Materials Literature
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The use of surface coatings, which are applied to the hot-end components of the modern gas turbine to protect against oxidation and/or corrosion, is commonplace and the correct choice of coating process is a balance between cost effectiveness, operational environment and lifetime. This paper reviews a broad range of c…
In situ neutron reflectivity measurements on potentiodynamically deposited polybithiophene (PBT) films on Pd electrodes supported on quartz are described. The contrast-variation method allows determination of polymer film structure with high resolution perpendicular to the electrode surface. Both undoped and p-doped P…
The paper describes digital-processing techniques for determining the pore-size distribution in a fabric. A magnified image of a sample of fabric is captured by a video camera, and the image is processed to determine pore-size distributions according to three definitions. The sizes of the pores in a fabric to be used…
We report on measurements of the specific heat and thermal diffusivity of Pyrex 7740 glass for temperatures between 20 and 310 K. The thermal conductivity was determined from the measured quantities. Our results are compared with theoretical predictions for glasses.
Abstract A polycyclic Terra Rossa (Chromic Cambisol on Rhodic Nitisol) was studied with the aim of characterizing pedogenetic processes and relating the most evolved term of a previously defined catena with its parent material. Results obtained by field, chemical, micromorphological, sedimentological and mineralogical…
If a wool fabric is restrained during drying, as in tentering, there is a close relationship between the relaxation shrinkage that is induced and the hygral expansion. A high correlation also exists between the hygral expansion and extensibility of relaxed fabrics. For conventional woven fabrics, this relationship is…
The difference spectra in the mid-infrared region associated with oxidation of the porphyrin ring in 5,10,15,20-tetraphenylporphyrin complexes of MnIII, FeIII and CoIII have been obtained by in situ Fourier-transform infrared spectroelectrochemistry, and are compared to those similarly observed for the corresponding m…
Conduction currents and thermally stimulated discharge (TSD) currents were studied in aramid paper at various field strengths and temperatures. At low field strengths the conductivity is ohmic, and at higher field strengths (up to 30 MV/m), ionic conduction is a possible mechanism. The activation energy of low field c…
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…