Mingjun Jia、Werner R. Thiel2002-09-19Chemical Communications
A hybrid heterogeneous catalyst system, which has been synthesized by covalently anchoring oxodiperoxo molybdenum chelate complexes onto the surface of mesoporous MCM-41, is highly active and truly heterogeneous for the liquid-phase epoxidation of cyclooctene with tBuOOH as the oxygen source.
Mesoporous Materials and CatalysisPolyoxometalates: Synthesis and ApplicationsOxidative Organic Chemistry Reactions
Г. Е. Заиков、С. М. Ломакин2002-09-19Journal of Applied Polymer Science
Abstract The use of polymer flame retardants has an important role in saving lives. The main flame retardant systems for polymers currently in use are based on halogenated, phosphorous, nitrogen, and inorganic compounds. All of these flame retardant systems basically inhibit or even suppress the combustion process by…
Polymer Nanocomposites and PropertiesFlame retardant materials and propertiesPolymer Science and PVC
Éric Devaux、Serge Bourbigot、Ahmida El Achari2002-09-19Journal of Applied Polymer Science
Abstract Polyamide‐6 (PA‐6)/clay (modified montmorillonite) hybrid was synthesized by melt blending at high shear stress. 27 Al‐NMR of solid state shows that the clay is not modified after melt blending. Using wide‐line 1 H‐NMR and TEM, it is demonstrated that the nanocomposite exhibits mainly an exfoliated structure.…
Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesPolymer Nanocomposite Synthesis and Irradiation
Madhuri Mandal、Sujit Kumar Ghosh、Subrata Kundu 等 5 位作者2002-09-19Langmuir
Formation of stable gold nanoparticles of different size and shape has been reported via UV photoactivation of HAuCl 4 in variable concentrations of TX-100. It has been shown that smaller particles of gold preferentially dissolved by cyanide at a faster rate in air in comparison to that for the larger particles becaus…
Gold and Silver Nanoparticles Synthesis and Applicationsnanoparticles nucleation surface interactionsLaser-Ablation Synthesis of Nanoparticles
Todd Brintlinger、Yung‐Fu Chen、T. Dürkop 等 7 位作者2002-09-19Applied Physics Letters
We demonstrate the use of field-emission scanning electron microscopy for rapid imaging of small-diameter carbon nanotubes on insulating SiO2 substrates. The image contrast stems from local potential differences between the nanotube and substrate and is insensitive to surface roughness and defects. This technique may…
Carbon Nanotubes in CompositesForce Microscopy Techniques and ApplicationsMechanical and Optical Resonators
Erjuan Hao、George C. Schatz、Robert C. Johnson 等 4 位作者2002-09-19The Journal of Chemical Physics
We experimentally demonstrate for the first time the existence of distinguishable contributions to hyper-Rayleigh scattering (HRS) intensities from Ag nanoparticles arising from electric–dipole and electric–quadrupole plasmon resonances at the emitted wavelength. We show that these results can be successfully modeled…
Gold and Silver Nanoparticles Synthesis and ApplicationsPlasmonic and Surface Plasmon ResearchProtein Interaction Studies and Fluorescence Analysis
M. Acet、E. Duman、E. F. Wassermann 等 5 位作者2002-09-19Journal of Applied Physics
The structural and magnetic properties of stoichiometric Ni2MnAl are studied to clarify the conditions for ferromagnetic and antiferromagnetic ordering claimed to occur in this compound. X-ray and magnetization measurements show that although a single phase B2 structure can be stabilized at room temperature, a single…
Shape Memory Alloy TransformationsIntermetallics and Advanced Alloy PropertiesHeusler alloys: electronic and magnetic properties
Shaoguang Yang、A. B. Pakhomov、S.T. Hung 等 4 位作者2002-09-19Applied Physics Letters
Synthesis and characterization of magnetic semiconductors Al1−xCrxN, in which the atomic fraction of chromium x is up to 0.357, are reported. The films, grown by reactive co-sputtering on silicon, glass, and kapton substrates, have a crystal structure of aluminum nitride. Magnetic and transport properties were studied…
ZnO doping and propertiesMetal and Thin Film MechanicsAcoustic Wave Resonator Technologies
Gemma Ibarz、Lars Dähne、Edwin Donath 等 4 位作者2002-09-19Chemistry of Materials
The influence of thermal treatment on the permeability of polyelectrolyte multilayer capsules is studied via confocal fluorescence microscopy of individual microcapsules. For the specific most frequently used example, capsules made of poly(styrenesulfonic acid) and poly(allylamine hydrochloride), the penetration of fl…
Advanced Polymer Synthesis and CharacterizationPolymer Surface Interaction StudiesDendrimers and Hyperbranched Polymers
Michael Malkoch、Eva Malmström、Anders Hult2002-09-19Macromolecules
A divergent approach to synthesize dendritic aliphatic polyester structures based on 2,2-bis(hydroxymethyl)propionic acid (bis-MPA) is described. The key building block is the anhydride of isopropylidene-2,2-bis(methoxy)propionic acid which is synthesized in high yields through self-dehydration, utilizing N,N ‘ -dicyc…
