Joan Cano、Giovanni De Munno、Francesc Lloret 等 4 位作者2000-03-10Inorganic Chemistry
Unusual single N-bridging thiocyanato and double pyridazine (pdz) bridges occur in the linear trinuclear nickel(II) complex of formula [Ni3(pdz)6(NCS)6]. The compound exhibits a quasi Curie law behavior, the antiferromagnetic coupling through the double 1,2-diazine links being nearly compensated by the ferromagnetic e…
Magnetism in coordination complexesMetal complexes synthesis and propertiesSynthesis and Characterization of Heterocyclic Compounds
Asok K. Dikshit、Arun K. Nandi2000-03-10Macromolecules
Poly(vinylidene fluoride) (PVF 2 ) produces thermoreversible gels in diesters. By variation of the number of intermittent carbon atoms ( n = 0−7) of the diesters, the physical properties of the gels are studied. The morphology of the PVF 2 /diethyl oxalate (DEO) gel is spheroidal, but the morphology of PVF 2 −diethyl…
Polymer Nanocomposites and PropertiesPolymer Science and PVCPolymer crystallization and properties
Hiroshi Watanabe、Tomohiro Sato、Kunihiro Osaki2000-03-10Macromolecules
Dielectric behavior was examined for solutions of a styrene-isoprene-styrene (SIIS) triblock and SI diblock copolymers in an I-selective solvent, n -tetradecane (C14). The SI copolymer had noninverted type-A dipoles in the I block while the SIIS copolymer, a head-to-head coupled dimer of SI, had once-inverted dipoles…
Block Copolymer Self-AssemblyPolymer Nanocomposites and PropertiesRheology and Fluid Dynamics Studies
Marco Giorgetti、Stefano Passerini、William H. Smyrl 等 4 位作者2000-03-10Inorganic Chemistry
Polarized X-ray absorption spectroscopy has been used to study the short-range structure of deposited films of V2O5 xerogel. The material is characterized by a layer of VO5 units with the V-O apical bond perpendicular to the basal (xy) plane. We have focused our attention along the z axis. Experiments were carried out…
Transition Metal Oxide NanomaterialsCatalysis and Oxidation ReactionsGa2O3 and related materials
Didier Astruc2000-03-10Accounts of Chemical Research
This Account focuses on fundamental aspects and applications of the concept of "electron and proton reservoirs". Permethylated electron reservoir iron sandwich complexes, which were known to be excellent reducing agents in their neutral 19e Fe(I) form, have recently been shown to be stable strong oxidants in their dic…
Dendrimers and Hyperbranched PolymersFuel Cells and Related MaterialsLuminescence and Fluorescent Materials
Mario Castro、Rodolfo Cuerno、Angel Sanchez 等 4 位作者2000-03-10arXiv
We present a complete study of the Multiparticle Biased Diffusion-Limited Aggregation (MBDLA) model supplemented with surface difussion (SD), focusing on the relevance and effects of the latter transport mechanism. By comparing different algorithms, we show that MBDLA+SD is a very good qualitative model for electrodep…
cond-mat.dis-nncond-mat.stat-mechnlin.PSMaterials ScienceChemical Physics
Igor I. Smolyaninov2000-03-10arXiv
Recent calculations by Vorobev and Malyshenko (JETP Letters, 71, 39, 2000) show that molecular hydrogen may stay liquid and superfluid in strong electric fields of the order of $4\times 10^7 V/cm$. I demonstrate that strong local electric fields of similar magnitude exist beneath a two-dimensional layer of electrons l…
Strongly Correlated ElectronsMaterials Science
Marc Lätzel、Stefan Luding、Hans J. Herrmann2000-03-10arXiv
One of the essential questions in the area of granular matter is, how to obtain macroscopic tensorial quantities like stress and strain from ``microscopic'' quantities like the contact forces in a granular assembly. Different averaging strategies are introduced, tested, and used to obtain volume fractions, coordinatio…
cond-mat.stat-mechMaterials Science
Karsten Riwotzki、Heike Meyssamy、A. Kornowski 等 4 位作者2000-03-10OpenAlex
Nanocrystals of LaPO 4:Eu and CePO 4:Tb with a mean particle size of 5 nm and a narrow size distribution have been prepared by reacting the corresponding metal chlorides, phosphoric acid, and a base at 200 °C in tris(ethylhexyl) phosphate. Highly crystalline material was obtained as confirmed by X-ray powder diffracti…
Quantum Dots Synthesis And PropertiesLuminescence Properties of Advanced MaterialsRadioactive element chemistry and processing
Jacques A. Delaire、Keitaro Nakatani2000-03-10OpenAlex
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLinear and Nonlinear Optical Properties of Photochromic Molecules and MaterialsJacques A. Delaire and Keitaro NakataniView Author Information Laboratoire de Photophysique et de Photochimie Supramoléculaires et Macromoléculaires (PPSM, UMR 8531 of CNRS), Ecole Normale Supérie…
Photorefractive and Nonlinear OpticsNonlinear Optical Materials ResearchPhotochromic and Fluorescence Chemistry
Garry Berkovic、Valeri Krongauz、Victor U. Weiss2000-03-10OpenAlex
