Materials Literature
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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…
This paper describes a multichip module technology based on highly impermeable liquid crystal polymers (LCPs) to interconnect and package monolithic microwave integrated circuits (MMICs). Because of the low moisture permeability of the LCPs, the packages can be made hermetic without heavy expensive housings can be two…
Specifications for PD tests on cables and equipment have been harmonized gradually during the past thirty years. However, there are still marked differences in the requirements for overvoltage conditioning, prior to PD tests, also in the voltages at which PD measurements are made. The merits of various specifications…
The application of liposomes as carriers for imaging agents is considered. Liposomes loaded with the appropriate contrast agents have been shown to be suitable for gamma-, magnetic resonance (MR), computed tomography (CT) and ultrasound imaging. The methods are briefly described to prepare liposomes loaded with differ…
Six fiberglass casting tapes were evaluated in bending, using an unstable fracture model. Cylindrical casts were constructed and evaluated in bending at 2, 3, and 24 hours after application. Scotchcast Plus (3M, St. Paul, MN), Vet Cast II (3M), and Zim-Flex (Zimmer, Warsaw, IN) were significantly stronger than other m…
Solid solutions of SrZr1-xYxO3–0.5x having orthorhombic perovskite-type structure with 0⩽x⩽0.2 have been studied. The conductivity increased and the activation energy decreased with yttrium content up to x = 0.2 at low temperature or x = 0.05 at high temperature. The proton and oxygen transference numbers measured in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHard/Soft Interactions in Early Transition Metal Thioether Macrocyclic Chemistry: Synthesis and Single Crystal Structure of cis-[CrCl2([14]aneS4)]PF6 ([14]aneS4 = 1,4,8,11-tetrathiacyclotetradecane)Neil R. Champness, Sarah R. Jacob, Gillian Reid, and Christopher S. FramptonC…