Materials Literature
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In situ observations by the synchrotron white beam X-ray topographic method are carried out during the directional solidification of thin samples (0.2-0.3 mm) of a Al-0.73 wt% Cu alloy. Stresses associated to morphological instability and pattern formation are analysed. Due to compressions and dilatations induced by t…
Abstract A method is developed for the calculation of the saturation temperature of a KCI‐NaCI aqueous solution, based on the measurement of the density and temperature of a sample solution, and prior knowledge of the NaCl concentration. Experimental density and solubility data for solutions saturated with KCI in the…
A new method to measure the elastic anisotropy of liquid crystals is presented. The method is based on the determination of the transverse spatial decay of the molecular director profile across the shadow region of a truncated laser beam intense enough to reorient the sample. The effective optical Kerr constant due to…
Sheets made from untreated and treated wood and bagasse pulps were subjected to thermal degradation in static air and monitored by the differential thermal analysis (DTA) technique. Percent of resin (resol or novolac) added to the pulps was chosen on the basis that maximum breaking length was achieved. The DTA profile…
Abstract It is shown, that the portion of a shaped charge jet that emerges from explosive reactive armor is longer or at least less disturbed if the jet tip velocity can be raised. Generally, the residual jet length largely depends on the ratio of the reaction time of the armor and the standoff of the shaped charge fr…
The semiconductor properties of passive films on different stainless steels were investigated by photoelectrochemical methods. Photocurrent‐potential measurements together with data for the susceptibility of the materials to localized corrosion revealed that above a critical potential value photocurrents as well as th…
In situ scanning tunneling microscopy (STM) and ex situ atomic force microscopy (AFM) were used to examine the surface morphology of anodized p‐Si(100) electrodes in F − ‐containing solutions. In addition to the formation of a mainly pitted and rough surface, in situ STM observation of anisotropic etching of Si(100) i…
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…