Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanistic considerations in the photodisproportionation of .mu.-oxo-bis((tetraphenylporphinato)iron(III))Mark W. Peterson, David S. Rivers, and Robert M. RichmanCite this: J. Am. Chem. Soc. 1985, 107, 10, 2907–2915Publication Date (Print):May 1, 1985Publication History Pub…
Droplets of uncoated molten Si (0.4–0.8 mm diameter) have been undercooled 250 °C. Ge droplets of similar size have been undercooled 280 °C in a B2O3 flux. The observed nucleation onset temperatures of both Si and Ge droplets are at or below the predicted amorphous phase melting temperatures Ta1. The solidified struct…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of the psammaplysinsDeborah M. Roll, Clifford W. J. Chang, Paul J. Scheuer, George A. Gray, James N. Shoolery, Gayle K. Matsumoto, Gregory D. Van Duyne, and Jon ClardyCite this: J. Am. Chem. Soc. 1985, 107, 10, 2916–2920Publication Date (Print):May 1, 1985Publicati…
Abstract Low antiferromagnetism of μ-alkoxo-μ-carboxylatodicopper(II) complexes were reasonably explained in terms of the orbital countercomplementary effect based on Hoffmann’s theory for superexchange interaction.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxochromium compounds. 2. Reaction of oxygen with chromium(II) and chromium(III) porphyrins and synthesis of a .mu.-oxo chromium porphyrin derivativeDavid J. Liston and Bruce O. WestCite this: Inorg. Chem. 1985, 24, 10, 1568–1576Publication Date (Print):May 1, 1985Publicatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTImproved procedure for the tungstate-catalyzed epoxidation of .alpha.,.beta.-unsaturated acidsKenneth S. Kirshenbaum and K. Barry SharplessCite this: J. Org. Chem. 1985, 50, 11, 1979–1982Publication Date (Print):May 1, 1985Publication History Published online1 May 2002Publis…
The selection of an optimal parametric angle θ describing a closed magnetic flux surface is considered with regard to accelerating the convergence rate of the Fourier series for the Cartesian coordinates x(θ,φ)≡R−R0 and y(θ,φ)≡Z−Z0. A system of algebraic equations, which are quadratic in the Fourier amplitudes of x an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilver particles on stochastic quartz substrates providing tenfold increase in Raman enhancementM. Meier, A. Wokaun, and T. Vo-DinhCite this: J. Phys. Chem. 1985, 89, 10, 1843–1846Publication Date (Print):May 1, 1985Publication History Published online1 May 2002Published ini…
We discuss the ground-state phase diagram of the molecular-crystal model for electron-phonon interactions in the presence of on-site (U) and nearest-neighbor (V) electron-electron interactions in the half-filled-band sector. The system is analyzed as a function of the phonon frequency (\ensuremath{\omega}), electron-p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization and reactions of (C5H5)(CO)2Fe:C(CH3)2+ and (C5H5)(CO)2Fe:CH-CH:C(CH3)2+Charles P. Casey, William H. Miles, and Hideyuki TukadaCite this: J. Am. Chem. Soc. 1985, 107, 10, 2924–2931Publication Date (Print):May 1, 1985Publication History Published o…
Abstract Since 1963, production of all epoxy esters has ranged from 60 to 150 million lb annually, a steady 7% of the 1 to 2 billion lb of annual plasticizer production. Growth rates in production averaged 4.3% for all plasticizers, 3.8% for all epoxy esters and 5.0% for epoxidized soybean oil (ESBO). ESBO accounted f…
Surface‐enhanced Raman scattering (SERS) has been used as a complementary in situ technique for electrochemical measurements in order to investigate five structurally related N‐heterocyclic molecules on copper. Their different abilities to act as corrosion inhibitors are discussed in view of structural information obt…
When Clostridium cellulolyticum was grown with cellulose MN300 as the substrate, the rates of growth and metabolite production were found to be lower than those observed with soluble sugars as the substrate. At low cellulose concentrations, the growth yields were equal to those obtained with cellobiose. The main ferme…
Replication functions of a bacteriophage P1 miniplasmid are carried on a 1.2-kilobase pair (kb) segment that can be subdivided into a 245-base pair (bp) replication origin and a 959-bp region that encodes a protein required for replication (RepA). The origin region contains five 19-bp direct repeats. By using primer e…
Two effects are of outstanding importance for the mechanical behaviour of polymer-additive mixtures, (a) the plasticizer effect and (b) an effect, which we shall refer to as the “β-suppression” effect: Additives can suppress the secondary (β-) relaxations of the polymer. The β-suppression effect is studied on a number…
Steadily growing, spatially periodic, two-dimensional cellular interfaces with groves up to 15 times longer than their wavelength are calculated by a novel finite-element method applied to the solutal model for solidification that includes diffusion in the solid. The deep cells are formed by either continuously decrea…
Gas phase and surface phenomena responsible for etching polyimide in O2–CF4 rf plasmas have been investigated. The dependence of the etch rate of polyimide on the relative concentrations of these two gases was compared with data from optical emission spectra, mass spectra, and x-ray photoelectron spectroscopy (XPS). T…
The cathodic properties of a number of stainless steels, which were exposed to natural seawater flowing at 0 to 2.5 m/s and polarized to potentials from –300 to –950 mV SCE, have been studied. The current density development at constant potential and the free corrosion potential during the exposure time were recorded…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric relaxation of liquid crystalline polyacrylates and polymethacrylatesRudolf Zentel, Gert R. Strobl, and Helmut RingsdorfCite this: Macromolecules 1985, 18, 5, 960–965Publication Date (Print):May 1, 1985Publication History Published online1 May 2002Published inissue…
The microstructures of several centrifugally cast stainless steels containing strong carbide formers (Nb, Ti, and Zr) have been examined as cast and after prolonged creep in the range 800–1000°C. These additions refine the eutectic carbide, changing the morphology and composition as illustrated by the behaviour of IN…