Materials Literature
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Abstract New stability constant data are presented for the minerals blixite, mendipite and the compound Pb 7 O 6 Cl 2 .2H 2 O at 298.2 K and P = 10 5 Pa. Mendipite is in fact a metastable phase at this temperature, being thermodynamically stable under the appropriate conditions at temperatures above about 29°C Kinetic…
Single crystals of the quasi-one-dimensional conductor (perylene)Co-bis(maleonitriledithiolate)(CH2Cl2)0.5 were prepared by electrocrystallization. The structure at room temperature is incommensurate with modulation wave vector (0.22a*, -0.13b*, -0.36c*). At T = 295 K it crystallizes in space group P1BAR with Z = 2 an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBond-stretch isomerism in the chlorooxomolybdenum complexes cis-mer-MoOCl2(PR3)3: a reinvestigationKeum Yoon, Gerard Parkin, and Arnold L. RheingoldCite this: J. Am. Chem. Soc. 1992, 114, 6, 2210–2218Publication Date (Print):March 1, 1992Publication History Published online1…
Morphol., lamellar thickening, and the transition between the crystal and the hexagonal columnar phase were studied in 1,4-trans-polybutadiene (I) by optical and electron microscopy, time-resolved synchrotron x-ray diffraction, and DSC. I could form several-thousand-.ANG.-thick lamellas of the extended or nearly exten…
Abstract Shale samples ranging in depth from 305 m to 3658 m (Miocene to Late Cretaceous) from a single well in DeWitt County, Texas were examined by x-ray diffraction (XRD), scanning-transmission electron microscopy (STEM), and analytical electron microscopy (AEM) techniques to detail the mineralogical, textural, and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and characterization of an A1u (Oxo) iron(IV) porphyrin .pi.-cation-radical complexHiroshi Fujii and Kazuhiko IchikawaCite this: Inorg. Chem. 1992, 31, 6, 1110–1112Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Published iniss…
Abstract Thermal characterization was carried out on highly stereoregular and regioregular syndiotactic polypropene (sPP) obtained with isopropylidene(cyclopentadienyl)(9‐fluorenyl)zirconium dichloride and methylaluminoxane. The influence of molecular weight and syndiotacticity degree on the thermodynamic melting poin…
The mechanism by which cAMP-dependent protein kinase-catalyzed phosphorylation modulates the activities of 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase was examined after site-specific mutation of the cAMP-dependent phosphorylation site (Ser32) to aspartic acid or alanine. The mutant and wild-type enzymes were…
Abstract Conventional batch adsorption‐isotherm experiments are conducted under conditions that are generally not representative of field conditions. Our objective was to develop and illustrate a technique that uses continuous, unsaturated flow through intact soil cores and gives information analogous to standard batc…
Abstract Both Lewis and Brönsted acid sites were found on the surface of TiO2–SiO2 mixed oxide, thouth no Brönsted acid sites were detected on the surface of pure TiO2 and SiO2. While on the surface of TiO2–Al2O3 mixed oxide, no Brönsted acid sites were generated. The rate of isomerization of 1-butene was found to be…
The results of Anthony et al. [Phys. Rev. B 42, 1104 (1990)] on the thermal conductivity at 25 \ifmmode^\circ\else\textdegree\fi{}C of diamonds grown with a reduced $^{13}\mathrm{C}$ concentration are analyzed. The effect of reducing the $^{13}\mathrm{C}$ concentration is about ten times greater than these authors exp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface chemistry of colloidal silver: reduction of adsorbed cadmium(2+) ions and accompanying optical effectsArnim Henglein, Paul Mulvaney, Thomas Linnert, and Arnold HolzwarthCite this: J. Phys. Chem. 1992, 96, 6, 2411–2414Publication Date (Print):March 1, 1992Publication…
We have prepared Si1−yCy alloy layers on Si (001) substrates using solid-source molecular-beam epitaxy. The lattice mismatch between diamond and Si is about 50%. Thus, a Si1−yCy (y=0.02) alloy has a mismatch of about 1% with respect to Si assuming Vegard’s law. Transmission electron microscopy (TEM) shows the layers t…
We have studied the structural properties and electronic structure of a hypothetical, all-${\mathit{sp}}^{2}$ phase of carbon using the first-principles pseudopotential total-energy method. The phase, called bct-4 C, is found to be a low-compressibility metal. Because of the nearly perfect lattice match with the diamo…
Using a split-valence Gaussian 4-31G basis function augmented with diffuse p and d function and multiconfiguration self-consistent-field optimized geometries, the frequency-dependent polarizability \ensuremath{\alpha} and second hyperpolarizability \ensuremath{\gamma} of ethylene, trans-butadiene, trans-hexatriene, an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of defects on the luminescence quantum yield of yttrium europium oxide (Y1.94Eu0.06O3)W. Van Schaik and G. BlasseCite this: Chem. Mater. 1992, 4, 2, 410–415Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Published inissue 1 March…
In this paper certain fundamental concepts underlying the phenomenological theories of elastic-plastic deformations at finite strains and rotations are presented, and some of the commonly discussed theories are summarized, emphasizing the constitutive parameters which influence strain localization and material instabi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the observation of a new morphology in poly(arylene ether ether ketone). A further examination of the double endothermic behavior of poly(arylene ether ether ketone)Herve Marand and Abaneshwar PrasadCite this: Macromolecules 1992, 25, 6, 1731–1736Publication Date (Print):…
Trivalent erbium ions in ${\mathrm{CsCdBr}}_{3}$ exist predominantly as dimers along one-dimensional lattice chains. Very efficient upconversion from near-infrared to various visible wavelengths was observed. $^{2}$${\mathit{H}}_{9/2}$${\ensuremath{\rightarrow}}^{4}$${\mathit{I}}_{15/2}$ (414 nm) and $^{4}$${\mathit{F…
We consider a strongly anisotropic three-dimensional conductor in a magnetic field perpendicular to the most conducting direction. We show that the magnetoresistance exhibits a series of resonance like dips when the magnetic field takes particular angles in the b-c plane where periodic motion in the b and the c direct…