Materials Literature
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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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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiffusion in strongly segregated block copolymersEugene HelfandCite this: Macromolecules 1992, 25, 1, 492–493Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 January 1992https://pubs.acs.org/doi/10.1021/ma00027a078http…
As part of our work with the use of silane coupling agents, we have been investigating the transformations of alkoxysilancs into siloxanes. The influence of a para-substituted phenyl group attached to the silicon was investigated and the rates of acid catalyzed hydrolysis and alcoholysis of these para-substituted phen…
Grain boundary segregation in Fe-3 mass%Si alloys doped with tin was investigated by Auger electron spectroscopy (AES), in order to shed light on a fact that tin addition modifies secondary recrystallization of Si steels. It was found that in decarburized specimens tin was segregated at grain boundaries and its segreg…
The thermodynamics of complex formation of lanthanide(III) ions with the neutral nitrogen-donor ligand ethylenediamine has been studied in the anhydrous aprotic solvent dimethyl sulfoxide at 25 °C and in an ionic medium, 0.1 mol dm–3 NEt4ClO4. The stability constants of the complexes and hence the free-energy changes…
Stainless steel AISI 304L, because of its satisfactory corrosion resistance, is widely used as a construction material for nitric acid service, particularly for nuclear fuel reprocessing plants. However, the presence of active inclusions (observed as end grain pitting II) makes the material susceptible to attack in ni…
Recently work rolls for cold rolling mill have been required for higher toughness because of remarkable progress in rolling mill, in addition, demands for higher wear resistance of rolls and lower damage of rolls in the accident of rolling have been increasing more and more. The new composite roll by the rotational el…
Fibers are the basic structure in yarns, and yarns are the basic structure for fabrics. Although the approach described can be applied easily and naturally to fibers, especially when dealing with composite-material fabrics, the applications presented are thought of primarily as yarn-based assemblies. Hence, when talki…
Mo2C was formed as a eutectic in the final stage of solidification of high Cr cast iron containing Mo. This finely dispersed carbide that is harder than Cr7C3 is expected to give good wear resistivity of hot rolls. The effect of addition of Mo up to 10 mass% in 3mass%C-20mass%Cr iron was investigated. With increasing…
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Tolbutamide (TBM) agglomerated crystals were prepared by three spherical crystallization techniques, the solvent change (SC) method, neutralization (NT) method and quasi-emulsion solvent diffusion (QESD) method (SC-A, SC-B, NT and QESD) agglomerated crystals), followed by mixture with a disintegrating agent and a lubr…
The prevailing zirconia modification in a series of metal/ZrO2 catalysts has been investigated by Raman spectroscopy. Activation of an amorphous Cu70Zr30 alloy, or coprecipitation of zirconium dioxide with either copper, nickel or silver oxides at constant pH results in amorphous solids containing varying fractions of…