Maria Pia Donzello、Claudio Ercolani、A. A. Gaberkorn 等 8 位作者2003-08-22Chemistry - A European Journal
Co-cyclization of 1,2,5-thiadiazole-3,4-dicarbonitrile and 3,6-diamyloxyphthalodinitrile in the presence of magnesium or lithium amylate in amyl alcohol leads to mixtures containing the Mg derivatives of the symmetrical species tetrakis(1,2,5-thiadiazolo)porphyrazine, (S(4))PzH(2), and tetrakis(1,4-diamyloxybenzo)porp…
Magnetism in coordination complexesPorphyrin and Phthalocyanine ChemistryNonlinear Optical Materials Studies
Stephen P. Collins、David Laundy、В. Е. Дмитриенко 等 5 位作者2003-08-22Physical review. B, Condensed matter
We have measured the resonance spectrum of glide-plane forbidden x-ray diffraction in hexagonal ZnO as a function of temperature. This is the only method to observe deformations of the electronic states caused by thermal atomic motion. The results provide the first evidence for a complex line shape in the spectrum of…
Magnetic and transport properties of perovskites and related materialsAdvanced Condensed Matter PhysicsX-ray Diffraction in Crystallography
Pinghua Ge、Paul R. Selvin2003-08-22Bioconjugate Chemistry
Luminescent lanthanide complexes have unusual spectroscopic characteristics, including millisecond excited-state lifetime and sharply spiked emission spectra. These characteristics make them valuable alternatives to conventional organic fluorescent probes in detection applications and for measuring nanometer-scale con…
Metal complexes synthesis and propertiesMagnetism in coordination complexesLanthanide and Transition Metal Complexes
Shengli Zhang、Minggang Xia、Shumin Zhao 等 5 位作者2003-08-22Physical review. B, Condensed matter
The specific heat of single-walled carbon nanotubes (SWNT's) is studied theoretically in this paper. Making use of the continuum model, phonon dispersion relations are derived numerically and analytically. Finally, expressions for specific heat versus temperature are derived theoretically, and we find that the lattice…
Carbon Nanotubes in CompositesThermal properties of materialsMechanical and Optical Resonators
Jingyang Wang、Yanchun Zhou2003-08-22Journal of Physics Condensed Matter
Based on first-principles pseudopotential total energy calculations, the effects of Al substitution in Ti 3 SiC 2 , yielding chemical formula Ti 3 Si 0.75 Al 0.25 C 2 , were studied by examining the equilibrium properties and electronic structure. The lattice configurations, cohesive energy, atomic bonding properties…
Aluminum Alloys Composites PropertiesIntermetallics and Advanced Alloy PropertiesMXene and MAX Phase Materials
Libor Vyklický、S. Holger Eichhorn、Thomas J. Katz2003-08-22Chemistry of Materials
The structural properties of ten helicenebisquinones that have side chains differing in number and structure are analyzed by means of polarized light microscopy, differential thermal analysis, and X-ray diffraction. All the derivatives whose side chains are bonded to the helical cores by ether linkages assemble into h…
Liquid Crystal Research AdvancementsSurfactants and Colloidal SystemsMolecular spectroscopy and chirality
I. Rychetsk、S. Kamba、V. Porokhonskyy 等 9 位作者2003-08-22Journal of Physics Condensed Matter
Dielectric properties of the relaxor ferroelectric ceramics PLZT 8/65/35 and 9.5/65/35 were studied in the broad frequency range of 100 Hz–1 THz at low temperatures below the freezing temperature. Nearly frequency-independent dielectric losses were observed up to 1 GHz on cooling down to 10 K. Their magnitude decrease…
Ferroelectric and Piezoelectric MaterialsAcoustic Wave Resonator TechnologiesSolid-state spectroscopy and crystallography
L. C. Kretly、Ana Fabíola Leite Almeida、Ricardo Santos Oliveira 等 5 位作者2003-08-22Microwave and Optical Technology Letters
Abstract The solid‐state procedure is used to produce bulk ceramics of CCTO (CaCu 3 Ti 4 O 12 ). The samples of the CCTO ceramic are studied by X‐ray powder diffraction and infrared and Raman scattering spectroscopy. The infrared and Raman scattering spectroscopy confirm the formation of the CCTO phase, as seen by X‐r…
Ferroelectric and Piezoelectric MaterialsMicrowave Dielectric Ceramics SynthesisDielectric properties of ceramics
Sebastian von Alfthan、A. Kuronen、Kimmo Kaski2003-08-22Physical review. B, Condensed matter
The creation of realistic models of amorphous silica has been studied using the Monte Carlo based method of Wooten, Winer, and Weaire, where the bond-topology is optimized with respect to an interatomic potential model. The commonly used Keating potentials are compared and their strengths and weaknesses are assessed.…
High-pressure geophysics and materialsGlass properties and applicationsCrystal Structures and Properties
Ye Zhao、Jingguo Liu、Ya Zhou 等 7 位作者2003-08-22Journal of Physics Condensed Matter
In this letter we report the synthesis of nanostructures of molybdenum trioxides by directly oxidizing a spiral coil of molybdenum, at ambient atmosphere, by passing a current through the coil. The advantage of this approach is that the temperature of the substrate is low (normally below 200°C), and that the nanostruc…
ZnO doping and propertiesGas Sensing Nanomaterials and SensorsTransition Metal Oxide Nanomaterials
