Materials Literature
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The molecule SiC2 in the circumstellar shell around the evolved star IRC + 10216 has been mapped using the Berkeley-Indiana- Maryland Array (BIMA) millimeter-wave interferometer. In this paper we present results of a full synthesis mapping of the 4<SUB>22</SUB>-3<SUB>21</SUB> transition of SiC2. This is an improvement…
This paper describes a phenomenological model of scalar magnetic hysteresis which is based on the similarity of the processes taking place when a magnetic material is magnetized along the branches of both the main and any minor hysteresis loops. This allows one to form any reversal curve by means of conjugation of the…
We study the electron dynamics in one-dimensional periodic and aperiodic (Thue-Morse) crystals. For the periodic chain the mean-square displacement ${\mathrm{\ensuremath{\sigma}}}^{2}$(t) and the integrated autocorrelation function C(t) of a quantum wave packet put on an initial site display unlimited ballistic motion…
The deficient perovskite LaNiO2.5 has been prepared in powder form with excellent crystallinity by controlled reduction of LaNiO3 with Zr metal in evacuated ampoules at 400 °C. The neutron powder diffraction pattern could be indexed in a monoclinic unit-cell corresponding to a superstructure of perovskite with dimensi…
Information on wood sorption behavior provides desorption and adsorption curves from the green and fully dry initial conditions, respectively. Wood in service, however, is exposed to only a narrow range of relative humidities (RH) and, therefore, should exhibit intermediate isotherms that are different from those of t…
Graphite powder was coated with a chelate compound of aluminum and heated at 500°C in air to prepare Al2O3-coated graphite powder. The sedimentation volume and the heat of immersion in water indicated that the wettability of the graphite powder by water was improved by the Al2O3 coating. The oxidation resistance of Al…
Partially inverted fine powders of zinc ferrite (ZnFe/sub 2/O/sub 4/) were produced by chemical aerogel synthesis. These powders showed magnetic ordering at temperatures to 250 K. Upon ball milling, a much higher inversion parameter was attained, yielding ferrimagnetic powders having small remanence and coercive field…
Microstructural modifications of collision interface in an explosively welded Ti/Ni clad were studied by transmission electron microscopy. Nonequilibrium phases such as amorphous and icosahedral quasicrystalline phases were synthesized and locked into the collision interface. These products were concluded to be the tr…
We report here the measurement of the magnetocaloric effect in a magnetic material with the use of noncontact type detection. The technique is based on the thermoacoustic principle. A sample with a periodically changing surface temperature induces exponentially decaying pressure waves which can be detected by a sensit…
An electrochemical route to poly(p-phenylenevinylenes)(PPVs) is described which involves cathodic cleavage of bis(dibromomethyl)arenes at a mercury pool cathode. Insoluble and organosoly PPVs are obtained in good yields and are characterised as regular and linear. Copolymers are obtained by co-electrolysis of differen…
The behavior and the effect of Al4SiC4, an excellent hydration-resistant compound, as an antioxidant for carbon-containing refractories have been investigated, and the corresponding mechanisms have been discussed. Al4SiC4 added to the refractories initially reacts with CO to form Al2O3, SiC and C. After the reaction,…
The surface chemical features and sintering behaviour of two preparations of tetragonal zirconia (t-ZrO2) stabilized with 3 mol % Y2O3 have been examined, and have been compared with those of a 2 mol% t-ZrO2 preparation and a monoclinic zirconia (m-ZrO2) preparation.The adsorption of CO2 indicates that the most peculi…
Hybrid structures have been applied in many areas such as textiles and composites. However, the mechanisms giving rise to the advantages associated with fiber blending, presumably due to the interactions between constituents of different types, are still poorly understood. This work is an attempt to look into the inte…
The use of the sol–gel synthesis method has been extended to include the preparation of stannates and antimonates from a citrate precursor. Samples of SrLaFeSnO6 and Sr2FeSbO6 have been prepared in a few hours. The structural and magnetic properties of the former are compared with those of a sample prepared over a per…
Results are reported of studies into some of the properties and forming behaviour of wood-polymer composite materials produced from natural wood by thermochemical manufacturing processes. The physico-mechanical properties, the moisture resistance, the bioresistance, the fire-resistance, and other operating properties…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAtomic force microscopy and high-resolution scanning electron microscopy study of the banded surface morphology of hydroxypropyl cellulose thin filmsSoumya S. Patnaik, Timothy J. Bunning, W. Wade Adams, J. Wang, and M. M. LabesCite this: Macromolecules 1995, 28, 1, 393–395Pu…
, Lewis Acid-Promoted Anionic Polymerization of a Monomer with High Cationic Polymerizability. Synthesis of Narrow Molecular Weight Distribution Polyoxetane and Polyoxetane-Poly(methyl methacrylate) Block Copolymer with Aluminum Porphyrin Initiators
Reaction diffusion in the Mg–Cu system has been investigated by an electron-probe microanalyzer. Two kinds of intermetallic compounds Mg2Cu and MgCu2 in the Mg–Cu diffusion couples were observed in the temperature range from 683 to 748 K. The Mg2Cu phase layer grows faster than MgCu2 phase layer. The growth rate of th…
The first examples of phthalocyanine linear mainchain polymers showing liquid crystal properties are described.
The deposition of platinum on various carbon blacks has been carried out by forming active functional groups on the surface of the carbon support, and exchanging these active groups with different platinum complexes. Using H2PtCl6 solution, an aggregation rather than an exchange takes place. In this case, the anionic…