Benecildo A. Riguetto、S. Damyanova、Gias Gouliev 等 6 位作者2004-04-01The Journal of Physical Chemistry B
The effects of the carrier and pretreatment temperature on the oxidation state of Ce and Pt were evaluated in Pt/Al 2 O 3, Pt/CeO 2, and Pt/CeO 2 −Al 2 O 3 catalyst samples with various CeO 2 loadings by applying the following spectroscopic techniques to the samples: X-ray diffraction (XRD), X-ray photoelectron spectr…
Catalytic Processes in Materials ScienceCatalysis and Hydrodesulfurization StudiesCatalysis and Oxidation Reactions
Abhijit Biswas、Oral Cenk Aktas、Ulrich Schürmann 等 7 位作者2004-04-01Applied Physics Letters
A method of vapor phase codeposition has been used at elevated target temperature coupled with selective masking technique to produce a multicomponent optical material with seven different ultraviolet-visible optical active planes. Such a system consists of different nanocomposites of Teflon AF/Ag, Teflon AF/Au, and T…
Gold and Silver Nanoparticles Synthesis and ApplicationsPlasmonic and Surface Plasmon ResearchNonlinear Optical Materials Studies
Li Shi、Qing Hao、Choongho Yu 等 6 位作者2004-04-01Applied Physics Letters
We have measured the thermal conductivities of a 53-nm-thick and a 64-nm-thick tin dioxide (SnO2) nanobelt using a microfabricated device in the temperature range of 80–350 K. The thermal conductivities of the nanobelts were found to be significantly lower than the bulk values, and agree with our calculation results u…
Advanced Thermoelectric Materials and DevicesThermal properties of materialsThermal Radiation and Cooling Technologies
Craig S. Kaplan、David Salesin2004-04-01ACM Transactions on Graphics
We present Najm , a set of tools built on the axioms of absolute geometry for exploring the design space of Islamic star patterns. Our approach makes use of a novel family of tilings, called "inflation tilings," which are particularly well suited as guides for creating star patterns. We describe a method for creating…
Computational Geometry and Mesh GenerationAdvanced Materials and MechanicsQuasicrystal Structures and Properties
M. Udovic、Matjaž Valant、Danilo Suvorov2004-04-01Journal of the American Ceramic Society
Solid‐state synthesis of compositions from the Bi 2 O 3 –TeO 2 system show that, under an oxygen atmosphere, Te 4+ oxidizes to Te 6+ and yields four room‐temperature stable compounds: Bi 2 Te 2 O 8 , Bi 2 TeO 6 , Bi 6 Te 2 O 15 , and new a compound with the nominal composition 7Bi 2 O 3 ·2TeO 2 . Dense ceramics can be…
Ferroelectric and Piezoelectric MaterialsCrystal Structures and PropertiesMicrowave Dielectric Ceramics Synthesis
Jongnam Park、Bonil Koo、Yosun Hwang 等 8 位作者2004-04-01Angewandte Chemie International Edition
The rod of iron rules! Magnetic iron phosphide (Fe2P) nanorods (see picture) were synthesized through the thermal decomposition of a mixture of [Fe(CO)5] and trioctylphosphane that was continuously supplied by using a syringe pump. The size of the nanorods can be successfully controlled by subtle changes in the experi…
Advancements in Battery MaterialsZnO doping and propertiesQuantum Dots Synthesis And Properties
Young Hoon Yeom、Bin Wen、Wolfgang M.H. Sachtler 等 4 位作者2004-04-01The Journal of Physical Chemistry B
The reactions of acetaldehyde, acetic acid, and nitromethane with NO 2 on a BaNa−Y zeolite are monitored with FTIR spectroscopy, typically at 473 K. Isotopic labeling was used to help elucidate reaction pathways and intermediates. The mechanism that has been deduced for the reaction of NO 2 with acetaldehyde starts wi…
Advanced Chemical Physics StudiesCatalytic Processes in Materials ScienceCatalysis and Oxidation Reactions
Nguyen Hoa Hong、Joe Sakai、Awatef Hassini2004-04-01Applied Physics Letters
V-doped TiO2 thin films were grown by laser ablation on LaAlO3 substrates. In the chosen range of the growth conditions, all V:TiO2 films have an anatase structure and exhibit semiconducting and ferromagnetic behaviors at room temperature. V:TiO2 films have a giant magnetic moment and they seem to be far better ferrom…
ZnO doping and propertiesGas Sensing Nanomaterials and SensorsElectronic and Structural Properties of Oxides
Xi Chen、Nan Wu、L. Smith 等 4 位作者2004-04-01Applied Physics Letters
A micro thin-film solid oxide fuel cell (TFSOFC) has been designed based on thin-film deposition and microlithographic processes. The TFSOFC is composed of a thin-film electrolyte grown on a nickel foil substrate and a thin-film cathode deposited on the electrolyte. The Ni foil substrate is then processed into a porou…
Advancements in Solid Oxide Fuel CellsCatalysis and Oxidation ReactionsElectronic and Structural Properties of Oxides
Chen‐Ming Hsu、S. Shivkumar2004-04-01Macromolecular Materials and Engineering
