Materials Literature
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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…
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
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…
Catalytic oxidation of carbon monoxide has been investigated over a series of LaMn1 –xCuxO3(x= 0–0.5) and La2CuO4 catalysts having perovskite-type and perovskite-related structures. LaMn1 –xCuxO3 catalysts were prepared by a freeze-drying method and showed uniform compositions. The oxidation states of Cu and Mn of the…
The toxicity and efficacy properties of doxorubicin entrapped inside liposomes are sensitive to the physical characteristics of the vesicle carrier system. Studies addressing such relationships must use preparation procedures with the ability to independently vary vesicle size, lipid composition and drug to lipid rati…
During processing, wood-based composites are pressed using extreme heat and pressure for varying lengths of time. Evidence exists that the environmental conditions under which the wood densifies can alter the properties of both the solid wood and the composite product. Given the larger number and extreme nature of var…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAttempts at lithium single-ionic conduction by anchoring sulfonate anions as terminating groups of oligo(oxyethylene) side chains in comb-type polyphosphazenesYuji Tada, Moriyuki Sato, Noboru Takeno, Yoshifumi Nakacho, and Kiyotaka ShigeharaCite this: Chem. Mater. 1994, 6, 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMeasurement of the full refractive index tensor in sheared liquid-crystalline polymer solutionsK. Hongladarom and W. R. BurghardtCite this: Macromolecules 1994, 27, 2, 483–489Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inis…
Two thermoelectric materials, BiTe and BiSbTe were prepared by mechanical attrition of elemental powders in a rare gas atmosphere. Nearly 20 min were required for the alloying of BiTe, while 10 h were required for BiSbTe. After attrition, the average powder diameter of the BiSbTe alloy was in 1.4 μm, and the impurity…