Materials Literature
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The basis of the conversion reaction, in which high alumina cements develop hydrogarnet subsequent to their set, is weel-established and its mineralogical features accord with phase equilibrium relations in the CaO-Al2O3-H2O system. What is less well understood is the role of silica in the conversion. Silica may subst…
The pyroelectricity in tourmaline crystals has proved to be the secondary pyroelectric effect due to the thermal expansion and the piezoelectricity. On the c-face of a tourmaline powder of radius a [μm], there exists the electric field of 107 [V/m] which decreases following (a/r)3 at distance r and is faint at teen [μ…
A new method for monitoring rather than controling thermal history has been applied recently to analyze the crystallization kinetics at high cooling rate of a highly pure isotactic polypropylene, proving that the cooling history relevant to the structure of quenched samples is in the neighborhood of 90°C. A continuous…
The magnetic properties of the low-temperature phase of MnBi, prepared by rapid solidification, have been measured in a pulsed field over the temperature range 80--625 K. The anisotropy field, obtained by the singular-point-detection technique, is found to increase with temperature and has a maximum value of 9 T at 53…
Following a major shortage of 99Mo in the 2009–2010 period, concern grew that the aging reactor production facilities needed to be replaced. Most producers were using highly enriched 235U (HEU) as the target material. The Organisation for Economic Co-...Read More
It is shown that any force model using short-range pair-functional interactions can only have three independent h.c.p. elastic constants. Empirical data show that these elastic properties are nearly realized in a number of materials. A new parametrization of a Finnis-Sinclair-type many-body potential for titanium is p…
Abstract Each of the RIR based methods for carrying out quantitative X-ray powder diffraction analysis are described and a consistent set of notation is developed. The so called “standardless” analysis procedures are shown to be a special case of the internal-standard method of analysis where the normalizing assumptio…
The correlation energy per atom of a graphite layer is determined by means of increments obtained in ab initio calculations for aromatic molecules with various numbers of correlated localized σ and π orbitals. The resulting correlation contribution to the cohesive energy, evaluated with a double-zeta plus polarization…
Gallium doped zinc oxide films have been deposited in the temperature range 150 to 470 °C from 0.05% diethyl zinc, 0.8% water, and various triethyl gallium concentrations. The films are polycrystalline with crystallite sizes varying between 275 and 500 Å for undoped films and between 125 and 400 Å for doped films. Onl…
Similarities with a number of liquid-crystal systems are revealed by the structural characterization of the low-temperature phases II—IV of the solid adduct from benzene and hexafluorobenzene (right). As the temperature is raised, increased rotation leads to a reduction in the interactions between neighboring columns…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeometry of carbon-hydrogen.cntdot..cntdot..cntdot.oxygen hydrogen bonds in carbohydrate crystal structures. Analysis of neutron diffraction dataThomas Steiner and Wolfram SaengerCite this: J. Am. Chem. Soc. 1992, 114, 26, 10146–10154Publication Date (Print):December 1, 1992…
Perovskite-type oxides containing transition metals are attracting great attention as catalysts for complete oxidation of hydrocarbons as well as electrochemical reduction of oxygen (1). A s far as I know, the use of perovskite-type oxides as catalysts was first reported by Meadowcroft in 1970 (2) for the electrochemi…
The syntheses, structures, and spectroscopic properties of some novel dodecaphenyl- and dodecaalkylporphyrins have been investigated with the aim of designing model compounds to aid in evaluating theoretical models of porphyrin nonplanarity. It was found that dodecaphenylporphyrin (3) and the dodecaalkylporphyrins 4a-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEquilibrium measurements of oscillatory disjoining pressures in aqueous foam filmsV. Bergeron and C. J. RadkeCite this: Langmuir 1992, 8, 12, 3020–3026Publication Date (Print):December 1, 1992Publication History Published online1 May 2002Published inissue 1 December 1992http…
Proton exchange and subsequent dehydration of layered titanates with the formula A2TinO2n+1 (A = Na, K, Cs; 3 ≤ n ≤ 6) yield TiO2 (B) at temperatures below 350°C. In order to elucidate the mechanism of TiO2 (B) formation, we have characterized these reactions using thermal analysis and crystallographic techniques, and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical applications of the bending beam method. 1. Mass transport and volume changes in polypyrrole during redoxQibing Pei and Olle InganaesCite this: J. Phys. Chem. 1992, 96, 25, 10507–10514Publication Date (Print):December 1, 1992Publication History Published onli…
Abstract The theoretical and experimental data on the breakup of droplets are reviewed. Several factors influence development of droplets: flow type and its intensity, viscosity ratio, elasticity of polymers, composition, thermodynamic interactions, time, etc. For Newtonian systems undergoing small, linear deformation…
The hemocompatibility of a polymer containing a phospholipid polar group, poly(2-methacryloyloxyethyl phosphorylcholine (MPC)-co-n-butyl methacrylate(BMA)), with human whole blood was evaluated. When human whole blood without an anticoagulant was contacted with polymers, the blood cell adhesion and aggregation on the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of colloidal dispersions of fluorescent, monodisperse silica spheresA. Van Blaaderen and A. VrijCite this: Langmuir 1992, 8, 12, 2921–2931Publication Date (Print):December 1, 1992Publication History Published online1 May 2002Published inissue 1…
A review is presented of the point defect model (PDM) for the growth and breakdown of passive films on metal and alloy surfaces in contact with aqueous solutions. The model provides a reasonable account of the steady‐state properties of cation‐conducting and anion‐conducting barrier layers on nickel and tungsten, resp…