Materials Literature
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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…
The microstructure and dielectric properties of lead magnesium niobate (PMN) ceramics containing the determental second phase, pyrochlore, have been studied. The pyrochlore phase within PMN was found to be present as isolated grains in the microstructure with a composition of Pb 2 (Mg 0.25 Nb 1.75 )O 6.625 and a prefe…
Complexes in which the Eu3+, Tb3+, and Gd3+ ions are encapsulated in the p-t-butylcalix[4]arene-tetra-acetamide ligand, (1) have been synthesized and their photophysical properties investigated; the Tb3+ complex exhibits a high luminescence quantum yield (0.2) and a long luminescence lifetime (1.5 ms) upon ligand exci…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPath-dependent morphologies of a diblock copolymer of polystyrene/hydrogenated polybutadieneRobert E. Cohen, P. L. Cheng, K. Douzinas, P. Kofinas, and C. V. BerneyCite this: Macromolecules 1990, 23, 1, 324–327Publication Date (Print):January 1, 1990Publication History Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrigonal-planar [M(SR)3]1- complexes of cadmium and mercury. Structural similarities between mercury-cysteine and cadmium-cysteine coordination centersEric S. Gruff and Stephen A. KochCite this: J. Am. Chem. Soc. 1990, 112, 3, 1245–1247Publication Date (Print):January 1, 199…
The use of specular reflection of X-rays to study the structure of the liquid/vapour interfaces along the direction normal to the surface is described. If RF(θ) is the theoretical Fresnel reflection law for X-rays incident on an ideal flat surface at an angle θ, and R(θ) is the measured reflectivity from the true surf…
The structure of thymidylate synthase (TS) from Escherichia coli was solved from cubic crystals with a = 133 A grown under reducing conditions at pH 7.0, and refined to R = 22% at 2.1 A resolution. The structure is compared with that from Lactobacillus casei solved to R = 21% at 2.3 A resolution. The structures are co…