Materials Literature
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Abstract We propose an improved general method for the synthesis of tetrathiafulvalene and its methylated derivatives. TTF is obtained in a five steps preparation offering a high Overall yield. Concerning the unsymmetrically methylated tetrathiafulvalenes, four different procedures are analysed. It is shown the best r…
The surface of an aromatic moisture-cured urethane (ArMCU) and the steel-ArMCU interface have been studied using XPS. Study of the interface after failure showed that iron was present in the polymer and nitrogen from the ArMCU was detected on the steel surface after failure. This suggests a failure within a chemical i…
Fe3(PO4)2, sarcopside, displays unusual magnetic properties which have been investigated using time-of-flight powder neutron diffraction and magnetic susceptibility measurements. The structure contains chains of three edge-shared FeO6 octahedra with two inequivalent iron sites, the central M(1) site possessing a fairl…
The shear viscosities of l3 silicate liquids along the NarSiOr-TiO, and CaSiOr-TiO, joins as well as six liquids based on the sphene stoichiometry X#TiSiO. (where X represents Li, Na, K, Rb, Cs, Ca, and Sr) have been measured in equilibrium with air using the concentric cylinder method. The NarSiOr-TiO, join was inves…
Description 39 papers by researchers working with stabilization and solidification technologies from both the low-level radioactive and chemically hazardous waste communities are presented in sections on: • Regulatory and Technical Guidance • Specialty Wastes: Organics, Ashes, and Resins • Laboratory-Scale Leachabilit…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
For non-degenerate ground-state polymers such as polypyrrole, it has been shown by other authors that radical cations (polarons) and dications (bipolarons) are the species responsible for their electronic conduction. The evolution of these species with electrode potential and doping level has also been considered in p…
The reactivity of several vinyl porphyrins towards singlet oxygen (1O2) in various solvents has been investigated using time-resolved detection of infrared luminescence at 1270 nm. The porphyrins studied are derived from deuterioporphyrin through 2- or 4-substitution. The singlet-oxygen quenching constant, kp, is foun…
2014 Des tudes de pertes d'nergie d'lectrons effectues en microscopie lectronique moyenne et haute tension nous ont permis de mettre en vidence les modulations EXELFS sur les dis- tributions associes aux excitations du niveau atomique K des lments de faibles numros atomiques (Z ~ 16). Ces modulations constituent une s…
Both real and imaginary parts of the second-order non-linear optical coefficients for a wide range of new organic conjugated materials have been measured. The technique of electric-field-induced second-harmonic generation to determine the optical non-linearity is described for materials highly absorptive at the harmon…
A tetraazamacrocycle from three pyrrole units and a condensed furan ring—“furochloro-phin”—surrounds the NiII ion in 1. This 18π electron system with a basic chlorin structure is formed surprisingly easily from the thermolysis of (octadehydrocorrinato)nickel(II) chloride. This synthesis will probably not only provide…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular precursors to boron nitride thin films. 1. Adsorption of diborane on ruthenium(0001), ammonia/ruthenium(0001), and oxygen/ruthenium(0001) surfacesJose A. Rodriguez, Charles M. Truong, Jason S. Corneille, and D. Wayne GoodmanCite this: J. Phys. Chem. 1992, 96, 1, 33…
A number of procedures for cleaning the surface of steel have been tested. By washing with different solvents, ultrasonic solvent cleaning, sand-blasting or grinding, and desorption of organic contamination in an oxygen plasma, the degree of cleaning increased successively, as detected by XPS. The adhesion of polyuret…
Abstract A series of mono-, bis-, and trissubstituted pyridinium and pyrylium dyes have been synthesized by the condensation of methylpyridinium and methylpyrylium salts with aldehydes or nitroso compound. Large bathochromic shifts were observed in the following order, both in substituted azomethine pyridinium and pyr…
FeIII tetraphenylporphyrin chloride (FeCITPP) has been pyrolysed at different temperatures (450–850 °C) for different lengths of time (10–260 min). Some of the samples were mixed with carbon black in a 50/50 (w/w) proportion. Mössbauer spectra were obtained for these catalyst powders. The spectra reveal a number of di…
Imaging static secondary-ion mass spectroscopy (SIMS) has been used to investigate the surface morphology of PVC/PMMA blends cast from tetrahydrofuran. The established morphology of the bulk was found to extend to the surface.
Molecular modelling procedures have been used to determine statistical parameters of isolated chains, with the objective of achieving a simple description which defines the tendency of a molecule to form a liquid-crystalline phase, its mesogenicity. Initial attention is focused on the persistence length parameter as t…
Abstract Blends of poly (vinyl chloride) (PVC) and acrylonitrile‐butadiene styrene (ABS) terpolymer were prepared in different ratios by a melt blending technique. ABS containing three different levels of rubber content were used. A quantitative assessment of ABS in PVC/ABS blends has been shown by infrared studies. A…
The conditions for the onset of thermal runaway in partially insulated or cooled reactors are investigated. The temperature in the reactor is taken to satisfy a nonlinear elliptic equation and the reaction is modelled by an Arrhenius heat generation term with finite activation energy. To determine the onset of thermal…
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