Benedetto Corain、Karel Jeřábek、Paolo Centomo 等 4 位作者2004-02-11Angewandte Chemie International Edition
Resin molds for clusters: The nanoporous domains of a gel-type microporous functional resin are used as templates for the production of size-controlled Pd0 nanoclusters, the size of which is governed by the largest mesh available (see picture). Inverse steric exclusion chromatography provides the quantitative estimate…
Nanomaterials for catalytic reactionsAnalytical Chemistry and ChromatographyMesoporous Materials and Catalysis
Constantinos M. Paleos、Dimitris Tsiourvas、Zili Sideratou 等 4 位作者2004-02-11Biomacromolecules
A novel dendrimeric compound is designed with the objective of simultaneously addressing issues commonly encountered in drug delivery, i.e., stability in biological milieu as well as targeting. For this purpose, a multifunctional dendrimeric system derived from diaminobutane poly(propylene imine) dendrimers (DAB) is p…
Advanced Polymer Synthesis and CharacterizationRNA Interference and Gene DeliveryDendrimers and Hyperbranched Polymers
Brian Utter、R. P. Behringer2004-02-11arXiv
Diffusivity is a key quantity in describing velocity fluctuations in granular materials. These fluctuations are the basis of many thermodynamic and hydrodynamic models which aim to provide a statistical description of granular systems. We present experimental results on diffusivity in dense, granular shear in a 2D Cou…
Soft Condensed MatterMaterials Science
Mario J. de Oliveira、Alberto Petri、Tania Tome2004-02-11arXiv
We present here new evidence that after a quench the planar Potts model on the square lattice relaxes towards a glassy state if the number of states q is larger than four. By extrapolating the finite size data we compute the average energy of these states for the infinite system with periodic boundary conditions, and…
cond-mat.stat-mechMaterials Science
Lin Yanhong、Wang Dejun、Zhao Qidong 等 5 位作者2004-02-11The Journal of Physical Chemistry B
The ZnO quantum dots (about 3 nm in average size) and the ZnO nanorods (about 80 nm in length and 14 nm in width) were synthesized by the sol−gel method. They were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), UV−vis spectroscopy, and photoluminescence (PL) spectroscopy. The…
Quantum Dots Synthesis And PropertiesGa2O3 and related materialsZnO doping and properties
Zhonghua Peng2004-02-11OpenAlex
Hybrid materials based on covalently linked inorganic polyoxometalates (POMs) and organic species containing a delocalized pi system have drawn increasing attention. These hybrids, traditionally prepared by cluster assembly approaches that lack predictability and controllability, can now be synthesized through common…
Vanadium and Halogenation ChemistryChemical Synthesis and ReactionsPolyoxometalates: Synthesis and Applications
Chengzhong Yu、Jie Fan、Bozhi Tian 等 4 位作者2004-02-11OpenAlex
Synthetic conditions such as temperature, stirring rate, ionic strength, acidity, and reactant ratios that affect the mesostructures and macrostructures of mesoporous materials have been extensively studied in the nonionic block copolymer templating system. Highly ordered SBA-15 materials with ∼100% rodlike morphologi…
Mesoporous Materials and CatalysisMetal-Organic Frameworks: Synthesis and ApplicationsPolyoxometalates: Synthesis and Applications
Ming‐Qiang Zhu、Li‐Qiong Wang、Gregory J. Exarhos 等 4 位作者2004-02-11OpenAlex
Thermosensitive gold nanoparticles were fabricated by conjugating Au with a thiol-terminated poly(N-isopropylacrylamide) or PPA; this polymer stabilizer exhibits a temperature transition while undergoing a hydrophilic to hydrophobic transformation. The introduction of PPA onto gold nanoparticles has sensitized Au nano…
Pickering emulsions and particle stabilizationNanocluster Synthesis and ApplicationsGold and Silver Nanoparticles Synthesis and Applications
D. C. Look、B. Claflin2004-02-11OpenAlex
Abstract Both n‐type and p‐type ZnO will be required for development of homojunction light‐emitting diodes (LEDs) and laser diodes (LDs). It is easy to obtain strong n‐type ZnO, but very difficult to create consistent, reliable, high‐conductivity p‐type material. The most natural choice of an acceptor dopant is N, sub…
Gas Sensing Nanomaterials and SensorsZnO doping and propertiesGa2O3 and related materials
Belkacem Benmerad、Acoura Guehria-Laïdoudi、Slimane Dahaoui 等 4 位作者2004-02-10Acta Crystallographica Section C Crystal Structure Communications
The title compound, triaquatris(glutarato)dilanthanum(III) dihydrate, [[La2(C5H6O4)3(H2O)3] x 2H2O]n, is the first reported glutarate coordination polymer of lanthanum(III) without a protonated ligand. The noteworthy features in the structure are, firstly, the unusual binuclear lanthanum cage formed by three bridging…
Metal-Organic Frameworks: Synthesis and ApplicationsMagnetism in coordination complexesLanthanide and Transition Metal Complexes
Christine Reinhard、Karl W. Krämer、Daniel Biner 等 4 位作者2004-02-10The Journal of Chemical Physics
