Materials Literature
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A series of eight addition polymides (aspartimides) was prepared in which the imide and amino groups were attached to the ends of aromatic residues containing two or four phenylene rings. The co-monomers (bis-maleimides. BMIs, and diamines) were purified using column chromatography before being fully characterized by…
Deformed structures of cold rolled 70–30 brass have been studied using both textural and microstructural techniques to establish the twinning tendencies of different orientations. Extensive studies using transmission electron microscopy showed that there are significant volumes of material with near {110}〈112〉 brass (…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structure of a new layered pnictide oxide containing close Mn-Mn interactions: barium manganese arsenide oxide (Ba2Mn2As2O)Stephanie L. Brock, Hakon Hope, and Susan M. KauzlarichCite this: Inorg. Chem. 1994, 33, 3, 405–406Publication Date (Print):February 1, 19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemically Designed, UV Curable Polycarbosilane Polymer for the Production of Silicon CarbideKevin J. Thorne, Stephen E. Johnson, Haixing Zheng, John D. Mackenzie, and M. F. HawthorneCite this: Chem. Mater. 1994, 6, 2, 110–115Publication Date (Print):February 1, 1994Publicat…
The temperature-density phase diagram of a model binary mixture in two dimensions is investigated using a semi-grand-canonical Monte Carlo simulation scheme which allows for exchange between the two species while keeping the total number of atoms fixed. The gas-liquid and the gas-solid regions of the phase diagram are…
Quantities that depend on the collective effects of groups of particles cannot be obtained from the standard Boltzmann transport equation. Monte Carlo estimates of these quantities are called non-Boltzmann tallies and have become increasingly important recently. Standard Monte Carlo variance reduction techniques were…
Measurements of the IR spectra of native cotton linters and hydroxyethyl cellulose samples of different ethoxyl contents indicated that weaker-bonded OH groups are present in hydroxyethylated cellulose of ethoxyl contents of 23.34—28.89%. Also, the crystallinity indices, mean hydrogen bond strengths, and asymmetry ind…
Abstract The 79,81 Br NQR spectra of tetraanilinium decabromotricadmate (1) and 4-methylpyridinium tribromocadmate (2 ) were studied as function of temperature and their crystal structures were determined. (C 6 H 5 NH 3 ) 4 Cd 3 Br 10 (1): Space group D 1 5 2h - Pbca , Z = 4, a = 2507.8(7) pm, b = 1985.4(5)pm, c = 763…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiffusion Behavior of Anions in Polyaniline during Electrochemical Undoping.2.Effect of the Preparation Conditions of Polyaniline on the Diffusion Coefficient of BF4-Kiyoshi Kanamura, Yasunori Kawai, Susumu Yonezawa, and Zenichiro TakeharaCite this: J. Phys. Chem. 1994, 98,…
Abstract The crystallization of poly(butylene terephthalate) (PBT) from moderately dilute solutions of PBT in a diglycidyl ether of bisphenol‐A epoxy has been investigated. PBT dissolves in this epoxy approximately 35°C below its usual melting temperature of 227°C to form a one‐phase solution. Cooling this solution be…
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The room-temperature single-crystal X-ray structural characterization of the title compound (tpyH2)2[Tb(OH2)8]Cl7.~2?H2O is recorded. Crystals are triclinic, Pi , a 17.063(5), b 16.243(3), c 7.878(3) ?, a 84.78(2), ß 84.39(3), ? 87.81(2)°, Z = 2 formula units; 3167 'observed' diffractometer reflections were refined by…
The surface modification of metals by the application of blood compatible ceramics is one approach to developing durable and blood-compatible materials. The blood compatibility of sputter-deposited alumina films was investigated in vitro. The alumina films were prepared by reactive sputtering and conventional sputteri…
The fabrication of thermoelectric generators using standard MOS thin film technology is described. Process sequences are presented for generators based on both silicon on sapphire and polycrystalline silicon on quartz substrates; the active elements being formed in both cases by ion implantation of alternate n-type an…
At the beginning of the plastic deformation of polycrystals, dislocations are mainly accumulated in grain boundaries (GBs), forming extrinsic grain-boundary dislocations (EGBDs). EGBDs create long-range stress fields which in turn considerably affect the dislocation glide in grains. On the basis of dislocation pile-up…
Abstract Clay minerals from the MacAdams Sandstone, Kettleman North Dome, California, have been studied by electron microscopy. The clay minerals fill pore space associated with fractured and brecciated clasts of K-feldspar. Curved packets of muscovite and kaolinite are caused by deformation of detrital muscovite that…
The effect of added non-adsorbing polymer on the isotropic-nematic phase transition in a model lyotropic liquid crystal - a suspension of hard rods - is studied theoretically. The results indicate that the transition is widened and that polymer is partitioned preferentially into the more dilute isotropic phase. The co…
The phase diagram of binary system of 4-n-pentyl 4′cyanobiphenyl (component 1) and 4-n pentylphenyl 4-n′hexyloxy benzoate (component 2) is presented, which shows the presence of an injected smetic phase. Refractive indices and densities for ten different compositions of this mixture and for one pure component are meas…
Abstract The temperature dependence of ionic mobility for a silver ion conducting borate glass with composition 55.5 AgI22.25 Ag 2 O22.25 B 2 O 3 (in mol%) is reported along with conductivity. Subsequently the value of mobile carriers n is calculated. The value of n is found to decrease with increase in temperature.…
We consider a nematic slab with homeotropic anchoring and investigate the effect of a magnetic field, H, parallel to the plates and an electric field, E, perpendicular to them $(\epsilon_{\rm a} < 0,~\chi_{\rm a} > 0)$. The magnetic field is either fixed, or rotating at a frequency ω around an axis perpendicular to th…