Biprajit Sarkar、Wolfgang Kaim、Axel Klein 等 7 位作者2003-09-09Inorganic Chemistry
The Ru(2)(III,II) mixed-valent state is strongly stabilized in [(bpy)(2)Ru(mu-bttz)Ru(bpy)(2)](5+) (3(5+), bttz = 3,6-bis(2-thienyl)-1,2,4,5-tetrazine, as evident from lowered oxidation potentials and isolability, a strongly increased comproportionation constant K(c) = 10(16.6), and a high-energy intervalence charge t…
Metal complexes synthesis and propertiesMagnetism in coordination complexesLanthanide and Transition Metal Complexes
A. Varada Rajulu、Ying Meng、X. H. Li 等 7 位作者2003-09-09Journal of Applied Polymer Science
Abstract The uniaxial natural fabric from the tree Hildegardia populifolia was treated with 5% aqueous NaOH solution for 0, 2, 4, 6, and 8 h, and the resulting changes were analyzed by density, Fourier infrared spectroscopic, X‐ray, polarized microscopic, and scanning electron microscopic techniques. On alkali treatme…
Natural Fiber Reinforced CompositesAdvanced Cellulose Research StudiesLignin and Wood Chemistry
Nicolás Giovambattista、H. Eugene Stanley、Francesco Sciortino2003-09-09Physical Review Letters
We study the potential energy landscape explored during a compression-decompression cycle for the simple point charge extended model of water. During the cycle, the system changes from low density amorphous (LDA) ice to high density amorphous ice. After the cycle, the system does not return to the same region of the l…
Phase Equilibria and ThermodynamicsMaterial Dynamics and PropertiesThermodynamic properties of mixtures
Osvaldo Pino-García、Åke C. Rasmuson2003-09-09Industrial & Engineering Chemistry Research
A novel multicell apparatus is designed, constructed, and used to investigate crystal nucleation of vanillin in water/2-propanol solution (20 mass % of 2-propanol on a solute-free basis). The device contains 15 nucleation cells, with volumes of about 6 cm 3 each, in which the induction times for nucleation are measure…
Crystallization and Solubility StudiesChemical and Physical Properties in Aqueous SolutionsBiochemical and biochemical processes
Marcin Stępień、Lechosław Latos‐Grażyński2003-09-09Inorganic Chemistry
Coordinating properties of acetoxybenziporphyrin, (TPBPOAc)H, have been investigated for a number of metal ions. Insertion of Ni, Pd, and Fe results in the cleavage of the acetoxy group leading to complexes (TPBPO)Ni(II), (TPBPO)Pd(II), and (TPBPO)Fe(III)X containing a M-O bond. No cleavage is observed with Zn(II) and…
Molecular Sensors and Ion DetectionPorphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation Mechanisms
Heidi Grön、Patricia Mougin、Alistair Thomas 等 8 位作者2003-09-09Industrial & Engineering Chemistry Research
The use of in-process analytical techniques to give direct access to the processing parameters needed for the optimization of crystallization processes for new materials and to achieve process robustness for existing processes is presented. An integrated 2-L batch crystallization system incorporating advanced in-proce…
Analytical Chemistry and ChromatographyCalcium Carbonate Crystallization and InhibitionCrystallization and Solubility Studies
Jacqueline Dalby‐Payne、Edward V. O’Loughlin、Peter W. Gunning2003-09-09Molecular Biology of the Cell
Microfilaments have been reported to be polarized in a number of cell types based both on function and isoform composition. There is evidence that microfilaments are involved in the movement of vesicles and the polarized delivery of proteins to specialized membrane domains. We have investigated the composition of acti…
Cystic Fibrosis Research AdvancesPolymer Surface Interaction StudiesSkin and Cellular Biology Research
Francesca Cavalieri、F. Padella、Franco Cataldo2003-09-09Journal of Applied Polymer Science
Abstract Cured rubber powder was successfully devulcanized under the application of high‐energy ball milling. An attempt was made to improve the efficiency of devulcanization with a phenolic antioxidant (2,6‐di‐ tert ‐butyl‐4‐methyl‐phenol). In addition, the grafting of virgin natural rubber to the surface of rubber p…
Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesPolymer composites and self-healing
George Maroulis、Claude Pouchan2003-09-09The Journal of Physical Chemistry B
We report conventional ab initio and B3LYP/DFT calculations for the static electric (hyper)polarizability of small CdS clusters. Our results indicate a strong reduction of the (per atom) mean dipole polarizability with size, supporting the recent LDA findings by Troparevsky and Chelicowsky [ J. Chem. Phys . 2001, 114,…
Advanced Chemical Physics StudiesQuantum Dots Synthesis And PropertiesChalcogenide Semiconductor Thin Films
Qingxuan Li、Xingzhong Fang、Zhen Wang 等 5 位作者2003-09-09Journal of Polymer Science Part A Polymer Chemistry
Abstract 2,2′,3,3′‐Oxydiphthalic dianhydride (2,2′,3,3′‐ODPA) and 2,3,3′,4′‐ODPA were synthesized from 3‐chlorophthalic anhydride with 2,3‐xylenol and 3,4‐xylenol, respectively. Their structures were determined via single‐crystal X‐ray diffraction. A series of polyimides derived from isomeric ODPAs with several diamin…
Epoxy Resin Curing ProcessesSynthesis and properties of polymersSilicone and Siloxane Chemistry
