Materials Literature
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The effect of EDTA (ethylenediaminetetraacetic acid, added as ) on the electrochemical behavior of iron and on the semiconducting properties of passive films formed on this metal in borate buffer solution (pH 8.4) was studied. Electrochemical studies, including potentiodynamic and galvanostatic reduction experiments a…
Preface. Introduction: Systemic Chemistry. Molecular Assemblies. A Few Notions of Symmetry. Supramolecular Engineering: Symmetry Aspects. Symmetry and Physicochemical Properties: The Curie Principle. Interactions and Organization in Molecular Media. Molecular Semiconductors: Properties and Applications.Molecular Diele…
Results of high-speed electrical and optical diagnostics are used as a basis to discuss a new surface flashover model. Outgassing, caused by electron stimulated desorption, is found to play a crucial role in the temporal flashover development. Dielectric unipolar surface flashover under vacuum is experimentally charac…
Density functional theory (DFT) calculations have been used to predict the IR and Raman spectra for zinc phthalocyanine (ZnPc). There is very good agreement in the frequency data (RMS error of 10 cm−1 for IR and 12 cm−1 for Raman scattering, with half of the bands in both cases predicted to within 6 cm−1). The precisi…
The O 2 reduction reactions on Sr‐doped LaMnO 3 (LSM) electrodes in solid‐oxide fuel cells in the absence and presence of a chromia‐forming alloy metallic interconnect have been investigated. Similar to those in the absence of the chromia‐forming alloy, the O 2 reduction reactions on LSM electrodes in the presence of…
An experimental program has been carried out to measure the terminal solid solubility (TSS) of hydrogen in Zircaloy. Unirradiated electron beam (EB) welded Zircaloy-2, EB-welded Zircaloy-4, Zircaloy-2 pressure tube, cold-worked β-quenched Zircaloy-2 forging, oxygen-strengthened tungsten inert gas (TIG) welded Zircaloy…
The thermoelectric properties of the pure and doped half-Heusler compounds FeVSb and FeNbSb are reported. The electrical resistivities are between 0.2 and 20 mΩ cm at room temperature. Thermoelectric power measurements indicate that FeVSb is an n-type material with moderate Seebeck coefficients near −70 μV/K at 300 K.…
Several sea sources for chitin have been investigated, and the chitin content and crystallographic polymorph of the extracted chitin determined. Deacetylation of the chitin was carried out and the physicochemical characteristics of the resulting chitosan studied. The influence of the reaction parameters (reaction dura…
The Materials Research Collaborative Access Team (MRCAT) beamline 10-ID at the Advanced Photon Source has been in Commissioning since January 1998. This Beamline has been designed as a flexible spectroscopy, scattering, and diffraction facility for the study of materials in situ. Over 70 users have performed experimen…
▪ Abstract A vapor explosion results from the rapid and intense heat transfer that may follow contact between a hot liquid and a cold, more volatile one. Because it can happen during severe-accident sequences of a nuclear power plan, that is, when a large part of the core is molten, vapor explosions have been widely s…
The first X-ray structurally characterized M3L2 cage-like complex with tetrahedral metal centres [Zn3(tib)2- (OAc)6]·xH2O [tib = 1,3,5-tris(imidazol-1-ylmethyl)benzene, x ≈ 4] obtained by reaction of zinc(II) acetate with the tripodal ligand tib exhibits guest inclusion properties of neutral molecule such as synthetic…
The (photo)electrochemical behavior of n‐GaN[0001] in various aqueous solutions was studied using rotating‐disk voltammetry, cyclic voltammetry, and electrical impedance measurements. It was found that the bandedges of the semiconductor shift over 60 mV/pH unit, indicating acid‐base equilibria at the interface. In and…
The association of aromatic electron donor groups with proquinoid acceptors leads to π-conjugated fluorophores combining tunable emission wavelength at constant geometry, high fluorescence efficiency and high electron affinity.
The involvement of the reaction of surface nitrate [NO3−(ads)] species with different reductants (C3H6, C2H5OH and CH3OH) in the selective catalytic reduction of nitrogen oxides (NOx) over a Ag/Al2O3 catalyst has been studied by in situ diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy and temperatur…
This work provides information concerning possible global environmental implications and personnel safety aspects that should be considered during the commercial uses of sulfur hexafluoride (SF6). SF6 is an anthropogenically produced compound, mainly used as a gaseous dielectric in gas insulated switchgear power insta…
Epoxy resins containing phosphorus and/or silicon are prepared from phosphorus/silicon-containing epoxides and diamine curing agents. The flame-retardant properties of the phosphorus/silicon-containing epoxy were studied. Furthermore, the phosphorus–silicon synergistic effect on LOI enhancement and increasing flame re…
Dicobalt(II) cofacial bisporphyrins anchored by dibenzofuran (DPD) and xanthene (DPX) are efficient electrocatalysts for the four-electron reduction of oxygen to water despite their ca. 4 Å difference in metal–metal distances, suggesting that the considerable longitudinal ‘Pac-Man’ flexibility of the pillared platform…
The cyclic voltammetric responses and capacitive behavior of single‐walled carbon nanotube sheets or papers are described. Broad redox responses have been observed in aqueous solutions that are probably due to the presence of oxygen‐containing groups bound to the surface of the nanotubes or to the impurities produced…
The biocompatibility of ethylene-vinyl acetate copolymer (EVAc), polyethylene (PE), and polyaniline (PANi) films in the emeraldine (EM), nigraniline (NA) and leucoemeraldine (LM) intrinsic oxidation states were assessed through subcutaneous implantation into male Sprague-Dawley rats beneath the dorsal skin, for a peri…
Monolithic Ka-band phase shifter circuit that employs voltage tunable BaSrTiO/sub 3/ (BST) parallel plate capacitors is presented here. The circuit is capable of continuous 0/spl deg/-157/spl deg/ phase shift at 30 GHz with an insertion loss of only 5.8 dB and return loss better than 12 dB. In addition to promising lo…