Catherine P. Raptopoulou、V. Tangoulis、Vassilis Psycharis2000-09-09Inorganic Chemistry
The use of orotic acid (H 3 L) in iron(III) chemistry has yielded a structurally, magnetically, and spectrochemically very interesting complex. The 1:3:3 FeCl 3 ·6H 2 O/H 3 L/aqueous NH 3 reaction system in MeOH gives red (NH 4 )[Fe 3 (μ 3 -OH)(H 2 L) 3 (HL) 3 ]·7.75H 2 O ( 1 ) in high yield. 1 crystallizes in the hex…
Metal complexes synthesis and propertiesMagnetism in coordination complexesLanthanide and Transition Metal Complexes
Manal A. Rawashdeh‐Omary、Christie Larochelle、Howard H. Patterson2000-09-09Inorganic Chemistry
A temperature-dependent photoluminescence study is reported for single crystals of M[Au(CN) 2 ] 3 and M[Ag(CN) 2 ] 3 (M = Tb; Gd; Y). The results indicate that in both Tb[Au(CN) 2 ] 3 and Tb[Ag(CN) 2 ] 3 exclusive excitation of the donor leads to sensitized luminescence for the acceptor, characteristic of the 5 D 4 →…
Luminescence Properties of Advanced MaterialsMagnetism in coordination complexesLanthanide and Transition Metal Complexes
Marco Daturi、Elisabetta Finocchio、Claude Binet 等 9 位作者2000-09-09The Journal of Physical Chemistry B
The objective of this study was to examine the mechanism of the reduction by hydrogen of ceria−zirconia (CZ) mixed oxides having a high BET surface area (100 m 2 g -1 ). Three methods were used in parallel to assess the Ce 3+ content, the surface and bulk oxygen vacancy concentrations, and the resulting oxygen storage…
Catalytic Processes in Materials ScienceCatalysis and Hydrodesulfurization StudiesCatalysis and Oxidation Reactions
C. G. Sonwane、Suresh K. Bhatia2000-09-09The Journal of Physical Chemistry B
In this article, a new hybrid model for estimating the pore size distribution of micro- and mesoporous materials is developed, and tested with the adsorption data of nitrogen, oxygen, and argon on ordered mesoporous materials reported in the literature. For the micropore region, the model uses the Dubinin−Rudushkevich…
Metal-Organic Frameworks: Synthesis and ApplicationsZeolite Catalysis and SynthesisMesoporous Materials and Catalysis
Michael D. Musick、Christine D. Keating、L. Andrew Lyon 等 9 位作者2000-09-09Chemistry of Materials
This manuscript describes the stepwise, ligand-directed assembly, characterization, and prospective applications of three-dimensional Au and Ag nanoparticle, multlilayered films. Films were prepared by successive treatments of a Au nanoparticle monolayer with a bifunctional cross-linker and colloidal Au or Ag solution…
Gold and Silver Nanoparticles Synthesis and ApplicationsQuantum Dots Synthesis And PropertiesMolecular Junctions and Nanostructures
Haojun Liang、Hanning Chen2000-09-08The Journal of Chemical Physics
The thermodynamics of a homopolymer chain with the Lennard-Jones (LJ) potential was studied by the multicanonical Monte Carlo method. The results confirm there indeed exists a liquid–solid-like first-order transition at lower temperatures for a free-joint chain, revealing that the transition is a characteristic of a h…
Phase Equilibria and ThermodynamicsMaterial Dynamics and PropertiesThermodynamic properties of mixtures
Marian Paluch、S. Hensel-Bielówka、Tatiana Psurek2000-09-08The Journal of Chemical Physics
The pressure and temperature dependent dielectric relaxation times are compared with the predictions of the model proposed by Avramov. Remarkable agreement is found in whole P and T plane. It was also pointed out that the tested model predicts no pressure effect on fragility and nonlinear character of pressure depende…
Phase Equilibria and ThermodynamicsMaterial Dynamics and PropertiesGlass properties and applications
Paolo Facci、Marco Fontana、Enrico Dalcanale 等 5 位作者2000-09-08Langmuir
The role of chain length in affecting the molecular organization in thin films of mesogenic Zn−porphyrin octaesters ZnC n OAP has been investigated by means of Langmuir isotherms and area-per-molecule relaxation measurements at the air−water interface, as well as by unpolarized and polarized optical absorption spectro…
Lipid Membrane Structure and BehaviorPorphyrin and Phthalocyanine ChemistrySupramolecular Self-Assembly in Materials
Géraldine F. Drevon、Alan J. Russell2000-09-08Biomacromolecules
The synthesis of polyurethane polymers in the presence of diisopropylfluorophosphatase (DFPase) has enabled the irreversible attachment of the enzyme to the polymeric matrix. The resulting bioplastic hydrolyzes diisopropylfluorophosphate (DFP) in buffered media up to 67% of the rate for the same amount of soluble enzy…
biodegradable polymer synthesis and propertiesMicroplastics and Plastic PollutionPer- and polyfluoroalkyl substances research
Vasant R. Choudhary、Kshudiram Mantri2000-09-08Langmuir
Temperature-programmed desorption (TPD) of benzene on Si−MCM-41, Na−AlSi−MCM-41, and H−AlSi−MCM-41 mesoporous materials from 323 to 673 K at different linear heating rates (5, 10, 20, and 25 K min - 1 ) and that on Si−MCM-41 at different adsorbate loadings (0.45−10.7 μmol g - 1 ) has been investigated. 1 H− 29 Si cros…
