Materials Literature
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Abstract The electronic structure of the valence band of crystalline (α and γ) and amorphous Al 2 O 3 is measured by X‐ray photoemission. No significant changes are found in the different crystalline forms. A broad band observed at about 4 eV below the valence band is associated with the 2s states of the oxygen atoms,…
A study of the redox potentials of a range of metal phthalocyanines in non-aqueous media compared with analogous data for some porphyrin complexes provides evidence for extensive back donation in metallophthalocyanines. The potentials for some couples are exceedingly sensitive to axial ligation. It is suggested that t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrbital interaction in three systemsSatoshi Inagaki, Hiroshi Fujimoto, and Kenichi FukuiCite this: J. Am. Chem. Soc. 1976, 98, 16, 4693–4701Publication Date (Print):August 1, 1976Publication History Published online1 May 2002Published inissue 1 August 1976https://pubs.acs.or…
1. The effects of calcium on the motility of different preparations of flagella from Crithidia oncopelti were studied using stroboscopic and high-speed cine photographic techniques. 2. By varying the concentration of calcium in suspensions of chemically treated samples of the organism it was found that changes occurre…
The surface of Monel‐400 alloy was exposed to high p H, aqueous corrosion at 285°C, under both oxidizing and reducing conditions. After exposures lasting from 0.3 to 335 hr the surfaces were examined by x‐ray photoelectron spectroscopy, scanning electron microscopy, and other techniques. Under reducing conditions, no…
Culture medium of exponentially growing Bordetella pertussis (strain 114) contains significant quantities of soluble (100,000 X g for 1 h) adenylate cyclase. The enzyme was purified by chromatography on diethylaminoethyl-cellulose and Sephadex G-200. The purest material yielded a single band on sodium dodecyl sulfate-…
Abstract Pit initiation at passive iron in borate and phthalate buffer solutions was investigated by separately measuring dissolution rates of Fe(III) and Fe(II) at rotating ring‐dis electrodes. The rate of Fe(III) dissolution grow linearly with the chloride concentration. Fe(II) appears simultaneously with the first…
Using the neutron scattering technique, we have measured the temperature dependences of the characteristic correlation lengths in semidilute polymer solutions in the vicinity of the theta (Θ) point. From the analysis of the data in the Guinier range, with a sample containing a few labeled chains, we find that the radi…
The equation is derived which describes the dynamics of the phase of the charge density wave in the Peierls-Fröhlich state in the presence of the impurity scattering. By use of the correlation function of the phase, the frequency dependence of the electrical conductivity, σ(ω), is calculated at T =0 K for the case of…
The influence of ferrocene on the flammability and smoke generation behavior and thermal characteristics of poly(vinyl chloride) (PVC) and poly(vinyl alcohol) (PVC) was examined in order to understand the basis of ferrocene's activity as a flame-retardant and smoke-suppressant additive. Ferrocene increased char format…
A model has been developed to calculate the heat transfer coefficients from the fuel rods to the steam-droplet mixture typical of Boiling Water Reactors under Emergency Core Cooling System (ECCS) operation conditions during a postulated loss-of-coolant accident. The model includes the heat transfer by convection to th…
Grating-coupled radiation in lasers and waveguides is analyzed for trapezoidal-shaped grating teeth which includes all triangular shapes. A perturbation technique is used which involves calculating the modes in a geometry with an inhomogeneous refractive index profile in the grating region. Curves are presented for ra…
Abstract A IIb orthochlorite (brunsvigite), from the chloritic metabasalt in the Middletown Valley of Maryland, was altered to a regularly interstratified chlorite—vermiculite after four months reaction in saturated bromine water on the steambath. The artificial weathering product resembles the regularly interstratifi…
Fossil glycoproteins of the soluble organic matrix are present in an 80-million-year-old mollusk shell from the Late Cretaceous Period. Discrete molecular weight components, as determined by gel electrophoresis, are preserved. The fossil organic matrix was compared with the organic matrix of a living representative sp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman studies of sulfur-containing anions in inorganic polysulfides. Potassium polysulfidesG. J. Janz, J. W. Coutts, J. R. Downey, and E. RodunerCite this: Inorg. Chem. 1976, 15, 8, 1755–1759Publication Date (Print):August 1, 1976Publication History Published online1 May 200…
We discuss some theoretical features of a nematic phase made of long, partially flexible chains. The bend constant K3 is dominated by the rigidity of the chains. The twist constant K2 is mainly related to the anisotropic couplings between chains. The splay constant is very large (increasing like the square of the mole…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of metal oxide catalysts by temperature programmed desorption. 1. Chemisorption of oxygen on nickel oxideMasakazu Iwamoto, Yukihiro Yoda, Makoto Egashira, and Tetsuro SeiyamaCite this: J. Phys. Chem. 1976, 80, 18, 1989–1994Publication Date (Print):August 1, 1976Publica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman studies of sulfur-containing anions in inorganic polysulfides. Barium trisulfideG. J. Janz, E. Roduner, J. W. Coutts, and J. R. DowneyCite this: Inorg. Chem. 1976, 15, 8, 1751–1754Publication Date (Print):August 1, 1976Publication History Published online1 May 2002Publ…
Conventional measurement techniques for the investigation of the behavior of corona-charged polymer foil electrets allow one to determine the equivalent surface charge and the surface potential decay after termination of the charging process. This paper describes a technique which determines charges, currents, and pot…
The thermal decomposition of low-density polyethylene, isotactic polypropylene, and polyisobutylene has been studied in helium at a heating rate of 20°C/min using an experimental system which consists of a programmable pyrolyzer, a thermal conductivity cell, and a mass chromatograph. For low-density polyethylene, the…