Materials Literature
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The overall characteristics of the composites cured with a number of newly synthesized, tertiary aromatic amines compare favorably to those of resins polymerized with commonly used accelerators. Maximum compressive and tensile strength for the composites are obtained only over a narrow concentration range of accelerat…
The developing velocities of the positive and negative corona streamers on insulating plates have been measured by using the dust figure technique at low pressure in air. By applying nanosecond time pulses from 10- to 50-nsec duration to a needle point where the insulating plate is sandwiched in between the needle and…
Abstract Mössbauer spectra of 9 glauconite samples from Upper Cretaceous and Lower Tertiary strata in the South Island of New Zealand contain a broad shoulder due to low intensity absorption continuous between 1.0 and 2.5 mm/sec when the absorber is at room temperature; the shoulder is absent, and sharp peaks are appa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic ground-state properties of tetranuclear hexa-.mu.-hydroxo-bis(tetraamminechromium(III))bis(diamminechromium(III)) chloride. A spectroscopic and magnetochemical studyHans U. Guedel, Urs Hauser, and Albert FurrerCite this: Inorg. Chem. 1979, 18, 10, 2730–2737Publica…
Abstract The charge density distribution among different classes of a series of reduced charge mont-morillonites is heterogeneous as in the parent Camp Berteau clay. In addition, charge reduction proceeds inhomogeneously. Up to 20% differences in charge density can be accounted for by aikyl chains extending at the edg…
High-resolution transmission electron microscopy using axial beam illumination was carried out on vacuum-deposited WO 3 , TiO 2 , and MoO 3 films. In as-deposited WO 3 films thinner than 100 Å and films heated at 350°C for 2∼5 h which gave rise to amorphous haloes in electron diffraction, crossed fringe-like structure…
Abstract The dielectric spectra of BaTiO 3 single‐domain and polydomain tetragonal crystals with 180° domain structure are investigated over the wide range of frequencies 10 3 to 10 10 Hz. It is shown that the dielectric permittivity ε 33 of the single‐domain crystals has three regions of dispersion including two regi…
Pedogenic palygorskite is formed in oases soils in the eastern province of Alhasa. The pedogenesis of palygorskite is indicated by the fact that this clay mineral could not be detected in an ancient red bed (Miocene or Pliocene) believed to be the soil parent material. This pedogenic palygorskite is forming at the exp…
The corrosion of metals in the aqueous environments of body fluids involves the setting up of electrochemical corrosion cells. The corrosion produced by these cells is controlled by thermodynamic and kinetic factors. The thermodynamic factors determine the corrosion tendencies; the kinetic factors determine the rate.…
Abstract The grafting of methyl methacrylate (MMA) onto chitin initiated by tributylborane (TBB) was investigated at ordinary temperature. It was found that water was essential to the grafting. No grafting was observed in the usual organic solvents such as n ‐hexane, tetrahydrofuran, and cyclohexanone. The total conve…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh- and low-spin interconversion in a series of (.alpha.-picolylamine)iron(II) complexesAnthony M. Greenaway, Charles J. O'Connor, Alan Schrock, and Ekk SinnCite this: Inorg. Chem. 1979, 18, 10, 2692–2695Publication Date (Print):October 1, 1979Publication History Published…
Abstract Recent gravimetric studies of the sorption of organic vapors by poly(vinyl chloride) and polystyrene powders have demonstrated several features which promise to be generally useful in studying the structure and properties of the glassy state. The uptake of vapor can be significantly altered by prior thermal o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA novel total synthesis of (2R,4'R,8'R)-.alpha.-tocopherol (vitamin E). Construction of chiral chromans from an optically active, nonaromatic precursorNoal Cohen, Rocco J. Lopresti, and Gabriel SaucyCite this: J. Am. Chem. Soc. 1979, 101, 22, 6710–6716Publication Date (Print…
Magnetic susceptibility data for several Fe(II) coordination polymers containing oxalate or squarate dianions are reported in the temperature range 4.2-300 K. Low temperature magnetism of Fe(C2O4)(H2O)2 is dominated by intrachain ordering near 32 K followed by the onset of interchain long-range order slightly below th…
We consider the electrical resistivity due to the two-level systems which have been detected recently by ultrasonic saturation experiments. Using model parameters consistent with these experiments, we calculate a temperature-dependent resistivity. It is found that the scattering mechanism is too weak by at least three…
Electrolytic charging of austenitic stainless steels with hydrogen induces formation of two distinct alloy hydride phases, both being unstable under normal atmospheric conditions. One of the new phases denoted Hγ, has the same Bravais lattice as austenite (fcc), whereas another, denoted Hϵ, exhibits an hcp structure.…
Abstract Type I collagen fibrillogenesis in vitro has been studied by laser light scattering, and the results indicate that initiation of aggregation involves at least two steps. Step I of aggregation involves no change in the intensity of scattered light at an angle of 90° and is accompanied by a decrease in the diff…
The entrance and exit regions of 127 degrees cylindrical or 180 degrees spherical electron spectrometers with real apertures are approximated by a shielded parallel plate capacitor. By employing a resistor network, the fringing field resulting from a new arrangement of shielding electrodes is measured. It is shown tha…
The anodic behavior of 99.99% aluminum in nitrate and nitrate‐chloride solutions was examined over a wide range of concentrations. In solutions containing an excess of nitrate ions, the existence of an unusually high passive current was observed. The magnitude of this current was strongly affected by some kinetic fact…
An experimental program was conducted to determine the feasibility of reducing the chromium content in the widely used commercial Type 304 stainless steel and still maintain comparable corrosion resistance. Potentiodynamic anodic polarization characteristics in 1N H2SO4 and NaCl solutions were selected as the prime cr…