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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…
Abstract
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…
Electrically equivalent circuits for the paraelectric phase of layer-structured BaBi4Ti4O15 single crystals in the parallel and perpendicular directions to the (Bi2O2)2+ layer were identified by complex impedance and modulus analysis at 600 to 767°C. The same form of single semicircle in complex impedance plots for bo…
The conductivity of sputtered Ta/Cu/Ta and Ta/Ni/sub 80/Fe/sub 20//Ta thin films was measured for a film thickness ranging from 20 to 1500 /spl Aring/. The measured data were analyzed using a semi-classical model for the electron transport, that includes grain boundary scattering, It was found that in these films grai…
The syntheses of two types of semisynthetic receptor composed of porphyrins capped on one or both faces by a cyclic dilactone of cholic acid (a 7,24-cydo[2]cholate) are presented. The singly capped diarylporphyrin was made by macrolactonisation over a preformed porphyrin and also by porphyrin synthesis beneath a prefo…
Abstract The use of electrochemical impedance spectroscopy (EIS) and electrochemical noise analysis (ENA) for non‐destructive evaluation of corrosion processes is illustrated for three model systems. EIS can be used to detect and monitor localized corrosion of Al alloys and determine pit growth laws which can be used…
A theoretical model is proposed in order to explain the lamellar or spiked morphology of domains of opposite polarization observed in ferroelectric crystals in their polar phase. A nonconvex free energy is constructed, which has two isolated minima corresponding to states of opposite spontaneous polarization. The jump…
Polypropylene (PP) surface in water was photochemically modified to render it hydrophilic using ArF excimer laser radiation. The chemical stability of PP is attributed to the C-H and C-H3 bonds present. Thus, it is considered that H atoms are selectively pulled out from the area irradiated with ArF excimer laser light…
Abstract The condensation reaction between tetraaza[14]annulene nickel(II) complex and a series of para ‐substituted benzoyl chlorides gave the corresponding 7,16‐dibenzoylated products in 53–98% yields. The mass spectra exhibit molecular ion peaks ascribed to the 7,16‐dibenzoylated products. The intense ir band due t…