Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanisms of photodegradation of poly(3-alkylthiophenes) in solutionMohamed S. A. Abdou and Steven HoldcroftCite this: Macromolecules 1993, 26, 11, 2954–2962Publication Date (Print):May 1, 1993Publication History Published online1 May 2002Published inissue 1 May 1993https:/…
Abstract The state of thermodynamic miscibility of a polymer blend and its resulting phase behavior and mechanical properties is largely determined by the balance between enthalpic and entropic contributions to the free energy of mixing. Recent applications of this thermodynamic consideration are reviewed for a variet…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlignment of lamellar block copolymer microstructure in an electric field. 1. Alignment kineticsKarl Amundson, Eugene Helfand, Xina Quan, and Steven D. SmithCite this: Macromolecules 1993, 26, 11, 2698–2703Publication Date (Print):May 1, 1993Publication History Published onl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic activity and structural analysis of polymer-protected gold/palladium bimetallic clusters prepared by the successive reduction of hydrogen tetrachloroaurate(III) and palladium dichlorideMasafumi Harada, Kiyotaka Asakura, and Naoki ToshimaCite this: J. Phys. Chem. 19…
A correlation exists between the width of the glass transition region measured using DTA or DSC during heating and the activation enthalpy Δ H η * for the shear viscosity of high‐Tginorganic glasses. This is demonstrated by the constancy of a dimensionless parameter C = (Δ H η * / R )(1/Tg – 1/Tg′), where Tg and Tg′ a…
This paper presents results of pseudopotential Hartree-Fock calculations on the titanium dioxide crystals. The optimized structures are in good agreement with experimental data. Both anatase and rutile structures have a large ionic character. The distortions from the undistorted crystals made of regular octahedra are…
Indium tin oxide (ITO) films deposited on single-crystal Si wafers by the electron-beam-(EB) evaporation method have been investigated by x-ray photoelectron spectroscopy (XPS) together with work-function and resistivity measurements. The XPS studies suggest that all the ITO films consist of crystalline and amorphous…
Conference Article| May 01 1993 Mechanism for the formation of methylglyoxal from triosephosphates J. P. Richard J. P. Richard 1Department of Chemistry, University of Kentucky, Lexington, KY 40506–0055, U.S.A. Search for other works by this author on: This Site PubMed Google Scholar Biochem Soc Trans (1993) 21 (2): 54…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAbsolute hardness: unifying concept for identifying shells and subshells in nuclei, atoms, molecules, and metallic clustersRobert G. Parr and Zhongxiang ZhouCite this: Acc. Chem. Res. 1993, 26, 5, 256–258Publication Date (Print):May 1, 1993Publication History Published onlin…
Abstract SBR compounds were filled with 17 carbon blacks covering the whole range of rubber grades and tested for bound-rubber content. It was found that the bound-rubber content of a polymer at high loadings is higher for large surface-area carbon blacks. On the other hand, the bound-rubber content per unit of interf…
Phase recovery from unphased data is the central problem in the interpretation of crystal diffraction data. There are a number of experimental methods for determining phases, and for small molecules computational methods work very well. The problem of developing robust computational methods for large molecules is not…
Molecules and assemblies therefrom with strictly vanishing multipolar-like tensorial susceptibilities of given orders are defined in general, following group theoretical prescriptions. This approach leads, in the case of quadratic nonlinear optical properties, to a new class of molecules with strictly vanishing dipole…
Abstract It is shown that poly(3‐alkylthiophene)s may readily crystallize from poor solvents in the form of whiskers. The experimental conditions required for the formation of whiskers were found to depend upon the alkyl side‐chain length, solvent quality, and temperature. In all cases studied for alkyl side‐chain len…
. The crystal structure of a ternary complex containing the catalytic subunit of cAMP-dependent protein kinase, ATP and a 20-residue inhibitor peptide was refined at a resolution of 2.2 A to an R value of 0.177. In order to identify the metal binding sites, the crystals, originally grown in the presence of low concent…
A complete description of the first‐order Raman and Brillouin spectra of single‐crystal aluminum nitride is provided. The frequency has been measured and the symmetry identified of each of the Raman‐active zone‐center optic modes, and the five independent elastic constants have been measured. The widths of the princip…
We have previously described a novel monocrystalline iron oxide nanocompound (MION), a stable colloid that enables target specific MR imaging. In this study, the physicochemical properties of MION are reported using a variety of analytical techniques. High resolution electron microscopy indicates that a MION consists…
Abstract The current status of organic low‐molecular weight and polymeric materials for third‐order nonlinear optics is reviewed. The importance of organic materials lies in their promise of large nonlinear optical figure of merit, high optical damage thresholds, ultrafast optical responses, architectural flexibility,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical aspects of solution routes to perovskite-phase mixed-metal oxides from metal-organic precursorsClive D. Chandler, Christophe. Roger, and Mark J. Hampden-SmithCite this: Chem. Rev. 1993, 93, 3, 1205–1241Publication Date (Print):May 1, 1993Publication History Publishe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNarrow molecular weight resins by a free-radical polymerization processMichael K. Georges, Richard P. N. Veregin, Peter M. Kazmaier, and Gordon K. HamerCite this: Macromolecules 1993, 26, 11, 2987–2988Publication Date (Print):May 1, 1993Publication History Published online1…
Data on the synthesis, structures and properties of ionic, coordination, organometallic and organoelement compounds with liquid-crystal properties are surveyed. The substances examined are new in the chemistry of the liquid-crystal compounds. Their potential applications are described. The bibliography includes 211 re…