Materials Literature
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When platinum materials are used for structural components in the high-temperature range, for example in the glass industry and in space technology, extremely high thermal, mechanical and chemical loadings arise. Apart from the solid solution hardened alloys, dispersion strengthened platinum materials have also been w…
In situ Raman spectroscopy was employed to investigate corrosion of a zirconium–niobium alloy in air-saturated water at a pressure of 15.5 MPa and temperatures ranging from 22 to 407 °C in an optically accessible flow cell. Monoclinic ZrO2 (m-ZrO2) was identified under all conditions after the coupon was heated to 255…
The long‐term high‐temperature cyclic oxidation (100 cycles, 10 4 h, 1500°C) of a Si 3 N 4 material and a Si 3 N 4 /MoSi 2 composite, both fabricated with Y 2 O 3 as a sintering additive, was studied. Both materials exhibited similar oxidation rates because of surface SiO 2 formation described by an almost parabolic l…
This paper is aimed to analyse the crystal size distribution (CSD) of hydroxyapatite (HA) Ca5 (OH)(PO4)3 obtained in a continuous flow MSMPR reactor at 85 °C and pHconstant = 9.0, at steady state. The kinetic of precipitation is calculated and the mechanism of particle formation is discussed. The method of moments in…
Monolithic zirconia–nickel (ZrO 2 /Ni) cermets have been prepared by a wet‐processing method with nickel volume concentrations of 16%–40%. Microstructural analysis performed on scanning electron microscopy images has revealed evidence of a partial ordering of metallic particles inside the ceramic matrix. This ordering…
The effect of a pretreatment sequence on several aluminium alloys was examined by X-ray photoelectron spectroscopy and SEM. The pretreatment consisted of vapour degreasing followed by a three step sequence comprising 1 min immersions in (a) nitric acid–hydrofluoric acid solution, (b) sodium hydroxide solution and (c)…
In an attempt to shed more light on the complex process by which cavities interact destructively with rigid boundaries we consider experimentally the interaction of a laser-generated bubble with a nearby solid boundary. To determine the stresses the surface of the boundary experiences, particularly during the final st…
Das Dieisen-substituierte Silicowolframat γ-SiW10{Fe3+(OH2)}2O386− (schematisch gezeigt) ist ein effektiver Katalysator für die Oxygenierung von Alkenen in homogener Lösung mit 1 atm O2. So betrugen bei der Epoxidierung von Cycloocten die Selektivität für Cyclooctenoxid 98 % und die Umsatzzahl 10 000. Der Katalysator…
The aim of this paper is to discuss the main features of the temperature-programmed reduction of high-surface-area ceria in the low-temperature range ( T < 900 K) with particular emphasis on the role of oxygen diffusion. By making use of a cell model for the reaction/diffusion process, it is shown that the observed ki…
Lasing in cholesteric liquid crystal (CLC) films doped with a mixture of laser dyes has been observed under UV excitation with 35ps pulses at 355nm. To probe optical interactions between molecules of different species, the emission and excitation spectra of the constituents have been studied in the 300–700nm range. Tw…
For decades, crystalline silicon (Si) has been the semiconductor of choice for the majority of applications in microelectronics. Recent advances in material science have focused attention on the silicon-on-insulator (SOI) platform, a submicrometer-thick layer of single crystal Si resting on an insulating silicon dioxi…
Syndiotactic poly(propylene)s (s-PPs) were freeze-dried from toluene solutions of various concentrations. FT-IR spectroscopy and wide-angle X-ray diffraction were used to characterize the s-PPs prepared. The isothermal crystallization behavior was also investigated by means of differential scanning calorimetry. The di…
Anisotropically nanostructured silicon layers exhibit a strong in-plane birefringence. Their optical anisotropy parameters are found to be extremely sensitive to the presence of dielectric substances inside of the pores. Polarization-resolved transmittance measurements provide an extremely sensitive tool to analyze th…
Abstract Rotational molding is a zero shear process used to manufacture hollow plastic parts. One disadvantage of this process is long cycle times, which are significantly affected by the sintering rates of thermoplastic powder. The objective of this work was to evaluate low molecular weight additives as sintering enh…
Thin C/SiC composites were fabricated by infiltrating a woven carbon fiber fabric with a slurry of SiC powder and polymer precursor for SiC, followed by heat treatment for pyrolysis. The effects of heat treatment parameters on the crystallization of the polymer‐derived SiC, the composite microstructure, and the transv…
Six garnet crystals with compositions close to the uvarovite-grossular binary from three different localities (Saranov, Veselovsk, and Saranka, Ural Mountains, Russia) were investigated by optical methods, electron microprobe analysis, and polarized UV-VIS-IR micro-spectroscopy. Under crossed polarizers the crystals d…
Abstract Over the years, an enormous amount of experimental results have been reported on damage accumulation (e.g. void swelling) in metals and alloys irradiated under vastly different recoil energy conditions. Unfortunately, however, very little is known either experimentally or theoretically about the effect of rec…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTThe Nematic Lateral Phase: A Novel Phase in Discotic Supramolecular AssembliesPaul H. J. Kouwer, Wolter F. Jager, Wim J. Mijs, and Stephen J. PickenView Author Information Delft University of Technology, Polymer Materials and Engine…
Raman spectra of as-spun fibers produced through electrospinning have shown that high S/N data can be obtained on 50-μm diameter fibers in relatively short collection times (25 s). Using this same instrumental approach, “real time” Raman spectra of the electrospinning liquid fiber jet at the origin of the jet and 1 cm…
The initial location of the stirrer in the emulsification vessel can induce the resulting emulsion type. The interpretation in terms of mixing phenomena leads to the use of the local water-to-oil ratio (WOR) concept in the formulation-composition map. The know-how associated with this phenomenology allows us to interp…