Materials Literature
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Structural relaxations, molecular-dynamics simulations, and lattice-dynamics calculations were performed to study the phase transitions in ${\mathrm{Rb}}_{2}$${\mathrm{ZnCl}}_{4}$, using intermolecular and intramolecular potentials generated from ab initio quantum-chemistry calculations for the whole molecular ion ${\…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal-thiolate bonding properties: single-crystal ESR, susceptibility, and polarized absorption evidence for a strong .pi. interaction in tetrakis(thiophenolato)cobaltate(II)Kouichi Fukui, Norimichi Kojima, Hiroaki Ohya-Nishiguchi, and Noboru HirotaCite this: Inorg. Chem. 19…
In order to compare the fates of end-chain-radiolabelled and repeat-unit-radiolabelled poly(β-malic acid)s after intravenous injection in mice, repeat-unit 14 C-radiolabelling of this biodegradable water-soluble poly carboxylic acid polymer was achieved starting from 14 C-aspartic acid. The ac tivity of the resulting…
For pt.I see ibid., vol.7, no.2, p.596-602 (1992). Preliminary results are described in which 15 kV XLPE cables were subjected to accelerated aging tests under a variety of controlled voltage stress and thermal load cycle conditions, with loss of life being calculated for each set of conditions in terms of the geometr…
Many of the methods for measuring beer foam are based on measurements of the weight or volume of beer collapsed from foam rather than on measurements of the foam itself. However, these drainage methods may not reflect the consumer's perception of foam collapse. Therefore, a method to characterize numerous properties o…
The control of the microstructure of Ce‐doped Al 2 O 3 /ZrO 2 componsites by the valence change of cerium ion has been demonstrated. Two distinctively different types of microstructure, large Al 2 O 3 grains with intragranular ZrO 2 particles and small Al 2 O 3 grains with intergranular ZrO 2 particles, can be obtaine…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExciplex formation between pyrene derivatives and N,N-dimethylaniline in Aerosol OT reversed micellesClaudio D. Borsarelli, Juan J. Cosa, and Carlos M. PrevitaliCite this: Langmuir 1992, 8, 4, 1070–1075Publication Date (Print):April 1, 1992Publication History Published onlin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLithium-transition metal complexes derived from meso-octaethylporphyrinogen which display .sigma.- and .pi.-bonding modesJayne Jubb, Denis Jacoby, Carlo Floriani, Angiola Chiesi-Villa, and Corrado RizzoliCite this: Inorg. Chem. 1992, 31, 7, 1306–1308Publication Date (Print):…
1-Methyluracil (1-methyl-2,4-dioxopyrimidine), C5H6-N2O2, M(r) = 126.12, orthorhombic, Ibam, a = 13.188 (6), b = 13.175 (5), c = 6.214 (3) A, V = 1079.7 (8) A3, Z = 8, Dx = 1.552 g cm-3, lambda (Mo K alpha) = 0.7107 A, mu = 1.317 cm-1, F(000) = 528, T = 123 K, R(F2) = 0.068 for 2996 reflections with sin theta/lambda l…
Experimental and theoretical studies are reported on the room temperature capacitance-voltage (CV) and (tan delta )-V response of a high-voltage barium titanate ceramic disc capacitor with prescribed nonlinear CV response, as fabricated for an intended power electronics application. The CV response was modeled in term…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInitiation of vinyl ether polymerization by trimethylsilyl triflate, dimethyl sulfide, and adventitious waterChang Gi Cho, Ben Ami Feit, and Owen W. WebsterCite this: Macromolecules 1992, 25, 8, 2081–2085Publication Date (Print):April 1, 1992Publication History Published onl…
Simulations of the temperature dependence of the nematic orientational order parameter, [Pbar] 2, at different densities have been made using the Gay-Berne potential. The results are used to calculate Γ = −(∂In T/∂ IN V) [Pbar] 2, which is a measure of the relative sensitivity of [Pbar] 2 to temperature and density. P…
Hard carbon coatings with diamond-like properties were applied on AISI M-50 steel rods which were subjected to rolling contact fatigue (RCF) testing at a cyclic Hertzian stress level of 5.5 GPa. The coatings were produced using a single, broad beam ion source that directed 450 eV ions, derived from a methane discharge…
Abstract Boron adsorption at constant ionic strength [0.09 ± 0.01 moles/liter of KClO 4 or Ca(ClO 4 ) 2 ] on 0.2−2 μ m clay fraction of pretreated kaolinite was modeled using both phenomenological equations and surface complexation reactions. Phenomenological equations were expressed as linear relationships between th…
Nickel was modified at the surface from dilute acid solution containing different concentrations of , , or . It was shown that improvement in the over potential (η)) and in the exchange current density of the hydrogen evolution reaction (HER) in 3 M on the electrode depends on the nature of the heteropolyacid of the m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSimultaneous EPR and electrochemical measurements on polyaniline in ambient temperature molten saltsJ. Tang, R. D. Allendoerfer, and R. A. OsteryoungCite this: J. Phys. Chem. 1992, 96, 8, 3531–3536Publication Date (Print):April 1, 1992Publication History Published online1 Ma…
Ag 1 − x [ ( Y 2 O 3 ) 0.1 ( ZrO 2 ) 0.9 ] x (YSZ) cermet thin films have been deposited by reactive magnetron cosputtering from Ag and Zr/Y targets in Ar ‐ O 2 mixtures. The deposition conditions were such that the YSZ component in the films was fully oxidized. The film densities varied from ≈75% to >85% as the total…
Experimental evidence is provided to show that irreversible aging which leads to electrical treeing in polymeric insulation such as low-density and crosslinked polyethylene used in HV transmission cables, does not start at local fields between 5 and 20 kV/mm. It is shown that a much higher stress is required for elect…
Abstract The title compound (DPP) is a new red pigment based on the diketopyrrolopyrrole chromophore. The evaporated film of DPP has a vivid red whose absorption spectrum is very similar to the molecular spectrum in solution. When exposed to acetone vapor, the film turns orange, and changes in photoelectrical properti…
A polycrystalline-silicon surface with hemispherical grains (HSG) is deposited by low-pressure chemical vapor deposition at 590 °C. At the temperature, 590 °C, the structure of the Si film just after deposition is amorphous, but crystallization of the amorphous Si occurs to produce HSG-Si during annealing after deposi…