Steven G. Fiddy、Mark A. Newton、Tom Campbell 等 8 位作者2002-01-31Physical Chemistry Chemical Physics
In situ, time resolved energy dispersive EXAFS (EDE) has been used in conjunction with temperature programmed reduction/decomposition (TPR/TPD), transmission electron microscopy (TEM), powder X-ray diffraction (PXRD), and diffuse reflectance infrared spectroscopy (DRIFTS) to probe the evolution and character of Pt and…
Catalytic Processes in Materials ScienceMesoporous Materials and CatalysisCatalysis and Oxidation Reactions
Céline Carbonneau、Richard Frantz、Jean‐Olivier Durand 等 6 位作者2002-01-31Journal of Materials Chemistry
The mild cleavage of phosphonodiester groups supported on a silica matrix has been investigated. The use of TMSBr (bromotrimethylsilane) with diethyl phosphonates has been revisited, and interactions of phosphonoacids with silicon species are described. An alternative route utilising di-tert-butyl phosphonate group ha…
Molecular Sensors and Ion DetectionChemical Synthesis and AnalysisLuminescence and Fluorescent Materials
M. H. Yükselici2002-01-31Journal of Physics Condensed Matter
The growth of CdS 0.08 Se 0.92 nanoparticles in glass is studied through the analysis of optical absorption spectra with the help of a quantized-state effective-mass model in which the conduction band effective mass is particle size dependent. The glass includes nanoparticles with an initial average size of ~1.4 nm on…
Quantum Dots Synthesis And PropertiesChalcogenide Semiconductor Thin FilmsCopper-based nanomaterials and applications
Sonia Amigoni、Sylvain Désert、Thadée Gulik-Kryswicki 等 4 位作者2002-01-31Macromolecules
Stable translucent aqueous suspensions of ligand-functionalized nanoparticles, with average diameters ranging from 12 to 20 nm and containing from 0.25 to up to 0.75 mmol of ligand/g, are readily obtained by copolymerization in oil-in-water microemulsions of a polymerizable tetraaza macrocycle, vinylbenzylcyclam (cycl…
Advanced Polymer Synthesis and CharacterizationRNA Interference and Gene DeliveryDendrimers and Hyperbranched Polymers
Cristina Pozo‐Gonzalo、T. Khan、Joseph J. W. McDouall 等 11 位作者2002-01-31Journal of Materials Chemistry
A new series of regioregular poly(terthiophenes), bearing bis(thioether) side groups, has been prepared by electrochemical oxidation. Cyclic voltammetry of the parent trimers reveals an increase in electron donating ability in cyclic thioether derivatives. For example, one compound containing a central ethylenedithiot…
Organic Electronics and PhotovoltaicsConducting polymers and applicationsOrganic and Molecular Conductors Research
Andrew J. Archer、Robert Evans2002-01-31Journal of Physics Condensed Matter
Using a simple mean-field density functional approach we investigate the adsorption of a binary fluid mixture of repulsive Gaussian core particles at a repulsive planar wall. For certain choices of wall-fluid potential we find a first-order wetting transition, and the accompanying pre-wetting line, whereby the fluid p…
Phase Equilibria and ThermodynamicsMaterial Dynamics and PropertiesElectrostatics and Colloid Interactions
Guang Yang、Yan Zhang、E. T. Kang 等 6 位作者2002-01-31Journal of Materials Chemistry
Fluoropolymer films were deposited on pristine and N2 plasma-pretreated copper foil surfaces by plasma polymerization of allylpentafluorobenzene (APFB) under different glow discharge conditions and using argon as the carrier gas. The effect of the radio-frequency (RF) plasma power on the surface composition and chemic…
Surface Modification and SuperhydrophobicityMetal and Thin Film MechanicsPlasma Diagnostics and Applications
Bong-Jin Jeon、Soon Wook、Mi‐Yun Jeong 等 5 位作者2002-01-31Journal of Materials Chemistry
An organic soluble polyimide was prepared from 3,3′-dihydroxybenzidine and 2,2-bis(phthalic anhydride)hexafluoropropane. The two hydroxy groups in the repeating unit of the polyimide thus prepared were utilized in attaching 4-nitro-4′-diphenylaminoazobenzene chromophores onto the main chain perpendicularly (or in an e…
Nonlinear Optical Materials ResearchPhotorefractive and Nonlinear OpticsSynthesis and properties of polymers
Lü Shaojie、Ruixian Liu、Ximing Sun2002-01-31Journal of Applied Polymer Science
Abstract A series of amphoteric polyacrylamides with different molecular weights and charges were prepared by the copolymerization of acrylamide with sodium acrylate and a subsequent Mannich reaction. The copolymerization was carried out with a redox initiation system via inverse emulsion polymerization. Reaction cond…
Advanced Polymer Synthesis and CharacterizationAdvanced Cellulose Research Studies
Yu‐Qing Zhang、Zhiqiang Fan、Linxian Feng2002-01-31Journal of Applied Polymer Science
Abstract A spherical TiCl 4 /MgCl 2 ‐based catalyst was used in the synthesis of in situ isotactic polypropylene/ethylene–propylene random copolymer blends by propylene bulk polymerization and subsequent gas‐phase copolymerization of ethylene with propylene. Different copolymerization conditions, such as the reaction…
Polymer crystallization and propertiesPolymer Nanocomposites and Propertiesbiodegradable polymer synthesis and properties
