Materials Literature
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A stable wurtzite phase of ZnO is commonly observed. In this letter, we report the growth and characterization of zinc-blende ZnO on GaAs(001) substrates. The ZnO films grown on GaAs(001) substrates using microwave-plasma-assisted metalorganic molecular-beam epitaxy were characterized by reflection high-energy electro…
By introducing a thin MgO buffer, layer-by-layer growth of ZnO epilayers on Al2O3(0001) substrates is achieved by plasma-assisted molecular beam epitaxy. The MgO buffer is very effective on the improvement of surface morphology during the initial growth stage, which eventually leads to an atomically flat surface. As a…
The segmental dynamics of 1.5-2.0 nm polymer films confined between parallel solid surfaces is investigated with dielectric spectroscopy in polymer/silicate intercalated nanocomposites. The confinement effect is evident by the observation of a mode, much faster than the bulk-polymer alpha relaxation and exhibiting muc…
The phonon thermal conductivity of a multilayer is calculated for transport perpendicular to the layers. There is a crossover between particle transport for thick layers to wave transport for thin layers. The calculations show that the conductivity has a minimum value for a layer thickness somewhat smaller then the me…
A short review of the experimental findings concerning the stabilization of emulsions by solid particles is given. We then describe the preparation and properties of water-in-oil (w/o) emulsions stabilized by nanometer-sized hydrophobic silica particles alone. Emulsions of median diameter equal to 0.6 μm are completel…
A new geographical locality for Extubocellulus spinifer is reported. The species was isolated during 1980 from a temperate ‘slikke’ (intertidal mudflat) in North Brittany and grown in batch culture for several years in F/2 medium under constant temperature and light conditions. No teratological modifications were obse…
Genes encoding the mitochondrial (SHM1) and cytosolic (SHM2) serine hydroxymethyltransferases, and the L-threonine aldolase gene (GLY1) from Candida albicans were cloned and sequenced. All three genes are involved in glycine metabolism. The C. albicans Shm1 protein is 82% identical to that from Saccharomyces cerevisia…
Thin films of amorphous carbon (a-C and a-C:H) have been deposited using different carbon precursor materials such as camphor - a natural source, graphite and CH 4 /H 2 mixture by different deposition methods, such as ion beam sputtering, pyrolysis, pulsed laser deposition and r.f. plasma CVD. The films are subjected…
Carbon nitride and silicon carbon nitride have been grown by microwave plasma chemical vapor deposition, electron-cyclotron-resonance plasma chemical vapor deposition, magnetron sputtering and ion beam sputtering. Depending on the specific process details, a wide range of microstructure and morphologies has been demon…
In the Arctic Sea, common spring species such as Fossula arctica , Fragilariopsis cylindrus , F. oceanica , Thalassiosira antarctica var. borealis , T. hyalina and Chaetoceros sociali s have a somewhat different distribution, depending on the area in question. Furthermore, the pennate chain-forming Fossula arctica and…
The growth mechanism of vanadium films deposited on the SnO 2 (110) surface at room temperature and the structure of the phases formed after annealing at 800 K were studied using X-ray photoelectron spectroscopy (XPS), low-energy ion-scattering (LEIS), low-energy electron diffraction (LEED), and X-ray photoelectron di…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTImpact of New Findings Concerning Urea Thermal Decomposition on the Modeling of the Urea-SNCR ProcessM. U. Alzueta, R. Bilbao, A. Millera, M. Oliva, and J. C. IbañezView Author Information Department of Chemical and Environmental Engineering. University of Zaragoza, 50…
The influence of oxidation on the production of high-porosity carbons from phenol−formaldehyde resins with KOH activation were examined under various preparation conditions. The activation process principally consisted of KOH impregnation followed by carbonization. Experimental results showed that prior to carbonizati…
Cryogenic mechanical alloying is used to incorporate a poly(methyl methacrylate- b -isoprene) (MI) diblock copolymer into blends of poly(methyl methacrylate) (PMMA) and polyisoprene (PI). Mechanical milling of the copolymer promotes a reduction in the molar mass of the M block, as discerned from glass transition tempe…
The mechanism of orotidine 5'-monophosphate decarboxylase (OMP decarboxylase, ODCase) was studied using the decarboxylation of orotic acid analogues as a model system. The rate of decarboxylation of 1,3-dimethylorotic acid and its analogues as well as the stability of their corresponding carbanion intermediates was de…
The physical structure and chemical and mineralogical composition of Mazidagı (Turkey) phosphate rock have been investigated by using chemical analysis, X-ray powder diffraction, scanning electron microscopy (SEM), thermal analysis, mercury porosimetry, and BET surface area methods. The results of X-ray powder diffrac…
Flow reactor experiments were conducted to study carbon deposit formation from decomposition of a jet fuel (JP-8) at 500 °C and 500 psig for 5 h on the surface of two superalloys, Inconel 600 and Inconel X. The deposits collected on superalloy surfaces were characterized by temperature-programmed oxidation, size exclu…
The course of dispersion polymerization of aniline using ammonium peroxodisulfate (APS) as initiator oxidant and poly(vinyl alcohol) as stabilizer in different media, viz., water (1 M HCl), water (pH = 2.41, [aniline] ≡ [HCl]), and aqueous ethanol (1 M HCl), was followed spectrophotometrically. It was found that the a…
[reaction: see text] Benzyl aryl ether dendrimers containing photosensitive, veratryl-based o-nitrobenzyl AB linkages (bold bonds) were prepared to the third generation and shown to undergo site-specific degradation when irradiated with ultraviolet light.
We have investigated different models for parameterizing the frequency-dependent molecular polarizability. The parameterization is based on an electrostatic model for interacting atoms and includes atomic polarizabilities, atom-type parameters describing the damping of the electric fields and the frequency dependence.…