Tapan Kanti Paine、Eva Rentschler、Thomas Weyhermüller 等 4 位作者2003-08-22European Journal of Inorganic Chemistry
Abstract A family of bisphenol‐containing ligands with XO 2 donor atoms, where X = S, Se, or N, yields [Ni II ] 4 ( 1 ) and ( 2 ), [Ni II ] 5 ( 3 ), and [Ni II ] 6 ( 4 ) complexes. Complex 2 , 3 , and 4 have been structurally characterised by X‐ray diffraction. The compounds were characterised spectroscopically and by…
Metal complexes synthesis and propertiesMagnetism in coordination complexesMetal-Catalyzed Oxygenation Mechanisms
Li‐Ya Wang、Bin Zhao、Chenxi Zhang 等 6 位作者2003-08-22Inorganic Chemistry
The first azide(mu1,1)-bridged binuclear cobalt(II) complex with a chelated imino nitroxide radical, [Co2(immepy)2(N3)(4)].2EtOH, was structurally and magnetically characterized, where immepy = 4,4,5,5-tetramethyl-2-(6'-methyl-2'-pyridyl) imidazoline-1-oxyl. Five nitrogen atoms complete the coordination sphere of the…
Metal complexes synthesis and propertiesMagnetism in coordination complexesLanthanide and Transition Metal Complexes
Roman Boča、L'ubomír Dlháň、Gellert Mezei 等 6 位作者2003-08-22Inorganic Chemistry
Magnetic susceptibility and EPR studies show that trinuclear Cu(II)-pyrazolato complexes with a Cu(3)(mu3-X)2 core (X = Cl, Br) are ferromagnetically coupled: J(Cu-Cu) = +28.6 cm(-1) (X = Cl), +3.1 cm(-1) (X = Br). The orderly transition from an antiferromagnetic to a ferromagnetic exchange among the Cu centers of Cu(…
Metal-Organic Frameworks: Synthesis and ApplicationsMagnetism in coordination complexesLanthanide and Transition Metal Complexes
Gábor Romhány、J. Karger‐Kocsis、Tibor Czigány2003-08-22Macromolecular Materials and Engineering
Abstract Thermoplastic starch (MaterBi®) based composites containing flax fibers in unidirectional and crossed‐ply arrangements were produced by hot pressing using the film stacking method. The flax content was varied in three steps, viz. 20, 40 and 60 wt.‐%. Static tensile mechanical properties (stiffness and strengt…
Natural Fiber Reinforced Compositesbiodegradable polymer synthesis and propertiesElectrospun Nanofibers in Biomedical Applications
Shunai Che、Alfonso E. Garcia‐Bennett、Lanying Li 等 8 位作者2003-08-22Angewandte Chemie International Edition
A synthetic route to tubelike mesoporous carbon materials with a cubic structure has been developed by using propylsulfonic acid groups anchored onto a silica wall, which act as an acid catalyst for carbon-source polymerization. Pores with diameters of 2.4 and 4.0 nm were recorded for the carbon replicas obtained afte…
Mesoporous Materials and CatalysisPolyoxometalates: Synthesis and ApplicationsCovalent Organic Framework Applications
Changli Lü、Zhanchen Cui、Cheng Guan 等 6 位作者2003-08-22Macromolecular Materials and Engineering
Abstract Hybrid optical films of TiO 2 ‐triethoxysilane‐capped polythiourethane (TCPTU) with high refractive indices have been prepared via an in situ sol‐gel method. The high refractive index triethoxysilane‐capped polythiourethane (TCPTU) was synthesized by polyaddition of the triethoxysilane‐modified trimercaptothi…
Polymer composites and self-healingSynthesis and properties of polymersSilicone and Siloxane Chemistry
Biplab Sanyal、Lars Bergqvist、Olle Eriksson2003-08-22Physical review. B, Condensed matter
New materials are currently sought for use in spintronics applications. Ferromagnetic materials with half metallic properties are valuable in this respect. Here we present the electronic structure and magnetic properties of binary compounds consisting of $3d$ transition metals and group V elements, viz., P, Sb, and As…
Physics of Superconductivity and MagnetismZnO doping and propertiesHeusler alloys: electronic and magnetic properties
Thomas Kouyou Savage、Somesh Kr. Bhattacharya、Bindu Sadanadan 等 12 位作者2003-08-22Journal of Physics Condensed Matter
Photoinduced phenomena are of general interest for new materials. Recently, photoinduced molecular desorption of oxygen has been reported in carbon nanotubes. Here we present, using thermopower measurements, that carbon nanotubes when exposed simultaneously to UV light and oxygen exhibit photoinduced oxidation of the…
Carbon Nanotubes in CompositesPorphyrin and Phthalocyanine ChemistryTransition Metal Oxide Nanomaterials
Zdravko Kutnjak、Samo Kralj、G. Lahajnar 等 4 位作者2003-08-22Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
We present a calorimetric study of the phase behavior of octylcyanobiphenyl (8CB) liquid crystal confined to a controlled-pore glass (CPG). We used CPG matrices with characteristic void diameters ranging from 400 to 20 nm. In bulk we obtain weakly first-order isotropic to nematic (I-N) phase transition and nearly cont…
Liquid Crystal Research AdvancementsMaterial Dynamics and PropertiesSurfactants and Colloidal Systems
Jingbo Li、Wang2003-08-22Nano Letters
High-performance supercomputing and high-fidelity atomistic methods are used to study the shape effects on the single-particle electronic states of nanocrystals. We found that the shape can be used as an efficient way to control the electronic structures of the nanocrystals. Changing the shape is more flexible and pro…
Quantum Dots Synthesis And PropertiesChalcogenide Semiconductor Thin FilmsCopper-based nanomaterials and applications