Materials Literature
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The syntheses and crystal structures of the following paratungstates-Z with different alkaline cations are reported and discussed: Na 10 [H 2 W 12 O 42 ] · 20H 2 O (I), Na 10 [H 2 W 12 O 42 ] · 27H 2 O (II), Na 10 [H 2 W 12 O 47 ] · 28H 2 O (III), K 10 [H 2 W 12 O 42 ] · 10H 2 O (IV), K 6 Na 4 [H 2 W 12 O 42 ] · 13H 2…
Thin films often exhibit a spontaneous breaking of chiral symmetry. This symmetry breaking can occur on two distinct length scales. On a microscopic scale, nonchiral molecules can pack in a chiral structure. On a macroscopic scale, a striped texture can buckle to form a spiral. Using continuum elastic theory and Monte…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Structural Characterization of Reduced Ternary Tantalum Oxides in the Tetragonal Tungsten Bronze StructureChristopher R. Feger and R. P. ZiebarthCite this: Chem. Mater. 1995, 7, 2, 373–378Publication Date (Print):February 1, 1995Publication History Published on…
We have quantitatively measured the temperature dependence of the local distortions of PbTiO3, crystals below and above the structural ferroelectric phase transition using X-ray Absorption Fine Structure (XAFS) measurements. Both Pb and Ti edges were measured, providing quantitative determinations of the displacements…
The field-induced spin-density-wave state in (TMTSF${)}_{2}$${\mathrm{ClO}}_{4}$, where TMTSF is tetramethyltetraselenafulvalene, develops because the field diminishes the ``antinesting'' terms, ${\mathit{t}}_{\mathit{b}}^{\mathcal{'}}$, to restore the spin-density wave (SDW) that would exist at ${\mathit{t}}_{\mathit…
Abstract The alteration experiments of phlogopite with 0.01 N HCl solution containing 0.1 M NaCl at 50°, 80° and 120°C have been carried out to aid in the understanding of the dissolution process of mica and the formation of secondary phases such as vermiculite and interstratified mica/vermiculite. Twenty milligrams o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanistic studies of selective catalytic reduction of nitric oxide with ammonia over V2O5/TiO2 (anatase) catalysts through transient isotopic labeling at steady stateUmit S. Ozkan, Yeping Cai, and Mahesh W. KumthekarCite this: J. Phys. Chem. 1995, 99, 8, 2363–2371Publicati…
The solubility, processability , thermal behavior, and even the hydrophilicity of thermally stable aromatic polyamides can be influenced profoundly and relatively easily and inexpensively, by the introduction of bulky pendant groups. Here, the influence of various pendant groups anchored in the 5‐position of the isoph…
<div class="htmlview paragraph">Two catalyst formulations were tested on a diesel engine. A Fourier Transform Infrared (FTIR) analyzer was used to measure concentrations of nitric oxide (NO) and nitrogen dioxide (NO<sub>2</sub>). Other exhaust gas components were measured by conventional analyzers.&l…
The crystallization behaviour of amorphous Ge (a-Ge) in a-Ge/Ag/a-Ge trilayer and a-Ge/Ag multilayer systems has been investigated using in situ transmission electron microscopy (TEM) and differential scanning calorimetry. The crystallization temperature of a-Ge in these systems is 240–270°C, about 250°C lower than th…
Abstract A method for the construction of carbon paste electrodes (CPE) is described. Here ferrocene is used as the insoluble electroactive species, graphite powder as conductor and sulfuric acid as binder. The CPE thus prepared prevents ferrocenium ions from diffusing towards the bulk solutions. Voltammetric, chronop…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT2D-INADEQUATE NMR Evidence for the Termination Mechanism of Styrene Free-Radical PolymerizationDarlene R. Hensley, Stephen D. Goodrich, April Y. Huckstep, H. James Harwood, and Peter L. RinaldiCite this: Macromolecules 1995, 28, 5, 1586–1591Publication Date (Print):February…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesorption Kinetics and Adlayer Sticking Model of n-Butane, n-Hexane, and n-Octane on Al2O3(0001)R. M. Slayton, C. M. Aubuchon, T. L. Camis, A. R. Noble, and N. J. TroCite this: J. Phys. Chem. 1995, 99, 7, 2151–2154Publication Date (Print):February 1, 1995Publication History…
An anomalous stacking fault is reported that is observed within deformation twins in Ti and Zr. Their formation may be restricted to situations where deformation twinning takes place. An understanding of this process sheds new light on the twinning process. In this work the crystal structure of the stacking fault and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplexes of New Electrochemically-Active p-Quinonyl-/p-hydroquinonylphosphines: Multiple Electron/Proton Transfer Reactions and Electrochemical/pH Control of p-Quinonyl-/p-Hydroquinonyl o-Oxygen Atom CoordinationSeri Bima Sembiring, Stephen B. Colbran, and Donald. C. CraigC…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA New Class of Photo-Cross-Linkable Side Chain Liquid Crystalline Polymers Containing Bis(benzylidene)cyclohexanone UnitsGangadhara and Kaushal KishoreCite this: Macromolecules 1995, 28, 4, 806–815Publication Date (Print):February 1, 1995Publication History Published online1…
<div class="htmlview paragraph">Increasingly stringent emissions controls have led to a greater emphasis on strategies designed to minimize emission during cold start. One strategy employed is that of close-coupling the catalyst to the exhaust manifold of the engine in an effort to minimize catalyst light-off ti…
Monoclinic tau(2)-Al13Co4, tau(3)-Al13Co4 and tau(4)-Al13Co4 phases with a and c parameters about tau(2), tau(3) and tau(4) times [tau = (1 + 5(1/2))/2 = 1.61803, which is the golden number], respectively, greater than their counterparts in Al13Co4 (space group Cm, a = 1.5183, b = 0.8122, c = 1.2340 nm, beta = 107 deg…
Porous silicon formed by anodization of a p‐type silicon substrate is characterized by a distribution of crystallites with diameters smaller than about 100 Å. The corresponding size distributions obtained from Raman measurements show distinct peaks which are explained for the first time by the tunneling of holes throu…
Specimens of the 350 K (77°C) ternary eutectic of the Bi–In–Sn system were solidified unidirectionally at very low speeds and quenched to form a representative solid/liquid interface for subsequent study. From such interfaces, this eutectic was observed to be of the faceted–faceted–non-faceted type, freezing to form t…