Chemical Synthesis and AnalysisDendrimers and Hyperbranched PolymersSynthesis and properties of polymers
Jianming Zhang、Donna J. Garton、Timothy K. Minton2002-09-19The Journal of Chemical Physics
The dynamics of the initial interactions of hyperthermal O atoms with a saturated hydrocarbon surface have been investigated by directing an O-atom beam at a continuously refreshed liquid squalane surface and monitoring time-of-flight and angular distributions of inelastically scattered O atoms and reactively scattere…
Atmospheric chemistry and aerosolsCatalytic Processes in Materials ScienceSpectroscopy and Laser Applications
Fathollah Varnik、Kurt Binder2002-09-19The Journal of Chemical Physics
Using nonequilibrium molecular dynamics simulations, we compute the shear viscosity, ηs, of a glass forming polymer melt at temperatures ranging from the normal liquid state down to the supercooled state. For this purpose, the polymer melt is confined between two solid walls and a constant force pointing in direction…
Polymer crystallization and propertiesMaterial Dynamics and PropertiesRheology and Fluid Dynamics Studies
Naoto Ishikawa、Tomochika Iino、Youkoh Kaizu2002-09-19The Journal of Physical Chemistry A
Ligand-field parameters of the f-electronic systems in a series of dinuclear lanthanide phthalocyaninato complexes have been determined. To study the systems without intermetallic interactions, new asymmetric hetero-dinuclear lanthanide phthalocyaninato complexes, PcYPcLnPc* (Pc = dianion of phthalocyanine, Pc* = dian…
Magnetism in coordination complexesPorphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation Mechanisms
G. Trambly de Laissardière、D. Nguyen-Manh、D. Mayou2002-09-19arXiv
The effect on the electronic structure of an indirect Mn-Mn interaction mediated by the valence states and the sp-d hybridisation is presented. In Al(rich)-Mn phases related to quasicrystals (Al12Mn, o-Al6Mn, alpha-Al9Mn2Si), this indirect interaction creates a Hume-Rothery pseudogap in the density of states together…
cond-mat.dis-nnMaterials Science
René López、L. A. Boatner、T. E. Haynes 等 5 位作者2002-09-19Journal of Applied Physics
Vanadium dioxide single-crystal precipitates with controlled particle sizes were produced in an amorphous, fused SiO2 host by the stoichiometric coimplantation of vanadium and oxygen ions and subsequent thermal processing. The effects of the vanadium dioxide nanocrystal size, nanocrystal morphology, and particle/host…
Gas Sensing Nanomaterials and SensorsTransition Metal Oxide NanomaterialsGa2O3 and related materials
Rachel A. Caruso、Muthupandian Ashokkumar、Franz Grieser2002-09-19Langmuir
The reduction of AuCl 4 - to colloidal gold in the presence of aliphatic alcohols and sodium dodecyl sulfate in aqueous solutions using 20 kHz ultrasound is described. The extent of reduction of AuCl 4 - was found to be directly dependent on the gas−solution interfacial activity of the solutes used. The diameters of t…
Electrochemical Analysis and ApplicationsUltrasound and Cavitation PhenomenaLaser-Ablation Synthesis of Nanoparticles
Dong Hoe Kim、Jun-Won Yang、Keonuk Lee 等 11 位作者2002-09-19Applied Physics Letters
Anatase Ti0.96Co0.04O2 films were grown epitaxially on SrTiO3 (001) substrates by using pulsed laser deposition with in-situ reflection high-energy electron diffraction. The oxygen partial pressure, PO2, during the growth was systematically varied. As PO2 decreased, the growth behavior was changed from a two-dimension…
ZnO doping and propertiesMagnetic and transport properties of perovskites and related materialsCopper-based nanomaterials and applications
S. N. Taraskin、P. A. Fry、Xiadong Zhang 等 5 位作者2002-09-19arXiv
Analytical results for the asymptotic spatial decay of the density matrix $+AFw-rho({+AFw-bf r},{+AFw-bf r^+AFw-prime})$ in the tight-binding model of the two-dimensional metal are presented. In various dimensions D, it is found analytically and numerically that the density matrix decays with distance according to the…
cond-mat.dis-nnMaterials Science
Yu-Ming Lin、Oded Rabin、Stephen B. Cronin 等 5 位作者2002-09-19Applied Physics Letters
The resistivity of Bi1−xSbx nanowire arrays exhibits complex variations as a function of Sb content x and temperature T due to the unique semimetal-to-semiconductor (SM–SC) transition experienced by the nanowires. Seebeck coefficient measurements show enhanced thermopower due to Sb alloying and the reduction in wire d…
Advanced Thermoelectric Materials and DevicesThermal properties of materialsThermal Radiation and Cooling Technologies
Wontae Chang、L. C. Sengupta2002-09-19Journal of Applied Physics
The dielectric properties of Ba0.6Sr0.4TiO3 (BST) and 1.0, 20.0, 40.0, and 60.0 wt % MgO-mixed BST bulk ceramics and thin films were investigated for tunable microwave applications. The effects of MgO mixing with BST on BST phase transitions were examined. It is observed that Mg substitution into BST causes a shift in…
Ferroelectric and Piezoelectric MaterialsAcoustic Wave Resonator TechnologiesMicrowave Dielectric Ceramics Synthesis