Hanspeter Andres、J.M. Clemente-Juan、Michael Aebersold 等 9 位作者1999-10-16Journal of the American Chemical Society
The ground-state properties of the tetranuclear Co 2+ cluster [Co 4 (H 2 O) 2 (PW 9 O 34 ) 2 ] 10 - were investigated by combining specific heat, magnetic susceptibility, and magnetization measurements with a detailed inelastic neutron scattering (INS) study on a fully deuterated sample of K 10 [Co 4 (H 2 O) 2 (PW 9 O…
Magnetism in coordination complexesPolyoxometalates: Synthesis and ApplicationsNanocluster Synthesis and Applications
Yitzhak Mastai、Ronen Polsky、Yu. Koltypin 等 5 位作者1999-10-16Journal of the American Chemical Society
Powders of CdSe nanoparticles were prepared by a pulsed sonoelectrochemical technique. The crystal size could be varied from X-ray amorphous up to 9 nm (sphalerite phase) by controlling the various electrodeposition and sonic parameters. The mechanisms for the effects of the various parameters on particle size are dis…
Advanced Photocatalysis TechniquesQuantum Dots Synthesis And PropertiesChalcogenide Semiconductor Thin Films
Rebecca B. Hoyle、Anita Mehta1999-10-16arXiv
We formulate a continuum model for aeolian sand ripples consisting of two species of grains: a lower layer of relatively immobile clusters, with an upper layer of highly mobile grains moving on top. We predict analytically the ripple wavelength, initial ripple growth rate and threshold saltation flux for ripple format…
Materials Science
Paul Langan、Yoshiharu Nishiyama、H. Chanzy1999-10-16OpenAlex
The crystal and molecular structure and hydrogen bonding system in cellulose II have been revised using new neutron diffraction data extending to 1.2 Å resolution collected from two highly crystalline fiber samples of mercerized flax. Mercerization was achieved in NaOH/H 2 O for one sample and in NaOD/D 2 O for the ot…
Advanced Cellulose Research StudiesLignin and Wood ChemistryCultural Heritage Materials Analysis
Kamal Saeed、Folahan O. Ayorinde、Broderick E. Eribo 等 5 位作者1999-10-15Rapid Communications in Mass Spectrometry
Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOFMS) was used for the characterization of a partially transesterified poly(beta-hydroxyalkanoate), PHA, polymer produced by the bacterial strain Alcaligenes eutrophus using saponified vegetable oils as the sole carbon sources. The tr…
Polymer crystallization and propertiesbiodegradable polymer synthesis and propertiesMicroplastics and Plastic Pollution
Lin‐Yue Lanry Yung、Robert W. Colman、Stuart L. Cooper1999-10-15Blood
Interaction of biomaterials with blood components including neutrophils is responsible for some of the clinical complications that have occurred in cardiopulmonary bypass, hemodialysis, and ventricular assist procedures. The possibility of inhibiting the initial adhesion of neutrophils to biomaterials has been studied…
Membrane Separation TechnologiesMechanical Circulatory Support DevicesPolymer Surface Interaction Studies
Daniel R. Lewis、Richard Cole、P. Weightman1999-10-15Journal of Physics Condensed Matter
The distribution of site potentials in CuZn alloys is investigated using x-ray-excited photoelectron spectroscopy. A small `disorder broadening' of the core-level photoelectron spectra is observed for the alloys. Experimental results are compared with results of model and first-principles calculations.
Advanced Chemical Physics StudiesX-ray Spectroscopy and Fluorescence AnalysisElectron and X-Ray Spectroscopy Techniques
You-Hua Luo、Jijun Zhao、Guanghou Wang1999-10-15Physical review. B, Condensed matter
${\mathrm{Si}}_{6}$ and ${\mathrm{Si}}_{7}$ are the two largest clusters with confirmed geometries experimentally. The apex atoms in the pentagonal bipyramidal structure for ${\mathrm{Si}}_{7}$ have a coordination number of 6, completely different from the tetrahedral structure of the diamond lattice, and never given…
Advanced Chemical Physics StudiesHigh-pressure geophysics and materialsBoron and Carbon Nanomaterials Research
Somnath Bhattacharyya、A. Granier、G. Turban1999-10-15Journal of Applied Physics
Amorphous nitrogenated carbon films are prepared in a dual electron cyclotron resonance-radio frequency plasma from a mixture of methane and nitrogen gas. A marked variation of electronic properties and microstructure of the films as a function of nitrogen concentration is observed from Fourier transform infrared (FTI…
ZnO doping and propertiesMetal and Thin Film MechanicsDiamond and Carbon-based Materials Research
P. K. de Boer、R. A. de Groot1999-10-15Physical review. B, Condensed matter
Ab initio electronic structure calculations, based on density-functional theory within the generalized gradient approximation, on ${\mathrm{LaSr}}_{2}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$ are reported. The bulk electronic structure shows a gap in the minority-spin channel, while the Fermi energy lies at the bottom of the…
Magnetic and transport properties of perovskites and related materialsAdvanced Condensed Matter PhysicsElectronic and Structural Properties of Oxides
A. W. Broerman、David C. Venerus、Jay D. Schieber1999-10-15The Journal of Chemical Physics
