Materials Literature
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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…
Arrays of metal nanoparticles with well‐defined two‐ or three‐dimensional ordered structures in a solid matrix have many potential applications, e.g., novel optical gratings, data‐storage systems, and microelectronics. A synthetic method is described for preparing multilayer composite thin films with metal nanoparticl…
This paper examines the effect of testing speed on yarn-hairiness results. The number of hairs in different length groups and the S 3 values are considered in this study. The theoretical analysis shows that the projected hair lengths are influenced by fibre dimensions and rigidity, as well as by testing speed. For ins…
The structure of 1 to 80 layers of C 16 H 34 and C 17 H 36 n-alkanes adsorbed on graphite has been studied as a function of temperature using synchrotron X-ray radiation. The measurements confirm that a surface phase of two to four layers, distinct from the bulk adsorbed on the graphite, is formed at room temperature.…
Abstract The reaction of ReCl 4 with Te and TeCl 4 in a sealed evacuated glass ampoule at 230°C yields silvery, lustrous, moisture sensitive crystals of Te 8 [ReCl 6 ]. The crystal structure determination (monoclinic, C 2/ c , Z = 8, a = 1232.5(9) pm, b = 976.4(4) pm, c = 3114(2) pm, β = 90.85(5)°) shows, that the com…
Fine particles of dense, high-purity, crystalline BaTiO3were produced by flame-spray pyrolysis. A 0.5-M (Ba:Ti = 1:1) solution of barium acetate, titanium lactate, and water was aerosolized using an ultrasonic generator, and the droplets were delivered into the core of an annular diffusion flame (H2/air) reactor. For…
Polysulphones with cross-linkable pendant vinylbenzyl groups (PSF-VB) were prepared via chloromethylation of commercial polysulphones. The curing reactivity of PSF-VB was investigated by differential scanning calori-metry. Interpenetrating polymer networks (IPNs) were prepared based on bisphenol A diglycidyl ether (DG…
The effect of water on the reduction of nickel/alumina catalysts has been studied in relation to characterization of the catalysts by temperature-programmed reduction (TPR). It was demonstrated that the TPR spectra are strongly perturbed by water vapour, and special precautions must be taken to obtain results reflecti…
Parameters and/or processes responsible for the stability of catalyst supports and ceramic membranes are discussed. Two major parameters/processes were identified which are responsible for the stability of sol-gel derived nanostructured oxides at elevated temperatures. They are metastable-to-stable phase transformatio…