Materials Literature
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Bicomponent mixtures of 4-cyanobiphenyl-4′-yl 4′-alkylbiphenyl-4-carboxylates (nCBB) and 4-alkoxy-4′-cyanobiphenyls (nOCB) were studied and their phase diagrams obtained by thermomicroscopy. The strong enhancement of a smectic Ad phase in mixtures with the smectic members of the nOCB (n ⩾ 8) series and the induction o…
Aluminum powder entrained by ammonia‐containing nitrogen gas was reacted at various temperatures and time to form aluminum nitride powder. The kinetics of nitride formation were determined by a quantitative X‐ray analysis and compared with those determined by a nitrogen analysis of the product. The conversion to alumi…
Sulfapyridine is used to test the extended Hildebrand approach for predicting solubility in dioxane-water mixtures. The method provided good agreement with the experimental data. A modification of this method, that directly relates the logarithm of the mole fraction solubility with the solubility parameter of the solv…
Stator bars subjected to operating stresses for 7 and 22 year periods were retrieved from a hydrogenerator to undergo short term electrical diagnostic tests in order to determine whether any significant aging of the insulation had taken place. The AC breakdown voltage (U/sub bk/), partial discharge inception voltage (…
Novel chiral twin molecules, (S)-2-methylnonanedioic acid bis[4-(5-octyl-2-pyrimidinyl)phenyl] ester (MNB-8-PYP) and (S)-2-methyldecanedioic acid bis[4-(5-octyl-2-pyrimidinyl)phenyl] ester (MDB-8-PYP), have been prepared and the odd-even effect of the chiral spacer on the helical twisting power investigated. Pitch mea…
Abstract Microporous silica gels can be made by polymerizing partially hydrolyzed tetramethoxysilane sols present in the aqueous phase of bicontinuous microemulsions stabilized with didodecyldimethylammonium bromide. When vacuum‐dried, the gels made in microemulsions have about twice the specific surface area of conve…
Abstract The plastic deformation mechanism operating in polymer glasses is analyzed. The whole process consists of two main stages: nucleation of special shear defects, called PSTs (plastic shear transformations), and their disappearance. The important feature of plastic deformation of glasses is the storage of a larg…
NO2 adsorption on α-chromia leads to the formation of bridged and bidentate nitrates as well as of nitro species. In an NO2 atmosphere the latter are oxidized to nitrates. When NO2 is adsorbed with the participation of the surface hydroxy groups on chromia, bridged nitrates and water are among the reaction products. A…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLocalization Effects in Asymmetrically Substituted Polythiophenes: Controlled Generation of Polarons, Dimerized Polarons, and BipolaronsKarim Faied, Mario Leclerc, My Nguyen, and Art DiazCite this: Macromolecules 1995, 28, 1, 284–287Publication Date (Print):January 1, 1995Pu…
Partially deuterated betaine phosphite (DBPI) crystals were investigated by measurements of the dielectric constant and by means of electron paramagnetic resonance (EPR). Two phase transitions could be detected in the temperature range from 100 K to 380 K: a high-temperature phase transition at Tc1 = (355 ± 3) K and a…
Abstract At 150 K [Ba(TDFND) 2 , tetraglyme] crystallises in the P 1 / c space group with a = 17.15(2) Å b = 10.735(5) Å, c = 22.830(7) A, β = 97.56 (7)°, V = 4165 (5) Å 3 , Z =4. R 1 = 0.0435, wR 2 = 0.1079. The barium atom is nine‐co‐ordinate, with binding to all the O atoms. The two BaTDFND rings are planar but til…
Electrolysis of NO and CH4 in the presence of excess O2 has been studied using a single-compartment reactor, constructed from yttria-stabilized zirconia (YSZ), with two palladium electrodes. The palladium electrodes were attached by an electroless plating method. Experiments were conducted between 550 and 900 °C with…
Subcellular Fractionation and Analysis of Function: D.W. Galbraith, J. Sheen, R.J. Grebenok, G.M. Lambert, and J. Sheen, Flow Cytometric Analysis of Transgene Expression in Higher Plants: Green Fluorescent Protein. W.F.J. Vermaas, Functional Effects of Structural Changes in Photosystem II as Measured by Chlorophyll Fl…
Recent advances in performance of chemical double layer capacitors (DLC) with aqueous and non-aqueous electrolytes have made it possible to seriously consider them for commercialization. Non-aqueous (organic) carbon based laboratory monopolar devices have recently met key U.S. Department of Energy (DoE) mid-term speci…
The ionization damage associated with electron and X-ray irradiation of insulating specimens during their investigation by various techniques (EM, AES, XPS, etc) is considered from the point of view of the Auger mechanism. This damage results from the Auger electron transport through the specimen and more specifically…
Crystalline poly(ethylene oxide)(PEO) and PEO–Nal (3 : 1) have been studied using molecular dynamics simulations at constant pressure with a flexible simulation box. The potentials employed have been shown to reproduce the experimental crystal parameters. Na+ and I– diffusion have also been investigated in both crysta…
Temperature-programmed decomposition has been used to determine the energetics of metalcarbonyl bond dissociation in the surface-mediated decarbonylation of Mo(CO)6 adsorbed on alumina, magnesia, silica, titania, zirconia and zinc oxide. To estimate the influence of the surface microstructure, the reaction was studied…
Gas nitriding experiments were carried out for two series of iron specimens at 575°C: one was preheatedin air at 300°C for 1 h before nitriding, the other was nitrided directly. It was found that the pretreatment has a significant effect on the formation of the nitrides. Without preoxidation, the rate of nitriding was…
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Description Features the latest information on methods for predicting how composite materials and composite material structures fail. 27 peer-reviewed papers from the world's leading professionals in the field. Five key areas: Delamination Characterization -- Eight papers explore the challenges of characterizing delam…