Abstract Summary: Additives that exhibit polyelectrolyte behavior such as N , N ‐dimethylformamide (DMF) may improve the electrospinning characteristics of viscoelastic polymer solutions. DMF additions to the solution lead to extensive jet splaying, thereby reducing the fiber diameter significantly. Nanofibrous struct…
Surface Modification and SuperhydrophobicityAdvanced Sensor and Energy Harvesting MaterialsElectrospun Nanofibers in Biomedical Applications
P. M. Martineau、Simon C. Lawson、Andy Taylor 等 6 位作者2004-04-01Gems & Gemology
Studies carried out at the DTC Research Centre have shown that single-crystal CVD synthetic diamond is clearly distinguishable from natural diamond. This article presents information about the CVD process, the history of its development, the different kinds of CVD synthetic diamond material that can be produced, and p…
Geological and Geochemical AnalysisHigh-pressure geophysics and materialsDiamond and Carbon-based Materials Research
Y. C. Wang、Jun Ding、Jiabao Yi 等 6 位作者2004-04-01Applied Physics Letters
Co-ferrite films were deposited on SiO2 single-crystal substrates. The as-deposited films were amorphous. The crystallization required an annealing at 700 °C or higher. Magnetic properties were found to be strongly dependent on annealing temperature, annealing duration, and film thickness. A small film thickness can r…
Magnetic properties of thin filmsMagnetic Properties and Synthesis of FerritesElectromagnetic wave absorption materials
R. J. Harrison、Simon A. T. Redfern、Ekhard K. H. Salje2004-04-01Physical Review B
The ferroelastic domain processes responsible for low-frequency anelasticity in ${\mathrm{LaAlO}}_{3}$ have been investigated using dynamical mechanical analysis in three-point bend geometry combined with in situ optical observations under dynamic stress at high temperature. Transformations in the types of collective…
Ferroelectric and Piezoelectric MaterialsAcoustic Wave Resonator TechnologiesSolid-state spectroscopy and crystallography
Nikolaos K. Lazaridis、T. A. Pandi、K. A. Matis2004-04-01Industrial & Engineering Chemistry Research
In this study, the sorptive removal of hexavalent chromium from aqueous solutions by Mg−Al−CO 3 hydrotalcite was investigated in a batch mode. The influence of solution pH, conditioning duration, initial chromium concentration, sorbent concentration, sorbent particle size, and temperature was tested at sorption kineti…
Adsorption and biosorption for pollutant removalLayered Double Hydroxides Synthesis and ApplicationsPhosphorus and nutrient management
Patricia Concepción、Avelino Corma、Joaquín Silvestre‐Albero 等 5 位作者2004-04-01Journal of the American Chemical Society
Pt on mesostructured CeO(2) nanoparticles embedded within ultrathin layers of highly structured SiO(2) binder shows highest activity reported with 80% selectivity for the chemoselective hydrogenation of crotonaldehyde. Characterization by transmission electron microscopy (TEM), CO adsorption, and X-ray photoelectron s…
Electrocatalysts for Energy ConversionCatalytic Processes in Materials ScienceCatalysis and Hydrodesulfurization Studies
Yong-Il Kwon、Li Y、Young-Woo Heo 等 8 位作者2004-04-01Applied Physics Letters
We report on enhancement-mode ZnO-based field-effect transistors that utilize an acceptor-doped channel. In particular, the active channel is polycrystalline ZnO doped with Mg, to increase the band gap, and P, to decrease the electron carrier concentration. Devices are realized that display an on/off ratio of 103 and…
ZnO doping and propertiesSemiconductor materials and devicesElectronic and Structural Properties of Oxides
Michio Iwaoka、Hiroto Komatsu、Takayuki Katsuda 等 4 位作者2004-04-01Journal of the American Chemical Society
To investigate the nature of nonbonded Se...O interactions, three series of 2-substituted benzeneselenenyl derivatives [2-(CHO)C6H4SeX (1), 2-(CH2OH)C6H4SeX, (2), 2-(CH2OiPr)C6H4SeX (3); X = Cl, Br, CN, SPh, SeAr, Me] were synthesized. The 17O NMR absorption observed for 17O-enriched aldehydes 1 appeared upfield relat…
Solid-state spectroscopy and crystallographyOrganoselenium and organotellurium chemistryBiochemical effects in animals
Michel Lefrançois2004-04-01Sealing Technology
Process developments over the past 30 years, demanding ultrahigh vacuum, high temperatures and high pressures, have driven the need for advanced technology seals. This article explains how metal-to-metal gaskets have evolved to comply with the most demanding requirements and provide both resilience and low assembly fo…
Advanced materials and compositesMetal Alloys Wear and PropertiesPowder Metallurgy Techniques and Materials
von Seggern Elke2004-04-01Applied Rheology
Richtering Walter2004-04-01Applied Rheology