/doi/10.1021/ic5000…
By a combination of solid‐state sintering and quenching experiments the validity of calcium hexaluminate as a stable phase and the extent of its primary field in the system CaO–Al 2 O 3 –SiO 2 have been established. The size of the primary field is considerably reduced from that suggested by earlier work. The anorthit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHERMOPHYSICAL PROPERTIES OF THE LANTHANIDE OXIDES. II. HEAT CAPACITIES, THERMODYNAMIC PROPERTIES, AND SOME ENERGY LEVELS OF SAMARIUM(III), GADOLINIUM(III), AND YTTERBIUM(III) OXIDES FROM 10 TO 350°K.1Bruce H. Justice and Edgar F. Westrum Jr.Cite this: J. Phys. Chem. 1963, 6…
The DTG curves for the dehydration of a number of preparations of Mg(OH) 2 were determined. Equations necessary to calculate energies of activation and rate constants from these curves were derived on the basis of a two-thirds-order process for dehydration. It was found that the energy of activation was about 5 kcal g…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Molecular and Crystal Structures of π-Cyclopentadienyl π-Cycloheptatrienyl VanadiumGordon. Engebretson and R. E. RundleCite this: J. Am. Chem. Soc. 1963, 85, 4, 481–482Publication Date (Print):February 1, 1963Publication History Published online1 May 2002Published inissu…
Abstract The three‐dimensional morphology of solution‐crystallized low pressure polyethylene has been examined for concentrations to 50% in xylene. Lamellar crystallization is characteristic of the whole range, and whenever diffraction examination has been possible, the lamellae have been shown to contain chain‐folded…