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpiropyrans and Spirooxazines for Memories and SwitchesGarry Berkovic, Valeri Krongauz, and Victor WeissView Author Information Soreq Nuclear Research Center, Yavne 81800, Israel Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel ELOP E…
Photorefractive and Nonlinear OpticsPhotochromic and Fluorescence ChemistryPhotoreceptor and optogenetics research
Philip G. Collins、Keith Bradley、Masa Ishigami 等 4 位作者2000-03-10OpenAlex
The electronic properties of single-walled carbon nanotubes are shown here to be extremely sensitive to the chemical environment. Exposure to air or oxygen dramatically influences the nanotubes' electrical resistance, thermoelectric power, and local density of states, as determined by transport measurements and scanni…
Graphene research and applicationsCarbon Nanotubes in CompositesFullerene Chemistry and Applications
Е. А. Ганьшина、O. Yu. Gorbenko、A G Smechova 等 6 位作者2000-03-09Journal of Physics Condensed Matter
Magneto-optical properties were measured for (La 1- x Pr x ) 0.7 Ca 0.3 MnO 3 ( x = 0, 0.25, 0.5, 0.75, 1) ceramic solid solutions, including temperature, magnetic field, oxygen isotope content and spectral dependences of the transverse Kerr effect (TKE). The TKE spectra after the transition to the ferromagnetic metal…
Multiferroics and related materialsAdvanced Condensed Matter PhysicsMagnetic and transport properties of perovskites and related materials
Artem L. Ponomarev、Thomas D. Sewell、C. J. Durning2000-03-09Macromolecules
We investigate by lattice Monte Carlo simulation the kinetics of adsorption of isolated linear homopolymers onto a flat surface with a strong, short-ranged attraction for the segments. We focus on limiting cases corresponding to strong physisorption and chemisorption. Initially, the polymer has a conformation represen…
Polymer Surface Interaction StudiesMaterial Dynamics and PropertiesTheoretical and Computational Physics
Shinichi Sakida、Satoshi Hayakawa、Toshinobu Yoko2000-03-09Journal of Physics Condensed Matter
The structures of V 2 O 5 -TeO 2 glasses are investigated by means of 125 Te and 51 V static NMR spectroscopies and the local structures around the Te and V atoms are discussed in detail from the respective NMR spectra. The fraction of TeO 3 trigonal pyramids increases and that of TeO 4 trigonal bipyramids decreases w…
Catalysis and Oxidation ReactionsPhase-change materials and chalcogenidesGlass properties and applications
Chwen‐Jen Shieh、Yu-Fu Lai2000-03-09Journal of Agricultural and Food Chemistry
Response surface methodology (RSM) and 3-level-3-factor fractional factorial design were used to evaluate the effects of synthesis parameters, including reaction time (4 to 8 h), temperature (110 to 130 degrees C), and substrate molar ratio of fatty acid methyl esters (FAME) from soybean oil to methyl glucoside (4:1 t…
Biopolymer Synthesis and Applicationsbiodegradable polymer synthesis and propertiesSynthesis and properties of polymers
L. Kielhorn、Ralph H. Colby、C. C. Han2000-03-09Macromolecules
We investigated the relaxation of a binary polybutadiene/polyisoprene blend after the cessation of steady-state shear using both in situ optical microscopy (OM) and light scattering (LS). Through fast Fourier transforms of the micrographs, we were able to directly relate our LS patterns with the real space morphology.…
Material Dynamics and PropertiesRheology and Fluid Dynamics StudiesPolymer crystallization and properties
Høgni Weihe、Hans U. Güdel、Hans Toftlund2000-03-09Inorganic Chemistry
The superexchange interactions in four three-center model systems A-L-B, for A and B being paramagnetic centers and L a diamagnetic bridging ligand, are analyzed by valence bond configuration interaction models in combination with fourth-order perturbation theory. We analyze the four distinct cases where a bridging li…
Advanced Condensed Matter PhysicsMagnetic and transport properties of perovskites and related materialsMagnetism in coordination complexes
M. Eshel、Avi Bino、I. Felner 等 6 位作者2000-03-09Inorganic Chemistry
A novel cyclic octanuclear chromium(III) complex with hydroxo and acetato bridging ligands was isolated and its structure determined by X-ray crystallography. The complex [Cr8(OH)12(OAc)12] (1) (OAc- = CH3CO2-), as found in crystals of 1.34H2O, is obtained by refluxing an aqueous solution of the trinuclear "basic" chr…
Polyoxometalates: Synthesis and ApplicationsMagnetism in coordination complexesMetal complexes synthesis and properties
Kenji Tabata、Hideki Abe、Yoshiharu Doi2000-03-09Biomacromolecules
Microbial degradation of thermally synthesized poly(aspartic acid) (PAA) was investigated. A PAA-P1 sample (Mn, 7500; Mw, 20,000; number of branched units/100 monomer units, 3.1) was completely degraded in natural river water within 15 days at 25 degrees C. A new PAA-degrading bacterium (strain KP-2: JCM10638) was iso…
biodegradable polymer synthesis and propertiesChromium effects and bioremediationBone Tissue Engineering Materials