Materials Literature
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SiC and Si3N4 materials were tested under various turbine engine combustion environments, chosen to represent either conventional fuel-lean or fuel-rich mixtures proposed for high speed aircraft. Representative CVD, sintered, and composite materials were evaluated in both furnace and high pressure burner rig exposure.…
ABSTRACT Different levels (5, 10, 15, 17.5 or 20% w/w of solid) of propyleneglycol alginate (PGA) were incorporated into soy protein isolate (SPI) films to form biodegradable composite films with modified physical properties. Color of the SPI films was affected (P<0.05) by the incorporation of PGA. Tensile strength…
The electromagnetic wave absorption properties of Ba M-type (BaFe/sub 12-x/(Ti/sub 0.5/Mn/sub 0.5/)/sub x/O/sub 19/) ferrite-epoxy resin composites were investigated. After measuring the complex permittivities of the samples, the regions of complex permeabilities in which the reflection loss (R.L.) becomes less than -…
The photochemistry under n→π* and π→π* excitation and the thermal isomerization of azobenzene are studied by a theoretical approach. Two mechanisms are considered: torsion around the N2N double bond and the inversion of one N atom. We optimize the most important geometries with CASSCF and we calculate the potential en…
The high‐ P , medium‐ T Pouébo terrane of the Pam Peninsula, northern New Caledonia includes barroisite‐ and glaucophane‐bearing eclogite and variably rehydrated equivalents. The metamorphic evolution of the Pouébo terrane is inferred from calculated P–T and P–T – X H2O pseudosections for bulk compositions appropriate…
Metal/zirconia catalysts have attracted considerable interest for the hydrogenation of carbon dioxide. Various preparation methods such as impregnation, co-precipitation, sol–gel synthesis, and controlled oxidation of amorphous metal alloys have been used, leading to catalysts with very different properties. The catal…
The magnetic critical behavior in the series ${\mathrm{La}}_{0.67}({\mathrm{Ba}}_{x}{\mathrm{Ca}}_{1\ensuremath{-}x}{)}_{0.33}{\mathrm{MnO}}_{3}$ $(0<~x<~1)$ of manganese perovskites is studied by means of dc magnetic measurements. In this series the ${\mathrm{Mn}}^{4+}{/\mathrm{M}\mathrm{n}}^{3+}$ ratio is kept…
In this paper the pendant drop method to measure interfacial tension between molten polymers is reviewed. A typical pendant drop apparatus is presented. The algorithms used to infer interfacial tension from the geometrical profile of the pendant drop are described in details, in particular a new routine to evaluate co…
The present study describes a novel method of preparing thermosensitive liposomes by compositional modification, incorporating a highly bilayer compatible lysolipid, 1 -Palmitoyl-2-Hydroxy-sn-Glycero-3-Phosphocholine (MPPC) into the gel phase liposomes composed of l,2-Dipalmitoyl-sn-Glycero-3-Phosphocholine (DPPC). Th…
New hexapyrrolic macrocycles have been synthesized and characterized by UV–VIS, mass and NMR spectroscopy and X-ray crystallography.
The influence of two Ti-precursors, TiO 2 (anatase) and H 2 TiO 3 (β-titanic acid), on the purity and particle size of BaTiO 3 powders prepared via hydrothermal synthesis is discussed. Amorphous H 2 TiO 3 was found to be an excellent Ti-precursor material and offers several advantages over crystalline anatase. Phase p…
Thiophene doping of supported gold catalysts increases the rate of formation of the unsaturated alcohol for the hydrogenation of the α,β-unsaturated aldehyde, crotonaldehyde, providing the first example of the promotion of gold by sulfur.
We have performed photoemission and inverse photoemission experiments on a series of 3d-transition-metal oxides with formal ionic configuration from to . The photoemission core-level spectra are analysed in terms of a simple cluster model leading to estimates for the charge-transfer energy , the Coulomb correlation en…
The viscoelastic behavior of block copolymer melts that exhibit a cubic phase has been examined by oscillatory shear experiments. A low frequency plateau in the measured storage modulus that is absent in the disordered phase is found for both gyroid and body-centered cubic sphere phases of diblock and triblock copolym…
Handbook of Fillers, Fourth Edition, discusses the rapidly advancing field of fillers, the substances added to plastics and composites that add value by improving and modifying the properties of materials and reducing costs. This new edition is an essential reference for engineers and scientists using fillers in a ran…
The use of mixed-oxides containing CeO2 as oxygen storage/release components is discussed with special focus on the applications of these materials in auto-exhaust catalytic converters. Ceria easily forms solid solutions with transition-metal/rare-earth oxides over a wide composition range. The incorporation of dopant…
The influence of the reaction parameters including temperature, oxygen concentration, and of in situ hydrogen reduction on the Pd catalyst activity towards complete methane oxidation is studied experimentally. Zero porosity α-alumina plates are used as a support for Pd catalyst. This lowers the influence of metal–supp…
The structural evolution and magnetic properties of nanostructured copper ferrite, CuFe 2 O 4 , have been investigated by x-ray diffraction, Mössbauer spectroscopy, and magnetization measurements. Nanometre-sized CuFe 2 O 4 particles with a partially inverted spinel structure were synthesized by high-energy ball milli…
The solid solutions La 2 Ni 1–x Fe x O 4+δ (x = 0.02 and 0.10), La 1.9 Sr 0.1 Ni 1 – x Fe x O 4 + δ (x = 0.02 and 0.10) and La 2 Ni 0.88 Fe 0.02 Cu 0.10 O 4+δ with the tetragonal K 2 NiF 4 -type structure were prepared by a standard ceramic technique. The thermal expansion coefficients of the ceramic materials, calcul…
The reconstruction of layered double hydroxides with the hydrotalcite-like structure from material previously calcined at increasing temperatures has been studied. Both the calcination temperature and the time the samples spent equilibrating with a controlled water vapour pressure have been considered. The crystallini…