Materials Literature
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Magic bubbles: ZnSe semiconductor microspheres aggregated from nanocrystals of tunable size have been successfully synthesized for the first time by use of gas bubbles. Based on the interior nanocrystal size and structure, the as-obtained samples exhibit different colors.
▪ Abstract After a brief survey of fuel cell types, attention is focused on material requirements for SOFC and PEMFC stacks, with an introductory section on materials technology for reformers. Materials cost and processing, together with durability issues, are emphasized as these now dominate materials selection proce…
▪ Abstract The performance of the oxide-ion electrolyte of a solid oxide fuel cell (SOFC) is critical to the development of an intermediate-temperature system. Although yttria-stabilized zirconia is the electrolyte used in SOFCs under commercial development, other candidate materials are now available, and there remai…
▪ Abstract This account reviews the discovery, synthesis, properties, and the latest research advances of carbon nanotubes developed over the past 12 years. Because of their remarkable electronic and mechanical properties, carbon nanotubes are unique and exciting. The field has been developed rapidly, and the number o…
Homogeneous and dense arrays of ZnO nanowires were synthesized on silicon wafers (and many other substrates) using a mild solution process at 90 °C. Uniform ZnO nanocrystals were deposited to act as seeds for subsequent hydrothermal nanowire growth, which yielded single-crystalline ZnO nanowires grown along the [0001]…
▪ Abstract The structural and chemical parameters determining the formation and mobility of protonic defects in oxides are discussed, and the paramount role of high-molar volume, coordination numbers, and symmetry are emphasized. Symmetry also relates to the structural and chemical matching of the acceptor dopant. Y-d…
Raphionacme Harv. is a genus of mostly geophytic herbaceous plants, numbering 37 species and, with the exception of one species, all endemic to Africa. In southern Africa (Botswana, Lesotho, Namibia, South Africa and Swaziland) a total of 16 species are recognised by the present author, although no less than 27 specie…
Ground powders of Nd 2 Fe 14 B sintered magnets (particle size = 46–125 µm in diameter) were coated and alloyed by sorbing Yb metal vapor at 550–850°C. A significant recovery of remanence ( B r ), coercivity ( H cj ) and maximum energy product (( B H ) max ) values was observed in the resulting Yb/Nd 2 Fe 14 B powders…
The dielectric response of the mixed crystal system, (CH3NH3)5Bi2Cl7.26Br3.74 (MAPCBB34) and (CH3NH3)5Bi2Cl6.6Br4.4 (MAPCBB40), in the frequency range between 500 Hz and 1 GHz is investigated in the vicinity of para-ferroelectric phase transition. The ferroelectric phase transition temperatures (Tc) found for MAPCBB34…
EUROPEAN resin producer DSM Composite Resins has developed a carbon fibre sheet moulding compound (SMC) for use in making low weight semi-structural and structural automotive components. This is a short news story only. Visit www.reinforcedplastics.com for the latest plastics industry news.
Abstract Cyclic voltammetry was employed to investigate the electrochemical behavior of numerous cyclopentadienyliron (CpFe + ) and pentamethyl‐cyclopentadienylruthenium (Cp*Ru + ) coordinated oligomers and polymers. The electrochemical behavior of the iron systems indicated the cyclopentadienyliron complexes had isol…
High-voltage porcelain insulators are subjected through a series of ‘simulation’ and ‘accelerated aging’ tests in order to minimize the chances for line failure. Failure analyses conducted in the laboratory indicate that the damages are generally due to (i) local melting and evaporation of materials from the grain bou…
New homologous series of N-[4-(4-n-alkoxybenzoyloxy)-2-hydroxybenzylidene]-3-aminopyridines were synthesized, they exhibited a nematic phase. The temperature dependence of their Raman spectra has been observed in the spectral range 900–1800 cm−1. Some Raman bands show a marked change in their intensity and frequency t…
Abstract Recently, experimental studies on the dynamical structure of liquid metals have been actively carried out by the inelastic X-ray scattering (IXS) technique using the synchrotron radiation which have stimulated theoretical studies. In this paper, recent progress in theoretical studies on the dynamical structur…
Este trabalho tem como objetivo avaliar a degradação térmica e fotooxidativa do terpolímero poli (acrilonitrila-butadieno-estireno), ABS, utilizado em componentes internos de automóveis. Corpos de prova de ABS moldados por injeção foram submetidos ao envelhecimento térmico, segundo a norma ASTM D794, e ao envelhecimen…
The inhibition of copper corrosion in 1.5% sodium chloride solution was studied at 25, 35 and 45°C using different concentrations of thiosemicarbazide, p-methoxyphenyl isothiocyanate, p-methylphenyl isothiocyanate and p-chlorophenyl isothiocyanate and their corresponding condensation products with thiosemicarbazide. T…
A diagrammatic technique developed for Green’s functions with inclusion of multiphonon processes is used to investigate the electronic energy levels and the phonon replicas corresponding to them in a semiconductor quantum dot (QD) embedded in a dielectric matrix. It is shown, with reference to GaAs, CdSe, and CuCl qua…
We report an observation of triple-like P–E hysteresis loops and an electric field-induced tetragonal–orthorhombic phase transition in the 0.62Pb(Mg1/3Nb2/3)O3–0.38PbTiO3 single crystal. The stability of the induced orthorhombic phase was studied as a function of temperature and electric field, which is applied along…
AECL uses the MAAP CANDU code to calculate the progression of a severe core damage accident in a CANDU reactor to support Level 2 Probabilistic Safety Assessment and Severe Accident Management activities. Experimental data are required to ensure that the core damage models used in MAAP CANDU code are adequate. In SMiR…
The present effort addresses the application of sustainability criteria to the design of "heat sinks" used to cool advanced microelectronic components. The sustainability assessment is based on several criteria, including the use of natural resources, the environment, social welfare, and economic impact. The developme…