Optical studies of metal-semiconductor transmutations produced by intercalation
Spectra of the alkali metal intercalation products of MoS2 and NbSc2 arc interpreted in terms of a previously published band model.
Materials Literature
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The Use of a Chrome Alum-Gelatin (Subbing) Solution as a General Adhesive for Paraffin Sections
The adhesion obtained from a chrome alum-gelatin solution has been found far superior to results given by widely used general adhesives (Haupt's gelatin and Mayer's egg albumen) for paraffin sections. The subbing solution, which consists of 5.0 gin gelatin and 0.5 gm chrome alum per liter of water, is easier to apply…
Reaction intermediates in methyl alcohol decomposition on ZnO
The decomposition of methyl alcohol on ZnO was studied using infra-red spectroscopy during the course of the reaction. The concentrations and reactivities of the chemisorbed and gas phase species were measured as well as the overall reaction rate under various non-stationary conditions. When CD3OD vapour was introduce…
Selective Etching of Gallium Arsenide Crystals in H[sub 2]SO[sub 4]-H[sub 2]O[sub 2]-H[sub 2]O System
Selective etching of GaAs in the H 2 SO 4 ‐ H 2 O 2 ‐ H 2 O system was studied as a pretreatment to selective deposition. Flat‐bottomed holes were obtained in low H 2 SO 4 solutions, whereas nonplanar holes were obtained in high H 2 SO 4 solutions. Differences between both cases are considered from the etching behavio…
Macrocyclic polyether sulfides
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMacrocyclic polyether sulfidesCharles J. PedersenCite this: J. Org. Chem. 1971, 36, 2, 254–257Publication Date (Print):January 1, 1971Publication History Published online1 May 2002Published inissue 1 January 1971https://pubs.acs.org/doi/10.1021/jo00801a003https://doi.org/10.…
A molecular field treatment of liquid crystalline mixtures
The Maier-Saupe theory of the nematic mesophase is extended to multicomponent systems containing axially symmetric molecules interacting with a general anisotropic intermolecular potential. Expressions are derived for the anisotropic pseudo-potential of each component as well as the orientational molar Helmholtz funct…
The Use of Metal-Organics in the Preparation of Semiconductor Materials
Abstract not Available.
Cathodoluminescence of CaS:Ce[sup 3+] and CaS:Eu[sup 2+] Phosphors
Data are presented on green‐emitting CaS : Ce 3 + , red‐emitting CaS : Eu 2 + , and doubly activated CaS : Eu 2 + , Ce 3 + , including spectra, efficiency, and decay characteristics. Green CaS : Ce 3 + rivals the best green ZnS‐type phosphors in efficiency, color, and brightness at low beam current and is appreciably…
The Influence of Solvent upon the Compatibility of Polystyrene and Poly(vinyl methyl ether)
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…
Constitution and properties of silica-alumina-catalysts
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…
Free Energies of Formation of Hydrous Oxides of Technetium in Its Lower Valencies
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…
A neutron inelastic scattering study of the chloroethanes
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…
Free-radical polymerization of bicyclobutanes
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…
Empirical equations for representing viscoelastic functions and for deriving spectra
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 interaction of excited thioindigo with hydroxylic compounds and its implications on the photostability of indigo
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.
Energy accommodation during hydrogen atom recombination on metal surfaces
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…
The Main Factors Affecting the Aging of Magnesium-Zinc Alloys
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…
Electrochemical Behavior of the Aluminum Electrode in Molten Salt Electrolytes
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…
Kinetics of Solid‐State Reaction of Bi 2 O 3 and Fe 2 O 3
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…
Spectroscopic study of the coordination and valence of Fe and Mn ions in and on the surface of aluminas and silicas
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…