Materials Literature
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A porphyrin with two acrylic acid substituents on the same pyrrole ring was synthesized using a ‘3 + 1’ type procedure; the electronic state of the porphyrin macrocycle was strongly affected by their presence.
Molten decane-1,10-dicarboxylic acid, sebacic acid, reacted with the layered double hydroxide (LDH) of initial composition Mg6Al3.4(OH)18.82(CO3)1.51(NO3)0.364.5H2O, at a temperature of 150 °C which is ca. 24 °C above the melting point of the acid. The reaction was not strongly exothermic and hence may be controlled b…
A detailed examination of the aging processes, that may take place in solid-dielectric extruded-type high voltage transmission cables under dry conditions, is presented. Particular emphasis is placed on the aging process as affected by the separate and simultaneous action of four main aging factors, namely the electri…
A corrosion optimized Zircaloy has to be based primarily on in-boiling water reactor (in-BWR) results. Therefore, the material parameters affecting corrosion were deduced from results of experimental fuel rod irradiation with systematic variations and from a large variety of material coupons exposed in water rods up t…
It is well known that solid hydrophobic particles can reduce foaming, and this fact is used in formulating industrial antifoam preparations. The work to be described has centred on the acquisition of unambiguous experimental data on well-defined systems in order to probe the role of the contact angle, Θ, between parti…
The present work investigates the dynamics of a cluster of bubbles in a liquid by means of a series expansion of spherical harmonics. The governing equations of three-dimensional motions for an arbitrary configuration of N bubbles are derived by taking account of the translational motion and the deformation of each bu…
A general method for the preparation of early transition metal porphyrin halide complexes using a porphyrin dianion, (THFhLh(POR) (POR = OEP, TIP; OEP = octaethylporphyrinato, TTP = meso-tetra-p-tolylporphyrinato), and the appropriate metal halide complex, MXn (MXn = VCh(THFh, TiCl4(THFh, TiC13(THFh, MoCl4(CH3CNh, WC1…
Irradiation of lycopene in an atmosphere of oxygen and in the presence of a sensitizer (methylene blue) led to the formation of 2-methyl-2-hepten-6-one and apo-6’-lycopenal. A reaction pathway via a dioxetane intermediate is proposed.
The validity of the scratch test as a method of assessing the adhesion of diamond-like carbon (DLC) on polymers has been studied. Sheets of 12 μm thick polyethylene terephthalate (PET) and 100 μm thick polypropylene (PP) were adhesively bonded to glass slides in order to perform the scratch tests. The critical load is…
Fuel rods clad with Zircaloy-4 with varying tin contents (1.33 to 1.58% Sn) and annealing parameters (1.0 to 4.1 × 1017 h with Q/R = 40 000°K) were irradiated in demonstration fuel assemblies in a high-temperature pressurized water reactor (PWR) to burnups in excess of 35 giga watt days per metric ton of uranium (GWd/…
We report properties of five active site mutants of Escherichia coli citrate synthase, in which histidine 264, aspartate 362, and phenylalanine 383 were replaced by alanines, and arginines 387 and 407 by leucines. All mutants have much lower turnover numbers than wild type enzyme; the strongest effect was with the arg…
Quantitative texture analysis based on the calculation of crystallite orientation distribution functions (ODF) is necessary to accurately evaluate physical and mechanical anisotropies of polycrystal materials. In the ODF calculation, an analytical method using incomplete pole figures measured by the reflection method…
Precursor properties of Sr(thd)2(thd = 2,2,6,6-tetramethyl heptane-3,5-dione) have been investigated using in situ mass monitoring of thin films during atomic layer epitaxy growth cycles. H2O and H2S were used as the other source materials. The Sr(thd)2 source temperature, Ts, significantly affects the growth rate. At…
Tri(biphenyl-4-yl)amine is found to constitute a new class of photo- and electro-active amorphous molecular materials. The material readily forms an amorphous glass with a glass-transition temperature of 76 °C, as characterized by differential scanning calorimetry, X-ray diffraction and Raman spectroscopy. Its glass-f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIncorporation of carbon into palladium during low-temperature disproportionation of carbon monoxide over palladium/zirconia prepared from glassy palladium-zirconiumM. Maciejewski and A. BaikerCite this: J. Phys. Chem. 1994, 98, 1, 285–290Publication Date (Print):January 1, 1…
In this paper operational definitions of the glass transition and the pertinent condensed phases are given. This is followed by a description of the basic observations of glass transitions via thermal analysis using calorimetry, dilatometry, as well as theromechanical, dielectric, and dynamic mechanical analysis. The…
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Results of electric strength tests performed on specimens cut from aged and unaged EPR-insulated HV cables are processed by the two and three parameter Weibull function. It is shown that the latter often fits the experimental data better than the former, but the difference is not significant, except, in a few cases, f…
A hydrophilic conjugated polymer with a bandgap of 1.2 eV has been obtained by electropolymerization of 4,4-ethylenedioxy-4H-cyclopenta[2,1-b;3,4-b′]dithiophene.
The effect of Zr, Sn, Nb, Ta, Pd, N and O on the corrosion resistance of titanium alloys for medical implants was investigated by measuring the anodic polarization curves at 310 K in 5 mass% H2SO4 and 5%HCl solutions deaerated by high-purity N2 gas bubbling. The critical current density for passivation (Ic) and passiv…