Peng Chen、David E. Root、Cecelia Campochiaro 等 5 位作者2002-12-13Journal of the American Chemical Society
Magnetic, vibrational, and optical techniques are combined with density functional calculations to elucidate the electronic structure of the diamagnetic mononuclear side-on CuII-superoxo complex. The electronic nature of its lowest singlet/triplet states and the ground-state diamagnetism are explored. The triplet stat…
Metal-Catalyzed Oxygenation MechanismsMagnetism in coordination complexesLanthanide and Transition Metal Complexes
L Starrs、Paul D. Bartlett2002-12-13Journal of Physics Condensed Matter
In recent years optical tracer techniques have been developed to determine the micro-rheology of soft viscoelastic materials. Recent theoretical arguments (Levine A J and Lubensky T C 2001 Phys. Rev. E 65 011501) suggest that the correlated fluctuations of a pair of widely separated probe particles should reflect the…
Rheology and Fluid Dynamics StudiesSurfactants and Colloidal SystemsMaterial Dynamics and Properties
C. Grimaldi、T. Maeder、P. Ryser 等 4 位作者2002-12-13arXiv
We re-analyse earlier measurements of resistance R and piezoresistance K in RuO2-based thick-film resistors. The percolating nature of transport in these systems is well accounted by values of the transport exponent t larger than its universal value t=2.0. Furthermore, we show that the RuO2 volume fraction dependence…
cond-mat.dis-nnMaterials Science
Ping‐Heng Tan、Long An、LuQi Liu 等 9 位作者2002-12-13Physical review. B, Condensed matter
The Stokes and anti-Stokes Raman spectra of a multiwalled carbon nanotube (MWNT) sample are studied here by four excitation energies and the observed Raman modes are assigned based on the double resonance Raman effect and the previous results in graphite whiskers. There exists frequency discrepancy between Stokes and…
Carbon Nanotubes in CompositesDiamond and Carbon-based Materials ResearchGraphene research and applications
Leo Radzihovsky、Noel A. Clark2002-12-13arXiv
We point out that the phenomenon ``heating by freezing'' discovered in nonequilibrium simulations by Helbing, et al. (PRL 84, 1240 (2000)) extends to equilibrium systems as well. We argue that such reentrant fluctuation-driven freezing can, for example, be realized in two-dimensional colloidal systems subjected to a o…
Materials Sciencecond-mat.stat-mechSoft Condensed Matter
A. Yamasaki、Takeo Fujiwara2002-12-13Physical review. B, Condensed matter
The quasiparticle band structures of nonmagnetic monoxides $M\mathrm{O}$ $(M=\mathrm{Mg},$ Ca, Ti and V), are calculated by the GW approximation. The band gap and the width of occupied oxygen $2p$ states in insulating MgO and CaO agree with experimental observation. In metallic TiO and VO, conduction bands originated…
ZnO doping and propertiesX-ray Diffraction in CrystallographyHeusler alloys: electronic and magnetic properties
Jules C. A. A. Roelofs、Jeroen A. van Bokhoven、A.J. van Dillen 等 5 位作者2002-12-13Chemistry - A European Journal
The thermal decomposition of hydrotalcites (HTs) with different interlayer anions in the 298-523 K region has been investigated by using transmission electron microscopy (TEM), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and IR, 27Al MAS-NMR and X-ray absorption near-edge structure (XANES) spectroscopy.…
Thermal Expansion and Ionic ConductivityMagnesium Oxide Properties and ApplicationsLayered Double Hydroxides Synthesis and Applications
Clem E. Powell、Marie P. Cifuentes、Joseph P. Morrall 等 8 位作者2002-12-13Journal of the American Chemical Society
A combination of cyclic voltammetry, UV-vis-NIR spectroelectrochemistry, time-dependent density functional theory (TD-DFT), and Z-scan measurements employing a modified optically transparent thin-layer electrochemical (OTTLE) cell has been used to identify and assign intense transitions of metal alkynyl complexes at t…
Photochemistry and Electron Transfer StudiesConducting polymers and applicationsPorphyrin and Phthalocyanine Chemistry
J. Myslivecek、C. Schelling、F. Schaffler 等 7 位作者2002-12-13arXiv
Scanning tunneling microscopy experiments show that the unstable growth morphology observed during molecular beam homoepitaxy on slightly vicinal Si(001) surfaces consists of straight step bunches. The instability occurs under step- flow growth conditions and vanishes both during low-temperature island growth and at h…
Materials Science
T. Mueller、K. -H. Heinig、W. Moeller2002-12-13arXiv
Kinetic 3D lattice Monte Carlo studies are presented on Si nanocrystal (NC) formation by phase separation in 1 keV Si implanted thin SiO2 films. The simulation start from Si depth profiles calculated using the dynamic, high-fluence binary collision code TRIDYN. From the initial Si supersaturation, NCs are found to for…
cond-mat.stat-mechMaterials Science
M. Patriarca、M. Robles、K. Kaski2002-12-13arXiv
We show that a microscopic definition of crystal defect, based on the effective mean single-particle potential energy, makes it possible to detect and visualize various types of local and extended crystal defects and develop an effective algorithm for tracking their time evolution.
