Materials Literature
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Abstract Stable organomineral derivatives are formed by reaction of organochlorosilanes with certain phyllosilicates. Organosiloxyl functions are grafted on silanol groups present at external mineral surfaces. Water molecules adsorbed on external mineral surfaces may cause hydrolysis of the reactant organosilicon prod…
The formation and removal of steady‐state oxide films on nickel elecrodes anodized in Na 2 SO 4 solutions of p H 8.4–2.0 have been examined. Surface activity measurements showed that complete removal of all of these oxide films was possible in solutions of p H ≤ 2.8 with moderate cathodic treatments. Instability of th…
Abstract The degradation of films containing both PS and PVC has been examined by TVA and TG. Stabilization of both polymers, more notably PS, is observed, but the degradation products are the same as when the polymers are degraded alone. Molecular weight measurements indicate a more rapid decrease in the molecular we…
A gas permeability apparatus has been constructed to facilitate the study of permeation of mixtures of gases and vapors. The apparatus utilizes the carrier gas method with gas-chromatographic analysis to determine individual permeation values and in-line thermal conductivity detectors to provide simultaneous overall d…
The energies of the 2p1/2, 2p3/2, 3s, 3p1/2, 3p3/2, and 3d3/2,5/2 photopeaks and of the L2,3M4,5M4,5 Auger peaks have been measured for arsenic metal and 19 of its compounds. By comparing the photopeak and Auger chemical shifts, the changes in the total (static) relaxation energies were determined. It was found that t…
The distribution of the actinides and the composition of metallic fission-product inclusions and oxide inclusions in a mixed-nitride fuel irradiated to 1.29% FIMA in a fast flux has been investigated using an electronprobe microanalyser. Plutonium enrichment was found at open and healed cracks, and a significant decre…
A method with few inherent errors was developed for the determination of cation-exchange capacity of calcareous soils. In this method calcium was used as index cation and the excess salt removal step was omitted. In addition to this a direct way is proposed for the determination of exchangeable calcium plus magnesium…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of endothermic decomposition reactions. I. Steady-state chemical stepsAlan W. Searcy and Dario BerutoCite this: J. Phys. Chem. 1976, 80, 4, 425–429Publication Date (Print):February 1, 1976Publication History Published online1 May 2002Published inissue 1 February 197…
For studying the electron scattering by acoustic phonons and stacking faults, the electrical resistivity of graphite is calculated. Main results of the present calculation are as follows: The acoustic phonon scattering gives rise to the ratio of resistivity ρ c /ρ a ∼10 2 , where ρ c indicates the c -axis resistivity…
A nondestructive tracer-scanning technique was devised to study lateral self-diffusion and electromigration in evaporated thin Sn films. The diffusional spreading and migration of tracer distributions of Sn119m in thin Sn film matrices was recorded over a temperature range 142–213 °C. Determination of the profile shap…
The energy resolution and transit time spread of the 180 degrees hemispherical electrostatic analyser for nonrelativistic electrons or ions have been computed. The results have been expressed in terms of the dimensions of the analyser and the parameters describing the input particle beam for a large range of possible…
Abstract The Flory interaction parameter χ 1 of poly(vinyl alcohol)‐water systems has been estimated as a function of temperature and volume fraction of PVA, the polymer having been crosslinked from solutions of the same in water. Values are reported for temperatures between 0°C and 90°C and polymer volume fractions b…
Human tumors of a variety of histopathologic types have been established in tissue culture. The surface features of these cell lines were investigated by scanning electron microscopy (SEM) with the use of new techniques for specimen preparation. Tumor cells demonstrated striking degrees of surface activity with numero…
The applicability of equilibrium relationships to the mobility of Al and Si in open systems (soil columns) was examined in nine soils representing six soil orders. Gibbsite, halloysite, kaolinite, and montmorillonite appeared to control the solubility of Al and Si. X-ray diffraction measurements confirmed their presen…
ZnS: MnF 2 phosphors and their references were investigated with X-ray photoelectron spectroscopy. The atomic ratio of F to Mn in ZnS: MnF 2 was found to be remarkably lower than that in MnF 2 film. The binding energy of Mn2p 3/2 in ZnS: MnF 2 is near that in β-MnS and ZnS doped with Mn atoms by heat-treatment. It is…
The discharge behavior of thermogalvanic cells based on a dissolved redox couple, namely ferro‐ferricyanide, was investigated as a function of redox couple concentration, temperature difference, electrode placement and configuration, and forced convection. The principal source of cell polarization was found to be the…
A CVD process for the preparation of transparent conducting layers of antimony‐doped tin oxide has been developed utilizing dibutyl tin diacetate, antimony pentachloride, O 2 , H 2 O , and N 2 as carrier gas at a substrate temperature of 400°–550°C. It was designed to fulfill a need for more highly conducting coatings…
The trapping of hydrogen in niobium by nitrogen interstitials was investigated by resistance measurements. The results showed that only about one hydrogen atom can be trapped per nitrogen interstitial at low temperatures and that the trapping enthalpy is 0.12+or-0.02 eV. Due to the trapping process the hydrogen-induce…
Abstract A study has been carried out of the differences in mechanical properties of oriented fibers of poly(ethylene terephthalate) (2GT), poly(trimethylene terephthalate) (3GT), and poly(tetramethylene terephthalate) (4GT). The properties studied include the tensile stress–strain behavior, the recovery from strain,…
An investigation of the behavior of protoporphyrin IX, deuteroporphyrin IX, haematoporphyrin IX and coproporphyrin III in aqueous solution revealed extensive and complex aggregation processes. Protoporphyrin appears to be highly aggregated under all conditions studied. At concentrations below 4 muM, aggregation of deu…