Materials Literature
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We have performed extensive simulations of liquid carbon at various densities, using a highly transferable tight-binding model of carbon. In contrast to some recent theoretical suggestions, we show that the low-density liquid is primarily twofold bonded. Such a bonding arrangement leads to a low conductivity, compared…
High-resolution, magic-angle-spinning (MAS), 29Si NMR spectra have been obtained for a sodium silicate glass and liquid (60 mol% Si02) to temperatures over 600 °C. Crystallization was monitored in situ, and motional averaging of the peaks for distinct silicate anionic species (Q2 and Q3 species) in the liquid was obse…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAromatic Cyclolinear Phosphazene Polyimides Based on a Novel Bis-Spiro-Substituted Cyclotriphosphazene DiamineDevendra Kumar and Alka D. GuptaCite this: Macromolecules 1995, 28, 18, 6323–6329Publication Date (Print):August 1, 1995Publication History Published online1 May 200…
Electron-irradiated specimens of linear polyethylenes, aged at ambient conditions for periods between 79 and 112 months, were examined by electron spin resonance spectroscopy (ESR). Free radicals were found in all irradiated specimens, spin concentrations ranging from 0.5 × 1016 spins/g to 3.5 × 1016 spins/g and being…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTContribution of the Crazing Process to the Toughness of Rubber-Modified PolystyreneArminda M. L. Magalhaes and Rein J. M. BorggreveCite this: Macromolecules 1995, 28, 17, 5841–5851Publication Date (Print):August 1, 1995Publication History Published online1 May 2002Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Novel Dimanganese(III) Complex with a Single Hydroxo Bridge. Syntheses, Structures, and Magnetic Susceptibilities of (.mu.-Hydroxo)bis((octaethylporphinato)manganese(III)) Perchlorate and a Monomeric Precursor, Aquo(octaethylporphinato)manganese(III) PerchlorateBeisong Che…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparison of Chemically and Electrochemically Prepared Polyaniline Films. 2. Optical PropertiesDouglas Chinn, Joel DuBow, Jing Li, Jiri Janata, and Mira JosowiczCite this: Chem. Mater. 1995, 7, 8, 1510–1518Publication Date (Print):August 1, 1995Publication History Published…
Experimental data on the temperature and electric field dependence of the tilt angle and the electroclinic effect of the smectic-${\mathit{C}}^{\mathrm{*}}$ (Sm-${\mathit{C}}^{\mathrm{*}}$) and the smectic-${\mathit{A}}^{\mathrm{*}}$ (Sm-${\mathit{A}}^{\mathrm{*}}$) phases are presented which have been obtained by ele…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChanges in Geometries and Spin States of Thiolato-Schiff Base NiN2S2 Complexes Containing N,N'-Biphenyl BackbonesHenrik Frydendahl, Hans Toftlund, Jan Becher, Jennifer C. Dutton, Keith S. Murray, Lucille F. Taylor, Oren P. Anderson, and Edward R. T. TiekinkCite this: Inorg.…
Several transition metal carbides were examined as anodes for the internal direct‐oxidation of carbon in solid oxide fuel cells. Observed values of open‐circuit voltage of carbide anode cells were found to be in the same order as the oxygen potentials calculated for the respective metal carbide/metal oxide equilibrium…
Using the technique of hydrogen and deuterium substitution, the structure of water in concentrated lithium chloride aqueous solutions (LiCl⋅6H2O) is explored for the liquid, supercooled liquid, and glass states. It is found that changes in structure between the glass and supercooled states are minor, but that a major…
Scattering and absorption coefficients are presented from Monte Carlo simulations of electromagnetic wave propagation in a volume of densely packed, random dielectric, absorptive spheres. The particles are modeled both with and without a surface adhesion that causes them to form clustered groups. Results for scatterer…
Poly-β-hydroxybutyrate biosynthesis was studied in Alcaligenes eutrophus under various nutrient-limiting conditions. When the cells were cultivated in nitrogen-limited media, both the levels of NAD(P)H and the ratios of NAD(P)H/NAD(P) were higher than those under nitrogen-sufficient conditions. The specific poly-β-hyd…
Abstract Previous studies on one soil showed that silicone polymer (polydimethylsiloxane, or PDMS) degrades to dimethyl-silanediol (DMSD). This study examines PDMS degradation on seven U.S. soils differing in pH, % organic matter, texture, mineralogy, and geographic origin. Moist soils were amended with 350-centistoke…
Incorporation of La 3+ into the BaTiO 3 lattice was studied on samples of various composition, using quantitative WDS microanalysis (EPMA) in combination with scanning electron microscopy (SEM) and X‐ray powder diffractometry (XRPD). Direct determination of solid‐solution formulas by microanalysis supports the structu…
▪ Abstract The phase-field method has recently emerged as a powerful computational approach to modeling and predicting mesoscale morphological and microstructure evolution in materials. It describes a microstructure using a set of conserved and ...Read More
The growth of single crystal β‐silicon nitride fibers (see Figure) several millimeters long through the application of self‐propagating high‐temperature synthesis is demonstrated. Advantages include the igh purity of the fibers obtained, the fact that the fibers are stable up to 2000°C, and the low cost of the SHS pro…
Abstract Fixed‐bed reactors with periodic flow reversal are used to carry out reactions with low exothermicity in an autothermal way. Contrary to conventional autothermal reactors, the preheating of the feed gas is accomplished by regenerative heat exchange between the gas and fixed bed. The feedback of heat and direc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleMechanistic Role of H2O and the Ligand in the Chemical Vapor Deposition of Cu, Cu2O, CuO, and Cu3N from Bis(1,1,1,5,5,5-hexafluoropentane-2,4-dionato)copper(II)Jiri Pinkas, John C. Huffman, David V. Baxter, Malcolm H. Chisholm, and Kenneth G. CaultonCite this: Chem. Mater. 1995,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(alkyl thiophene-3-carboxylates). Synthesis and Characterization of Polythiophenes with a Carbonyl Group Directly Attached to the RingMartin Pomerantz, Hui Yang, and Yang ChengCite this: Macromolecules 1995, 28, 17, 5706–5708Publication Date (Print):August 1, 1995Publica…