Kostya Trachenko、Martin T. Dove2002-01-31Journal of Physics Condensed Matter
We study the effects of pressure on the existence of floppy modes in silica glass. We find that small values of pressure do not alter the ability of silica glass to sustain floppy modes, as long as they are not accompanied by changes in the topology of the glass, and thus do not change the balance between the number o…
Glass properties and applicationsPhotonic Crystals and ApplicationsPhase-change materials and chalcogenides
Heather Kalish、J. E. Camp、Marcin Stępień 等 6 位作者2002-01-31Inorganic Chemistry
Introduction of a single meso substituent into ClFe(III)(OEP) or K[(NC)(2)Fe(OEP)] results in significant changes in the geometric and/or spectroscopic properties of these complexes. The mono-meso-substituted iron(III) complexes ClFe(III)(meso-Ph-OEP), ClFe(III)(meso-n-Bu-OEP), ClFe(III)(meso-MeO-OEP), ClFe(III)(meso-…
Porphyrin and Phthalocyanine ChemistryHeme Oxygenase-1 and Carbon MonoxidePorphyrin Metabolism and Disorders
B. Raveau、C. Martin、A. Maignan 等 4 位作者2002-01-31Journal of Physics Condensed Matter
The air-synthesized La 1- x Ba x MnO 3 system was revisited for 0.4⩽ x ⩽0.9. We show that this system exhibits an insulator-metal like transition, T IM (175-230 K), far below the Curie temperature ( T C ≈335 K). In contrast to previous studies, we demonstrate that this system is multiphase, i.e. involving a hexagonal…
Magnetic and transport properties of perovskites and related materialsMultiferroics and related materialsAdvanced Condensed Matter Physics
Manabu Ishimaru、Yoshihiko Hirotsu、I.V. Afanasyev-Charkin 等 4 位作者2002-01-31Journal of Physics Condensed Matter
Ion-beam-induced microstructures in magnesium aluminate (MgAl 2 O 4 ) spinel have been examined using transmission electron microscopy (TEM). Irradiations were performed at cryogenic temperature (~120 K) on MgAl 2 O 4 spinel single-crystal surfaces with (111) orientation, using 180 keV neon (Ne + ) ions to ion fluence…
Glass properties and applicationsIon-surface interactions and analysisNuclear materials and radiation effects
Yuqin Li、Hatsuo Ishida2002-01-31Chemistry of Materials
The intercalation process of hexadecylamine into bentonite and the fine structure of hexadecylamine in nanoscale confined space are studied by differential scanning calorimetry and X-ray diffraction. Intercalated amine exhibits multiple melting temperatures that are approximately 30 °C higher than the bulk amine, prov…
Polymer Nanocomposites and PropertiesMesoporous Materials and CatalysisClay minerals and soil interactions
Seungwu Han、M. H. Lee、Jisoon Ihm2002-01-31Physical review. B, Condensed matter
An efficient computational scheme based on the first-principles pseudopotential method is proposed for the electron emission from nanostructures under an applied electric field. The emission rate of the electron through the potential barrier is calculated by integrating the time-dependent Schr\"odinger equation for th…
Carbon Nanotubes in CompositesGraphene research and applicationsMechanical and Optical Resonators
Tolga Çamlı、Mürvet Tuncel、Serap Şenel 等 4 位作者2002-01-31Journal of Applied Polymer Science
Abstract A series of uniform, macroporous particles with different surface chemistries were prepared with different acrylic comonomers [methyl methacrylate (MMA), butyl methacrylate (BMA), epoxypropyl methacrylate (EPMA), 2‐hydroxyethyl methacrylate (HEMA), and methacrylic acid (MAA)] with styrene–divinylbenzene (S–DV…
Advanced Polymer Synthesis and CharacterizationPolymer Surface Interaction StudiesPickering emulsions and particle stabilization
Amyl Ghanem、Denise Skonberg2002-01-31Journal of Applied Polymer Science
Abstract Model bioactive compounds with different molecular and functional characteristics were entrapped in gel beads prepared by polyelectrolyte complexation of chitosan and pentasodium tripolyphosphate (TPP). Three compounds of interest to the food and biomedical industries were tested: (1) lysine, (2) bovine serum…
biodegradable polymer synthesis and propertiesPolymer Surface Interaction StudiesAdvanced Drug Delivery Systems
Sheng‐Wu Zhu、Wen‐Fang Shi2002-01-31Polymer International
Abstract A series of hyperbranched polyurethane acrylates containing phosphorus were prepared by reaction of a phosphorus‐containing triol with toluene‐2,4‐diisocyanate and hydroxylethyl acrylate at given ratios. The resins obtained were found to polymerize rapidly in the presence of a photofragmenting initiator under…
Flame retardant materials and propertiesDendrimers and Hyperbranched PolymersSynthesis and properties of polymers
Kathryn E. Splan、Melinda H. Keefe、Aaron M. Massari 等 5 位作者2002-01-31Inorganic Chemistry
The reaction of pyridyl functionalized porphyrins with Re(CO)(5)Cl in THF results in the formation of porphyrin dimers which, despite incorporation of rhenium into the assemblies, remain fluorescent. The rigid compounds provide an efficient geometry and/or orbital pathway for singlet energy transfer, rendering these c…
Photosynthetic Processes and MechanismsPorphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation Mechanisms