Materials Literature
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Abstract Experimental evidence for the effect of starting compositions on the growth of CaWO4 crystals from Na2WO4 flux was given on the basis of the obtained solubility data. Crystal growth was conducted by heating mixtures at 1100°C for 5 h, followed by cooling to 500°C at a rate of 5°C h−1. Octahedral crystals up t…
The disproportionation of the complex (Et 2 N) 3 Ti(μ-PCy 2 )Ni(PPh 3 ) affords the coordinatively unsaturated species Ni(PPh 3 ) 3 , 1. This compound crystallizes in the triclinic space group [Formula: see text], with a = 18.483(4) Å, b = 16.203(3) Å, c = 17.783(4) Å, α = 105.85(2)°, β = 117.33(3)°, γ = 92.33(3)°, Z…
Incubation of adenylosuccinate synthetase from Escherichia coli with low concentrations of pyridoxal 5'-phosphate (PLP) resulted in a rapid loss of activity (92%), concomitant with the formation of a Schiff base. The inactivation of the enzyme by PLP is apparently first order with respect to PLP. The pseudo-first orde…
Abstract A novel method for preparing Prussian Blue (PB) films cast from a PB solution of organic solvent containing cationic surfactants is reported. The cyclic voltammogram for the oxidation of the film is much simpler than that of an electrochemically deposited PB film. The electrochromic behavior was investigated…
Abstract An experimental programme is described, in which a number of thermo‐analytical techniques, differential scanning calorimetry (DSC), thermogravimetry (TG and DTG) are applied to investigate the combustion of black powder. The primary aim has been to investigate, and determine qualitatively and quantitatively,…
An inelastic neutron scattering study of ${\mathrm{KTa}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Nb}}_{\mathit{x}}$${\mathrm{O}}_{3}$ (x=0.012) (KTN) shows that there is a marked softening of the zone-center optic mode with decreasing temperature. This mode reaches a nonzero minimum energy of \ensuremath{\sim}0…
Is 1 an organic ferromagnet? It certainly exhibits an astonishing degree of magnetic susceptibility at high temperature (16 to 57 × 10−9m3mol−1 at room temperature), and the temperature dependence associated with this magnetic susceptibility deviates considerably from predictions based on the Curie-Weiss law. Ferromag…
The high‐temperature corrosion of bulk silica glass was studied in pure oxygen and in SO 3 ‐containing oxygen atmospheres in the presence of liquid sulfate deposits at temperatures of 700° and 1000°C. No reaction and devitrification were observed without Na 2 SO 4 on the surface. The wetting of the silica by the sulfa…
The formation behavior and magnetic properties of Fe 7 C 3 particles were investigated under atmospheric pressure. The starting material of barium-containing iron oxide was carbureted with CO by heat treatment. Fe 7 C 3 particles were formed in the reaction temperature range of 300–375°C along with a small amount of F…
Photoelectron spectra of the bicyclo[1.1.1]pentanes 1 and 2 reveal a high degree of splitting (0.7 eV) between the π-MOs of the ethynyl residues and the 4p orbitals of the bromine atoms, respectively. This is presumably due to strong interaction between the π systems and the σ system of the bicyclopentane framework. A…
Stress corrosion cracking (SCC) of type 304 (UNS(1) S30400) and type 316 (UNS S31600) austenitic stainless steels in acidic chloride and sulfate solutions has been investigated as functions of pH and concentration by using the constant load method. It is found under a constant stress condition of 437 MPa that the loga…
The advantages of multilayer coated blazed gratings are discussed, and multilayer/grating matching conditions are considered. Measurements of a W/C multilayer-coated, 2000 g/mm 3.8° blaze angle ion-etched grating and superpolished flat are reported. These include reflectometer measurements as well as operational perfo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of alkali and alkaline-earth metals on the resistivity to coke formation and sintering of nickel-alumina catalystsIenwhei Chen and Fan Lun ChenCite this: Ind. Eng. Chem. Res. 1990, 29, 4, 534–539Publication Date (Print):April 1, 1990Publication History Published onlin…
It has been shown previously that linear polyethylenes undergo increases in crystallinity and peak melting temperature after irradiation, the magnitude of the effects being dependent upon the dose and the molecular weight of the polymer. The crystallinity was also found to increase with time after irradiation (aging)…
Diamond thin film technology I. In the first article of a regular series Peter Bachmann of the Philips Research Labs in Aachen, FRG, describes the different methods used to deposit diamond in films (see figure). Diamond in this form has many applications e.g. as an abrasive material, in lithography masks, microwave wi…
Abstract Isothermal aging after a quench from above the glass‐transition temperature ( T g ) to below it was studied as a function of cross‐link density for model epoxy networks using small deformation stress relaxation experiments. We found that time‐aging time and time‐cross‐link density superposition principles des…
The adsorption-desorption behaviour of four pesticides, in four Western Australian soils differing in their physico-chemical properties, has been studied using a batch technique. Sorption data for Fenamiphos, Linuron and Simazine could be fitted to a Freundlich-type equation, while that for Diquat more closely fitted…
Abstract Quantitative thermal analysis of a family of semicrystalline polyimides containing from one to three ethylene glycol spacer units has been conducted. Special emphasis has been placed upon the changes in the thermodynamic properties resulting from the successive additions of ethylene glycol units. The solid an…
Abstract We discuss two new two-dimensional nuclear quadrupole resonance experiments, both based on the principle of nutation spectroscopy, which can be used to determine the asymmetry parameter, and thus the full quadrupolar tensor, of spin-3/2 nuclei at zero applied magnetic field. The first experiment is a simple n…
This paper presents the production of the a reverse-mode microdroplet liquid crystal (RMLC) light shutter display. In this unit, the display is formed by a thin polymer film with dispersed liquid crystal microdroplets. The display is light transmissive in the absence of an applied electrical field. The display is conv…