Materials Literature
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The stoichiometry and the stability of the complexes formed in the Th(IV)-H 2 O-CO 2 (g) system have been investigated by the EMF technique in a 3.000 M NaClO 4 ionic medium at 25 o C, using coulometry to vary the hydrogen ion concentration
Model experiments have been conducted on a series of alumina samples in which the microstructures have been tailored to conform to the classical configurations depicted in the models of final-stage sintering. Simultaneous measurements of sintered density, grain size, pore number density and pore size distribution were…
Comparison of results obtained from 1,1′- and 1,3-disubstituted ferrocenes clearly demonstrates the influence of structural isomerism on the mesomorphic properties.
In the past two decades, photoelectron spectroscopy has emerged as an indispensable tool for studying the electronic properties of solids and their surfaces. 1'2 This is because it provides the most direct and complete method of measuring all the occupied electronic states in a solid, both core and valence. This revie…
A Mg85Zn12Ce3 amorphous alloy containing finley dispersed hcp-Mg particles was found to form either by melt spinning or by heat treatment of the melt-spun ribbon. The particle size and interparticle distance of the hcp-Mg phase can be controlled in the range of 3 to 20 nm and 5 to 10 nm, respectively. The mixed phase…
This paper discusses the conformational phase change of an isolated polymer chain which is capable of forming physical bonds with solvent molecules. On the basis of the mean-field theory of Flory type, we derive a formula for the temperature dependence of the expansion factor of the chain. Our theory takes account of…
Calcite surface energy and morphological changes observed in the presence of Mg2+ and Li+ ions are predicted using atomistic simulation based on the Born model of solids.
Anodic segregation of selected alloy constituents is found by ESCA analysis to occur as a result of active dissolution and during the passivation of stainless steel in deaerated acid. The resulting surface composition of the steel is radically different from the bulk and conditions seem to favour the formation of surf…
All large spacecraft are susceptible to impacts by meteoroids and orbiting space debris. These impacts occur at extremely high speed and can damage flight-critical systems, which can in turn lead to a catastrophic failure of the spacecraft. Therefore, the design of a spacecraft for a long-duration mission must take in…
Historique du developpement des boucliers ceramiques, performances ballistiques, comportement lors de l'impact et de la penetration d'un projectile.
The large subunit of Escherichia coli carbamoyl phosphate synthetase (a polypeptide of 117.7 kDa that consists of two homologous halves) is responsible for carbamoyl phosphate synthesis from NH3 and for the binding of the allosteric activators ornithine and IMP and of the inhibitor UMP. Elastase, trypsin, and chymotry…
The diffusion of deuterated toluene (d-toluene) from the vapour into glassy polystyrene has been studied using forward recoil spectrometry (FRES) over a range of temperatures (20–35°C) and d-toluene activities (0.10 to 0.35). At the highest d-toluene activity a Case II diffusion front is observed to form and propagate…
The Jahn‐Teller effect is shown to be the fundamental reason of the general distortion of the B12 icosahedra in molecular and crystalline structures. In consequence of the Jahn‐Teller effect the degeneracy of the upermost partly occupied energy level is lifted, and occupied and unoccupied states become separated. This…
Calculations and experiments applying voltage to a test cell simulating a high-resistance conducting path in series with a cavity in polyethylene are discussed. These experiments generated chemical changes on the surface wall of the cavities for both subcorona currents (currents produced by voltage below critical ince…
The efficient synthesis of three new vinylogous derivatives 6–8 of bis(ethylenedithio)tetrathiafulvalene (BEDT–TTF) is described; cyclic voltammetry establishes that the new donors have significantly lower solution oxidation potentials than that of BEDT–TTF, and the single crystal X-ray structure of compound 8 is desc…
The effects of chemisorbed sulphur on the hydrogen adsorption and evolution in aqueous acid solution are reviewed for well-controlled surfaces of platinum, nickel, iron and silver. The hydrogen underpotential adsorption (HUA) on platinum is poisoned by adsorbed sulphur. The hydrogen evolution reaction (HER) on Pt, Ni,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeneralized synthesis of cis- and trans-dioxorhenium(V) (bi)pyridyl complexesM. S. Ram and Joseph T. HuppCite this: Inorg. Chem. 1991, 30, 1, 130–133Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue 1 January 1991https://…
All articles of this category Sapphyrin, so called due to its intense blue-green color, is a 22 π-electron pentapyrrolic molecule known for over 20 years. This macrocycle can now be prepared in good yield and is becoming the subject of serious current study. Although planar and aromatic, the larger size of this "expan…
Abstract Plasma‐induced polystyrene radicals were first studied by electron spin resonance (ESR). The room temperature ESR spectrum was compared with those obtained by γ‐irradiation, UV‐irradiation, and mechanical fracture. It was found that even less than a few seconds of plasma‐irradiation gave rise to a large amoun…
The effects of remote nitrogen plasma, remote oxygen plasma, and corona discharge treatments on linear low-density polyethylene were studied with regard to the chemical and physical surface modification, depth of modification, and surface stability. An attempt was made to correlate the type and the extent of modificat…