Materials Literature
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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…
In contrast to the nitrosyl derivative of iron(II) octaethylporphyrin [Fe(oep)(NO)], the isostructural octaethyltetraazaporphyrin complex [Fe(oetap)(NO)] exhibits fast ligand-promoted nitric oxide dissociation in the presence of pyridine and N-methylimidazole.
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of Regioregular π-Conjugated Poly(thienyleneethynylene) with a Hindered Phenolic SubstituentHideki Hayashi and Takakazu YamamotoView Author Information Research Laboratory of Resources Utilization, Tokyo Institute of Techn…
Reduction of Na 2 MoO 4 with NaBH 4 in aqueous solutions at ambient temperatures has been investigated systematically by varying the concentration and volume of NaBH 4 as well as the reaction pH. The reduction products have been characterized by X-ray diffraction and differential scanning calorimetry (DSC). The reduct…
A two-dimensional array of 10 nm gold colloidal particles is formed by a submonolayer deposition technique using a bifunctional aminosilane followed by a mobility-restoration treatment with alkanethiol, converting the disordered submonolayer deposition to a highly-ordered two-dimensional array.
A novel cylindrical mirror analyser (CMA) has been used to obtain true spectra using Auger electron spectroscopy (AES) on Au, Ag and Cu. The whole energy distribution for the primary accelerating voltages, ranging from 1 V through to 5000 V, was measured absolutely. Even faint spectra which have not been cited in Auge…
Two new crystalline charge-transfer salts of BEDT-TTF [bis(ethylenedithio)tetrathiafulvalene] containing hexachlorometallate anions of 5d elements have been synthesised, characterised structurally and their magnetic and conducting behaviour investigated. α-(BEDT-TTF) 4 [ReCl 6 ]C 6 H 5 CN is triclinic [P; a=9.455(2),…
The applicability of ASTM Test Method for Shear Strength of Continuous Fiber-Reinforced Advanced Ceramics at Ambient Temperatures (C 1292) was investigated to determine the shear strength of one-dimensional and two-dimensional continuous fiber-reinforced ceramic composites. The advantages and disadvantages of the test…
The frequency of occurrence of paint chips and glass fragments on the outer clothing and footwear of 213 high school students from different areas of the city of Vancouver was determined. Paint and glass respectively were found on ca. 14% and 2% of the outer clothing items, and on ca. 24% and 5% of footwear. These fig…
3 The chemical bonding at a grain boundary of an Fe-doped SrTiO bicrystal 3 has been determined by a combination of spatially resolved electron energy-loss spectroscopy and a first-principles molecular-orbital calculation. The near-edge structure of the O K-edge spectrum on the boundary shows that the manner of the Ti…
13 C NMR spin–lattice relaxation times T 1 are used to investigate the effect of low molecular weight diluents, including N,N-dimethylformamide, N-methylformamide, propylene carbonate, γ-butyrolactone, triglyme and tetraglyme, on the local polymer segmental motion in polyether–urethane networks. In all cases, an incre…