T. Graf、Sebastian T. B. Goennenwein、Martin S. Brandt2003-09-09physica status solidi (b)
Abstract Theoretical predictions of room‐temperature ferromagnetism in Mn‐doped GaN and other wide band gap semiconductors suggest that these materials might be useful for spintronic applications. In this short review, we summarize recent observations on the gap states of GaN:Mn, which make it impossible that the two…
ZnO doping and propertiesGaN-based semiconductor devices and materialsGa2O3 and related materials
Philippe Lalanne、Christophe Sauvan、Jean‐Paul Hugonin 等 5 位作者2003-09-09Physical review. B, Condensed matter
A perturbative approach for surface-plasmon-related effects encountered in metallo dielectric interfaces that incorporate periodic subwavelength defects with arbitrary shapes or materials is presented. It provides a simple insight into the physics of some important optical properties of these interfaces. We apply this…
Plasmonic and Surface Plasmon ResearchPhotonic Crystals and ApplicationsOptical Coatings and Gratings
Sagar B. Gadewar、Herbert M. Hofmann、Michael F. Doherty2003-09-09Crystal Growth & Design
We have developed a mathematical model to track facets appearing and disappearing during the evolution of crystal shape. The model also gives the crystal shape at steady state that is consistent with the predictions from the Wulff-Chernov approach (Chernov, A. A. Sov. Phys. Crystallogr. 1963, 7, 728). We show that und…
Enzyme Structure and FunctionCalcium Carbonate Crystallization and InhibitionCrystallization and Solubility Studies
K. Zahn、G. Maret、Carsten Ruß 等 4 位作者2003-09-09Physical Review Letters
We use videomicroscopy to follow the phase-space trajectory of a two-dimensional colloidal model liquid and calculate three-point correlation functions from the measured particle configurations. Approaching the fluid-solid transition by increasing the strength of the pair-interaction potential, one observes the gradua…
Material Dynamics and PropertiesComplex Systems and Time Series AnalysisEcosystem dynamics and resilience
A. De Gusseme、Laurent Carpentier、Jean‐François Willart 等 4 位作者2003-09-09The Journal of Physical Chemistry B
The molecular mobility of amorphous anhydrous trehalose (C 12 H 22 O 11 ) was investigated by means of temperature-modulated differential scanning calorimetry (TMDSC) and dielectric analysis (DEA). TMDSC was used to perform a specific heat spectroscopy, which appeared essential, as dielectric measurements above T g we…
Material Dynamics and PropertiesMicroencapsulation and Drying ProcessesBiofield Effects and Biophysics
Elisabeth Groß、D. Kovalev、N. Künzner 等 7 位作者2003-09-09Physical review. B, Condensed matter
We report on a spectroscopic study of electronic energy transfer from excitons confined in silicon nanocrystals to triplet ground-state oxygen molecules, being either physisorbed on the nanocrystal surface or present in the gas phase. The broad photoluminescence spectrum of the nanocrystal assembly probes the transfer…
Semiconductor materials and devicesThin-Film Transistor TechnologiesSilicon Nanostructures and Photoluminescence
Jae Youn Lee、Zhenyu Shou、Anna C. Balazs2003-09-09Macromolecules
To isolate the factors that control the structure of nanocomposite thin films, we develop a computational model and scaling theory to investigate the behavior of diblock/nanoparticle mixtures that are confined between two hard walls. We find that in such restricted geometries a polymer-induced depletion attraction dri…
Advanced Polymer Synthesis and CharacterizationPolymer Surface Interaction StudiesBlock Copolymer Self-Assembly
Wanlin Guo、Yufeng Guo2003-09-09Physical Review Letters
An exceptionally large axial electrostrictive deformation is demonstrated in single walled carbon nanotubes using Hartree-Fock and density functional quantum mechanics simulations. Armchair and zigzag open-ended tubes and capped tubes are studied and in all of them the external electric field induced axial strains can…
Carbon Nanotubes in CompositesFerroelectric and Piezoelectric MaterialsDielectric materials and actuators
Jérémie Brunel、Olivier Mongin、Anny Jutand 等 6 位作者2003-09-09Chemistry of Materials
Nanoscale propeller-shaped conjugated molecules based on a central triphenylbenzene core bearing three oligomeric phenylene−vinylene branches having either electron-donating or electron-withdrawing peripheral groups have been synthesized. These octupolar derivatives show definite solvatochromic behavior (in absorption…
Nonlinear Optical Materials ResearchPhotochromic and Fluorescence ChemistryNonlinear Optical Materials Studies
Iker Zuriguel、Luis A. Pugnaloni、Ángel Garcimartín 等 4 位作者2003-09-09Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
We have looked into an experiment that has been termed the "canonical example" of jamming: granular material, clogging the outlet of a container as it is discharged by gravity. We present quantitative data of such an experiment. The experimental control parameter is the ratio between the radius of the orifice and the…
Material Dynamics and PropertiesTheoretical and Computational PhysicsGranular flow and fluidized beds