Materials Literature
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A study was carried out on the corona discharge rate and energy loss occurring within artificial cavities. An air gap with metallic electrodes was utilized to simulate the ionization sources within a cable. The corona discharge rates, obtained with varying gap spacings under different vapor pressures, showed marked de…
The characteristics of cobalt films of initial purity 99.91% and 99.999% prepared by vacuum evaporation on various substrates were studied. Variables were substrate type (KCl, NaCl, and natural graphite), substrate temperature, vacuum during evaporation, and vacuum cleavage vs cleavage in air. Epitaxial fcc cobalt fil…
Chemistry and physics of the rare earth elements and their compounds are in a rapidly expanding state of development. Many new materials with interesting magnetic properties have recently become available. The potential of lanthanon compounds as magnetic materials in electrical engineering is evaluated by comparing th…
Abstract Vulcanizate properties and processability of ethylene propylene copolymers (EPR) are known to be sensitive to variations in polymer microstructure. A basic understanding of the practical performance of EPR requires a knowledge of this microstructure and means for evaluating it. This study was concerned with d…
Abstract A theory is presented that takes into account the two stages occurring during the crystallization of bulk polymers. The theory assumes that all the crystallization occurs within the spherulites but that the amount of crystallinity at any particular point within a spherulite depends upon the age of that partic…
Abstract A detailed study has been made of the swelling of vulcanizates containing “adhering” and “non-adhering” fillers. The restriction of the swelling of vulcanizates containing “adhering” fillers compared to the swelling of the corresponding pure gum vulcanizate does not take place in solvents with solvent power b…
Dezincification occurs by dissolution of both zinc and copper, followed by redeposition of copper from the oxygen-free cuprous chloride/zinc chloride anolyte. Deposition of copper from such a solution by reduction of Cu+ requires a potentIal below −0·41 V but Cu2+, formed by disproportionation of cuprous chloride, can…
A rotating x-ray camera is described which yields lattice constants of single crystals with a possible error of 0.00007 kX. Measurements of expansion may be made with a precision of 0.00002 kX. The design of the camera permits accurate specimen alignment at any specimen temperature and requires that few corrections be…
Abstract In the present paper our previous results and Manley's results for single crystals of amylose V complexes are confirmed. A reasonable interpretation of electron diffraction patterns from lamellar crystals of the monohydrated complex and of the anhydrous complex is presented. It is concluded that the longer si…
Absorption and emission spectra and mean lifetimes (τm) of the luminescence of tris(2,2′-bipyridine)- and tris(1,10-phenanthroline)ruthenium(II) are reported. For the 2,2′-bipyridine complex, two weak absorption bands occurring at 15 050 and 18 550 cm−1 are assigned, respectively, to the 1A1→3T1 and 1A1→1T1 transition…
Adhesion studies on spherical particles imbedded in elastomers have shown that cohesive failure of the binder phase always precedes dewetting. The latter is a sudden and irreversible process resulting in permanent damage to the system. Cohesive failure manifests itself in the formation of a number of small holes near…
The spatial distribution of magnetic moment disturbance around fifteen different transition metal impurities in iron (Ti, V, Cr, Mn, Co, Ni, Mo, Ru, Rh, Pd, W, Re, Os, Ir and Pt) and around four such impurities in nickel (V, Cr, Mn and Fe) has been investigated. A neutron scattering technique was employed that gives i…
A description is given of investigations concerning the participation of ammonium nitrate in the formation of HMX and RDX by the nitrolysis of hexamethylene tetramine.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman Spectra of Crystalline ChlorothallatesThomas G. SpiroCite this: Inorg. Chem. 1965, 4, 9, 1290–1293Publication Date (Print):September 1, 1965Publication History Published online1 May 2002Published inissue 1 September 1965https://pubs.acs.org/doi/10.1021/ic50031a013https…
Abstract This paper contains a description of the use of gas chromatography to examine the pyrolytic degradation of epoxide resins. The method depends on the pyrolysis of the material by use of an electrically heated filament, the difficulties of the method are examined and attempts to overcome them are described. The…
Common failure modes of aluminum electrolytic capacitors are due to chemical reactions between electrodes and electrolyte. From capacitance and weight change data and electron micrographs it is proposed that the attack of anode foil is primarily dissolution of oxide dielectric; that of cathode foil involves metal diss…
Anodic polarization behavior of annealed high-purity Ni, Cr and selected Ni-Cr alloys in hydrogen-saturated, 1, 5, 10 and 20N sulfuric acid solutions was investigated at 25 ± 1 C (77 F) using a potentiostatic technique. All specimens except pure Ni in 20N acid had an active-to-passive transition. Decreasing acid conce…
A quantitative survey has been carried out of the sizes and densities of the defects found by transmission electron microscopy of irradiated graphite crystals. Three regimes are considered, viz. isothermal irradiations between 150° and 1200°c, seeding irradiations in which the crystals have been given a short pre-irra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectra of Molecular Complexes of Porphyrins in Aqueous Solution*D. MauzerallCite this: Biochemistry 1965, 4, 9, 1801–1810Publication Date (Print):September 1, 1965Publication History Published online1 May 2002Published inissue 1 September 1965https://pubs.acs.org/doi/10.102…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochromic Chelating AgentsJ. P. Phillips, A. Mueller, and F. PrzystalCite this: J. Am. Chem. Soc. 1965, 87, 17, 4020Publication Date (Print):September 1, 1965Publication History Published online1 May 2002Published inissue 1 September 1965https://pubs.acs.org/doi/10.1021/j…