Zeolite Catalysis and SynthesisMesoporous Materials and CatalysisAnalytical Chemistry and Chromatography
Tania Weyland、Karine Costuas、Loı̈c Toupet 等 5 位作者2000-09-08Organometallics
The bi- and trinuclear mixed-valence complexes [{Cp*(dppe)Fe(CC−)} 2 (1,3-C 6 H 4 )][PF 6 ] ( 2 + ), [{Cp*(dppe)Fe(CC−)} 3 (1,3,5-C 6 H 3 )][PF 6 ] ( 3 + ), and [{Cp*(dppe)Fe(CC−)} 3 (1,3,5-C 6 H 3 )][PF 6 ] 2 ( 3 2+ ) were prepared either by oxidation of [{Cp*(dppe)Fe(CC−)} 2 (1,3-C 6 H 4 )] ( 2 ) or [{Cp*(dppe)Fe(CC…
Organometallic Complex Synthesis and CatalysisMetal complexes synthesis and propertiesMagnetism in coordination complexes
Roland Horst、H. Henning Winter2000-09-08Macromolecules
The transition from solid to liquid during the melting of a semicrystalline polymer can be viewed as reverse gelation since the physical gel point (state of liquid-to-solid transition) is approached from the solid side. In this study we explore routes of stopping the melting process at the gel point and stabilizing th…
Polymer crystallization and propertiesPolymer composites and self-healingPolymer Foaming and Composites
Masaki Mitani、Hiroki Mori、Yu Takano 等 6 位作者2000-09-08The Journal of Chemical Physics
Polyradicals comprised of m-phenylene-bridged organic radicals are well known as building blocks of organic ferromagnets, in which radical groups are connected with each other at the meta position in the benzene ring, and the parallel-spin configurations between radical sites are more stabilized than the antiparallel…
Magnetism in coordination complexesMolecular Junctions and NanostructuresSynthesis and Properties of Aromatic Compounds
Daniel Bougeard、Konstantin S. Smirnov、Ekkehard Geidel2000-09-08The Journal of Physical Chemistry B
The structure and vibrational spectra of kaolinite have been investigated by the joint use of vibrational spectroscopic techniques and of computational methods. The derived potential is based on ab initio calculations of molecular models and tested in normal mode analyses and molecular dynamics simulations. The calcul…
Clay minerals and soil interactionsIron oxide chemistry and applicationsMineralogy and Gemology Studies
Hugo Destaillats、A. J. Colussi、Jiju M. Joseph 等 4 位作者2000-09-08The Journal of Physical Chemistry A
Most advanced oxidation processes (AOP) readily decolorize but are unable to mineralize aqueous azo dye solutions. The extent of mineralization measured as total organic carbon (TOC) losses during the 500-kHz sonication of azobenzene or methyl orange solutions increases from 20% to more than 80% in the presence of O 3…
TiO2 Photocatalysis and Solar CellsAdvanced oxidation water treatmentUltrasound and Cavitation Phenomena
Marc T. M. Koper、Rutger A. van Santen、Sally A. Wasileski 等 4 位作者2000-09-08The Journal of Chemical Physics
Density Functional Theory (DFT) is utilized to compute field-dependent binding energies and intramolecular vibrational frequencies for carbon monoxide and nitric oxide chemisorbed on five hexagonal Pt-group metal surfaces, Pt, Ir, Pd, Rh, and Ru. The results are compared with corresponding binding geometries and vibra…
Advanced Chemical Physics StudiesElectrocatalysts for Energy ConversionCatalytic Processes in Materials Science
Vladimir L. Safonov、H. Neal Bertram2000-09-08arXiv
Magnetization reversal in a fine ferromagnetic grain is simulated for the case of an instantaneously applied reversal magnetic field. The Hamiltonian of the system contains the exchange interaction, the uniaxial anisotropy, the Zeeman energy and the dipole-dipole interactions. A cubic grain is discretized into 64 cubi…
Materials Science
Sonali Mukherjee、R. E. Cohen、Oguz Gulseren2000-09-08arXiv
We have computed the variation of the vacancy formation energy with pressure for Ta. Total energy calculations were performed for 16 and 54 atom supercells using a mixed basis pseudopotential method which uses pseudo-atomic orbitals and low energy plane waves as the basis set, within density functional theory (LDA and…
Materials Science
Kevin Chen、Xueping Jiang、Lionel C. Kimerling 等 4 位作者2000-09-08Langmuir
Submicron-sized colloidal particles have been self-organized into patterned arrangements on a substrate using a novel technique. At the substrate, a polyelectrolyte multilayer film has been deposited onto a chemically patterned surface; subsequently, the polyelectrolyte surface is immersed in an aqueous colloidal susp…
Photonic Crystals and ApplicationsSurfactants and Colloidal SystemsPolymer Surface Interaction Studies
J. Hone、B. Batlogg、Z. Benes 等 5 位作者2000-09-08arXiv
The electronic spectra of carbon nanotubes and other nanoscale systems are quantized because of their small radii. Similar quantization in the phonon spectra has been difficult to observe because of the far smaller energy scale. We probed this regime by measuring the temperature-dependent specific heat of purified sin…
Carbon Nanotubes in CompositesGraphene research and applicationsThermal properties of materials