Marie‐Christine Daniel、Jaimé Ruiz、Jean‐Claude Blais 等 5 位作者2003-09-11Chemistry - A European Journal
A family of five metallodendrimers with pentamethylamidoferrocenyl termini were synthesized from the DSM dendrimers G(n)-DAB-dend-(NH(2))(x) (x=4, 8, 16, 32, 64) and characterized by standard techniques, including prominent molecular peaks (broad for x=64) in their MALDI-TOF mass spectra. Oxidation of G(4)-DAB-dend-(N…
Molecular Sensors and Ion DetectionDendrimers and Hyperbranched PolymersFerrocene Chemistry and Applications
Olivier Cador、F. Chabre、Andrea Dei 等 6 位作者2003-09-11Inorganic Chemistry
The mixed-ligand complexes [Co(III)(tpy)(Cat-N-SQ)]Y and [Ni(II)(tpy)(Cat-N-BQ)]PF(6) (tpy = 2,2':6',2' '-terpyridine; Cat-N-BQ, Cat-N-SQ = mononegative and radical dinegative Schiff base diquinone ligand; Y = PF(6), BPh(4)) were prepared. Structural and spectroscopic data support the different charge distribution of…
Metal complexes synthesis and propertiesMagnetism in coordination complexesLanthanide and Transition Metal Complexes
Kannan Balasubramanian、Marcel G. Friedrich、Chaoyang Jiang 等 7 位作者2003-09-11Advanced Materials
Electrochemical coating of individual single‐walled carbon nanotubes (SWCNTs) with thin films obtained via oxidative coupling of an amine or reductive coupling of an aromatic diazonium salt is reported. The same SWCNTs have been characterized before and after modification by electrical transport measurements and confo…
Conducting polymers and applicationsMolecular Junctions and NanostructuresElectrochemical Analysis and Applications
J. Zygmunt、Frank Krumeich、Reinhard Nesper2003-09-11Advanced Materials
Vanadium oxide hydrate has been used in a new, robust, and inexpensive shape‐templating synthesis leading to silica nanotubes (SiO 2 ‐NTs, see Figure) with good chemical purity, a well‐defined morphology, and high aspect ratio. Unidimensional nanosized cavities or channels are made accessible through the open ends of…
Catalytic Processes in Materials ScienceMesoporous Materials and CatalysisCatalysis and Oxidation Reactions
Akira Baba、Jörn Felix Lübben、Kaoru Tamada 等 4 位作者2003-09-11Langmuir
In this paper, we report on in situ optical/electrochemical investigations using a combination of surface plasmon resonance spectroscopy and electrochemistry in order to determine the complex dielectric constants of poly(3,4-ethylenedioxythiophene) (PEDOT) thin films. The PEDOT films were deposited by in situ electrop…
Conducting polymers and applicationsElectrochemical Analysis and ApplicationsAnalytical Chemistry and Sensors
S.Ya. Istomin、J. Grins、Gunnar Svensson 等 7 位作者2003-09-11Chemistry of Materials
The perovskite-related crystal structure of the compound Sr 0.7 Y 0.3 CoO 2.62 was determined and refined using synchrotron X-ray and neutron powder diffraction, in space group I 4/ mmm, a = 7.6237(8) Å and c = 15.314(2) Å, to R I = 0.041 in the synchrotron data set. It contains layers of CoO 6 octahedra, perpendicula…
Magnetic and transport properties of perovskites and related materialsAdvanced Condensed Matter PhysicsElectronic and Structural Properties of Oxides
Verónica Salgueiriño、Frank Caruso、Luis M. Liz‐Marzán2003-09-11The Journal of Physical Chemistry B
Tailored optical properties have been imparted to polystyrene (PS) colloids of various sizes by the layer-by-layer (LbL) assembly of silica-coated gold (Au@SiO 2 ) or silica-coated silver (Ag@SiO 2 ) nanoparticles with different shell thicknesses and an electrostatically bridging polyelectrolyte, poly(diallyldimethyla…
Gold and Silver Nanoparticles Synthesis and ApplicationsPhotonic Crystals and ApplicationsPolymer Surface Interaction Studies
Sangyun Lim、Dragoş Ciuparu、Chanho Pak 等 8 位作者2003-09-11The Journal of Physical Chemistry B
Highly ordered cobalt substituted MCM-41 samples were synthesized and characterized for application as catalytic templates for producing aligned single walled carbon nanotubes (SWNT). Highly reproducible Co−MCM-41 samples were successfully synthesized using alkyl templates with 10, 12, 14, 16, and 18 carbon chain leng…
Carbon Nanotubes in CompositesSupercapacitor Materials and FabricationMesoporous Materials and Catalysis
Andrés de la Escosura、M. Victoria Martínez‐Díaz、Pall Thordarson 等 6 位作者2003-09-11Journal of the American Chemical Society
A novel donor-acceptor bisphthalocyanine (bis-Pc, 1) in which two different Pc units (Zn(II)-Pc and Ni(II)-Pc) are linked via vinylene spacers to the pseudopara positions of a central [2.2]paracyclophane moiety is described. The synthesis of 1 is achieved by two successive Heck reactions of pseudopara-divinyl[2.2]para…
Supramolecular Chemistry and ComplexesPorphyrin and Phthalocyanine ChemistrySurface Chemistry and Catalysis
S. T. Chui、Z. F. Lin、L. -B. Hu2003-09-11arXiv
