Progress in Electron Probe Microanalysis
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Materials Literature
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Quantum mechanical calculations on molecular sieves. 2. Model cluster investigation of silicoaluminophosphates
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantum mechanical calculations on molecular sieves. 2. Model cluster investigation of silicoaluminophosphatesEric G. Derouane, J. G. Fripiat, and R. Von BallmoosCite this: J. Phys. Chem. 1990, 94, 4, 1687–1692Publication Date (Print):February 1, 1990Publication History Publ…
Neutron diffraction and transmission electron microscopy study of hydrogen-induced phase transformations in Zr3Al
Hydrogen-induced phase transformations of the equilibrium intermetallic compound Zr3 Al have been studied by in situ elastic neutron scattering, x-ray diffraction, and transmission electron microscopy (TEM). TEM observations reveal two distinct modes of amorphous phase formation in Zr3 Al upon hydrogenation, namely, h…
Influence of addition of potassium chloride to silver colloids
Abstract The influence on silver colloids of the addition of KCI was directly investigated by means of transmission electron microscopy (TEM). It was found that the particle size increased and the surfaces of the crystal particles of the silver became covered with an overlayer. Additionally, the pattern of aggregation…
A Linear Relationship between the Glass Transition Temperature and Local Distortion of Calcium Gallate, Barium Gallate, and Calcium Aluminate Glasses
Abstract The isomer shift in the 57Fe-Mössbauer spectra of xCaO·(90−x)Ga2O3·10Fe2O3 (x=40–60) and xBaO ·(90−x)Ga2O3·10Fe2O3(x=65–70) glasses decreases gradually from 0.28 to 0.16 mm s−1 with increasing CaO or BaO contents. This indicates a formation of nonbridging oxygen atoms in the GaO4 and FeO4 tetrahedra. Large qu…
Optical Properties and Nature of Coordination of Cu+ Ions in Calcium Metaphosphate Glass
Abstract Absorption, emission, and excitation spectra of copper(I) ions in calcium metaphosphate glass are investigated. Analysis of the absorption spectrum in the light of ligand field theory reveals that the oxygen coordination surrounding the ion in glass is grossly a trigonally distorted octahedron. A chemical mod…
Effects of p-aminodiphenylamine on electrochemical polymerization of aniline
A new method for electrochemical polymerization of aniline is presented in which a small amount of p-aminodiphenylamine is added to the polymerization system. In the presence of p-aminodiphenylamine, the rate of polymerization increases greatly, the lower potentials can be applied to generate polyaniline with probably…
Zur Fibrillarstruktur nativer Cellulose
Abstract Die Mikrofibrillarsturktur von Algencellulose, Bakteriencellulose, Ramie, Baumwollinters und Chemiezellstoff wurde mittels Elektronenmikroskopie und Röntgen‐Weitwinkelstreuung vergleichend untersucht. In Abhängigkeit von der Herkunft der Cellulose werden elektronmikroskopicsch Mikrofibrillen mit unterschiedli…
Wetting and Capillary Condensation in Liquid Crystal Systems
We discuss, using general principles, the growth of a nematic wetting layer at a surface in an isotropic fluid close to the nematic-isotropic transition. The effect of competition between the nematic anchoring at a wall and at the incipient isotropic surface can lead to effects which are particular to systems with ori…
A Modified Double Loop EPR Technique for Detection of Sensitization in Cast Stainless Steel
The double loop electrochemical potentiodynamic reactivation technique was developed to detect sensitization in wrought stainless steel. Because cast stainless steel has a different microstructure than wrought stainless steel, neither the double loop nor the single loop EPR technique has the selectivity required to de…
Photoluminescence at a semiconductor-electrolyte contact around and beyond the flat-band potential
Photoluminescence measurements have been performed to study CdSe-, CdS-, and GaP- electrolyte contacts under cathodic bias. A strong increase of the luminescence intensity has been found in those cases where an accumulation layer is formed at the interface. This potential dependence is interpreted in terms of aquenchi…
Dissociation behavior of poly(fumaric acid) and poly(maleic acid). II. Model calculation
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDissociation behavior of poly(fumaric acid) and poly(maleic acid). II. Model calculationSeigou Kawaguchi, Toshiaki Kitano, Koichi Ito, and Akira MinakataCite this: Macromolecules 1990, 23, 3, 731–738Publication Date (Print):February 1, 1990Publication History Published onlin…
Dendritic growth rate at arbitrary undercooling
We study the growth rate of a dendritic crystal in two and three dimensions in the symmetric model of solidification. We clarify the question of the variation of the ``stability constant'' with the P\'eclet number in the regime of moderate to large values. A careful WKB treatment shows that the eigenvalues selected by…
Comparison of the three aspartokinase isozymes in Bacillus subtilis Marburg and 168
The levels of two aspartokinase isozymes, a lysine-sensitive enzyme and an aspartokinase that is inhibited synergistically by lysine plus threonine, differ strikingly in different strains of Bacillus subtilis. In derivatives of B. subtilis 168 growing in minimal medium, the predominant isozyme is the lysine-sensitive…
Pyrolysis of Silicon‐Backbone Polymers to Silicon Carbide
A systematic study of the role of the composition of polysilane homo‐, co‐, and terpolymers on their pyrolysis yield to silicon carbide (SiC) was performed. The ceramic yield was found to increase as the poly(dimethylsilane) structure was substituted with hexyl and, especially, phenyl groups. the best improvement in S…
Na+/H+ antiporter is the primary proton transport system used by osteoclasts during bone resorption
We have examined the effects of inhibitors of proton transport systems on osteoclastic bone resorption using an in vitro bone slice assay, where osteoclasts (OCs) are free from the influence of other bone cells. Amiloride (AM) and dimethylamiloride (DMA), inhibitors of the Na+/H+ antiporter, were potent inhibitors of…
An efficient synthesis of .alpha.-silylacetates having various types of functional groups in the molecules
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn efficient synthesis of .alpha.-silylacetates having various types of functional groups in the moleculesYasuyuki Kita, Junichi Sekihachi, Yoshikazu Hayashi, Yong Zhong Da, Miki Yamamoto, and Shuji AkaiCite this: J. Org. Chem. 1990, 55, 3, 1108–1112Publication Date (Print):…
Impedance Analysis of Ionic Transport in Polypyrrole‐Polyazulene Copolymer and Its Charge‐Discharge Characteristics
Ionic transport behavior across an electropolymerized polypyrrole/polyazulene composite film was investigated by using ac impedance analysis, and its charge‐discharge characteristics were also studied. Co‐electropolymerization of pyrrole and azulene was well defined and fairly stoichiometric in propylene carbonate sol…
A method calculating bond valences in crystals
A method of calculating the expected bond valences from the connectivity matrix of complex crystals is described. The method is exact (does not require iteration) and is suitable for implementation on a microcomputer.
Pitting Susceptibility of Stainless Steels in Bromide Solutions at Elevated Temperatures
The pitting susceptibility of a range of austenitic stainless steels with different molybdenum contents was evaluated in both chloride and bromide solutions at elevated temperatures, using electrochemical polarization techniques. It is found that there is a less beneficial effect of molybdenum in solutions containing…