Materials Literature
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The crystal structures of (NaLa)(MW)O 6 (M=Co, Ni) suggest that both adopt a monoclinic perovskite-type structure [M=Co: a=5.546(3), b=5.545(4), c=7.903(6) Å, β=89.99(3)°; M=Ni: a=5.517(5), b=5.518(7), c=7.862(2) Å, β=90.02(4)°; space group P2 1 /m]. The structure consists of an ordered arrangement of MO 6 and WO 6 oc…
The effect of resorcinol formaldehyde (RF) resin on the stability of the adhesion interphase between rubber compounds containing different amounts of RF resin and the thin brass film deposited on a glass plate was investigated under the conditions of humidity aging. The depth profiles of the adhesion interphase were e…
The molecular dipole moment and vector component of the hyperpolarisability of 4-[N,N-bis(2-acetoxyethyl)amino]phenyl-1-azo-2′ -(3′,5′-dinitrothiophene) have been calculated using a semi-empirical approach and the results compared with experimental measurements in solution. The calculated values are found to be highly…
The isothermal phase relations for the MnO-SiO2-TiO2 system have been investigated at 1673 K by a chemical equilibration technique. Iso-activity curves for MnO are drawn from the experimental results of the activities as well as those for SiO2 and TiO2 calculated by Schuhmann's tangent intercept procedure.1) Iso-activ…
Gas-phase deposition and subsequent thermal activation of Cr(acac) 3 on the surface of fumed and precipitated alumina supports have been studied by diffuse reflectance FTIR spectroscopy, TG–DTG, TPO and chemical analysis. It has been found that stabilisation of Cr(acac) 3 on alumina occurs in a molecular form owing to…
Abstract Die Iodoplumbate (Me 3 NC 2 H 4 NMe 3 ) 2 [Pb 3 I 10 ] ( 1 ) bzw. (Me 3 NC 3 H 6 NMe 3 ) 3 [Pb 3 I 9 ] 2 ( 2 ) und (Me 3 NC 3 H 6 NMe 3 ) 2 [Pb 3 I 10 ] ( 3 ) bilden sich bei der Umsetzung von PbI 2 mit NaI und (Me 3 NC 2 H 4 NMe 3 )(PF 6 ) 2 oder (Me 3 NC 3 H 6 NMe 3 )(PF 6 ) 2 in DMF. In 1 und 2 s…
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