Materials Literature
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The crystal structure of the C form of stearic acid has been determined from X-ray powder diffraction patterns, The crystals are monoclinic, space group P21/a, with unit-cell dimensions: a= 9·36, b= 4·95, c= 50·7 Å. β= 128 °15′ and Z= 4. The crystal structure has been determined by trial-and-error methods to R 0·086.…
Previous investigations on Cu ‐ Au and Cu ‐ Zn alloys have shown that the polarization curves for anodic dissolution of the less noble metal are complex, that the mechanism of preferential anodic dissolution involves the interdiffusion of the components in an alloy layer next to the surface, and that appreciable surfa…
A numerical calculation is described which determines the blocking radius of a pile-up of negative edge dislocations to a group of either negative or positive edge dislocations with the same Burgers vector. The results are used to calculate the work-hardening rate in stage II of face-centred-cubic single crystals in t…
Spectra of the alkali metal intercalation products of MoS2 and NbSc2 arc interpreted in terms of a previously published band model.
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…
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 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…
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.…
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…
Abstract not Available.
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…
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…