There is recently interests in the ``left-handed '' materials. In these materials the direction of the wave vector of electromagnetic radiation is opposite to the direction of the energy flow. We present simple arguments that suggests that magnetic composites can also be left-handed materials. However, the physics inv…
Materials Science
Cynthia A. Stowell、Robert J. Wiacek、Aaron E. Saunders 等 4 位作者2003-09-11Nano Letters
Organic monolayer-passivated Group III−V dilute magnetic semiconductor (DMS) Mn x In 1 - x As nanocrystals, ranging from 2.2 to 10 nm in diameter, were synthesized by high-temperature colloidal arrested precipitation using the dehalosilylation of InCl 3 and MnBr 2 with tristrimethylsilylarsine in the coordinating solv…
Semiconductor Quantum Structures and DevicesQuantum Dots Synthesis And PropertiesChalcogenide Semiconductor Thin Films
Kilwon Cho、Dohwan Kim、Soong Yoon2003-09-11Macromolecules
The effect of substrate surface energy on transcrystalline growth at the interface of a semicrystalline polymer and its effect on interfacial adhesion were investigated for substrates treated with various silane coupling agents. A thin film of isotactic polypropylene (iPP) crystallized on a high surface energy substra…
Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesForce Microscopy Techniques and Applications
Mario Ruben、Esther Breuning、Jean‐Maríe Lehn 等 7 位作者2003-09-11Chemistry - A European Journal
The magnetism of a series of tetranuclear complexes of the [Fe4IIL4]8+ [2x2]-grid-type was investigated, revealing the occurrence of spin transition behavior within this class of compounds. The phenomenon depends directly on the nature of the substituent R(1) in the 2-position on the central pyrimidine group of the li…
Metal complexes synthesis and propertiesMagnetism in coordination complexesLanthanide and Transition Metal Complexes
Andrea Biffis、Niccolò Orlandi、Benedetto Corain2003-09-11Advanced Materials
Soluble crosslinked macromolecules (microgels) used as stabilizers of catalytically active metal nanoclusters allow control of the nanocluster size by simply changing the crosslinking degree of the microgel. Microgel‐stabilized metal nanoclusters are easily prepared and stored in the solid state, and those of Pd (see…
Gold and Silver Nanoparticles Synthesis and ApplicationsNanocluster Synthesis and ApplicationsNanomaterials for catalytic reactions
V. V. Khovailo、V. A. Chernenko、A. A. Cherechukin 等 5 位作者2003-09-11arXiv
We have studied the influence of alloying with a fourth element on the temperature of ferromagnetic ordering $T_C$ in Ni-Mn-Ga Heusler alloys. It is found that $T_C$ increases or decreases, depending on the substitution. The increase of $T_C$ is observed when Ni is substituted by either Fe or Co. On the contrary, the…
Materials Science
T. Ono、A. Kogusu、S. Morimoto 等 7 位作者2003-09-11arXiv
We report a new spin-injection effect found for a manganite using a specially fabricated sample. A wire of La0.7Sr0.3MnO3 was patterned by means of focused ion beam etching, and the central part was subsequently irradiated with Ga+ ions lightly. The ferromagnetic Curie temperature was reduced locally by the irradiatio…
Materials Science
M. D. Stiles、Jiang Xiao、A. Zangwill2003-09-11arXiv
We solve appropriate drift-diffusion and Landau-Lifshitz-Gilbert equations to demonstrate that unpolarized current flow from a non-magnet into a ferromagnet can produce a precession-type instability of the magnetization. The fundamental origin of the instability is the difference in conductivity between majority spins…
Materials Science
Jerome Weiss、M. -Carmen Miguel2003-09-11arXiv
Recently, mechanical tests on ice as well as dislocation dynamics simulations have revealed that plastic flow displays a scale-free intermittent dynamics characterized by dislocation avalanches with a power law distribution of amplitudes. To further explore the complexity of dislocation dynamics during plastic flow, w…
Materials Science
Brian K. H. Yen、Nathan E. Stott、Klavs F. Jensen 等 4 位作者2003-09-11Advanced Materials
A microcapillary flow reactor has been used to prepare a size series of colloidal CdSe nanocrystals (NCs). The continuous‐flow method (see Figure for schematic) produces samples with size distributions and quantum yields comparable to those prepared in conventional batch processes. The results obtained from the reacto…
Quantum Dots Synthesis And Properties
Chi‐Wai Wan、Armin Burghart、Jiong Chen 等 10 位作者2003-09-11Chemistry - A European Journal
Compounds based on the 4,4-difluoro-1,3,5,7-tetramethyl-4-bora-3a,4a-diaza-s-indacene (BODIPY) framework are excellent fluorescent markers. When BODIPY dyes of this type are conjugated to functionalities that absorb at relatively short wavelengths, those functionalities can, in some molecules, transmit the absorbed en…
Supramolecular Chemistry and ComplexesPorphyrin and Phthalocyanine ChemistryLuminescence and Fluorescent Materials