Yong Son、Krishnan Rajeshwar1992-01-01Journal of the Chemical Society Faraday Transactions
For non-degenerate ground-state polymers such as polypyrrole, it has been shown by other authors that radical cations (polarons) and dications (bipolarons) are the species responsible for their electronic conduction. The evolution of these species with electrode potential and doping level has also been considered in p…
Conducting polymers and applicationsElectrochemical Analysis and ApplicationsAnalytical Chemistry and Sensors
B. M. AVELINE、Olavio Delgado、Daniel Brault1992-01-01Journal of the Chemical Society Faraday Transactions
The reactivity of several vinyl porphyrins towards singlet oxygen (1O2) in various solvents has been investigated using time-resolved detection of infrared luminescence at 1270 nm. The porphyrins studied are derived from deuterioporphyrin through 2- or 4-substitution. The singlet-oxygen quenching constant, kp, is foun…
Porphyrin and Phthalocyanine ChemistryPhotodynamic Therapy Research StudiesPhotochemistry and Electron Transfer Studies
V. Serin、G. Zanchi、J. Sévely1992-01-01Microscopy Microanalysis Microstructures
2014 Des tudes de pertes d'nergie d'lectrons effectues en microscopie lectronique moyenne et haute tension nous ont permis de mettre en vidence les modulations EXELFS sur les dis- tributions associes aux excitations du niveau atomique K des lments de faibles numros atomiques (Z ~ 16). Ces modulations constituent une s…
Atomic and Molecular PhysicsX-ray Spectroscopy and Fluorescence AnalysisElectron and X-Ray Spectroscopy Techniques
Yutaka Kawabe、H. Ikeda、Toshio Sakai 等 4 位作者1992-01-01Journal of Materials Chemistry
Both real and imaginary parts of the second-order non-linear optical coefficients for a wide range of new organic conjugated materials have been measured. The technique of electric-field-induced second-harmonic generation to determine the optical non-linearity is described for materials highly absorptive at the harmon…
Nonlinear Optical Materials ResearchPhase-change materials and chalcogenidesNonlinear Optical Materials Studies
Chi K. Chang、Weishih Wu、Shuenn‐Shing Chern 等 4 位作者1992-01-01Angewandte Chemie International Edition in English
A tetraazamacrocycle from three pyrrole units and a condensed furan ring—“furochloro-phin”—surrounds the NiII ion in 1. This 18π electron system with a basic chlorin structure is formed surprisingly easily from the thermolysis of (octadehydrocorrinato)nickel(II) chloride. This synthesis will probably not only provide…
Porphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation MechanismsPorphyrin Metabolism and Disorders
José A. Rodríguez、Charles M. Truong、Jason S. Corneille 等 4 位作者1992-01-01The Journal of Physical Chemistry
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular precursors to boron nitride thin films. 1. Adsorption of diborane on ruthenium(0001), ammonia/ruthenium(0001), and oxygen/ruthenium(0001) surfacesJose A. Rodriguez, Charles M. Truong, Jason S. Corneille, and D. Wayne GoodmanCite this: J. Phys. Chem. 1992, 96, 1, 33…
Metal and Thin Film MechanicsBoron and Carbon Nanomaterials ResearchMXene and MAX Phase Materials
J. Gähde、Jörg F. Friedrich、Rolf Gehrke 等 5 位作者1992-01-01Journal of Adhesion Science and Technology
A number of procedures for cleaning the surface of steel have been tested. By washing with different solvents, ultrasonic solvent cleaning, sand-blasting or grinding, and desorption of organic contamination in an oxygen plasma, the degree of cleaning increased successively, as detected by XPS. The adhesion of polyuret…
Asphalt Pavement Performance EvaluationMaterial Properties and ApplicationsPolymer Science and Applications
Masaki Matsui、Shigeo Kawamura、Katsuyoshi Shibata 等 4 位作者1992-01-01Bulletin of the Chemical Society of Japan
Abstract A series of mono-, bis-, and trissubstituted pyridinium and pyrylium dyes have been synthesized by the condensation of methylpyridinium and methylpyrylium salts with aldehydes or nitroso compound. Large bathochromic shifts were observed in the following order, both in substituted azomethine pyridinium and pyr…
Porphyrin and Phthalocyanine ChemistryPhotochemistry and Electron Transfer StudiesSynthesis of Organic Compounds
Jan Blomquist、Håkan Lång、Ragnar Larsson 等 4 位作者1992-01-01Journal of the Chemical Society Faraday Transactions
FeIII tetraphenylporphyrin chloride (FeCITPP) has been pyrolysed at different temperatures (450–850 °C) for different lengths of time (10–260 min). Some of the samples were mixed with carbon black in a 50/50 (w/w) proportion. Mössbauer spectra were obtained for these catalyst powders. The spectra reveal a number of di…
Photosynthetic Processes and MechanismsPorphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation Mechanisms
Stuart Thomas Jackson、Robert D. Short1992-01-01Journal of Materials Chemistry
Imaging static secondary-ion mass spectroscopy (SIMS) has been used to investigate the surface morphology of PVC/PMMA blends cast from tetrahydrofuran. The established morphology of the bulk was found to extend to the surface.
