Materials Literature
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Data are presented for the thermal diffusivity/conductivity of hot‐pressed mixtures of SiC and AlN. Results indicate that hot‐pressing at higher temperatures, which permits solid‐solution formation, results in significantly lower thermal diffusivity/conductivity than is obtained by hot‐pressing at lower temperatures,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPlasticizer migration from plasticized poly(vinyl chloride) into liquids. Effect of several parameters on the transferDjelloul Messadi, Jean Louis Taverdet, and Jean Maurice VergnaudCite this: Ind. Eng. Chem. Prod. Res. Dev. 1983, 22, 1, 142–146Publication Date (Print):March…
ABSTRACT The role of microtubules in silicon metabolism leading to valve formation was investigated in the pennate diatom Navicula saprophila Lange‐Bertalot & Bonik. By using synchronized cells blocked after mitosis and cytokinesis but prior to cell wall formation, effects due to inhibition of mitosis were elimina…
A diffusion model was developed to analyze the rate at which Fe 2+ /Fe 3+ equilibration occurs in a Ca‐Al‐borosilicate melt in an air atmosphere at 1260°C. The resulting diffusion coefficient of oxygen determined from the model of 3.7 × 10 −7 cm 2 /s is in agreement with the range of values reported for other glass‐me…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange coupling in triplet ground state dimeric molecules with specific reference to bis(.mu.-pyridine N-oxide)bis[bis(nitrato)(pyridine N-oxide)copper(II)] and bis(diethyldithiocarbamato)copper(II)William E. HatfieldCite this: Inorg. Chem. 1983, 22, 5, 833–837Publication…
Abstract The Boom Clay is an important raw material for the Belgian structural clay products industry. It can be divided into several lithological sub-units. In order to obtain an insight in the parameters which characterize these different units, and which affect the overall properties of the clay, a detailed chemica…
We have studied Williams Domain (WD) patterns in detail by observing tomograms with a polarizing optical microscope, confirming the following characteristic features: (1) there are two types of real images, upper and lower; (2) the spacings between the neighboring imaginary image lines are not uniform; and (3) when th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of polymer chain tacticity on the fluorescence of molecular rotorsRafik O. Loutfy and David M. TeegardenCite this: Macromolecules 1983, 16, 3, 452–456Publication Date (Print):March 1, 1983Publication History Published online1 May 2002Published inissue 1 March 1983http…
The weak-beam method of electron microscopy has been used to analyse the Shockley partial dislocations in a pure h.c.p. metal. Single crystals of cobalt were grown oriented for basal slip and deformed in compression. The dissociation of the basal glide dislocations into partials is resolved; tho arrangement of the mag…
The temperature dependence from 28 to 290°C of the excited-state absorption cross section\sigma_{2a}(E)in the gain wavelength region of alexandrite has been determined from the temperature dependence of the single pass gain (SPG) and of the fluorescence.\sigma_{2a}(E)and the emission cross section increase with temper…
Abstract A thermal aging study of carboxyl‐terminated polybutadiene (CTB) and poly(butadiene‐acrylonitrile) (CTBN) reactive liquid polymers has been conducted at 50°, 75°, 100°, and 125°C. All CTB and CTBNs are stable at 50°C aging. On aging at higher temperatures prior to use, viscosities of CTB and CTBNs increase, a…
Abstract The physical state of the material obtained during the various stages of preparation of a typical MgCl 2 ‐supported, high‐mileage propylene polymerization catalyst was studied by BET, mercury porosimetry, and x‐ray diffraction techniques. The starting MgCl 2 and the substance after HCl treatment have negligib…
The optical characteristics of Sb2Se3 and Sb2Te3 films are changed due to an amorphous-crystalline phase transition below 200 °C. The respective reflectivity of 400 Å Sb2Se3 and 300 Å Sb2Te3 films, each on a Te reflective layer, is increased from 10% to 30% and from 45% to 65% by laser radiation. Using these new mater…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMixing of states and the determination of ligand field parameters for high-spin octahedral complexes of nickel(II). Electronic spectrum and structure of bis(1,7-diaza-4-thiaheptane)nickel(II) perchlorateSusan M. Hart, Jan C. A. Boeyens, and Robert D. HancockCite this: Inorg.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEmission spectroscopic properties of dioxorhenium(V) complexes in crystals and solutionsJay R. Winkler and Harry B. GrayCite this: J. Am. Chem. Soc. 1983, 105, 5, 1373–1374Publication Date (Print):March 1, 1983Publication History Published online1 May 2002Published inissue 1…
The effect of time and temperature on the properties and structure of a willemite glass‐ceramic were measured. ‐0 polymorphs of willemite were found to exist in most of the glass‐ceramics. Those properties of the glass‐ceramic which depend primarily on the composition of the glassy phase (helium permeation and diffusi…
The stepwise protonation of three polymeric amines, containing a different shielding group between the amine moieties of the repeating units, has been studied from a thermodynamic standpoint. This was done for comparison purposes with structurally related poly(amido amines) whose monomeric units had been previously fo…
ADVERTISEMENT RETURN TO ISSUEPREVArticlePhase-transition studies in polymesomorphic compounds. 1. Density studies in N-(p-n-hexyloxybenzylidene)-p-n-butylanilineN. V. S. Rao and V. G. K. M. PisipatiCite this: J. Phys. Chem. 1983, 87, 5, 899–902Publication Date (Print):March 1, 1983Publication History Published online1…
Ferrous/ferric equilibria were determined in alkali‐alkaline‐earth borosilicate glass as a function of temperature, oxygen partial pressure, and glass composition. Expected linear relations are found between log(Fe 2+ /Fe 3+ ) and log( p O 2 ) or 1/ T . The slopes of the correlation with 10g( p O 2 ) are near the expe…
We present results of calculations of the reflectivity of diffraction gratings of sawtooth profile, and of electric fields near such gratings. We employ a method based on the use of the extinction theorem, and the grating amplitude is not assumed small. This approach also allows one to calculate the electric fields wi…