Materials Literature
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In the present study, vanadium oxide films were grown on water-cooled sapphire, silicon, and glass substrates by reactive sputter deposition using a vanadium target and rf-excited argon discharges containing 0%–25% oxygen. Optical emission spectroscopy was used for in situ discharge diagnostics. Films were characteriz…
Abstract A series of ten commercial tread-grade carbon blacks were evaluated in a 60/40 NR/BR truck tire tread formulation. A number of important physical properties and performance criteria were assessed in terms of carbon black surface area and DBPA. Significant response equations were obtained for viscosity, bound…
Abstract meso ‐Tetraalkylporphyrinogens are easily formed and unexpectedely stable compounds. Only through forced oxidation can they efficiently be converted into porphyrins. meso ‐Tetraphenylphlorin was trapped as an intermediate in the Rothemund meso ‐tetraphenylporphyrin synthesis.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal decomposition of formamide: shock tube experiments and ab initio calculationsTerumitsu Kakumoto, Ko Saito, and Akira ImamuraCite this: J. Phys. Chem. 1985, 89, 11, 2286–2291Publication Date (Print):May 1, 1985Publication History Published online1 May 2002Published in…
The dynamic contact angle for a contact line moving over a solid surface with random sparse spots of roughness is determined theoretically in the limit of zero capillary number. The model exhibits many of the observed characteristics of moving contact lines on real rough surfaces, including contact-angle hysteresis an…
Spectroscopic methods, i.e., Fourier transform infrared (FT-IR), carbon-13 nuclear magnetic reasonance (13C NMR), and ultraviolet (UV) spectroscopy, were used to investigate the actual chemical composition of oilfield corrosion inhibitors. Inhibitor formulations consisting of an amide or imidazoline reacted with a dim…
Dialkyl fumarates with bulky ester substituents were found to homopolymerize easily in the presence of 2,2′-azobisisobutyronitrile. Among these fumarates, diisopropyl fumarate (DiPF) homopolymerized with the above initiator (20mmol/1) in bulk at 40∼60°C to give homopolymers with number-average molecular weight of 70 0…
Molecular field theory is used to determine the temperature-composition phase diagram and component order parameters of binary mixtures of nematic liquid crystals. A rotationally invariant form of the Maier-Saupe pseudopotential is generalised to two-component mixtures; the parameters of the theory are the ratios of t…
Shells from several Mollusca collections have been examined. Efflorescence—white or grey crystalline salts on the exterior or, to a lesser extent, the interior of the shells—is a widespread problem and occurs in many shell species, both land and sea shells. The efflorescence has been identified by means of several tec…
Drei linear verbundene Cu ⊕ ‐Ionen , die von drei parallelen N 5 ‐Zickzackketten derartig koordiniert werden, daß jedes metall‐Ion trigonal‐planar von N‐Atomen umgeben ist, liegen im Pentaazadienid‐Komplex 1 vor. Die roten Kristalle von 1 zeigen schwachen Paramagnetismus; die Cu‐Cu‐Abstände in den ketten sind die kürz…
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…