Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA mechanistic study of polybenzoxazole formation with model compoundsYing-Hung So, Jerry P. Heeschen, and Cheryl L. MurlickCite this: Macromolecules 1995, 28, 21, 7289–7290Publication Date (Print):October 1, 1995Publication History Published online1 May 2002Published inissue…
The distribution of divalent iron and nickel over two metal sites of differing coordination geometry in NiFe 2 (PO 4 ) 2 , sarcopside, has been investigated by resonant X-ray and time-of-flight neutron powder diffraction. To assess the reproducibility of the X-ray technique, data have been collected from instruments X…
<div class="htmlview paragraph">A novel approach was proposed and investigated to reduce unburned hydrocarbon emissions from spark-ignition engines using in-cylinder catalysts. The unburned hydrocarbons in spark-ignition engines arise primarily from sources near the combustion chamber walls, such as flame quench…
During the growth of barrier-type anodic films on aluminium in aqueous electrolytes, electrolyte species, derived from electrolyte anions, are usually incorporated into an essentially alumina film. Here, use has been made of this phenomenon to investigate the behaviour of anions near the film surface that leads to app…
The Peierls-Nabarro model was developed originally to describe core spreading on the slip plane of a dislocation. Screw dislocations have more than one slip plane and are expected to be dissociated into a non-planar fashion conformable to the symmetry about the screw axis. In this work, the Peierls-Nabarro model is ge…
The nature and performance of our patented catalysts, with platinum on carbon and polytetrafluorethylene [ Pt/C/PTFE ] and platinum on styrenedivynilbenzene and polystyrene [Pt/STB/PS], used in a water - hydrogen isotope exchange process are presented.The behaviour of the two catalysts in tritiated water was tested by…
Sorption behavior of tritium to isotropic graphite is discussed including solubility, diffusivity in the bulk of isotropic graphite and sorption capacity of hydrogen isotopes on the surface of isotropic graphite. The solubility and the diffusion coefficient of hydrogen isotopes in the graphite are obtained using the b…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAb Initio Study of the Strong Binding of BeO to Li, Be, and B Atoms in the Hyperstoichiometric LiOBe, BeOBe, and BeOB MoleculesAlexander I. Boldyrev and Jack SimonsCite this: J. Phys. Chem. 1995, 99, 41, 15041–15045Publication Date (Print):October 1, 1995Publication History…
Short-range order has been investigated in three glasses with composition 0.30MeO·0.35Na2O·0.35P2O5 (Me = Ni, Zn, Cu), which are composed of small, ionic units. X-ray diffraction has been used to study the cation coordination; average coordination numbers turned out to be about 6 for Ni2+, 5 for Cu2+, and 4.5 for Zn…
Abstract When poly(methyl methacrylate) films containing UV absorbers are exposed to UV light, the absorbers undergo photodegradation resulting in loss of absorbance. If the data extend for less than one half‐life, both zero and first order kinetic treatment give fairly linear fits, but the rate constants so derived a…
The structural similarity between Cdx(CN)y and SixOy in the AxBy composition, A taking tetrahedral positions linked successively with B to build up multi-dimensional structures such as 1D-chains, 2D-layers, or 3D-lattices, can be utilized in developing mineral-like but unprecedented inclusion or supramolecular structu…
Abstract Two carbamoyl‐type activators of ε‐caprolactam (CL) anionic polymerization have been used in quasi ‐adiabatic conditions with sodium caprolactamate as initiator, at different concentrations and relative ratios. The reaction products have been characterized in terms of high‐polymer content and extent of crossl…
The dispersion of the spin waves in EuS has been investigated by means of neutron scattering. In zero field and at small momentum transfer q, the energy \ensuremath{\Elzxh}${\mathrm{\ensuremath{\omega}}}_{\mathit{q}}$ of the spin waves is proportional to q in agreement with the predictions of spin-wave theory that inc…
Abstract The atomic structure of the (10 1 2) twin boundary in zinc is investigated theoretically by atomistic calculations and experimentally by high resolution electron microscopy. For computer simulations, the atomic interactions are described by a many‐body potential of the Finnis‐Sinclair type and are applied to…
Single crystals of Ce 2 (WO 4 ) 3 have been prepared by crystallisation from molten mixtures of WO 3 and CeO 2 . The compound shows monoclinic symmetry, a = 7.813(4), b = 11.720(2), c = 11.586(3), β = 109.36(3)°, Z = 4, and is isotypic to Eu 2 (WO 4 ) 3 , but shows large differences of the atomic coordinates especiall…
Abstract Isothermal melt crystallization kinetics were investigated by differential scanning calorimetry (DSC) for virgin and α‐chloronaphthalene solvent‐treated poly(phenylene sulfide) (PPS) systems. The overall crystallization rates were found to be much faster for the solvent‐treated PPS than for the virgin neat PP…
In this paper, we describe a unique low frequency underwater sound source called the combustive sound source (CSS). In this device, a combustible gas mixture is captured in a combustion chamber and ignited with a spark. The ensuing combustion produces expanding gases which in turn produce high intensity, low frequency…
We have carried out Brownian dynamics simulations of binary mixtures of charged colloidal suspensions of two different diameter particles with varying volume fractions \ensuremath{\varphi} and charged impurity concentrations ${\mathit{n}}_{\mathit{i}}$. For a given \ensuremath{\varphi}, the effective temperature is lo…
Abstract Composites of elastomers and cellulose have been investigated. Copolymers of styrene‐butadiene rubber (SBR) and acrylonitrile‐butadiene rubber (NBR) as well as natural rubber (NR) were compounded with regenerated cellulose (Cellulose II). The technique for the incorporation of filler was based on the coprecip…
We describe the sensitivity of sub-micron via integrity to high-temperature processing following via etch. It has been observed that thermal expansion of Al into the via hole, before tungsten deposition, may result in the fabrication of a deformed tungsten plug. Our results indicate that relaxation of the Al can give…