Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn x-ray crystallographic and high-field NMR study of chromium complexes [(C6Et6)Cr(CO)2NO]+BF4- and [(C6Et6)Cr(CO)(CS)NO]+BF4-: steric inhibition of tripodal rotationBavani Mailvaganam, Christopher S. Frampton, Siden Top, Brian G. Sayer, and Michael J. McGlincheyCite this:…
Abstract Selective Catalytic Reduction (SCR) has been applied as a NOx abatement technique for stationary sources of nitrogen oxides (NOx) in Japan since the early 1970s. To date, there are over 100 SCR installations operating in Japan. During the 1980s, a number of SCR systems have been installed in the United States…
Planar impact experiments were employed to induce dynamic tensile failure in Bedford limestone. Rock discs were impacted with aluminum and polymethyl methacralate (PMMA) flyer plates at velocities of 10 to 25 m/s. Tensile stress magnitudes and duration were chosen so as to induce a range of microcrack growth insuffici…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDinuclear complexes of copper(II) derived from (1,3-propanediylbis(oxamato))cuprate(II): magneto-structural correlationsJoan Ribas, Auxiliadora Garcia, Ramon Costa, Montserrat Monfort, Santiago Alvarez, Claudia Zanchini, Xavier Solans, and Maria Victoria DomenechCite this: I…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of deactivation of methylation of toluene over H-ZSM-5 and hydrogen mordenite catalystsRamakrishna Mantha, Subhash Bhatia, and Musti S. RaoCite this: Ind. Eng. Chem. Res. 1991, 30, 2, 281–286Publication Date (Print):February 1, 1991Publication History Published onli…
Through controlled thermal decomposition of cobalt acetate tetrahydrate, cobalt monoxide can be synthesized with three different crystal structures: rock salt, zinc blende, and wurtzite. Using electron microscopy techniques, it is shown that the polymorphs exhibit characteristic crystallite morphologies; “tetrahedral”…
Abstract In an attempt to understand the fatigue crack initiation and growth behavior of planar slip alloys, studies have been carried out in strain control on Cu‐16 at.% A1 single crystals oriented for easy glide. Alloy single crystals of Cu‐16 at.% A1 do not show saturation like copper crystals, but harden slowly an…
Abstract The reactions of an epoxy prepolymer based on bisphenol A diglycidylether (DGEBA) with γ‐aminopropyltriethoxysilane (γ‐APS) are studied. The results of different techniques are compared: size exclusion chromatography, differential scanning calorimetry, chemical titration, and Fourier Transform Infrared absorp…
The conformation of perindoprilat, an antihypertensive drug, is studied in the solid state by X-ray analysis. The resolution of its structure reveals important analogies between its observed conformation and that of several ACE inhibitors of the same family. This comparison points out a constant relative orientation o…
Thin films of Sr0.6Ba0.4Nb2O6 on silicon and fused silica substrates have been prepared by the sol-gel method. The dense, transparent, and crack-free films were fabricated by the dipping and then firing at a temperature of 700 °C. Ferroelectric properties were confirmed by P-E hysteresis loops. The refractive index an…
The experimental results of an investigation of a chemical (alloying) and a physical (deformation) method for refining the microstructure of duplex stainless steels are described. The chemical technique involves alloying with copper. When 3 wt-%Cu is added to a 30Cr–8Ni steel, it was found that the copper precipitatio…
Abstract Poly(methyl methacrylate) (PMMA) is a brittle material which can be reinforced by the incorporation of acrylic particles, which do not spoil the transparency but which considerably increase the toughness of the material. In that study, we have varied the particle size and the outer layer for anchoring with th…
A highly sensitive capacitance-change technique, suitable for thin polymer films, has been developed for the measurement of the coefficient of thermal expansion (CTE) in the film-thickness direction. Using this technique, we have determined the thickness-direction CTE of Kapton polyimide to be about 81±4 ppm/°C, avera…
Abstract The selection of functions to represent XPS lineshapes is discussed. An improved Lorentzian/Gaussian product function is proposed for fitting symmetrical XPS peaks, and a further empirical modification is shown to represent asymmetric (metallic) XPS peak profiles very closely. One additional parameter sets th…
C 24 H 36 O 4 cristallise dans P2 1 2 1 2 1 avec a=7,193, b=15,208, c=19,277 A, Z=4; affinement jusqu'a R=0,049. C 24 H 34 O 4 cristallise dans P2 1 avec a=6,370, b=12,072, c=13,024 A, β=99,87°, Z=2; affinement jusqu'a R=0,040. C 23 H 34 O 5 . CH 3 OH cristallise dans P2 1 2 1 2 1 avec a=16,678, b=13,332, c=10,063 A,…
We have carried out extensive computer simulations of the Lebwohl-Lasher model of a nematic liquid crystal to determine the Frank elastic constant K for this system as a function of temperature. We use equilibrium, k-dependent, fluctuation expressions, valid at small wave vector k, and also measure the response to app…
The damage structures produced in Ni by heavy-ion irradiations with 50 keV Kr+ and 50 and 100keV Ni+ ions have been studied as a function of irradiation temperature (30 and 300K) and ion dose (1015–1017 ions m-2). Both irradiations and electron microscopy were performed in the HVEM-Accelerator facility at Argonne Nati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUV-visible diffuse reflectance spectroscopic study of platinum, palladium, and ruthenium catalysts supported on silicaT. Lopez, M. Villa, and R. GomezCite this: J. Phys. Chem. 1991, 95, 4, 1690–1693Publication Date (Print):February 1, 1991Publication History Published online…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBinding of lead(II), antimony(III), and other isoelectronic main-group ions to iridium in the metallomacrocycle Ir2(CO)2Cl2{.mu.-(Ph2PCH2)2AsPh}2Alan L. Balch, Vincent J. Catalano, Mark A. Chatfield, Jeffrey K. Nagle, Marilyn M. Olmstead, and Phillip E. Reedy Jr.Cite this: J…
Shewanella colwelliana, a marine bacterium which grows in association with oysters, has been found to produce an unusual extracellular polymer which mediates irreversible adhesion of the bacterium to surfaces. Production of the polymer was enhanced when the bacterium was grown on marine agar, overlaid with a dialysis…