Materials Literature
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Sodium ion, cesium ion, and water self‐diffusion coefficients in a perfluorinated carboxylate polymer film have been measured. Results are compared to those obtained for a perfluorinated sulfonate polymer, Nafion. Both cation and water diffusion coefficients are very large in these materials in relation to the equilib…
Carbonate-containing apatites prepared from aqueous and non-aqueous media were investigated by ESR, IR, and X-ray diffraction. A typical asymmetric signal at g = 2.0, which many workers have observed in irradiated calcified tissues, is interpreted in terms of CO3(3)- and Co-2 and the trapped electron center, The CO3(3…
Abstract A series of interpenetrating polymer networks, IPN's, and semi‐1 IPN's of poly(n‐butyl acrylate) and polystyrene were prepared. The glass transition behavior via dynamic mechanical spectroscopy (DMS) and the morphology via transmission electron microscopy (TEM) were studied as a function of composition ratio…
Abstract Model hard segments having different chain length and chain terminating groups, such as methyl, ethyl, octyl, and octadecyl, have been synthesized from diphenyl‐methane diisocyanate (MDI) and butanediol and studied by DSC. In the case of short chain ends (i.e., methyl, ethyl, and octyl), hard segments having…
Effect of a transverse magnetic field on the suppression of thermal convection was investigated in a vertical column of melt under a destabilizing temperature gradient (β). The melt height and β were 2.5 cm and 16°C/cm, respectively. At , a turbulent thermal convection occurred as measured by a thermocouple inserted i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPyrazolyl-bridged iridium dimers. 2. Contrasting modes of two-center oxidative addition to a bimetallic system and reductive access to the starting complex: three key diiridium structures representing short nonbonding and long and short bonding metal-metal interactionsA. W.…
The kinetics of laser and furnace-induced solid phase epitaxial crystallization of As-implanted amorphous layers (∼0.16 μm) on Si (100) substrates was studied using a time-resolved optical reflectivity technique. Epitaxial rates from 10−10 to 0.2 cm/sec were measured over a temperature range from 750 to 1550 °K at two…
Abstract A synthesis of studies on the photocatalytic oxidation of various compounds (isobutane, propene, alkyltoluenes, butanols, ammonia, halide ions in aqueous solution) is presented, TiO 2 being the main photocatalyst. Comparisons are also made with other n‐type semiconductors: ZrO 2 , V 2 O 5 , Sb 2 O 4 , ZnO, Sn…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure and emission spectrum of the undecacoordinate complex tris(nitrato)-1,4,7,10,13-pentaoxacyclopentadecaneeuropium(III)Jean Claude G. Bunzli, Bernard Klein, Gervais Chapuis, and Kurt J. SchenkCite this: Inorg. Chem. 1982, 21, 2, 808–812Publication Date (Print…
Abstract Poly(caprolactone) (PCL) was blended with poly(chlorostyrene) (PSCI) and chlorinated polypropylene (PPCl). A single glass transition temperature T g was found for these mixtures, indicating their miscibility. PCL crystallizes in these blends when the chlorinated polymer content is not too high. Otherwise, T g…
Terbium, a trivalent lanthanide, effectively substituted for Ca2+ in calmodulin as judged by several criteria: intrinsic fluorescence spectra, altered mobilities on polyacrylamide gel electrophoresis, formation of a stable complex with troponin I or calcineurin, and stimulation of phosphodiesterase. Calmodulin harbors…
We report details and results of experiments in which surface enhanced Raman scattering from molecules is studied as a function of their spacing from a rough silver enhancing layer. Two types of experiments were performed. In the first, an organic monolayer chemisorbed on aluminum oxide is covered with a smooth low Ra…
Abstract Blends of polycaprolactone (PCL) with chlorinated polyethylenes (PECls) having chlorine contents of 25, 30, 36, 42, and 48% by weight were prepared and studied by differential scanning calorimetry and small‐angle light scattering (SALS). It was found that blends made with PECls containing 30% or more chlorine…
This paper describes the structure of bovine pancreatic ribonuclease A, refined by a restrained parameter least squares procedure at 2.0 A resolution, and rebuilt using computer graphics. The final agreement factor (formula see text) is 0.159. The positions of the 951 main chain atoms have been determined with an esti…
Abstract Acetyl sulfate was used as sulfonating agent for the sulfonation of cis ‐1,4‐polyisoprene. IR and NMR spectra showed that the sulfonation was accompanied by extensive cyclization. A series of DSC and loss tangent studies of both the sodium salts and the methyl esters was undertaken. It was found that cyclizat…
Experiments on the Mössbauer effect of 125 Te and the X-ray diffraction for antiferromagnetic MnTe 2 were performed. Temperature dependence of the spin direction has been observed for a magnetic ordering of the first kind fcc lattice. The angle between the spin direction of Mn and the principal axis of electric field…
The electric-field-induced liquid-crystal (LC) cholesteric-to-nematic (C-N) phase transformation and its relaxation (N-C) are examined using the anisotropic color absorption properties of a dichroic dye dopant. A tristability is observed. The stable memory associated with the tristability has potential application to…
Abstract Raman spectra of two hydroxy azoic model compounds: 3,5‐dimethoxy‐4‐hydroxyazobenzene and 2,6‐dimethoxy‐4‐hydroxyazobenzene are compared. These compounds exist as the pure azo and pure hydrazone forms respectively, thus allowing the assignment of numerous Raman Bands characteristic of each tautomer. The usefu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordination and reduction of nitric oxide on a cobalt tetraphenylporphyrin imidazole complexKazuhiko Tsuji, Masahiko Imaizumi, Akira Oyoshi, Isao Mochida, Hiroshi Fujitsu, and Kenjiro TakeshitaCite this: Inorg. Chem. 1982, 21, 2, 721–725Publication Date (Print):February 1,…
Abstract A pilot-size brine handling system was operated from Magmamax Well 1 in southern California to study the characteristics of siliceous scale deposition and to evaluate the possibility of treating the brine with chemical additives to control scaling. The rates of formation, chemical constitution, and morphology…