Materials Science
Richard D. Averitt、Antoinette J. Taylor2002-12-13Journal of Physics Condensed Matter
We review the application of ultrafast optical spectroscopy in the study of correlated electron materials. The emphasis is on all-optical pump–probe and optical pump–far-infrared probe experiments on (a) colossal-magnetoresistance manganites and (b) high-temperature superconductors. The experimental techniques are dis…
Magnetic and transport properties of perovskites and related materialsPhysics of Superconductivity and MagnetismAdvanced Condensed Matter Physics
Jiazheng Lao、Jianyu Huang、Deng Wang 等 4 位作者2002-12-13OpenAlex
Wurtzite ZnO nanobridges and aligned nanonails have been synthesized by thermal vapor transport and condensation method. The nanobridges have two rows of c -axis ZnO nanorods epitaxailly grown on the edges of the {0001} plane of the ZnO nanobelt. Some variations of the nanobridges have also been observed. The ZnO nano…
ZnO doping and propertiesGas Sensing Nanomaterials and SensorsGa2O3 and related materials
Jiaxing Huang、Shabnam Virji、Bruce H. Weiller 等 4 位作者2002-12-13OpenAlex
Polyaniline nanofibers with uniform diameters between 30 and 50 nm can be made in bulk quantities through a facile aqueous/organic interfacial polymerization method at ambient conditions. The nanofibers have lengths varying from 500 nm to several micrometers and form interconnected networks. Thin films made of the nan…
Analytical Chemistry and SensorsConducting polymers and applicationsElectrochemical sensors and biosensors
FE Eichie、R. S. Okor、R Gröning2002-12-12Journal of Applied Polymer Science
Abstract In order to optimize the formulation of the acrylate methacrylate (AMA) coating systems, the partial solubility parameters of AMA and those of various coating solvents and plasticizers have been computed using the group contribution method of Van Krevelan and Hoftyzer. The data were analyzed in accordance wit…
Crystallization and Solubility StudiesPhase Equilibria and ThermodynamicsAnalytical Chemistry and Chromatography
Stephen F. Hahn、Marc A. Hillmyer2002-12-12Macromolecules
Polyindene was prepared by the controlled cationic polymerization of indene initiated with cumyl methyl ether/TiCl 4 in CH 2 Cl 2 at −65 °C. The number-average molecular weight was controlled by the ratio of monomer to cumyl methyl ether; polydispersity indicies ranged from 1.8 to 3. Polyindene samples prepared by thi…
Polymer crystallization and propertiesBlock Copolymer Self-AssemblyAdvanced Polymer Synthesis and Characterization
Qihua Yang、Christophe Copéret、Can Li 等 4 位作者2002-12-12New Journal of Chemistry
Silica-supported molybdenum surface complexes were prepared by the reaction between (N)Mo(OtBu)3 and silica via displacement of the tert-butoxy ligands for siloxyls from the silica surface. The structure of the surface molybdenum complexes was well defined by in-situ FT-IR, elemental analysis, 1H NMR and 13C CP/MAS NM…
Polyoxometalates: Synthesis and ApplicationsMesoporous Materials and CatalysisSynthetic Organic Chemistry Methods
Ken Yao、Satoshi Nishimura、Yusuke Imai 等 8 位作者2002-12-12Langmuir
Different spectroscopic and photoelectrochemical behaviors were observed when racemic and enantiomeric [Ru(bpy) 3 ] 2+ complexes were intercalated in the interlayer of K 4 Nb 6 O 17, even for the same intercalation amount. The results are interpreted in terms of the stronger interaction between racemic [Ru(bpy) 3 ] 2+…
Ferroelectric and Piezoelectric MaterialsPolyoxometalates: Synthesis and ApplicationsLayered Double Hydroxides Synthesis and Applications
Ralf A. Findeis、Lutz H. Gade2002-12-12European Journal of Inorganic Chemistry
Abstract An efficient strategy for the backbone functionalization of a tripodal phosphane ligand which allows its attachment to solid supports and polymers has been developed. Using pentaerythrol ( 1 ) as the starting material, the functionalized phosphane tripod HOCH 2 CH 2 OCH 2 C(CH 2 PPh 2 ) 3 ( 9 ) was obtained i…
Metal complexes synthesis and propertiesFerrocene Chemistry and ApplicationsDendrimers and Hyperbranched Polymers
Jian Yang、Can Xue、Shu‐Hong Yu 等 5 位作者2002-12-12Angewandte Chemie
Ein einzähniger Ligand dient als Solvens: Durch Solvothermalsynthesen in n-Butylamin wurden Chalkogenid-Nanostäbe mit Halbleitereigenschaften aus leicht zugänglichen anorganischen Reaktanten erhalten. Das Amin eignete sich ausgezeichnet zur Formsteuerung von CdS-, CdSe-, ZnSe- und PbSe-Nanostäben (siehe Bild) unter re…
Quantum Dots Synthesis And PropertiesNanocluster Synthesis and ApplicationsChalcogenide Semiconductor Thin Films