Materials Literature
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In this work, a methodology is proposed to predict the fracture behaviour of multilayer ceramic systems subjected to thermal shock conditions. The statistical variability exhibited by the fracture behaviour of three-layer structures used in solid oxide fuel cells under transient thermal stresses is determined. The dom…
Abstract The NO x species formed after NO adsorption and NO + O 2 co‐adsorption on Co‐ZSM‐5, CoY, Co/SiO 2 (high cobalt dispersion) and Co/SiO 2 (low cobalt dispersion) were studied by means of IR spectroscopy. It was found that NO adsorption on all samples leads to the formation of Co 2+ (NO) 2 species, which are sta…
We have measured the absorption spectra and the dispersion of refractive index for porous silicon samples with different porosities in the energy range 1.5–3.5 eV at room temperatures. The experimental data are compared with the dependences calculated by using Bruggeman’s theory for the dielectric constant of a multic…
Epitaxial thin films of a half-metallic ferromagnet Sr 2 FeMoO 6 have been grown on (001) SrTiO 3 , and MgO substrates by magnetron sputtering in Ar+H 2 mixture gas. Their structural, magnetic, magneto-optical and transport properties at room temperature were investigated and compared. Large difference has been observ…
This international standard specifies a method for calibrating the binding energy scales of x-ray photoelectron spectrometers, for general analytical purposes, using unmonochromated Al or Mg x-rays or monochromated Al x-rays. It is only applicable to instruments that have an ion gun for sputter cleaning. This internat…
Thermogravimetric and differential scanning calorimetric investigation of the thermal behavior of NH4+, Mn2+, Co2+, Ni2+ e Cu2+ morpholinedithiocarbamates were performed under nitrogen and air atmospheres in order to investigate the effect, in the thermal decomposition, of the presence of an oxygen as the heteroatom i…
A series of trifluoro-substituted benzoate derivatives: (S)-1-ethylheptyl 4-[4-(4-alkyloxy-3- fluorobenzoyloxy)-3-fluorobenzoyloxy]-2-fluorobenzoates is reported. The short chain members (n = 8 to n = 11) display a direct SmC*A-SmA transition, whereas for longer chains a SmC* phase appears, but no ferrielectric phases…
Preliminary results are reported on the first ferroelectric 'lyo-mesophases' of banana-shaped molecules. We studied the effect of the non-polar solvents p-xylene and m-xylene on the macroscopic properties of banana-shaped molecules having a B7 phase. It was observed that by adding only 15% of solvent the isotropic-B7…
Preparation, crystal structure and magnetic properties of a 3,5-dimethylpyrazolate bridged binuclear copper(II) complex [Cu 2 (L 1 )(3,5 prz)] (L 1 = 1,3-Bis(2-hydroxy-1-napthylideneamino) propan-2-ol) (1) are reported. Variable-temperature magnetic susceptibility measurements for a powdered sample of the complex were…
PLZT compositions near the morphotropic boundary phase (Zr/Ti = 53/47) were studied changing the lanthanum fraction from 0.5 to 14 at%. The grain size and the porosity due to the lanthanum addition showed an important influence on the dielectric properties of the samples. Dielectric and pyroelectric studies show that…
Behaviors of inclusion particles on the stainless‐steel melt surface were observed in real time by confocal laser microscopy, and theory of capillary interaction was introduced to explain the attractive behavior between some inclusion particles. Solid and semiliquid particles could attract and agglomerate by capillary…
We show that order parameter fluctuations in a good type-I superconductor or a liquid crystal always increase the size of the first-order transition. This behavior is eventually changed when the system crosses over to an inverted- XY critical behavior, with the size of the first-order transition vanishing as a power l…
A method for estimating nanoparticle size by determining the distribution function p(H n ) of hyperfine magnetic fields from data on the Mössbauer spectrum of 57Fe nuclei is described. The idea of the method stems from the fact that, owing to the breaking of exchange bonds for surface atoms, their contribution to the…
Cryo-ground tire rubber was treated with the sulfur oxidizing bacterium Thiobacillus ferrooxidans in order to devulcanize the surface of the ground particles. The devulcanized rubber (15% (w/w)) was mixed with carbon black filled natural rubber, and subsequently vulcanized. The physical properties of the resulting mat…
Abstract Colloidally stable latex blends of natural rubber (NR) and poly(methyl methacrylate) (PMMA) latexes containing up to 50 wt.% PMMA can be prepared by mixing commercial NR ammoniated latex concentrate and monodisperse PMMA latex dispersion. The clarity and tackiness of the films obtained depend on the PMMA cont…
Sintering studies were conducted using kaolin, metakaolin, zeolite 4A, and various synthetic mixtures of Al 2 O 3 and SiO 2 in the presence of Li 2 CO 3 and LiCl as fluxing agents. Various compositions of the above were prepared, and conventional sintering studies were conducted at temperatures of 900°–1450°C with soa…
Das Standard-Wärmedämmschichtmaterial Ytttriumoxid-stabilisiertes Zirkonoxid (YSZ) ist für den Langzeiteinsatz auf eine maximale Temperatur von etwa 1200°C beschränkt. Dementsprechend kann ein weiterer Anstieg der Gaseinlaßtemperatur und damit der Effizienz von Gasturbinen kaum mit YSZ-Beschichtungen erreicht werden.…
Low optical bandgap conjugated polymers may improve the efficiency of organic photovoltaic devices by increasing the absorption in the visible and near infrared region of the solar spectrum. Here we demonstrate that condensation polymerization of 2,5-bis(5-trimethylstannyl-2-thienyl)-N-dodecylpyrrole and 4,7-dibromo-2…
Electrical conductivity measurements in the range 50–300 K have been carried out on gold–fluorocarbon–polymer composite films. Such measurements have been performed on samples with different percentages in volume of gold, before and after thermal annealing up to 450 K. The experimental temperature dependence of conduc…
The pretilt angle and the anchoring strength are important parameters in liquid crystal displays (LCDs). However, in the case of amorphous LCDs (a-LCDs), it is difficult to evaluate these parameters by means of conventional measurement method due to non-uniformity of the LC directors. In this paper, we report the simu…