Materials Literature
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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…
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…
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…
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…
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 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…
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…
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…
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…
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…
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…
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):…
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 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.
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…
Monoclonal antibody technology allows the specificity of an antibody for its antigen to be used in targeting cancer cells. The conjugation of metals, particularly radionuclides such as 90Y or 67Cu, to monoclonal antibodies results in agents for radioimmunotherapy and other medical applications. Chelators that can hold…
For the thermotropic cholesteric mesophase of tri-o-(β-methoxyethoxy)ethyl cellulose (DP = 11), cholesteric pitches larger than 2 μm were precisely determined by microscopic observation and their temperature dependence was examined in the temperature range from 80°C to 140°C. In the initial temperature region of 80°C…
We measure the surface order parameter ${S}_{s}$ at the interface between the nematic liquid crystal p-methoxy-benzylidine-p-n-butyl-aniline and a rough glass plate. Roughness is induced by oblique evaporation of SiO. We observe a critical decrease of ${S}_{s}$ when the surface roughness increases, just above the tran…
Abstract The behavior of poly(ethylene terephthalate) (PET) and poly(butylene terephthalate) (PBT) on water aging has been studied above and below the glass transition temperature ( T g ). The aging process is caused by: degradation of the matrix and an increase in crystallinity above T g , and microcavitation at the…
A “diagonal relationship” between technetium(VII) and osmium(VIII) can be proposed based on the properties of the newly synthesized title compounds. Like the valence‐isoelectronic OsO 4 , MeTcO 3 adds olefins to form metallacycles (→ cis ‐diols), whereas the formally analogous MeReO 3 epoxidates olefins in the presenc…