Advanced Polymer Synthesis and CharacterizationPolymer Nanocomposite Synthesis and IrradiationPolymer Science and PVC
Sofie Bedford、Kai-Ling Yu、Alan H. Windle1992-01-01Journal of the Chemical Society Faraday Transactions
Molecular modelling procedures have been used to determine statistical parameters of isolated chains, with the objective of achieving a simple description which defines the tendency of a molecule to form a liquid-crystalline phase, its mesogenicity. Initial attention is focused on the persistence length parameter as t…
Liquid Crystal Research AdvancementsPolymer crystallization and propertiesMaterial Dynamics and Properties
S. N. Maiti、U. K. Saroop、Ashok Misra1992-01-01Polymer Engineering and Science
Abstract Blends of poly (vinyl chloride) (PVC) and acrylonitrile‐butadiene styrene (ABS) terpolymer were prepared in different ratios by a melt blending technique. ABS containing three different levels of rubber content were used. A quantitative assessment of ABS in PVC/ABS blends has been shown by infrared studies. A…
Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesPolymer Science and PVC
Michael J. Ward、Eric F. Van de Velde1992-01-01IMA Journal of Applied Mathematics
The conditions for the onset of thermal runaway in partially insulated or cooled reactors are investigated. The temperature in the reactor is taken to satisfy a nonlinear elliptic equation and the reaction is modelled by an Arrhenius heat generation term with finite activation energy. To determine the onset of thermal…
Drilling and Well EngineeringIron and Steelmaking ProcessesGraphite, nuclear technology, radiation studies
J. Ambroise、S Martin-Calle、J. Péra1992-01-01OpenAlex
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Concrete and Cement Materials ResearchClay minerals and soil interactions
Eugene Helfand1992-01-01Macromolecules
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiffusion in strongly segregated block copolymersEugene HelfandCite this: Macromolecules 1992, 25, 1, 492–493Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 January 1992https://pubs.acs.org/doi/10.1021/ma00027a078http…
Theoretical and Computational PhysicsBlock Copolymer Self-AssemblyAdvanced Mathematical Modeling in Engineering
David J. Oostendorp、Gary L. Bertrand、James O. Stoffer1992-01-01Journal of Adhesion Science and Technology
As part of our work with the use of silane coupling agents, we have been investigating the transformations of alkoxysilancs into siloxanes. The influence of a para-substituted phenyl group attached to the silicon was investigated and the rates of acid catalyzed hydrolysis and alcoholysis of these para-substituted phen…
Mesoporous Materials and CatalysisSynthesis and properties of polymersSilicone and Siloxane Chemistry
Shigeru Suzuki、K. Kuroki、Hitome Kobayashi 等 4 位作者1992-01-01Materials Transactions JIM
Grain boundary segregation in Fe-3 mass%Si alloys doped with tin was investigated by Auger electron spectroscopy (AES), in order to shed light on a fact that tin addition modifies secondary recrystallization of Si steels. It was found that in decarburized specimens tin was segregated at grain boundaries and its segreg…
Microstructure and Mechanical Properties of SteelsAluminum Alloy Microstructure PropertiesMagnetic Properties and Applications
A. Cassol、Plinio Dí Bernardo、Roberto Portanova 等 6 位作者1992-01-01Journal of the Chemical Society Dalton Transactions
The thermodynamics of complex formation of lanthanide(III) ions with the neutral nitrogen-donor ligand ethylenediamine has been studied in the anhydrous aprotic solvent dimethyl sulfoxide at 25 °C and in an ionic medium, 0.1 mol dm–3 NEt4ClO4. The stability constants of the complexes and hence the free-energy changes…
Analytical chemistry methods developmentRadioactive element chemistry and processingLanthanide and Transition Metal Complexes
Vivekanand Kain、S. S. Chouthai、H.S. Gadiyar1992-01-01British Corrosion Journal
Stainless steel AISI 304L, because of its satisfactory corrosion resistance, is widely used as a construction material for nitric acid service, particularly for nuclear fuel reprocessing plants. However, the presence of active inclusions (observed as end grain pitting II) makes the material susceptible to attack in ni…
Corrosion Behavior and InhibitionHydrogen embrittlement and corrosion behaviors in metalsNon-Destructive Testing Techniques
Masaki Shimizu、Osamu Shitamura、Shūsuke MATSUO 等 5 位作者1992-01-01ISIJ International
Recently work rolls for cold rolling mill have been required for higher toughness because of remarkable progress in rolling mill, in addition, demands for higher wear resistance of rolls and lower damage of rolls in the accident of rolling have been increasing more and more. The new composite roll by the rotational el…
Microstructure and Mechanical Properties of SteelsMetallurgy and Material FormingMetal Alloys Wear and Properties