Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOdd-even effect in thermotropic liquid crystalline 4,4'-dihydroxy-2,2'-dimethylazoxybenzene-alkanedioic acid polymerAlexandre Blumstein and O. ThomasCite this: Macromolecules 1982, 15, 5, 1264–1267Publication Date (Print):September 1, 1982Publication History Published online…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMonomer sequence distributions in ethylene-1-hexene copolymersEric T. Hsieh and James C. RandallCite this: Macromolecules 1982, 15, 5, 1402–1406Publication Date (Print):September 1, 1982Publication History Published online1 May 2002Published inissue 1 September 1982https://p…
The formation of alpha alumina in gamma alumina obtained from ammonium alum was studied at 1150°C. The transformation occurs by a nucleation and growth process, preceded by an incubation time. Mechanical treatments of the gamma alumina markedly increase the density of nuclei and hence the transformation rate. The alph…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer films on electrodes. 8. Investigation of charge-transport mechanisms in Nafion polymer modified electrodesHenry S. White, Johna Leddy, and Allen J. BardCite this: J. Am. Chem. Soc. 1982, 104, 18, 4811–4817Publication Date (Print):September 1, 1982Publication History…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical and nonlinear optical characterization of molecularly doped thermotropic liquid crystalline polymersG. R. Meredith, J. VanDusen, and David J. WilliamsCite this: Macromolecules 1982, 15, 5, 1385–1389Publication Date (Print):September 1, 1982Publication History Publish…
Phase-transition properties of nematic liquid crystals aligned by a short-range, arbitrary-strength-substrate potential are examined in the framework of Landau---de Gennes theory. It is shown that the substrate potential, which can arise from surface treatment of liquid-crystal display cells, not only induces a bounda…
The authors review available experimental information on the existence, thermodynamic stability and physical properties of hydrides formed by the absorption of hydrogen gas in intermetallic compounds of two transition metals. The emphasis is on stability. It is shown that empirical models for the stability of ternary…
In the present work, the second of the new series initiated with industrial Portland cement of high initial resistance, there is studied the influence exerted by the addition of distinct quantities of groundgranulated slag to industrial Portland cement resistant to sulfate (cement 2 < > P-450-Y) in its chemical-resist…
In this paper, we emphasize that now it is possible to use some electrochemical non-destructive techniques for measuring the corrosion rate of the metals. Also, it is possible to use the gravimetric determinations if the appropriate instrumentation is not available. The simple visual observation is a good complementar…
As a consequence of the reconversion of coal in the cement industry, it is considered important to analyze the incorporation and transcendence of certain components in the clinkerisation process. Given in detail are the circuits of gases and volatile materials used in the baking process, emphasizing the interest of su…
This paper describes the chemical composition and the morfological nature of pulverized coal ashes, as well as their physical characteristics. Their influences —actions and effects— on the main properties and behaviour of cements and concretes, and the more adequate conditions for their efficient use un them are also…
The charge density in α-Al2O3 has been refined with respect to X-ray structure factors [complete spheres for both Mo Kα and Ag Kα radiations with (sin θ/λ)max = 1.19 and 1.495 Å-1 respectively] and electric-field gradient tensors at both atomic sites, using Hirshfeld- type deformation functions. Atomic charges from a…
Derek Hull 1981 Cambridge: Cambridge University Press x + 246 pp price £22.50 (£7.95 paperback) This book is based on a lecture course for final-year materials science and materials engineering students at Liverpool University. The author's declared aim is to encourage the use of composite materials by bridging the ga…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnnelides. 7. Discotic mesophases obtained from substituted metallophthalocyanines. Toward liquid crystalline one-dimensional conductorsChristian Piechocki, Jacques Simon, Antoine Skoulios, Daniel Guillon, and Patrick WeberCite this: J. Am. Chem. Soc. 1982, 104, 19, 5245–524…
Abstract New five complexes of the type of [RuL3−x(dmby)x]X2(x=1,2,3, L=2,2′-bipyridyl or 1,10-phenanthroline, dmby=3,3′-dimethyl-2,2′-bipyridyl, X=halide ion) have been synthesized in order to investigate the effects of two methyl groups of dmby on the absorption and emission spectra, luminescence quantum yields, and…
These proceedings of EXPLOMET 90, the International Conference on the Materials Effects of Shock-Wave and High-Strain-Rate Phenomena, held August 1990, in La Jolla, California, represent a global and up-to-date appraisal of this field. Contributions (more than 100) deal with high-strain-rate deforma
The dielectric, piezoelectric and elastic properties of 0.91(PbZn 1/3 Nb 2/3 )O 3 –0.09PbTiO 3 single crystals have been investigated as functions of temperature and applied electric field. Two multiple phase transitions at 68°C and 178°C, the crystal changing from the rhombohedral ferroelectric phase to tetragonal fe…
The low-energy part (<20 meV) of the ground-state magnetic excitation spectra of Ho 2 Co 17 and Ho 2 Fe 17 were found to consist of three modes: (i) a highly dispersive transition-metal mode; (ii) a non-dispersive local mode and (iii) a weakly dispersive mode degenerate with the local mode at the zone boundary. These…
By using an elastic body approximation, lattice vibrations of a small particle are discussed. Consideration of both vector fields and a scalar field yields the proper vibrational modes. Eigenfrequencies of the elastic vibrations are derived by considering circumstances surrounding a small particle: matrix effect, surf…