Anisotropic thermal diffusivity is examined in a cross-linked silicone elastomer deformed in simple elongation. Thermal diffusivity both parallel and perpendicular to the stretch direction is measured using an optical technique called forced Rayleigh scattering. The thermal diffusivity is found to increase linearly wi…
Mechanical Behavior of CompositesThermal properties of materialsAdhesion, Friction, and Surface Interactions
Rolf W. Winter、Paul G. Nixon、Gary L. Gard 等 7 位作者1999-10-15Chemistry of Materials
Acrylate monomers bearing side chains terminated in sulfur pentafluoride (−SF 5 ) groups have been synthesized. These monomers have been copolymerized into films with the conventional aliphatic acrylic monomer 2-hydroxyethyl methacrylate (HEMA) using neat cast mixed monomer films and photoinitiation. Depth-dependent s…
Surface Modification and SuperhydrophobicityAdvancements in Photolithography TechniquesElectron and X-Ray Spectroscopy Techniques
Ross H. McKenzie、Perez Moses1999-10-15Physical review. B, Condensed matter
The frequency dependence of the interlayer conductivity of a layered Fermi liquid in a magnetic field that is tilted away from the normal to the layers is considered. For both quasi-one- and quasi-two-dimensional systems resonances occur when the frequency is a harmonic of the frequency at which the magnetic field cau…
Quantum and electron transport phenomenaRare-earth and actinide compoundsOrganic and Molecular Conductors Research
Mitsuhiro Okumoto、Yoshiko Tasaka、Yo Nakamura 等 4 位作者1999-10-15Macromolecules
Anionically polymerized six-arm star polystyrene samples with weight-average molecular weights M w of 5.6 × 10 4 −3.2 × 10 6 were studied by light scattering and viscometry in cyclohexane at different temperatures to determine their z -average mean-square radii of gyration (〈 S 2 〉 z ), second and third virial coeffic…
Polymer crystallization and propertiesMaterial Dynamics and PropertiesPolymer Nanocomposites and Properties
Fabrizio Giorgis、Candido Fabrizio Pirri、Claudio Vinegoni 等 4 位作者1999-10-15Physical review. B, Condensed matter
Radiative recombinations in amorphous ${\mathrm{Si}}_{1\ensuremath{-}x}{\mathrm{N}}_{x}:\mathrm{H}$-based nanometric multilayer structures have been studied by stationary and time-resolved photoluminescence measurements at room temperature. Such structures show higher photoluminescence efficiency than reference bulk a…
Semiconductor materials and devicesThin-Film Transistor TechnologiesSilicon Nanostructures and Photoluminescence
Chunling Li、Zhenghao Chen、Dafu Cui 等 8 位作者1999-10-15Journal of Applied Physics
Ferroelectric BaTiO3 thin films have been fabricated on SrTiO3(001) substrate using pulsed laser deposition. In order to investigate the phase transition behavior of the thin films, we have conducted high-temperature x-ray diffraction in the process of heating and cooling. Lattice constants, degree of c-axis orientati…
Ferroelectric and Piezoelectric MaterialsAcoustic Wave Resonator TechnologiesElectronic and Structural Properties of Oxides
Suh Joon Han、David J. Lohse、P. D. Condo 等 4 位作者1999-10-15Journal of Polymer Science Part B Polymer Physics
The pressure–volume–temperature (P–V–T) properties of a number of metallocene-produced polyolefins were measured experimentally at 10 MPa ≤ P ≤ 200 MPa and 30°C ≤ T ≤ 220°C in a dilatometer-type P–V–T apparatus. These included ethylene copolymers typical of linear low density polyethylene, with several α-olefins as co…
Polymer crystallization and propertiesPolymer Foaming and CompositesPolymer Science and PVC
Todd Emrick、Wayne Hayes、Jean M. J. Fr�chet1999-10-15Journal of Polymer Science Part A Polymer Chemistry
Dumbbell-shaped ABA triblock copolymers composed of benzyl ether dendrons and polystyrene as the A and B blocks, respectively, were prepared using 2,2,6,6-tetramethylpiperidinyl-1-oxy (TEMPO) -mediated “living” free-radical polymerization. A new bis-dendritic unimolecular initiator, compound 3, was employed to study t…
Advanced Polymer Synthesis and CharacterizationDendrimers and Hyperbranched PolymersSynthesis and properties of polymers
L. Grigorian、Gamini Sumanasekera、A. L. Loper 等 6 位作者1999-10-15Physical review. B, Condensed matter
The electrical transport properties of single-wall carbon nanotubes are shown to be strongly influenced by the presence of transition-metal impurities derived from the catalyst introduced to stimulate their growth. Data on thermoelectric power and electrical resistance in the temperature range 10--400 K were obtained…
Carbon Nanotubes in CompositesGraphene research and applicationsThermal properties of materials
Ralf Terborg、J. Hoeft、M. Polčík 等 11 位作者1999-10-15Physical review. B, Condensed matter
The local structure around adsorbed carbon atoms on Ni(100) has been determined at low coverage as well as in the 0.5 monolayer $(2\ifmmode\times\else\texttimes\fi{}2)p4g$ ``clock'' reconstruction by scanned energy mode photoelectron diffraction. At low coverage, there is no radial strain of the Ni atoms surrounding t…
Advanced Chemical Physics StudiesBoron and Carbon Nanomaterials ResearchSuperconductivity in MgB2 and Alloys