K2NaScF6 crystals codoped with V3+ and Er3+ exhibit some novel cooperative near-IR to visible upconversion processes at cryogenic temperatures. V3+ mainly acts as a broadband sensitizer. The V3+ 3T1g --> 3T2g excitation between 13,500 and 15,500 cm(-1), after fast relaxation to V3+ 1T2g, can be transferred to Er3+ 4I(…
Glass properties and applicationsLuminescence Properties of Advanced MaterialsSolid State Laser Technologies
Mark Saeys、Joris Thybaut、Matthew Neurock 等 4 位作者2004-02-10Molecular Physics
A fundamental kinetic model was constructed from first principles for the hydrogenation of benzene over a Pt(111) catalyst. Benzene adsorbs at the hollow and the bridge sites of the Pt(111) surface. Benzene at the hollow site is the reactive species, whereas benzene at the bridge site is too strongly bound. Hydrogenat…
Catalytic Processes in Materials ScienceCatalysis and Hydrodesulfurization StudiesZeolite Catalysis and Synthesis
Marenori Kawamura、Yoshiaki Goto、Susumu Sato2004-02-10Japanese Journal of Applied Physics
We propose a Stokes parameter method for determining two-dimensional (2D) cell parameter distributions such as a pretilt angle in addition to the cell thickness and the twist angle of the twisted nematic liquid crystal display (TNLCD) by measuring Stokes parameters at plural wavelengths including a near-infrared regio…
Advanced Optical Imaging TechnologiesLiquid Crystal Research AdvancementsPhotonic Crystals and Applications
Christoph Wagner、Christian Raschke、Kurt Merzweiler2004-02-10Applied Organometallic Chemistry
Abstract The crystal structure of i Pr 4 Sn 4 S 6 consists of isolated molecules that contain an adamantane‐like Sn 4 S 6 core. The tin atoms are coordinated nearly tetrahedrally, with Sn–S distances ranging from 2.397(1) to 2.411(1) Å. Copyright © 2004 John Wiley & Sons, Ltd.
Crystal Structures and PropertiesInorganic Chemistry and MaterialsIron-based superconductors research
Rodion V. Panin、R.V. Shpanchenko、А. В. Миронов 等 10 位作者2004-02-10Chemistry of Materials
The new vanadyl phosphate Na 4 VO(PO 4 ) 2 was synthesized and investigated by X-ray powder and single-crystal diffraction, high-temperature X-ray diffraction, electron diffraction, high-resolution electron microscopy, thermal analysis, magnetic susceptibility, and conductivity measurements. The compound undergoes a r…
Polyoxometalates: Synthesis and ApplicationsChemical Synthesis and CharacterizationCrystal Structures and Properties
K. M. Yu、W. Walukiewicz、Junqiao Wu 等 8 位作者2004-02-10physica status solidi (b)
Abstract Using oxygen ion implantation and pulsed laser melting, we have synthesized thin films of highly mismatched ternary ( y = 0) and quaternary ( y = 0.12) Zn 1− y Mn y O x Te 1− x alloys with oxygen content in excess of x ∼ 0.01. We show that incorporation of a small amount of isoelectronic oxygen leads to the f…
Semiconductor Quantum Structures and DevicesChalcogenide Semiconductor Thin FilmsQuantum Dots Synthesis And Properties
Takashi Ikuno、Mitsuhiro Katayama、Norihiro Yamauchi 等 8 位作者2004-02-10Japanese Journal of Applied Physics
Carbon nanotubes (CNTs) were grown by low-pressure thermal chemical vapor deposition using pure ethylene. It was found that straight CNTs, which were composed of bundled single- or double-wall CNTs and multiwall CNTs, were preferentially bridged between Fe nanoparticles under a low pressure of 100 Pa. Moreover, utiliz…
Carbon Nanotubes in CompositesGraphene research and applicationsDiamond and Carbon-based Materials Research
I. Suemune、ABM. Almamun Ashrafi、Masato Ebihara 等 8 位作者2004-02-10physica status solidi (b)
Abstract Control of ZnO and CdO crystalline structures and p‐type doping in ZnO were studied. Formation of zincblende ZnO layers as well as zincblende CdO/ZnO short‐period superlattices (SPSL) are demonstrated and bright luminescence was observed even at room temperature from the CdO/ZnO SPSL. p‐Type conductivity obse…
ZnO doping and propertiesGa2O3 and related materialsGas Sensing Nanomaterials and Sensors
Geminiano Martínez‐Ponce、Tsveta Petrova、Natalia Tomova 等 6 位作者2004-02-10Journal of Optics A Pure and Applied Optics
We present a spectrophotometric investigation of the processes in three azobenzene polymers induced by a linearly polarized Ar beam (488 nm). The polymers differ only in the length of the spacers attaching the chromophores to the main chain. The experimental results show that this difference determines not only the po…
Photochromic and Fluorescence ChemistrySynthesis and Properties of Aromatic CompoundsLiquid Crystal Research Advancements
K. Ogata、T. Komuro、K. Hama 等 7 位作者2004-02-10physica status solidi (b)
Abstract Undoped ZnO layers grown by molecular beam epitaxy (MBE) were investigated aiming at biosensing devices based on organic/inorganic hybrid structures. Clear observation of free exciton emission in low temperature photoluminescence (PL) spectra and electron mobility as high as 114 cm2/Vs at room temperature ind…
Ga2O3 and related materialsZnO doping and propertiesGas Sensing Nanomaterials and Sensors