Bozhi Tian、Lanying Li、Chengzhong Yu 等 8 位作者2002-04-30Chemical Communications
Organic templates of meso- and macro-porous siliceous materials can be completely removed within minutes by microwave digestion, resulting in highly ordered inorganic frameworks with higher surface areas, larger pore volumes, lower structural shrinkage and richer silanol groups compared with those from conventional te…
Zeolite Catalysis and SynthesisMesoporous Materials and CatalysisPolyoxometalates: Synthesis and Applications
Fernando Rojas、Isaac Kornhauser、Carlos Felipe 等 7 位作者2002-04-30Physical Chemistry Chemical Physics
Heterogeneous three-dimensional mesoporous networks (A. J. Ramírez-Cuesta, S. Cordero, F. Rojas, R. J. Faccio and J. L. Riccardo, J. Porous Mater., 2001, 8, 61, ) constructed under the premises of the dual site–bond model have been used as probe substrates to study the effects of variable connectivity and pore-size co…
Phase Equilibria and ThermodynamicsMesoporous Materials and CatalysisAerogels and thermal insulation
Pieter Rein ten Wolde、David Chandler2002-04-30OpenAlex
We have used computer simulation to study the collapse of a hydrophobic chain in water. We find that the mechanism of collapse is much like that of a first-order phase transition. The evaporation of water in the vicinity of the polymer provides the driving force for collapse, and the rate limiting step is the nucleati…
Protein Structure and DynamicsMaterial Dynamics and PropertiesRheology and Fluid Dynamics Studies
Dmitri V. Talapin、Andrey L. Rogach、Elena V. Shevchenko 等 6 位作者2002-04-30OpenAlex
The distribution of properties within ensembles of colloidally grown II-VI and III-V semiconductor nanocrystals was studied. A drastic difference in the photoluminescence efficiencies of size-selected fractions was observed for both organometallically prepared CdSe and InAs colloids and for CdTe nanocrystals synthesiz…
Gold and Silver Nanoparticles Synthesis and ApplicationsQuantum Dots Synthesis And PropertiesChalcogenide Semiconductor Thin Films
Haitao Ma、B. Wang、Q.‐Zh. Shi2002-04-29Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry
Six new complexes of the Schiff base ligand (HL) derived from benzoin and cysteine with Ln=La(III), Pr(III), Nd(III), Sm(III), Eu(III) and Gd(III) of the type LnLCl2(H2O)2 have been synthesized and characterized by elemental analyses, molar conductance, XPS, IR, thermal analysis, 1H NMR and electronic spectra.
Metal complexes synthesis and propertiesMagnetism in coordination complexesLanthanide and Transition Metal Complexes
Zdravko Kutnjak、R. Pirc、R. Blinc2002-04-29Applied Physics Letters
The third-order static field-cooled nonlinear dielectric permittivity in relaxor ferroelectric PbMg1/3Nb2/3O3 has been measured as a function of temperature. It is shown that the observed behavior can be explained by a mechanism of nonlinear response within the framework of the spherical random bond-random field model.
Ferroelectric and Piezoelectric MaterialsMultiferroics and related materialsAcoustic Wave Resonator Technologies
Nazmul Ahsan、Satoshi Sugahara、Masaaki Tanaka2002-04-29Applied Physics Letters
We have grown Mn δ-doped GaAs layers on GaAs(001) substrates by molecular beam epitaxy. Secondary ion mass spectroscopy and transmission electron microscopy revealed that Mn dopants were abruptly confined. The doping profiles still retained abruptness even at elevated growth temperature up to 400 °C. Mn δ-doped GaAs s…
ZnO doping and propertiesGaN-based semiconductor devices and materialsGa2O3 and related materials
X. R. Wang、Yupeng Wang、Z. Z. Sun2002-04-29Physical review. B, Condensed matter
For the ballistic quantum transport, the conductance of each channel is quantized to a value of ${2e}^{2}/h.$ In the presence of defects, electrons will be scattered such that the conductance will deviate from the values of the quantized conductance. We show that an antiresonance scattering can occur when an extra def…
Graphene research and applicationsQuantum and electron transport phenomenaAdvancements in Semiconductor Devices and Circuit Design
S. V. Halilov、David J. Singh、D. A. Papaconstantopoulos2002-04-29Physical review. B, Condensed matter
The electronic structure, selected phonon frequencies, and electron phonon coupling of the hexagonal layered compounds ${\mathrm{Nb}}_{2}\mathrm{CS},$ ${\mathrm{Nb}}_{2}\mathrm{CAs},$ and ${\mathrm{V}}_{2}\mathrm{CAs}$ are elucidated using density functional calculations. All materials are good three-dimensional metal…
Metal and Thin Film MechanicsIron-based superconductors researchMXene and MAX Phase Materials
Sun-Hwa Lee、Hyun M. Jang、Seong M. Cho 等 4 位作者2002-04-29Applied Physics Letters
Effects of the orientation of ferroelectric domains on the characteristics of polarized Raman spectra were studied using an epitaxially grown PbTiO3 thin film in which the c-axis oriented domains coexist with the a-axis oriented domains on MgO (001). To obtain polarized spectra for both two distinctive c and a domains…
Ferroelectric and Piezoelectric MaterialsPhotorefractive and Nonlinear OpticsAcoustic Wave Resonator Technologies
