Materials Literature
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Abstract SHS technology for immobilization of high-level radioactive wastes (HLWs) is based on combustion-assisted embedding of HLWs into chemically inert analogs of natural minerals used as preserving matrices of high chemical and radiation resistance. A pilot-scale production unit for SHS compaction of blocks up to…
„Äquatorialer“ Energietransfer: Der intramolekulare Energietransfer (EnT) in der Donor-Acceptor-Verbindung gezeigt ist von der Orientierung des Licht absorbierenden Substituenten abhängig; EnT wird nur ausgehend von der „peripher“ angeordneten Anthracen-Einheit beobachtet, nicht bei den beiden „axialen“.
Polymerization of p-(dimethylsilyl)phenylacetylene in toluene at 25 and 80°C using RhI(PPh3)3 as the catalyst afforded highly regio- and stereoregular poly(dimethylsilylene-1,4-phenylenevinylene)s (cis-3 a and trans-3 a) containing 98% cis- and 99% trans-vinylene moieties, respectively. Similarly, poly(butylmethylsily…
Template evolution from TPABr/silicalite powder was studied in a thermogravimetric analyzer as a function of heating rate and gas atmosphere to determine the maximum rate of weight loss and the temperature at which the rate of weight loss was a maximum. Through the application of TPD theory, the activation energies of…
Abstract A novel photochromic amorphous molecule (Spiro-BTE) based on bisthienylethene with a spirobifluorene linker has been synthesized. The relative high photochromic quantum yields were obtained for the Spiro-BTE and the switching stability was observed for more than 200 photochromic cycles. The introduction of th…
The microstructure of p-type (Bi,Sb)2Te3 and n-type Bi2(Te,Se)3 Peltier devices was investigated by scanning electron microscopy, energy-dispersive X-ray spectroscopy, electron probe microanalysis and transmission electron microscopy, in the bulk and close to the metal–semiconductor interface. The substitution of Sb f…
A 32-year-old woman underwent SWL of a 4 x 6-mm calculus in the distal third of the right ureter, receiving 2100 shocks at a maximum intensity of 18 kV. Approximately 1 month later, it was discovered that she had been 10 weeks pregnant at the time of SWL. She chose to continue the pregnancy and delivered a normal infa…
Abstract New intermolecular H-bonded liquid crystalline complexes, viz., 2-(p-n-heptyloxybenzylidene imi-no)-5-chloro-pyridine:p-/z-alkoxybenzoic acid; (HICP:nABA) (where n denotes the alkoxy carbon num bers 3 to 10 and 12) exhibiting smectic-F (n = 12) and smectic-G phases have been synthesized and char acterized b…
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…