Materials Literature
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The optical behaviour of liquid-crystalline 'Blue Phases' (BP) of polar cholesterogenic compounds in electric Fields up to 100 kV • cm -1 has been investigated by means of polarization microscopy. By an observation parallel to the field direction a birefringence dependent on the Field strength was detected in the BP I…
The repassivation of pits, by which pitting corrosion initiated in an aggressive environment ceases, is studied from the kinetic point of view. Consideration of irreversible thermodynamic stability suggests that the repassivation process starts as soon as the monolayer formation of the metal oxide becomes stable at th…
Abstract The morphology of blends of high‐density polyethylene (PE) and isotactic polypropylene (PP) was studied by mesans of optical and scanning‐electron microscopy. In the range of 10 to 90 percent by weight PE, these blends are two‐phase systems, the components of which crystallize separately into discrete phases.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of the first ansa-cyclotriphosphazenePaul J. Harris and Kenneth B. WilliamsCite this: Inorg. Chem. 1984, 23, 11, 1495–1496Publication Date (Print):May 1, 1984Publication History Published online1 May 2002Published inissue 1 May 1984https://pubs…
The solid‐state reaction between titanium and titanium carbide to form substoichiometric titanium carbide was studied by annealing single‐crystal diffusion couples at T = 1350° to 1525°C. The thickness of the epitaxially grown carbide layer was almost an order of magnitude greater than that predicted from published va…
Abstract Polymer blends of poly(ϵ‐caprolactone) (PCL) and poly(styrene‐co‐acrylonitrile) (SAN), containing 24 wt % acrylonitrile (AN), were prepared, and their transition behavior was examined by thermal analysis and dynamic mechanical testing. The blends were judged to be compatible on the basis of the presence of a…
A methodology based on chemical thermodynamics has been developed to treat the transport of volatile fission products (FPs) through the core and the primary system. The FPs considered are cesium, iodine, tellurium, strontium, and ruthenium, which may pose the major biohazard in postulated severe accidents in light wat…
The one-body linear response expressions (diagonal and nondiagonal) for the dc electrical conductivity, obtained in a previous paper, are applied to specific situations. In the case of ‘‘no collisional current’’ we evaluate the relaxation times which enter an expression (diagonal) for the longitudinal magnetoconductiv…
Summary Calcium and phosphate concentrations in milk ultrafiltrate prepared at 37 °C over the pH range 4.0–8.0 have been measured and used to calculate the apparent solubility products for various calcium phosphates in milk. Micellar calcium phosphate had a constant Ca/P i = 1·58·10·03 at all pH values and a near-inva…
A procedure is suggested for the refinement of a set of protein phases and for its extension to a higher resolution, which is a development of the approach of Agarwal & Isaacs [Proc. Natl Acad. Sci. USA, (1977), 74, 2835-2839]. A new set of phases is obtained by combining the starting phases with those calculated from…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFlexibility of the framework of zeolite Rho. Structural variation from 11 to 573 K. A study using neutron powder diffraction dataJohn B. Parise, Thomas E. Gier, David R. Corbin, Lloyd Abrams, James D. Jorgensen, and Edward PrinceCite this: J. Phys. Chem. 1984, 88, 11, 2303–2…
Abstract 1. Acid-base interactions determine adsorption and bonding of polymers to fillers. 2. Quantitative predictability of the enthalpy of such bonding is attainable from the Drago C and E equation once the C and E constants are determined for polymers and fillers. 3. Infrared and calorimetric methods are discussed…
We report the successful application of the freeze fracture technique for obtaining transmission-electron-microscope pictures of a thermotropic cholesteric material and its blue phase. It is shown that under rapid quenching these phases supercool and conserve their structure at liquid-${\mathrm{N}}_{2}$ temperature. T…
The saturation magnetization and the magnetocrystalline anisotropy were measured on single crystals in the solid solution series SrZn2-xCoxFe16O27(SrZn2-xCox-W) at 298 K and 6 K. Lattice constants and Curie-temperatures are also given as a function of the composition. The magnetocrystalline anisotropy changes from uni…
Radioactivity in fusion reactors can be effectively controlled by materials selection. The detailed relationship between the use of a material for construction of a magnetic fusion reactor and the material's characteristics important to waste disposal, safety, and system maintainability has been studied. The quantitat…
Abstract A comprehensive mathematical model for the finishing stages of polyethylene terephthalate (PET) synthesis is developed. The model takes into account the variables which have significant influences on polymerization but have not been hitherto taken into account, e.g., changing interfacial concentration and the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrically conducting polymers: arsenic pentafluoride-doped poly(phenylenevinylene) and its analogsK. D. Gourley, C. P. Lillya, J. R. Reynolds, and James C. W. ChienCite this: Macromolecules 1984, 17, 5, 1025–1033Publication Date (Print):May 1, 1984Publication History Publ…
Abstract The thermodynamic significance of the single‐ion activity is limited to its use, through a self‐consistent set of conventions, to predict accurately the activities of electrolytes. Despite this fact, single‐ion activities appear to be of increasing importance in the study of soil‐plant relationships and in th…
The consequences of the avalanche‐breakdown model during the growth of anodic tantalum oxide in electrolytes are discussed. Typical values of the injected current density at the electrolyte‐oxide interface, the impact ionization coefficient, and the electric field during anodization have been determined from the anodi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural chemistry of pentacoordinated silicon. Molecular structures of the pentafluorosilicate anion and the diphenyltrifluorosilicate anionDietmar Schomburg and Roland KrebsCite this: Inorg. Chem. 1984, 23, 10, 1378–1381Publication Date (Print):May 1, 1984Publication His…