Materials Literature
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There is still some debate on the extent of plasticity of oxide scales at high temperatures. Examination of scales after creep of the substrate often shows that at higher strain rates scale cracks are visible after only very low strains (brittle behaviour), whereas at low strain rates no scale cracks are observed afte…
The ellipsometric measurement of refractive indexes for films less than 50 nm thick is of dubious quality due to the significance of the size of random errors relative to the accuracy required to extract reliable index values from the measurements. In this study the various errors are quantitatively assessed as a func…
A fiber-optic system was developed for exciting and collecting surface-enhanced Raman scattering (SERS) signals generated from a sensing plate tip having silver-coated microparticles deposited on a glass support. Various fiber parameters, such as fiber type, fiber-substrate geometry, and other experimental parameters,…
The synthesis, structural characterization and electrical conductivity measurements of α-,β-[(CH3)4N][Pd(dmit)2]2 and [(CH3)4As][Pd(dmit)2]2 are reported. They have similar crystal structures made of stacked Pd(dmit)2 dimers. The mode of the intra-dimer molecular overlapping is that of the eclipsed type. Pd atoms devi…
Two new charge-transfer salts [bettf]2[FeCl4](1) and [bettf][FeBr4](2) have been prepared and crystallised electrochemically [bettf = bis(ethylenedithio)tetrathiafulvalene]. The crystal structures of both salts have been refined in the P space group, the unit-cell parameters being: (1), a= 6.626(2), b= 15.025(2), c= 1…
Recent advances in the methods of structural analysis, in particular the use of particle accellerators to produce pulsed neutrons and synchrotron radiation, have greatly improved our ability to describe the atomic structure of non-periodic matter quantitatively using the atomic pair distribution analysis, or the real-…
Abstract Thin plasma polymerized layers of acrylic acid (PPAA) were deposited onto polyethylene and muscovite mica surfaces. Structure and surface properties of the deposited layer depend on the polymerization conditions. The content of carboxylic groups in the layer decreases, whereas the degree of crosslinking or br…
The characteristics of the high energy product NdFeB magnets obtained by the powder metallurgy route have been improved by appropriate vanadium additions. Specific combinations of V and Co lead to an intrinsic coercive force of about 1350 kA/m (17 kOe) in Dy-free magnets, without any large decrease of remanence. If 1.…
Plasma treatment of ultra-high strength polyethylene (UHSPE) fabric using ammonia gas to implant surface amine groups was investigated. The effects of three treatment times and three treatment powers were studied. After treatment, the wettability of UHSPE fabric was found to increase dramatically, becoming completely…
Abstract Variant of the serine protease, subtilisin BPN′, in which the catalytic triad residues (Ser‐221, His‐64, and Asp‐32) are replaced singly or in combination by alanine retain activities with the substrate N ‐succinyl‐ L ‐Ala‐ L ‐Ala‐ L ‐Pro‐ L ‐Phe‐ p ‐nitroanilide (sAAPF‐ pna ) that are at at least 10 3 to 10…
Abstract This paper presents the predictions of a hybrid model of fabric development in quartzites that combines aspects of previous models based on lattice rotations and dynamic recrystallization. The input parameters for the model have been systematically varied in order to investigate changes in deformation fabrics…
A supported Mn–porphyrin catalyst has been prepared by immobilisation of the tetracationic Mn [meso-tetra (4-N-methylpyridiniumyl)porphyrin]Cl4+ on montmorillonite, and is found to be efficient for alkene epoxidation and alkane hydroxylation by PhlO, with a higher ability to oxidize alkanes, and in particular short li…
A progress report is given on recent experimental studies of core excitation and inoization of free-molecules in the VUV and soft x-ray (50 to 2600 eV) by electron impact and x-ray photoabsorption (XAS) techniques. The current capabilities of inner shell electron energy loss spectroscopy (ISEELS) and XAS for gas phase…
The overlayer method for determining the attenuation length was simulated by the Monte Carlo method. The theoretical model was based on the elastic scattering cross sections resulting from the partial wave expansion method. Multiple elastic electron collisions in the solid were considered. Calculations were made for M…
Amorphous, hydrogenated carbon (AHC) films can be deposited on various substrates using several techniques, e.g. plasma deposition and ion beam deposition. The resulting films can be hard, wear resistant and transparent.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal isomerization behaviors of a spiropyran in bilayers immobilized with a linear polymer and a smectitic clayTakahiro Seki and Kunihiro IchimuraCite this: Macromolecules 1990, 23, 1, 31–35Publication Date (Print):January 1, 1990Publication History Published online1 May…
Abstract Extrusion measurements have been carried out on blends of nylon 6 and a liquid‐crystalline copolyesteramide (LCP). The flow curves at low temperature show a behavior similar to that of pure LCP with a rapid rise of the viscosity at low shear rates. At high shear rates the viscosity is lower than that for each…
The structure of adsorbed polymer layers has been studied extensively, both experimentally and theoretically, in a diverse range of systems. Although the form of the volume-fraction profile of polymer segments, normal to the interface has been predicted in detail from theory, few experimental methods can probe more th…
G. Reid and M. Schröder, Chem. Soc. Rev., 1990, 19, 239 DOI: 10.1039/CS9901900239
Abstract Perovskite-type oxides showed the catalytic activity for NO decomposition above 773 K, which depended largely on constituent metal cations and their composition. Results obtained indicate that perovskite-type oxides such as La0.8Sr0.2CoO3 are a promising NO decomposition catalyst having high activity and ther…