Ali Çırpan、Avni A. Argun、Christophe R. G. Grenier 等 5 位作者2003-01-01Journal of Materials Chemistry
Reflective and absorptive/transmissive polymer electrochromic devices (ECDs) composed of spray-coated films of poly(3,3-bis(octadecyloxymethyl)-3,4-dihydro-2H-thieno[3,4-b][1,4]dioxepine) (PProDOT(CH2OC18H37)2) and poly(3,3-bis(2-ethylhexyloxymethyl)-3,4-dihydro-2H-thieno[3,4-b][1,4]dioxepine) (PProDOT(CH2OEtHx)2) lay…
Analytical Chemistry and SensorsTransition Metal Oxide NanomaterialsConducting polymers and applications
Shaoming Dong、Yutai Katoh、Akira Kohyama2003-01-01Journal of the American Ceramic Society
The development of advanced Tyranno SA SiC fiber with a near‐stoichiometric composition and a well‐crystallized microstructure has made it possible to prepare SiC/SiC composites even under harsh conditions. To assess the reinforcing effectiveness of Tyranno SA fiber at high temperature under pressure, unidirectional S…
Fiber-reinforced polymer compositesAdvanced materials and compositesAdvanced ceramic materials synthesis
A. Srinivasan、Tomoya Ishizuka、Atsuhiro Osuka 等 4 位作者2003-01-01Journal of the American Chemical Society
Meso-hexakis(pentafluorophenyl)-substituted doubly N-confused hexaphyrins and their metal complexes were synthesized for the first time, and the structures were elucidated by X-ray single-crystal analyses. The free base form of oxidized hexaphyrin (5) had two preorganized N3O pockets in the macrocyclic core, where a h…
Metal-Catalyzed Oxygenation MechanismsPorphyrin and Phthalocyanine ChemistryPhotosynthetic Processes and Mechanisms
Carlos Baleizão、Bárbara Gigante、Debasish Das 等 6 位作者2003-01-01Chemical Communications
A chiral vanadyl salen complex having two peripheral trimethoxysilyl groups has been used to obtain a chiral periodic mesoporous organosilica having MCM-41 periodicity and the two Si-CH2 groups anchored on the framework; this solid induces 30% enantioselectivity in the cyanosilylation of benzaldehyde.
Zeolite Catalysis and SynthesisPolyoxometalates: Synthesis and ApplicationsMesoporous Materials and Catalysis
R.E. Williford、L.A. Chick、G.D. Maupin 等 5 位作者2003-01-01Journal of The Electrochemical Society
Concentration polarization is important because it determines the maximum power output of a solid oxide fuel cell (SOFC) at high fuel utilization. Anodic concentration polarization occurs when the demand for reactants exceeds the capacity of the porous cermet anode to supply them by gas diffusion mechanisms. High tort…
Advancements in Solid Oxide Fuel CellsElectrocatalysts for Energy ConversionFuel Cells and Related Materials
Carlo Lamberti、Silvia Bordiga、Francesca Bonino 等 9 位作者2003-01-01Physical Chemistry Chemical Physics
The use of XANES spectroscopy, both in classical and in dispersive geometries, is illustrated for the study of copper-based catalysts under in situ or in operando conditions. As case studies, copper-exchanged MFI zeolites and CuCl2/γ-Al2O3 systems are considered. In the former case, in situ XANES spectroscopy was used…
Catalytic Processes in Materials ScienceCatalysis and Oxidation ReactionsAnalytical chemistry methods development
Hisataka Kobayashi、Martin W. Brechbiel2003-01-01Molecular Imaging
Numerous macromolecular MRI contrast agents prepared employing relatively simple chemistry may be readily available that can provide sufficient enhancement for multiple applications. These agents operate using a approximately 100-fold lower concentration of gadolinium ions in comparison to the necessary concentration…
Lanthanide and Transition Metal ComplexesNanoparticle-Based Drug DeliveryDendrimers and Hyperbranched Polymers
N. D. Mathur、P. B. Littlewood2003-01-01Physics Today
From atom-scale stripes to micron-scale patches, manganites exhibit a wealth of fascinating phase-separated behavior.
