Materials Literature
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The initial development and growth of defects from ‘engineered’ surfaces, i.e. fine abraded, polished, shot peened etc., often dominates the resulting component lifetime, particularly for materials of high strength and limited ductility. When subject to the conjoint action of stress and environment this lifetime is im…
The compositional gradient and ion selectivity in the final protective rust layer of the Cr-substituted goethite, α-(Fe1-x, Crx) OOH, on a weathering steel have been discussed by examining the spontaneously and artificially formed Cr-substituted goethites. It was found that the Cr content in the spontaneously formed f…
The breakdown of intact collagen from bone or hide to produce commercial gelatin results in a poll/disperse product with respect to molecular weight. The mechanism of this breakdown and the role of the individual collagen chains in gel formation is not clearly understood.Analysis of these polypeptide chains for molecu…
Abstract Blaues, diamagnetisches Di(iridiumphthalo cyaninat(2), [(Irpc 2− ) 2 ] wird durch kontrollierten thermischen Abbau von Di(acido)phthalocyaninatoiridaten in einem inerten, hochsiedenden Lösungsmittel wie 1‐Chlor‐naphthalin oder unter vermindertem Druck (T < 350°C) dar gestellt. Es ist in Pyridin (py) unter…
A method is described for synthesising complex silicon lanthanide nitrides by carbothermal reduction and nitridation (CRN) of both SiO 2 –Ln 2 O 3 mixtures and elemental Si–Ln 2 O 3 mixtures at 1400–1450 °C. Syntheses in the Si 3 N 4 –YN system confirm the existence of the compounds YSi 3 N 5 and Y 2 Si 3 N 6 , which…
A significant enhancement of the selective reduction of nitrogen oxide by H 2 is produced in the presence of oxygen over Au/NaY and Au/ZSM-5 catalysts by forming NO 2 and N 2 O 4 intermediates, which are eventually reduced to N 2 .
Poly(β-phenethyl L-aspartate) (PPLA) takes the right-handed α-helical form in 1,1,2,2-tetrachloroethane at moderate temperatures. The transition to the left-handed α-helix occurs at around 85°C in the isotropic solution as well as in the lyotropic liquid crystalline state. In the presence of a denaturant acid, PPLA al…
In situ FTIR spectra of adsorbed CO on CrO3/SiO2 catalysts have been investigated at elevated temperatures to elucidate the nature of the species formed during the reduction process with CO. The results show the formation of three species: bicarbonates, monodentate carbonate and inorganic carboxylate. The reduction of…
The mechanisms responsible for the extremely high Hall-Petch slope of Ky ≈ 5MPa m½, for grain sizes d in the range 3000–200 μm, in fully lamellar (FL) and nearly lamellar (NL) TiAl microstructures are explored. It is shown that the constraints exerted by the neighbouring crystals, particularly those oriented in the ha…
A simple rapid solution-based method for forming the oxide layer at porous silicon is described which uses amphiphilic molecules to wet the hydrophobic porous structure.
We examined the effect of added MoO/sub 3/ on the initial permeability and other material characteristics in order to develop Mn-Zn ferrites with a high permeability. It was found that although MoO/sub 3/ addition could expand the diameters of crystalline grains, it could also promote porosity, thereby impeding grain…
An enhancement of the Curie temperature, T/sub c/, was deduced from ac-susceptibility measurements on the R/sub 2/Fe/sub 14/B (R=Nd and Pr) phase for exchange coupled nanocrystalline magnets with respect to corresponding microcrystalline magnets.
Enhanced thermal stability and textural properties can be induced into pillared interlayered clays when aluminium oligomers are intercalated into the Ca2+ form of montmorillonite clay using ultrasonics within 20 min at ambient temperature.
Peer reviewed
A heavily deformed Cu-Cr in situ composite is quite promising as a material with high strength and high conductivity. In order to make clear the strengthening mechanism of the Cu-Cr in-situ composite, the Cu-15 mass%Cr composite wire, fabricated by the conventional process from the ingot, was investigated in terms of…
Corrosion tests were conducted at two environments in an iodine-sulfur thermochemical water-splitting process. One is 50wt% sulfuric acid solution containing 0.1wt% hydriodic acid at 95°C and 120°C, and the other is gaseous mixture of HI/I2/H2O, the molar ratio of which is 1/1/6, at 200-400°C. In the former environmen…
Electron diffraction studies of a [(dioctadecyl)carbamoylmethyl]guanidinium toluene-p-sulfonate (DG) monolayer reveal that the regularity of the molecular arrangement and the size of crystalline domains are controlled through binding of aqueous α,ω-dicarboxylates with various spacer lengths.
Systematic theoretical studies for the mechanisms of the epoxidation and complete oxidation of ethylene and propylene over silver surface as well as the reactivity and the stability of oxygen species on Cu, Ag, and Au surfaces have been presented. The dipped adcluster model (DAM) combined with the ab initio Hartree–Fo…
Nd-doped BaCeO 3 have been obtained from homogeneous coprecipitated oxalates when calcined at temperatures T≥1000 °C. Ball-milling of the calcined powders well disperses the agglomerates and consequently has a beneficial effect in the densification process. The calcination temperature has a major influence on the sint…
Photoemission through thin coating films was studied in the scope of protection of sensitive photocathodes. The transmission of low energy (∼1 eV) electrons was measured for a large number of dielectric films (LiF, NaF, CsF, NaI, MgF2, BaF2, SiO, SiO2, Al2O3, n-C36H74), evaporated in vacuum on CsI and CuI photocathode…