Materials Literature
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The synthesis and characterization of a new series of mono-, di-, and trinuclear Cr(II) borohydride compounds is described. The reaction of CrCl 2 (TMEDA) with two equivalents of NaBH 4 afforded the thermally unstable (TMEDA)Cr(BH 4 ) 2 (1), which was converted by treatment with pyridine into the octahedral monomeric…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntramolecular Pyrene Excimer Probing the Sol-Gel ProcessL. M. Ilharco, A. M. Santos, M. J. Silva, and J. M. G. MartinhoCite this: Langmuir 1995, 11, 7, 2419–2422Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Published inissue 1 July 1995h…
A high-pressure X-ray diffraction study has been performed on a perfect icosahedral Al62Cu25·5Fe12·5 (i-(Al—Cu—Fe)) phase at room temperature up to 33·5 GPa using a diamond-anvil cell to determine the equation of state. X-ray diffraction was undertaken in energy-dispersive mode on a synchrotron beam line. The remarkab…
When subjected to severe thermal shock, ceramics suffer strength degradation due to the damage caused by the shock. A fracture‐damage analysis is presented to study the effects of damage on the thermal shock behavior of ceramics. It is assumed that a narrow strip damage zone is developed at the tip of a preexisting cr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Properties of New Polyamides Based on DiamantaneYaw-Terng Chern and Wen-Liang WangCite this: Macromolecules 1995, 28, 16, 5554–5560Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Published inissue 1 July 1995https://pubs.acs.o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDimetal Hepta- and Octaalkoxide Anions of Molybdenum and Tungsten, M2(OR)7- and M2(OR)82- (M.tplbond.M). Preparation, Structures, Oxidation, and a Study of the Thermal Decomposition of W2(OR)7- to Give W2(H)(O)(OR)6- Where R = tBu and iPrT. A. Budzichowski, M. H. Chisholm, K…
The thermal expansion coefficients and glass transition temperatures of Y‐Mg‐Si‐Al‐O‐N glasses were measured using dilatometry. The thermal expansion coefficients of these glasses could be calculated on the basis of composition, using experimentally determined thermal expansion prefactors .
Three-dimensional textiles are those materials which have a system or systems in all the three axes of plane. These offer particular properties, such as interlaminar shearing force, and mechanical and thermal stability along all three axes of space, which are not achievable with other reinforcements. The demand for th…
For many years, the petroleum industry has employed martensitic stainless steels for wellhead and valve applications, and increasing use has been made of 13%Cr-4%Ni alloys. This material type was originally developed as a cast alloy (e.g., ASTM A487/A487M-89a Grade CA6NM). The combination of a low-carbon content and t…
Abstract Double yield points before necking were observed in injection molded specimens of poly(tetramethylene terephthalate) (PTMT) and its copolymers under tensile loading. The first yield is associated with deformation of the amorphous region and the second yield is caused by the alpha to beta transition of PTMT cr…
The fact that mercury is released from dental amalgam restorations after abrasion provides a source of continued controversy over the safe use of this material. Studies have shown that the amount and rate of mercury release vary for different amalgam products. The objective of this study was to determine how alloy com…
The Curie temperature of dysprosium films epitaxially grown on yttrium and on erbium is shown to increase continuously with the epitaxial strain induced along the c -axis. This variation is correlated to modifications of the α strains, of the γ distortion and of the exchange energy barrier. The evolution of these diff…
Using an expanding cascaded arc plasma jet, amorphous hydrogenated and fluorohydrogenated carbon films were deposited on silicon, glass, and steel substrates at high rates of tens of nanometers per second and on large areas of up to 100 cm2. The present work was aimed at depositing amorphous carbon films suited for op…
Higly disperse copper oxides are widely used as catalysts for industrial processes, for example in methanol synthesis. The supports used for these catalysts hamper their characterization of the copper oxide species involved. Here, a procedure for the preparation of unsupported, nanostructured, and pure Cu 2 O samples…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Complexation Studies of Regioisomers and Conformational Isomers of p-tert-Butylcalix[4]arene Bearing Pyridine or Pyridine N-Oxide Pendant Groups at the Lower RimSebastiano Pappalardo, George Ferguson, Placido Neri, and Concetta RoccoCite this: J. Org. Chem. 199…
Abstract Serpentine soils show high contents of Cr and Ni. Acidification may convert the metals bound in silicate structures into bioavailable forms. The effects of mineral acids on a serpentine‐derived Typic Hapludoll were examined in column studies. Cadmium and Pb were also examined. One end of the soil‐packed colum…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn Unsymmetric Trinuclear Chromium(III) Oxo Carboxylate Assembly: Structure and Characterization of Cr3O(O2CPh)4(8-hqn)3.cntdot.1.25CH2Cl2Maysa K. Nagi, Anthony Harton, Scott Donald, Young-Sook Lee, Michal Sabat, Charles J. O'Connor, and John B. VincentCite this: Inorg. Chem…
The tip of a scanning tunneling microscope (STM) was used to inject electrons into thin Pt layers of metal–oxide–semiconductor (MOS) structures. The collector currents emanating from the n-type Si(100) substrates were measured as a function of the electron energy, determined by the STM tip bias VT, for different oxide…
We have performed a molecular dynamics computer simulation study to investigate the dynamical behavior of a supercooled simple liquid for comparison with the predictions of mode-coupling theory (MCT). By scaling the intermediate scattering function by the α-relaxation time r we find that the correlators fall onto a ma…
Reusable, oxidation-protected reinforced carbon-carbon has been successfully flown on all Shuttle Orbiter flights. Thermal testing of the silicon carbide-coated, reinforced carbon-carbon to determine its oxidation characteristics has been performed in convective (plasma Arc-Jet) heating facilities. Surface sealant mas…