Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence and intramolecular energy-transfer processes in isomeric cyano-bridged rhenium(I)-rhenium(I) and rhenium(I)-ruthenium(II)-rhenium(I) polypyridyl complexesK. Kalyanasundaram, M. Graetzel, and M. K. NazeeruddinCite this: Inorg. Chem. 1992, 31, 25, 5243–5253Publica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface chemistry of magnesium oxide-supported molybdenum oxide: an in situ Raman spectroscopic studySi Chung Chang, M. Anne Leugers, and Simon R. BareCite this: J. Phys. Chem. 1992, 96, 25, 10358–10365Publication Date (Print):December 1, 1992Publication History Published on…
Abstract Currently, selection of screw configurations as well as the operating conditions for compounding polymer blends with desired morphology in a co‐rotating twinscrew extruder is an art based on experience. In this paper a quenching section of a twin‐screw extruder is described. The section may replace any segmen…
Bulk nucleation has been studied for glasses within the Y 2 O 3 –Al 2 O 3 –SiO 2 system, using a two‐stage nucleation and growth heat treatment. The crystalline phases formed have been identified. Annealing in an inert atmosphere is required in order to prevent surface nucleation from dominating the results. Despite t…
Abstract X-ray diffraction (XRD) patterns of a pore-lining diagenetic chlorite (14 Å) from a reservoir sandstone, offshore Norway, show broad odd-order and sharp even-order basal reflections indicating that it contains 7 Å layers. Using NEWMOD, simulated XRD patterns with 15% 7 Å serpentine layers and a maximum crysta…
ABSTRACT Studies of the life cycle of a centric diatom, tentatively identified as Stephanodiscus neoastraea Håkansson & Hickel, showed that sexual reproduction occurred every year in a freshwater lake (Lough Neagh, Northern Ireland). Male and female gametes were produced in cells below 55% of the maximum diameter…
We present numerical calculations of the quantum diffusion over an octagonal quasiperiodic tiling. We have studied a one-parameter family of Hamiltonians including the pure hopping case, the Laplacian, and a regime where atomic potentials prevail. We have found that unlimited diffusion occurs with anomalous exponents…
The water vapor transmission rate as a function of the physical and morphological properties of edible barriers containing methyl cellulose and fatty acids (C:14-C:22) were quantified. Barrier morphology was defined via fluorescence microscopy coupled with digitized image analysis. Stearic acid: cellulose barriers exh…
Francisco Rodriguez-Valera, José A.G. Lillo; Halobacteria as producers of polyhydroxyalkanoates, FEMS Microbiology Reviews, Volume 9, Issue 2-4, 1 December
We have studied the spreading of liquid drops on a solid surface by molecular-dynamics simulations of coexisting three-phase Lennard-Jones systems of liquid, vapor, and solid. We consider both spherically symmetric atoms and diatomic molecules, and a range of interaction strengths. As the attraction between liquid and…
In the first two papers of this series, a model, cosistent with observations, was proposed for the densification of a ceramic powder matrix in the presence of dense inclusions. One aspect of the model concerned the breakup of grain bridges linking polycrystalline clusters. This breakup phenomenon results in the format…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTopological rearrangement within a single crystal from a honeycomb cadmium cyanide [Cd(CN)2]n 3D net to a diamond netB. F. Abrahams, M. J. Hardie, B. F. Hoskins, R. Robson, and G. A. WilliamsCite this: J. Am. Chem. Soc. 1992, 114, 26, 10641–10643Publication Date (Print):Dece…
An empirical method to predict critical volume fractions for conduction in conductor-filled polymers is presented, based on the idea that a conductive composite can be thought of as a conductive skeleton with its packing geometry determined by the char acteristics of the conductive filler alone. Trends in critical vol…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFemtosecond spectroscopy of vanadyl phthalocyanines in various molecular arrangementsAkira Terasaki, Masahiro Hosoda, Tatsuo Wada, Hirokazu Tada, Atsushi Koma, Akira Yamada, Hiroyuki Sasabe, Anthony F. Garito, and Takayoshi KobayashiCite this: J. Phys. Chem. 1992, 96, 25, 10…
New discotic metallomesogens of 2,3,7,8,12,13,17,18-octakis (alkyl-thio) 5,10,15,20 tetraaza porphyrin (H2Pn) and some related complexes, obtained by reaction of first row transition metal ions Ni(II), Co(II), Cu(II), Zn(II) with the free porphyrin, have been prepared. All materials were characterized by DSC measureme…
We investigated the structure of a low-bandgap conjugated polymer, polyisothianaphthene (PITN), with a joint experimental and theoretical approach. On the one hand, C-13 NMR measurements are performed on the polymer and on a series of model isothianaphthene molecules. These molecular compounds are designed and synthes…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPara-linked aromatic poly(amic ethyl esters): precursors to rodlike aromatic polyimides. 1. Synthesis and imidization studyKevin H. Becker and Hans Werner SchmidtCite this: Macromolecules 1992, 25, 25, 6784–6790Publication Date (Print):December 1, 1992Publication History Pub…
We study the dynamics of defects generated in free-standing films of liquid crystals following a thermal quench from the smectic-A phase to the smectic-C phase. The defects are type-1 disclinations, and the strain field between defect pairs is confined to 2\ensuremath{\pi} walls. We compare our observations with a phe…
Short-chain complexed poly-beta-hydroxybutyrate, 130-170 monomer units, is a ubiquitous constituent of cells, wherein it is usually associated with other macromolecules by multiple coordinate bonds, or by hydrogen bonding and hydrophobic interactions. This conserved PHB has been isolated from the plasma membranes of b…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of novel cobalt aluminum cofacial porphyrins. First crystal and molecular structure of a heterobimetallic biphenylene pillared cofacial diporphyrinRoger Guilard, Michel Angel Lopez, Alain Tabard, Philippe Richard, Claude Lecomte, Stephane Brand…