Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and elasticity of polyurethane networks. 5. Effect of diluent in the formation of model networks of poly(oxypropylene)triol and 4,4-methylenebis(phenyl isocyanate)Michal Ilavsky and Karel DusekCite this: Macromolecules 1986, 19, 8, 2139–2146Publication Date (Print)…
The acellular attachment organ (byssus) of the marine mussel Mytilus edulis L. is composed of threads that emanate from the body of the mussel to adhesive discs that anchor the threads to rocks, sand and other mussels. Three proteins have been purified by immunohistological methods and located to specific regions of t…
Abstract 1,1‐Dicyan‐2‐aryl‐1,8a‐dihydroazulene 6(a – g ) werden ausgehend von 8‐Methoxyheptafulven und Benzylidenmalonodinitrilen über Tetrahydroazulene 5 dargestellt. Die Dihydro‐azulene 6 lagern durch sichtbares Licht in 8‐(2,2‐Dicyan‐1‐arylvinyl)heptafulvene 7 um. Die Rückreaktion 7 → 6 erfolgt thermisch. Die chemi…
This paper is concerned primarily with the development of an analytic approach to the theory of steady-state velocity selection in the boundary-layer model of dendritic solidification. We consider the two-dimensional version of this model with a fourfold crystalline anisotropy \ensuremath{\alpha} in the surface tensio…
Abstract FT‐IR spectroscopy was used to collect spectra of γ‐aminopropyltriethoxy silane (γ‐APS) coupling agent deposited on KBr plates, modeling the silane interphase of composites, to study the effects of heating the γ‐APS film under various environmental conditions. This coupling agent is used in fiber‐reinforced e…
Synthesis of stable oxy‐ and oxyhydroxyapatkes [(Ca,M)‐Ap] was attempted by substitution of Ca 2+ with M 3+ (M = Al, Y) assuming the composition Ca 10‐x M x (PO 4 ) 6 (OH) 2‐x O x . Yttrium‐calcium oxyhydroxyapatite was successfully obtained. Its structure was analyzed and confirmed by X‐ray diffraction and infrared s…
The dopant distribution in nominally yttrium‐doped sapphire is characterized. The results indicate that virtually all of the intended dopant segregated to the surface of the crystal during growth. This implies that the solubility of yttrium in alumina is <10 ppm even at temperatures approaching the melting point of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSingle-crystal luminescence study of the layered compound potassium dicyanoaurateN. Nagasundaram, G. Roper, J. Biscoe, J. W. Chai, H. H. Patterson, N. Blom, and A. LudiCite this: Inorg. Chem. 1986, 25, 17, 2947–2951Publication Date (Print):August 1, 1986Publication History P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolvatochromism of the metal to ligand charge-transfer transitions of zerovalent tungsten carbonyl complexesDavid M. Manuta and Alistair J. LeesCite this: Inorg. Chem. 1986, 25, 18, 3212–3218Publication Date (Print):August 1, 1986Publication History Published online1 May 200…
The linearized Cahn–Hilliard theory of spinodal decomposition of binary mixtures is generalized to the case where there is a coupling to a slowly relaxing variable (e.g., phase separation of polymer mixtures near a glass transition, etc.). A very simplified model calculation is presented which shows that even in the v…
Trends in structural and magnetic parameters are presented and discussed for Nd2Fe14−xTxB with T=Cr, Mn, Co, Ni, Al. Some data are also included on the Y analog systems. Partial Al substitution strongly increases c/a. We show that this has to do with preferential occupation of the larger atom (Al) in the σFe layer. Co…
The influence of structural and chemical parameters on the singlet–triplet splitting (2J=ΔEST ) in modeled exchange coupled oxygen-bridged dimeric copper (II) complexes is studied, using an ab initio method followed by a perturbation development of the configuration interaction. The effect of varying the Cu–O–Cu′ angl…
Abstract The crystallization and thermal behaviour of crystallizable random propene/ethene copolymers (P‐ co ‐E) was systematically investigated. Index of crystallinity and, index of γ‐form, enthalpy and entropy of fusion, equilibrium melting temperature, spherulite growth rate, and overall kinetic rate constant were…
The high strength of some Al–Cu–Mg–Ag alloys has been attributed to very thin (~2·5 nm), but broad, hexagonal-shaped precipitates. Previous work has shown that the precipitates have a hexagonal unit cell, but different lattice parameters have been reported. In the present paper, the intensities of X-ray diffraction re…
The skin of the Norfolk spot, Leiostomus xanthurus, is composed largely of a crossed-helical array of collagen fibers. Over most of the body of the fish these are oriented at angles of 45-80° with the long axis of the fish. The skin of the skipjack tuna, Katsuwonus pelamis, also contains a crossed-helical array of col…
Most of the technologically important transducers are made of poled-polycrystalline lead zirconate--lead titanate Pb(Zr,Ti)${\mathrm{O}}_{3}$ compositions near the morphotropic phase boundary where the [Zr]:[Ti] ratio is approximately 1:1. The effect of elastic boundary conditions on single-domain stability and proper…
The nematic-isotropic phase transition of long flexible polymers using mean-field theory with the Maier-Saupe expression of the van der Waals interaction are described. The order parameter of nematic polymers is calculated as a function of reduced temperature, k B/T (a epsilon ) 1/2 , where a is the quadrupolar mean-f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structures and magnetic properties of .mu.-phenolato copper(II) binuclear complexes with hydroxo, azido, and cyanato-O exogenous bridgesTalal Mallah, Marie Laure Boillot, Olivier Kahn, Jacqueline Gouteron, Suzanne Jeannin, and Yves JeanninCite this: Inorg. Chem. 1986…
Abstract X-ray powder diffraction (XRD) studies of the clay fraction of Upper Cretaceous mudstones from a shallow (2.5 km) drill hole in the Niger delta indicate a high geothermal gradient (about 100°C/km) during diagenesis. The mineralogy of the clays is similar to that observed elsewhere and consists of interstratif…
Ionic conductivity data of yttria stabilized zirconia, , reported in the literature as functions of oxygen vacancy concentration, , and temperature, , have been analyzed according to a theoretical model developed in a previous paper (Paper 1) and applied to calcia stabilized zirconia. Because of the different charge c…