C. S. Wang、Martin R. Bryce、Andrei S. Batsanov 等 4 位作者1997-10-01Chemistry - A European Journal
Abstract The pyrazinoporphyrazine system 13 (metal‐free, zinc and copper derivatives) has been synthesised by tetramerisation of 2,3‐dicyanopyrazine monomer unit 10 . The structure of 13a‐c has been established by 1 H NMR spectroscopy, UV/Vis spectrophotometry, MALDI‐TOF mass spectrometry, cyclic voltammetry and diffe…
Magnetism in coordination complexesPorphyrin and Phthalocyanine ChemistryOrganic and Molecular Conductors Research
Keigo Aoi、Aki Motoda、Masahiko Okada 等 4 位作者1997-10-01Macromolecular Rapid Communications
Abstract Novel linear polymer/dendrimer block copolymers, poly(2‐methyl‐2‐oxazoline)‐ block ‐poly(amido amine) dendrimers (water‐soluble full‐generation type 4 ( G = 4.0 and 5.0) and amphiphilic half‐generation type 5 ( G = 3.5, 4.5, and 5.5)), were synthesized by divergent‐growth dendrimer construction with ω‐ethylen…
Advanced Polymer Synthesis and CharacterizationSynthetic Organic Chemistry MethodsDendrimers and Hyperbranched Polymers
Andrey L. Rogach、Г. П. Шевченко、Zinaida M. Afanas'ev 等 4 位作者1997-10-01The Journal of Physical Chemistry B
The influence of the UV irradiation on the morphology and optical properties of nanosize colloidal silver particles formed in the poly(vinyl alcohol) matrix containing Ag + and formic acid was investigated. Formation of both filament and ultrafine silver particles accompanied by a strong blue shift of the silver plasm…
Gold and Silver Nanoparticles Synthesis and ApplicationsPigment Synthesis and PropertiesLaser-Ablation Synthesis of Nanoparticles
Toshiyuki Hibino、Atsumu Tsunashima1997-10-01Chemistry of Materials
Highly ordered paramolybdate (Mo 7 O 24 6 - ) intercalates of hydrotalcite-like compounds (HTlcs) were obtained through anion exchange performed on well-crystallized parent HTlcs in an ethanol/water solution. Aqueous solutions of paramolybdate are acidic, causing hydrolysis of HTlcs, but we found that an ethanol/water…
Supercapacitor Materials and FabricationLayered Double Hydroxides Synthesis and ApplicationsInorganic Chemistry and Materials
C. Dı́az-Guerra、Ángel Luís Clemente Remón、J.A. Garcı́a 等 4 位作者1997-10-01physica status solidi (a)
Cathodoluminescence (CL) and photoluminescence (PL) of nickel oxide (NiO) have been investigated. The observed emission bands in the visible and near infrared spectral ranges are attributed to Ni2+ intraionic transitions. Some of the features observed in the CL spectra recorded from vacuum annealed samples are tentati…
ZnO doping and propertiesTransition Metal Oxide NanomaterialsGa2O3 and related materials
Hayao Kobayashi、Hiroki Akutsu、E. Arai 等 5 位作者1997-10-01Physical review. B, Condensed matter
The physical properties of a series of organic superconductors with fourfold quasistacking structures, $\ensuremath{\lambda}\ensuremath{-}{\mathrm{BETS}}_{2}\mathrm{Ga}{X}_{z}{Y}_{4\ensuremath{-}z}$ [BETS=bis(ethylenedithiotetraselenafulvalene; $X,Y=\mathrm{F},$ Cl, Br; $0<z<2)]$ are changed continuously by tuni…
Perovskite Materials and ApplicationsMagnetism in coordination complexesOrganic and Molecular Conductors Research
D. Suttor、Hans‐Joachim Kleebe、Günter Ziegler1997-10-01Journal of the American Ceramic Society
Monolithic mullite with low sintering shrinkage was synthesized from polymer/filler blendsMthat is, siloxane/alumina (siloxane/Al 2 O 3 ) (and siloxane/aluminum (siloxane/Al)) mixtures. The synthesis was based on a reaction‐bonding process of amorphous silica, which formed when the siloxane was oxidized, with Al 2 O 3…
Advanced ceramic materials synthesisAdvanced materials and compositesMicrowave Dielectric Ceramics Synthesis
J. Ahmed、A.J. Wilkinson、Steve Roberts1997-10-01Philosophical Magazine Letters
Fatigue of copper single crystals, oriented for single slip, has been studied using electron channelling contrast imaging (ECCI) in a scanning electron microscope. This technique was used to detect and characterize dislocation structures in bulk specimens. With the incident beam set at the Bragg condition, changes in…
Microstructure and mechanical propertiesElectron and X-Ray Spectroscopy TechniquesIntegrated Circuits and Semiconductor Failure Analysis
Jason J. Ge、Anqiu Zhang、Kevin W. McCreight 等 8 位作者1997-10-01Macromolecules
A series of polyesters, which are comprised of aromatic main chain backbones and flexible aliphatic side chains with 4-cyanobiphenyl end groups, has been synthesized based on a polycondensation of 2,2‘-bis(trifluoromethyl)-4,4‘-biphenyldiyldicarbonyl chloride with 2,2‘-bis{ω-[(4-(4-cyanophenyl)phenoxy]- n -alkoxy)carb…
Liquid Crystal Research AdvancementsSynthesis and Properties of Aromatic CompoundsBlock Copolymer Self-Assembly
Michael Päch、Reinhard Stößer1997-10-01The Journal of Physical Chemistry A
The trapping of hydrogen atoms generated by γ-irradiation of different compounds containing the cube-shaped Si 8 O 12 -cage was investigated by means of electron spin resonance (ESR). The trapped hydrogen atoms were found to originate from the organic substituents of the cages. It was shown that intermolecular process…