N. Ogawa、Kenjiro Miyano2002-04-29Applied Physics Letters
Switching and memory effects based on the deformation of the charge-density wave (CDW) in K0.3MoO3 are demonstrated. The deformations, which greatly affect the CDW dynamic phase transition from creep phase to slide phase, can be set by an external electric field and be removed by photoexcitation. This property can be…
Perovskite Materials and ApplicationsOrganic and Molecular Conductors ResearchSolid-state spectroscopy and crystallography
George Vazquez、Carlos G. Camara、Seth Putterman 等 4 位作者2002-04-29Physical Review Letters
The dynamical motion of sonoluminescing bubbles formed from a mixture of water and hydrogen gas indicates that these bubbles contain hydrogen. Their spectrum is well matched by an ideal 6000 K blackbody radiating from a surface with a radius less than 1/4 microm. According to this model, the state of matter inside the…
Ultrasound and Hyperthermia ApplicationsUltrasound and Cavitation PhenomenaPhotoacoustic and Ultrasonic Imaging
Qikai Li、San‐Qiang Shi2002-04-29Applied Physics Letters
It is commonly believed that dislocations cannot surmount the sound barrier at the shear wave velocity. This letter presents results of molecular dynamics simulation showing the contrary, namely that a stationary dislocation can be accelerated above the sound barrier provided that the theoretical shear strength is rea…
High-pressure geophysics and materialsFusion materials and technologiesNuclear Materials and Properties
Yuan Gao、Charalabos C. Doumanidis2002-04-29Journal of Manufacturing Science and Engineering
Ultrasonic bonding of thin foils has been recently introduced to rapid prototyping of complex-shaped and/or internally structured layered parts. This article provides the mechanical analysis of an elementary ultrasonic spot welding process of a metal foil on a previously deposited substrate. A 2-D, quasi-static/dynami…
Mechanical Behavior of CompositesAdvanced Welding Techniques AnalysisHigh-Velocity Impact and Material Behavior
C.H.P. Poa、S. Ravi P. Silva、Paul Watts 等 6 位作者2002-04-29Applied Physics Letters
Low threshold fields of 1.6 V/μm and 2.6 V/μm were obtained for field emission from multiwalled carbon nanotubes and boron-doped multiwalled carbon nanotubes embedded in polystyrene, respectively. A Fowler–Nordheim analysis of the results together with sheet resistivity data illustrate that the higher carbon nanotube…
Carbon Nanotubes in CompositesGraphene research and applicationsIon-surface interactions and analysis
Katsutoshi Hori、Sidik Marsudi、Hajime Unno2002-04-29Biotechnology and Bioengineering
The feasibility of the simultaneous production of polyhydroxyalkanoates (PHAs) and rhamnolipids, as a novel approach to reduce their production costs, was demonstrated by the cultivation of Pseudomonas aeruginosa IFO3924. Fairly large amounts of PHAs and rhamnolipids were obtained from the bacterial cells and the cult…
biodegradable polymer synthesis and propertiesMicroplastics and Plastic PollutionGraphene and Nanomaterials Applications
Jesper Lægsgaard2002-04-29Physical review. B, Condensed matter
A microscopic model for the incorporation of ${\mathrm{Er}}_{2}{\mathrm{O}}_{3}$ units in silica codoped with ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}$ is presented. The model assumes that Er clustering is counteracted by the formation of Er-Al complexes in which each Er ion provides valence compensation for three substitut…
Luminescence Properties of Advanced MaterialsGlass properties and applicationsCrystal Structures and Properties
W. Ren、S. F. Liu、Bhaskar Mukherjee2002-04-29Applied Physics Letters
Electric-field-induced phase transitions and piezoelectric properties of 〈001〉-oriented Pb(Zn1/3Nb2/3)O3–xPbTiO3 single crystals for x=4.5% and 8% (PZN–4.5%PT and PZN–8%PT) have been investigated as a function of temperature. It was found that the piezoelectric properties and phase transitions for both crystals are st…
Ferroelectric and Piezoelectric MaterialsAcoustic Wave Resonator TechnologiesMicrowave Dielectric Ceramics Synthesis
Jani Päiväsaari、Matti Putkonen、Lauri Niinistö2002-04-29Journal of Materials Chemistry
Thin films of cerium dioxide were deposited by atomic layer deposition (ALD). Temperature ranges studied in detail were 175–375 °C and 225–350 °C for the Ce(thd)4 and Ce(thd)3phen (thd = 2,2,6,6-tetramethyl-3,5-heptanedionate, phen = 1,10-phenanthroline) precursors, respectively. Ozone was used in both cases as oxygen…
Catalytic Processes in Materials ScienceSemiconductor materials and devicesElectronic and Structural Properties of Oxides
Takashi Yamamoto、Tsunehiro Tanaka、Ryoji Kuma 等 9 位作者2002-04-29Physical Chemistry Chemical Physics
NO reduction with CO in the presence of O2 was examined over various kinds of Al2O3-supported and Cu-based catalysts. The effects of loaded elements, supports and calcination temperatures on catalysis for the NO–CO–O2 reaction system were investigated. We found that the most effective catalyst was 0.5 wt.% Cu/γ-Al2O3…
Catalytic Processes in Materials ScienceCatalysis and Hydrodesulfurization StudiesCatalysis and Oxidation Reactions