Magnetic and transport properties of perovskites and related materialsShape Memory Alloy TransformationsElectronic and Structural Properties of Oxides
Haichao Liu、Patricia Cheung、Enrique Iglesia2003-01-01Physical Chemistry Chemical Physics
Dispersed two-dimensional MoOx and VOx oligomers on Al2O3 and SnOx-modified Al2O3 supports were examined for selective dimethyl ether (DME) oxidation to HCHO and their structure and reduction rates in H2 were determined using Raman and X-ray near edge absorption spectroscopies (XANES), respectively. Modifying Al2O3 su…
Catalytic Processes in Materials ScienceTransition Metal Oxide NanomaterialsCatalysis and Oxidation Reactions
Santos Flávio de Paula、Campos Elson de、Costa Marcelo 等 6 位作者2003-01-01Materials Research
The properties of hydrophilicity or hydrophobicity of materials are defined mainly, though not exclusively, by their composition, morphology and surface energy. In this work, titanium dioxide (TiO2) and aluminum oxide-alumina (Al2O3) ceramics prepared by uniaxial pressing were studied in terms of surface energy. The s…
C.G. Rodrigues、Valder N. Freire、Áurea R. Vasconcellos 等 4 位作者2003-01-01Materials Research
A study of the mobility of n-doped wurtzite III-Nitrides is reported. We have determined the nonequilibrium thermodynamic state of the III-Nitrides systems driven far away from equilibrium by a strong electric field in the steady state, which follows after a very fast transient. The dependence of the mobility (which d…
Adriana F. Azevedo、E.J. Corat、N. F. Leite 等 5 位作者2003-01-01Materials Research
The stress evolution in diamond films grown on Ti6Al4V was investigated in order to develop a comprehensive view of the residual stress formation. Residual stress is composed of intrinsic stress induced during diamond film growth and extrinsic stress caused by the different thermal expansion coefficients between the f…
Metal and Thin Film MechanicsAdvanced materials and compositesDiamond and Carbon-based Materials Research
A.C. de Oliveira、J.A. Freitas Jr.、W.J. Moore 等 13 位作者2003-01-01Materials Research
Calculations of the total dielectric functions and the optical bandgap energy (OBGE) of 4HSiC were performed by the full-potential linear muffin-tin-orbital method. The results are compared to spectroscopic ellipsometry dielectric measurements agreeing closely over in a wide range of energies. The obtained theoretical…
A.V. Diniz、N.G. Ferreira、E.J. Corat 等 4 位作者2003-01-01Materials Research
Boron doped diamond thin films were grown on titanium alloy substrates (Ti6Al4V) with 36 × 35 × 1.3 mm at 873-933 K at 6.5 × 10³ Pa during 8 h by hot filament CVD assisted technique. The boron source was obtained from a H2 line forced to pass through a bubbler containing B2O3 dissolved in methanol (B\C = 6000 ppm). Th…
Diamond and Carbon-based Materials ResearchForce Microscopy Techniques and ApplicationsSemiconductor materials and devices
Etsuo Hamada, Masayasu Nagoshi, Kaoru Sato, Akira Matsuzaki, Takafumi Yamaji and Kotaro Kuroda2003-01-01Science and Technology of Advanced Materials
Chromate coatings on Zn or Zn alloy coated steel sheets often include silica for the aim to improve corrosion resistance. In the case of dry-in-place chromate coatings containing acrylic resin (hereafter referred to as an organic–inorganic composite coating), an addition of silica, however, did not show an improvement…
Lanfredi Silvania、Nobre Marcos A. de Lima2003-01-01Materials Research
The electric and dielectric properties of Bi3Zn2Sb3O14 ceramic were studied by impedance spectroscopy. The measurements were performed in the frequency range 5 to 13 MHz and at temperature ranges from 25 to 700 degreesC. The permittivity was calculated by the variation of the imaginary part of the impedance (-Im(Z)) a…
Kestenbach H.-J.、Rogausch K.-D.2003-01-01Materials Research
Polarized light microscopy was used to investigate the presence of preferred molecular orientation in the LCP phase of PPS/LCP blends after injection moulding. Normal birefringence effects appeared to be complicated by artifacts due to sample preparation and by the complex nature of polarized light transmission throug…
V. Lemos、D. Silva、C.A. Luengo 等 5 位作者2003-01-01Materials Research
Single-wall carbon nanotubes were produced with, either, a bimetallic or a mixture of three catalysts. Raman scattering and high resolution transmission electron microscopy were used as characterization tools. The mixture LiNi0.5Co0.5O2 leaded to a sample relatively free from impurities with long bundles, each contain…
Santiago Diego、Lombera Guillermo、Urquiza Santiago 等 4 位作者2003-01-01Materials Research
A mathematical pultrusion model of a thermosetting matrix composite is presented. The energy balance was solved by Finite Elements techniques using a program developed for this purpose. This model is applied to describe the temperature and resin conversion profiles along the die. This study was developed considering d…
A.C. de Oliveira、J.A. Freitas Jr.、W.J. Moore 等 10 位作者2003-01-01Materials Research
The optical bandgap energies (OBGE) of 3C, 15R, 6H and 4H-SiC have been investigate experimentally by transmission and photoacoustic spectroscopies. The measurements were performed on 470 mum thick wafers. The OBGE obtained from both spectroscopies for different polytypes show very good agreement. In order to have a b…