Materials Literature
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Reaction of zinc 5,15-bis(3,5-di-tert-butylphenyl)porphyrin with S-(trifluoromethyl)-3,7-dinitrobenzothiophene trifluoromethanesulfonate in tetrahydrofuran gave the 10-trifluoromethylated compound as the major product and 2-CF3- and 10,20-di-CF3-porphyrins as the minor products. The direct trifluoromethylation is effe…
Abstract Previous work on growth‐rate dispersion has shown how to calculate crystal‐size distributions when the growth‐rate distribution is known and how to calculate the growth rate distribution when the crystal‐size distribution is known. There is a significant lack of information, however, on how growth‐rate disper…
A new approach for phosphor-based temperature determination is presented. This method is based on comparison between the spectrally resolved phosphorescent emission and a database of spectra collected at a series of temperatures. Applications of two phosphor materials, Gd 2 O 2 S: Tb and Mg 4 (F)GeO 6 : Mn, possessing…
Abstract The mechanical properties of poly(vinyl chloride) (PVC)/styrene‐butadiene rubber (SBR) blends compatibilized by acrylonitrile‐butadiene rubber (NBR) were studied. A sulfur curing system was employed to crosslink the rubber of the blends. In the case of the blends without any curing agents, an increase in NBR…
The desmutting of 2024-T3 aluminium alloy using a new rare earth desmutting solution has been studied by SEM and X-ray photoelectron spectroscopy (XPS). It was evident from SEM that, during desmutting, there was dissolution and etching of both the intermetallics and the basic oxide scale left after alkaline cleaning.…
We have investigated the energy band structure of single crystals of n-type Bi 2- x Sb x Se 3 (0.2 ≤ x ≤ 0.52), p-type In x Bi 2- x Te 3 (0 ≤ x ≤ 0.1) and p-type Sb 2 Te 1.2 Se 1.8 by cyclotron resonance in high magnetic fields up to 150 T. In n-type Bi 2- x Sb x Se 3 , two resonance peaks were observed corresponding…
Co-Phthalocyanine complex was immobilized on 3-n-propylimidazole groups grafted on a porous SiO2 surface (specific surface area S BET = 500 m² g-1) and efficiently electrocatalyzed the oxalic acid oxidation on a carbon paste electrode surface made of this material. Intermolecular interactions of the complex species wh…
Reports the effects of composition and curing temperature on the film properties of three water reducible enamels prepared from palm stearin alkyds. The properties studied were hardness, flexibility, and adhesion. While all the formulations exhibit excellent adhesion, generally increasing the melamine content and curi…
Over recent years, attention has been focused on the development of ferritically hot rolled steels, despite the inherently low drawability attributed to the formation of a (110) texture just below the strip surface. This texture, which cannot be removed by further processing, prevents the formation of the (222) compre…
The high sinter activity of alumina nanoparticles was used to bond coarse-grained corundum ceramics. The employed nanopowder was generated by the evaporation of solid corundum rods using the radiation of a Nd : YAG-laser followed by condensation of the vapour in a controlled atmosphere. Some nanopowder was sandwiched…
Protease inhibitor 1 (α1-antitrypsin; AT) is the main serum inhibitor of proteolytic enzymes. In AT deficiency, enzymes such as neutrophil elastase can damage the lung tissues, leading to pulmonary emphysema. More than 90 different alleles have been identified to date for the protease inhibitor 1 gene (PI). The three…
Khmaralite, Ca 0.04 Mg 5.46 Fe 3+ 0.12 Fe 2+ 1.87 Al 14.26 Be 1 . 43 B 0.02 Si 4.80 O 40 , is a new mineral closely related to sapphirine from Khmara Bay, Enderby Land, Antarctica. It occurs in a pegmatite metamorphosed at T ≥ 820 ℃, P ≥ 10 kbar. The minerals surinamite, musgravite, and sillimanite associated with khm…
A study of solidification phenomena performed under industrial conditions is presented. The solidification structure of high carbon, medium carbon and microalloyed steel grades was observed and correlated to casting parameters such as superheat and secondary cooling. Experimental data of dendrite morphology are relate…
In this paper, the numerical simulation for the in situ degradation of toxic water pollutants in the presence of semiconductor catalyst particles is considered. The computer simulation is in search of an efficient photocatalytic reactor design to achieve better fluid-catalyst contacting to minimize mass transfer limit…
Abstract A series of blends consisting of polylactic acid (PLA) and aliphatic succinate polyester (Bionolle#3000) have been prepared. The results of the mechanical property investigation have shown that using more than 20 wt % Bionolle#3000 can significantly increase the toughness of the PLA, increase the elongation a…
Interdiffusion in Sc‐doped and Ta‐doped BaTiO 3 ‐BaZrO 3 perovskites was examined, both theoretically and experimentally. Analytical expressions for the lattice velocity, v , and the interdiffusion coefficient, D̃ , were obtained. The v and the D̃ were numerically evaluated as a function of dopant type (trivalent‐acce…
The Mode I fracture toughness ( K I C ) of a small‐grained Si 3 N 4 was determined as a function of hot‐pressing orientation, temperature, testing atmosphere, and crack length using the single‐edge precracked beam method. The diameter of the Si 3 N 4 grains was <0.4 µm, with aspect ratios of 2–8. K I C at 25°C was…
The dynamical electrooptic (EO) response of mesogenic side-chain polymer-stabilized ferroelectric liquid crystal cells has been investigated based on the continuum theory. From numerical calculations, the transition from the bistable EO response to the monostable EO response for pulse-applied voltages is clearly demon…
Many of the cultivated soils of sub‐Saharan Africa typically have a surface horizon low in clay and with a low cation exchange capacity (CEC). In these soils, CEC is largely due to the soil organic matter (SOM). Measurements made on long‐term trials show that changes in CEC and SOM are positively correlated to one ano…
The effects of amino acid substitutions in the N-terminus of bovine recombinant alpha-lactalbumin (including enzymatic removal of the N-terminal methionine and deletion of Glu-1) were studied by intrinsic fluorescence, circular dichroism (CD), and differential scanning microcalorimetry (DSC). Wild-type recombinant alp…