Materials Literature
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The microstructure and crystal structure of bismuth oxide phases of as‐sintered and additionally heat‐treated ZnO varistor ceramics was examined by means of transmission electron microscopy and X‐ray powder diffraction. Grains of β‐Bi 2 O 3 present in as‐sintered samples were found to consist of two types of domains w…
Abstract Following a rapid overview of the various mechanisms involved in the process of polymer adhesion to metals, modelling is attempted in order to describe, at molecular scale, the metal—polymer interface in its technological reality. In particular, the concept of an active site is explained and the role of these…
We present a Raman scattering study of ultrathin SiGe superlattices. The spectra show evidence for the formation of superlattice structures with disordered interfaces. We explain the Raman peak energies in terms of strain and confinement effects and present a simple model for the Raman spectrum, from which we obtain s…
From a quenched, melt-spun ribbon of a specimen of Al76Mn24, bulk composition, the decagonal phase and a closely related ‘Al3Mn’ phase have been examined using analytical electron microscopic techniques. It is proposed that descriptions of the decagonal phase by analogy to an icosahedral axial system be abandoned and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsotropic-liquid crystal phase equilibrium in solutions of semiflexible polymers: poly(hexyl isocyanate)Takashi Itou and Akio TeramotoCite this: Macromolecules 1988, 21, 7, 2225–2230Publication Date (Print):July 1, 1988Publication History Published online1 May 2002Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnisotropic exchange in dinuclear complexes with polyatomic bridges. 2. Crystal and molecular structure and EPR spectra of tetraphenylphosphonium bis(.mu.-pyrazolato)bis[dihydrobis(1-pyrazolyl)borato](.mu.-chloro)dicuprate(II). Magneto-structural correlations in bis(.mu.-pyr…
Sputtered carbon overcoats on commercial rigid disks with thin‐film magnetic media are studied using transmission electron analysis (microscopy, microdiffraction, and energy‐loss spectroscopy), Raman spectroscopy, Auger spectroscopy, ellipsometry, x‐ray diffraction, and microhardness testing. Data from transmission el…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetic model for tensile deformation of polymers. 2. Effect of entanglement spacingYves Termonia and Paul SmithCite this: Macromolecules 1988, 21, 7, 2184–2189Publication Date (Print):July 1, 1988Publication History Published online1 May 2002Published inissue 1 July 1988htt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGas-phase reactions of hydroxyl radicals with the fuel additives methyl tert-butyl ether and tert-butyl alcohol over the temperature range 240-440 KTimothy J. Wallington, Philippe. Dagaut, Renzhang. Liu, and Michael J. KuryloCite this: Environ. Sci. Technol. 1988, 22, 7, 842…
The gene (nprM) for the highly thermostable neutral protease of Bacillus stearothermophilus MK232 was cloned in Bacillus subtilis using pTB53 as a vector. The nucleotide sequence of nprM and its flanking regions was determined. The DNA sequence revealed only one large open reading frame, composed of 1656 base pairs an…
A solid-state reaction process for producing ohmic contacts to polished natural semiconducting diamond surfaces is discussed. The approach attempts to systematically characterize the processes which occur when metallic films of known thickness are deposited on a smooth diamond surface and annealed in the solid state u…
X-ray absorption spectra have been measured using electron detection with both vacuum and helium gas surrounding the samples. The samples consisted of thin iron films covered with various thicknesses of aluminum to determine the contribution versus depth. The height of the iron K--absorption-edge jump decreases expone…
The creep behavior of a commercial grade of reaction‐bonded silicon carbide was characterized at a temperature of 1300°C. Creep occurred more easily in tension than in compression. At a given applied stress, the steady‐state creep rate in tension was found to be at least 20 times that obtained in compression. In both…
Abstract The reaction of the OH radical with some carboxylic and hydroxycarboxylic acids was investigated by trapping the resultant radicals as endgroups of poly(methyl methacrylate), which were detected and estimated by the sensitive dye partition technique. The rate constants of the reaction at 25°C and p H = 1.0 wi…
Abstract One of the major reasons coatings are used in internal combustion engines is to enhance the oxidation/corrosion resistance in contaminated corrosive environments. Such atmospheres are often encountered in diesel and utility gas turbines. Aircraft gas turbines are usually subjected to simple oxidation conditio…
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Both silicon carbide and aluminum silicon carbide have simultaneously been obtained directly from naturally occurring aluminosilicate by carbothermal reduction for the first time. A precursor of a montmorillonite–polyacrylonitrile (PAN) intercalation compound was heated at 1700°C in Ar. For comparison, montmorillonite…
Diaspores are disseminules specialized for dispersal and for other functions contributing to seedling establishment and seedling vigor. The winterfat (Eurotia lanata) diaspore consists of hairy bracts enveloping a utricle. Testa, embryo, and perisperm make up the enclosed seed. This general diaspore morphology also oc…
Abstract The existence of spin‐polarized complexes or magnetic polarons in magnetic semiconductors has been suggested theoretically some time ago, but up to now there is little experimental evidence of this phenomenon. With this in view, electron paramagnetic resonance is investigated ( g ‐factor and linewidth tempera…
A synthetic route is described for making carbothermally reduced powders from colloidal oxide precursors trapped in a polymer matrix. The entrapping resin, which is formed by polymerization of a monomer dissolved in the colloid, serves both to minimize particle agglomeration during reaction and as the source of carbon…