Metal and Thin Film MechanicsPlasma Diagnostics and ApplicationsSilicone and Siloxane Chemistry
Michael Hon‐Wah Lam、Samuel T. C. Cheung、Ka-Man Fung 等 4 位作者1997-10-01Inorganic Chemistry
Reaction between [Ru(py-pzH)3](ClO4)2 (where py-pzH = 3-(pyridin-2-yl)pyrazole) and Cu(II) or Cu(I) in methanol, in the presence of excess NEt3, affords the triple-strand helical supramolecular {[Ru(py-pz)3]2Cu3}(ClO4). The X-ray crystal structure and 1H NMR and electronic spectroscopic properties of {[Ru(py-pz)3]2Cu3…
Organometallic Complex Synthesis and CatalysisMetal complexes synthesis and propertiesMagnetism in coordination complexes
K. W. Herwig、Zongyu Wu、Pengcheng Dai 等 5 位作者1997-10-01The Journal of Chemical Physics
Quasielastic neutron scattering experiments and molecular dynamics (MD) simulations have been used to investigate molecular diffusive motion near the melting transition of monolayers of flexible rod-shaped molecules. The experiments were conducted on butane and hexane monolayers adsorbed on an exfoliated graphite subs…
Advanced Chemical Physics StudiesMaterial Dynamics and Propertiesnanoparticles nucleation surface interactions
José A. C. Silva、Alı́rio E. Rodrigues1997-10-01AIChE Journal
Abstract Equilibrium, diffusion, and fixed‐bed adsorption of n‐hexane in pellets of 5A zeolite (Rhone‐Poulenc) were studied between 373 and 573 K and at partial pressures up to 0.2 bar. Equilibrium data were obtained in a flow microbalance system. Diffusivity was studied simultaneously by gravimetric and ZLC technique…
Zeolite Catalysis and SynthesisMesoporous Materials and CatalysisHeat and Mass Transfer in Porous Media
J. M. Gibson1997-10-01Physics Today
Cathode rays, accelerated by tens of thousands of volts or more, have had immense scientific and technological value in the hundred years since Joseph John Thomson used them to discover the electron. The most familiar use of these electron beams is in cathode-ray tubes—as used in television sets and computer displays,…
Advanced Electron Microscopy Techniques and ApplicationsAdvancements in Photolithography TechniquesElectron and X-Ray Spectroscopy Techniques
Pierre D. Harvey、M. Drouin、Tianle Zhang1997-10-01Inorganic Chemistry
The new d 10 −d 10 dimer Cu 2 (dppm) 2 (O 2 CCH 3 ) + (as a BF 4 - salt) has been prepared and characterized by X-ray crystallography and by 1 H and 31 P NMR, vibrational, and electronic spectroscopy. The compound is luminescent at 77 K but not at room temperature. MO calculations and geometry optimizations have been…
Metal complexes synthesis and propertiesMagnetism in coordination complexesLanthanide and Transition Metal Complexes
Kazuya SHINNO、Masatoshi Miyamoto、Yoshiharu Kimura 等 5 位作者1997-10-01Macromolecules
Solid-state postpolymerization of l -lactide was studied by two different ways with 0.1 mol % of stannous 2-ethyl hexanoate as the catalyst. In a two-step method, the ordinary melt polymerization of l -lactide was first performed at temperatures higher than the crystallization temperature ( T c ) of poly( l -lactide)…
biodegradable polymer synthesis and propertiesAdditive Manufacturing and 3D Printing TechnologiesCarbon dioxide utilization in catalysis
Xiaosu Yi、Guozhang Wu、Yi Pan1997-10-01Polymer International
The electrical properties of polymers filled with different types of conducting particles are reviewed. Following a theoretical description of a general effective media (GEM) equation, the experimental conductivity–volume fraction data for thermoplastic filled with vanadium oxide particles as well as thermosetting pol…
Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesPolymer Foaming and Composites
Ikuo Yanase、Hidehiko Kobayashi、Yoshio Shibasaki 等 4 位作者1997-10-01Journal of the American Ceramic Society
The tetragonal‐to‐cubic structural phase transition in pollucite (CsAlSi 2 O 6 ) was investigated using low‐temperature X‐ray powder diffraction in the temperature range of 93 to 298 K, and the lattice constants were refined with Rietveld analysis. It was found that CsAlSi 2 O 6 had a tetragonal phase with a space gro…
Glass properties and applicationsClay minerals and soil interactionsX-ray Diffraction in Crystallography
F.H. Stott1997-10-01Materials science forum
La croissance et le developpement des couches protectrices d'alumine sur des alliages NiAl et FeCrAl au cours de l'oxydation a 900°C et a 1300°C sont complexes du fait de la transformation de l'alumine metastable―y-Al 2 O 3 et―θ-Al 2 O 3 , en une phase,―α, plus stable. Comme les vitesses de transformation augmentent a…
Advanced ceramic materials synthesisCatalytic Processes in Materials ScienceHigh-Temperature Coating Behaviors
Alexander V. Tikhonravov、Michael K. Trubetskov、Brian Sullivan 等 4 位作者1997-10-01Applied Optics
It is well known that the spectral transmittance and reflectance of a thin film can be influenced by even small inhomogeneities or variations in its complex refractive-index profile. Formulas are derived that describe the theoretical variation of the spectral characteristics for small changes in the refractive index a…
Color Science and ApplicationsOptical Coatings and GratingsSurface Roughness and Optical Measurements