Materials Literature
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The chemistry of metal-metal bonded metalloporphyrins has undergone significant development during the last decade. The synthesis, chemical reactivity, physical properties and electrochemistry of metal-metal bonded metalloporphyrins containing both σ and donor-acceptor bonds are presented. These new classes of metallo…
The problem of a dielectric slab inside a parallel-plate capacitor is considered from the point of view of a simple force calculation. The usual method of presenting this problem, found in most textbooks, is via energy considerations. The method presented here allows corrections to the well-known result to be obtained.
Abstract A large amount of solids of (2-hydroxyethyl)trimethylammonium silicate, whose silicate skeleton has the double four-membered ring structure, was abruptly separated out from the mixed solution of (2-hydroxyethyl)trimethylammonium hydroxide aqueous solution and tetraethoxysilane after a few hours of stirring.
A systematic investigation of the magnetic properties of neodymium-cobalt-boron alloys rapidly solidified by melt spinning is reported. Room-temperature coercivities and energy products as large as 10.2 kOe and 5.2 MGOe, respectively, have been observed in ribbons comprised primarily of tetragonal Nd2Co14B. We find th…
The pentalene derivative 2 is only inductively stabilized. It was obtained by reaction of the dihydro derivative 1 with nickel peroxide. Comparison of the spectroscopic data with the results of MNDO calculations indicates that the Kekulé structure shown here dominates; that is, the bonds are fixed.
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStatistics of free-radical polymerizations revisited using a fragment approach. 1. Bifunctional monomersRoberto J. J. WilliamsCite this: Macromolecules 1988, 21, 8, 2568–2571Publication Date (Print):August 1, 1988Publication History Published online1 May 2002Published inissu…
Abstract The melt rheological properties of nickel powder filled polypropylene composites were investigated. The effect of filler concentration on shear stress‐shear rate data, melt viscosity and melt elasticity parameters were determined by using a capillary rheometer. The study shows that the materials follow a powe…
Iron, titanium, and vanadium analysis were performed on the tunicates Pyura chilensis Molina, 1782, and Ascidia dispar, and the inorganic chemistry of blood was investigated. The major ionic characterization of the blood plasma and cytosolic solutions were determined. Gel chromatography was used to secure information…
Single crystals of the magnetoplumbite (MP)-like compounds La1−xCex MgAl11O19 (0≤x≤1) have been grown from the melt by the flame fusion method. These crystals have been characterized by optical absorption and fluorescence which occur between 4f and 5d levels as well as by electron spin resonance at 20 K. For dilute sa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of singlet molecular oxygen (1.DELTA.gO2) in a solution-phase photosensitized reaction. 2. A comment on static quenchingKai Kong Iu and Peter R. OgilbyCite this: J. Phys. Chem. 1988, 92, 16, 4662–4666Publication Date (Print):August 1, 1988Publication History Publis…
Amorphous C:H films were prepared by rf glow discharge decomposition from CH 4 using a permanent magnet system to apply a static magnetic field perpendicular to the rf electric field. The structure and properties of a-C:H films have been investigated systematically with respect to the hydrogen content, hardness and co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSensitization and photoredox reactions of zinc(II) and antimony(V) uroporphyrins in aqueous mediaK. Kalyanasundaram, J. A. Shelnutt, and Michel GraetzelCite this: Inorg. Chem. 1988, 27, 16, 2820–2825Publication Date (Print):August 1, 1988Publication History Published online1…
The domain-growth kinetics in two different anisotropic two-dimensional XY-spin models is studied by computer simulation. The models have uniaxial and cubic anisotropy which leads to ground-state orderings which are twofold and fourfold degenerate, respectively. The models are quenched from infinite to zero temperatur…
Abstract The 125 MHz 13 C NMR spectra of some poly(dialkyl fumarates) (PDAF) and poly(dicycloalkyl fumarates) (PDCF) prepared by radical polymerization are measured in CDCl 3 solution at 60°C. The multiplet resonances of the main‐chain carbon atoms and the ester carbonyl carbon atoms are assigned to stereochemical tri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFourier transform far-infrared spectroscopic study of cation and anion dynamics in M,X sodalites, where M = lithium(1+), sodium(1+), potassium(1+), rubidium(1+), cadmium(2+); X = chloride, bromide, iodide, perchlorate, hydroxideJohn Godber and Geoffrey A. OzinCite this: J. P…
Upper critical fields have been studied for two series of Nb-Ta superlattices grown by molecular-beam epitaxy with both periodic and quasiperiodic (Fibonacci sequence) layering. X-ray results are presented to characterize the nature and quality of the layering. Positive curvature in the perpendicular upper critical fi…
An X-ray scattering study is presented of the lamellar/nematic/isotropic sequence in the lyotropic system DACI/H2O/NH4Cl. The whole reciprocal space of monocrystalline samples oriented in magnetic fields are reconstructed from their two dimensional sections on photographic films. Intense diffuse scatterings are observ…
Gallium is a metal that literally melts in your hand. It has low toxicity, near-zero vapor pressure, and a viscosity similar to water. Despite possessing a surface tension larger than any other liquid (near room temperature), gallium can form nonspherical ...Read More
Seven sources of cotton representing a wide range of fiber properties were roller ginned, saw ginned, or saw ginned plus processed through tandem saw lint cleaners or through an aggressive carding-type cleaner (Cottonmaster 1 ). Lint cleaner induced changes in fiber length and nep count were compared to fiber property…