Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Influence of Solvent upon the Compatibility of Polystyrene and Poly(vinyl methyl ether)M. Bank, J. Leffingwell, and C. ThiesCite this: Macromolecules 1971, 4, 1, 43–46Publication Date (Print):January 1, 1971Publication History Published online1 May 2002Published inissue…
Since Eugène Houdry discovered some clays to be excellent catalysts for the “cracking” of heavy oils, the surface properties of silica-alumina combinations have been studied in various places and from various angles. The surface properties of silica-alumina-combinations differ in many ways from those of silica or of a…
It has been found possible to measure reversible electrode potentials for couples containing technetium and one or more of its hydrous oxides. The procedure disclosed the existence, in films, of technetium in 1+, 2+, and 3+ valence states, besides oxides Tc 3 O 4 and Tc 4 O 7 , and provided direct means for evaluating…
Neutron inelastic scattering measurements are reported for six chloroethane samples. Absolute theoretical intensities have been calculated for vibrational inelastic events which are in good agreement with the experimental results. In some cases the calculated intensities show a dependence on the symmetry species of th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFree-radical polymerization of bicyclobutanesThomas D. Swartz and Henry Kingston Hall Jr.Cite this: J. Am. Chem. Soc. 1971, 93, 1, 137–140Publication Date (Print):January 1, 1971Publication History Published online1 May 2002Published inissue 1 January 1971https://pubs.acs.or…
Abstract Several equations containing two empirical constants are considered for representing G(t), G′(ω), J′(ω), and J(t) in the glass‐to‐rubber dispersion zone. With these equations, data on the NBS polyisobutylene can be closely represented. The relaxation spectrum H(τ) and the retardation spectrum L(τ) were derive…
The quenching of the fluorescence of trans-thioindigo and the inhibition of its photoisomerization to the cis-isomer by phenols support the idea that the photostability of indigo is due to a proton-transfer in the excited singlet state.
The recombination coefficient, γ′H and the energy accommodation coefficient, βH were simultaneously determined for hydrogen atom recombination on Ag, Au, Co, Cu, W, Fe, Ni and Pt filaments. Values of βH of 0.87, 0.65 and 0.43 were observed for Ag, Au and Cu, respectively, while values between 0.08 and 0.28 were observ…
Hardness measurements and electron microscopic observations were made to study factors affecting the aging of Mg–Zn alloy and Mg–Zn–(Ag) alloys. In regard to the homogeneous and heterogeneous nucleation in these alloys, direct aging, two-step aging and strain aging were carried out, with the results summarized as foll…
The kinetics for dissolution and deposition of solid aluminum in molten and electrolytes were studied by means of galvanostatic and potentiostatic techniques over a temperature range of 175°–313°C. The apparent exchange current densities varied from 1 to 56 mA/cm 2 . Surface diffusion was found to be the rate‐determin…
Solid‐state reactions of equimolar mixtures of Bi 2 O 3 and Fe 2 O 3 from 625° to 830°C and their kinetics were investigated. The reaction rates were determined from the integrated X‐ray diffraction intensities of the strongest peaks of the reactants and products. The activation energy for the formation of BiFeO 3 was…
A comparative study of the first-row transition metal ions Fe3+ and Mn2+ on the surfaces of aluminas and silicas has been made using the conventional techniques e.s.r., X-ray diffraction, magnetic susceptibility and in addition a relatively new technique phosphorescence spectroscopy.The results indicate that Fe3+ ions…
Aluminum was electrodeposited onto metallic substrates from a number of electrolytes consisting essentially of an solute of commercial purity and technical grade alkyl benzene solvents or solvent mixtures. Bright, fine‐grained, adherent aluminum coatings were obtained at cathode efficiencies of the order of 70–85% and…
Abstract The infrared spectra of the Mg(II), Co(II), Cu(II), Zn(II), Pd(II), Ni(II), and Ge(IV)Cl2 complexes of octaethylporphyrins have been studied over the range 4000–100 cm−1. Metal sensitive bands have been observed at about 980, 920, 340, 230, and 130 cm−1.
Crystals of hexaphenoxycyclotriphosphazene, [NP(OPh)2]3, are monoclinic, a= 11·176(4), b= 19·270(3), c= 16·171 (4)Å, β= 92·07(2)°, Z= 4, space group P21/n. The structure was determined with diffractometer data by Patterson and electron-density methods, and refined by block-diagonal least-squares methods to R 0·037 for…
Abstract
Abstract The wood cell wall is composed of chemically and structurally different components. The cellulose molecules are smooth long chains, able to aggregate in longitudinal direction to compact fibrils. The polyoses consist of shorter chains with side groups and branching points so that they are not able to aggregat…
The preparation of 21-oxa, 21-thia-, 21,23-dioxa-, 21,23-dithia-, and 21-oxa-23-thia-porphins is described. These new porphin analogues have spectral properties similar to those of the porphins, which supports their formulation as aromtic macrocycles. Surprising basicity is displayed by 21,22- and 21,23-dioxaporphins…
Manganese‐activated SrAl 12 O 19 and CaAl 12 O 19 phosphors have been prepared under oxidizing and reducing conditions, and by direct cation exchange. The red emission of oxidized phosphor and green emission of reduced phosphor confirm previous assignments to octahedral Mn 4+ and tetrahedral Mn 2+ , respectively. New…
The ionic conductivity of polycrystalline lithium iodide containing 0 to 3% (mole) calcium iodide was studied at temperatures between −30° and 130°C.The conductivity increased linearly with the concentration of calcium iodide, and it was concluded that the introduction of calcium ions to the lithium iodide crystals in…