Materials Literature
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The cationic copolymerization of tung oil with the divinylbenzene comonomer initiated by boron trifluoride diethyl etherate produces promising plastics. The gel times are largely dependent on the relative composition and the reaction conditions and vary from a few seconds to 1 h. Controlled reactions producing homogen…
Bis{4-[2-(4-pyridyl)ethenyl]benzoato}-zinc(II ) and -cadmium(II) with 8-fold diamondoid network structures have been synthesized under hydro(solvo)thermal conditions and exhibit powder second harmonic generation efficiencies comparable to that of technologically important lithium niobate.
Gaseous N2 has been efficiently introduced in the hollow cavities of aligned CNx nanotubes (15–80 nm od) by pyrolysing a jet (spray) solution of Fe(C5H5)2 and PhCH2NH2 in an Ar atmosphere at 850 °C; the aligned material consist of large arrays (2.5 cm2) of CNx (x < 0.05) ‘bamboo-like’ nanotubes (<100 μm in length); hi…
Solid‐state electrochemical cells with dense oriented thin film electrodes of (LSCO) were prepared on (100) surfaces of single‐crystal disks of yttria‐stabilized zirconia (YSZ) by the pulsed laser deposition technique. Oxygen exchange at the electrodes was studied with alternating current impedance spectroscopy under…
The types of structures formed when two or more cations occupy the sodium sites in the NaCl unit cell in a non-random manner are reviewed with reference to the cation arrangement in layers of close-packed octahedra and the cation arrangement in the NaCl subcell. Factors influencing the stability of particular structur…
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…