Tooru Kitagawa、Kohji Tashiro、Kazuyuki Yabuki2002-05-07Journal of Polymer Science Part B Polymer Physics
Abstract To clarify the relationship between a molecular deformation mechanism and a high Young's modulus of poly‐ p ‐phenylenebenzobisoxazole (PBO), Raman spectra were measured for fibers subjected to a tensile stress along the chain axis. The stress‐induced frequency shift of the observed Raman bands could be reprod…
Nonlinear Optical Materials ResearchConducting polymers and applicationsFiber-reinforced polymer composites
J. A. Barbero、M. C. Alvarez、Miguel Á. Bañares 等 5 位作者2002-05-07Chemical Communications
The partial oxidation of methane to CH3OH and HCHO (C1-oxygenates) was evaluated over a low surface area V2O5/SiO2 catalyst. The introduction of low amounts of NO (0-2.92% vol) to the reaction feed strongly enhanced both the conversion of methane and selectivity to C1-oxygenates. In the presence of NO, both the reacti…
Industrial Gas Emission ControlCatalytic Processes in Materials ScienceCatalysis and Oxidation Reactions
Mingxiao Fu、Gaoquan Shi、Fengen Chen 等 4 位作者2002-05-07Physical Chemistry Chemical Physics
Polythiophene (Pth) films have been electrochemically deposited on mirror-like stainless steel (SS) (or gold) electrode surfaces by direct oxidation of thiophene in boron trifluoride diethyl etherate (BFEE) solutions at a constant applied potential of 1.3 V (vs. Ag/AgCl). The Raman spectra of Pth films have been inves…
Organic Electronics and PhotovoltaicsElectrochemical Analysis and ApplicationsConducting polymers and applications
Martin Hartmann、Ajayan Vinu、S.P. Elangovan 等 5 位作者2002-05-07Chemical Communications
The direct synthesis of the new mesoporous molecular sieve AlSBA-1 containing exclusively tetrahedrally coordinated aluminium and the catalytic activity of the novel material in the isomerization of n-decane are reported.
Zeolite Catalysis and SynthesisMesoporous Materials and CatalysisCatalytic Processes in Materials Science
Mohamed B. Sied、J. Salud、D. Ó. López 等 5 位作者2002-05-07Physical Chemistry Chemical Physics
Modulated differential scanning calorimetry (MDSC) has been used to obtain specific heat measurements on octyloxycyanobiphenyl (8OCB), octylcyanobiphenyl (8CB) and nonyloxycyanobiphenyl (9OCB) liquid crystals and on several binary mixtures of 8OCB + 9OCB and 8CB + 9OCB. The order of the mesophase transitions, smectic…
Liquid Crystal Research AdvancementsNonlinear Dynamics and Pattern FormationMolecular spectroscopy and chirality
Jörg Enderlein2002-05-07Physical Chemistry Chemical Physics
The electrodynamics of a fluorescing molecule (an electric dipole emitter) within a spherical metallic nanocavity is studied. It is shown that, for a favorable cavity size, the fluorescence properties such as fluorescence emission rate or photostability are strongly enhanced. This is caused by two effects: the enhance…
Gold and Silver Nanoparticles Synthesis and ApplicationsQuantum Information and CryptographyPlasmonic and Surface Plasmon Research
Fengkui Li、Richard C. Larock2002-05-07Polymers for Advanced Technologies
Abstract New polymeric materials have been prepared by the cationic copolymerization of regular soybean oil, low saturation soybean oil, i.e. LoSatSoy oil, or conjugated LoSatSoy oil with styrene and divinylbenzene, norbornadiene or dicyclopentadiene initiated by boron trifluoride diethyl etherate ( BF 3 · OEt 2 ) or…
Polymer Nanocomposites and PropertiesPolymer composites and self-healingEpoxy Resin Curing Processes
Sung‐Seen Choi2002-05-07Polymers for Advanced Technologies
Abstract Formation of bound rubber is affected by the physical structure and surface chemistry of filler and the property of rubber. Variation of the bound rubber formation in styrene‐butadiene rubber compounds filled with silica and/or carbon black was studied. Influence of temperature on extraction of loosely bound…
Cultural Heritage Materials AnalysisPolymer Nanocomposites and PropertiesSilicone and Siloxane Chemistry
Youngjo Kim、John G. Verkade2002-05-07Organometallics
The new titanatranes (Ar = 2,6-di- i -Pr-phenoxy; Ar‘ = 2,4-di-MeC 6 H 2; x = 0, 5; x = 1, 6; x = 2, 7; x = 3, 8 ) featuring three six-membered chelating rings ( 5 ) to three five-membered chelating rings ( 8 ) in a stepwise fashion through 6 and 7 were synthesized from the corresponding trihydroxy chelating ligands 1…
Carbon dioxide utilization in catalysisOrganometallic Complex Synthesis and Catalysisbiodegradable polymer synthesis and properties
J. G. Rodrigo、A. Garcia-Martin、J. J. Saenz 等 4 位作者2002-05-07arXiv
Electronic transport properties of bismuth nanocontacts are analyzed by means of a low temperature scanning tunneling microscope. The subquantum steps observed in the conductance versus elongation curves give evidence of atomic rearrangements in the contact. The underlying quantum nature of the conductance reveals its…
Mesoscale and Nanoscale PhysicsMaterials Science
Felipe Barra、Anders Levermann、Itamar Procaccia2002-05-07arXiv
The method of iterated conformal maps is developed for quasi-static fracture of brittle materials, for all modes of fracture. Previous theory, that was relevant for mode III only, is extended here to mode I and II. The latter require solution of the bi-Laplace rather than the Laplace equation. For all cases we can con…
Materials Sciencenlin.PScond-mat.stat-mech
G. M. Buendia、S. J. Mitchell、P. A. Rikvold2002-05-07arXiv
We propose and study a simplified model for the surface and bulk structures of crosslinked polymer gels, into which voids are introduced through templating by surfactant micelles. Such systems were recently studied by Atomic Force Microscopy [M. Chakrapani et al., e-print cond-mat/0112255]. The gel is represented by a…
Chemical PhysicsSoft Condensed Mattercond-mat.stat-mechMaterials Science
J. Christiansen、K. Morgenstern、J. Schiøtz 等 8 位作者2002-05-07arXiv
The intersection between dislocations and a Ag(111) surface has been studied using an interplay of scanning tunneling microscopy (STM) and molecular dynamics (MD). Whereas the STM provides atomically resolved information about the surface structure and Burgers vectors of the dislocations, the simulations can be used t…
Materials Science
Alessio Filippetti、Nicola A. Hill2002-05-07Physical review. B, Condensed matter
We present a first-principles comparison of ${\mathrm{BaTiO}}_{3},{\mathrm{CaMnO}}_{3},$ and ${\mathrm{YMnO}}_{3}$ which reveals the fundamental role of the d electron occupation in preventing or favoring the simultaneous presence of magnetic and electric polarization. The ferroelectric compounds are distinguished fro…
Magnetic and transport properties of perovskites and related materialsMultiferroics and related materialsFerroelectric and Piezoelectric Materials
A. A. Louis2002-05-07arXiv
Density (or state) dependent pair potentials arise naturally from coarse-graining procedures in many areas of condensed matter science. However, correctly using them to calculate physical properties of interest is subtle and cannot be uncoupled from the route by which they were derived. Furthermore, there is usually n…
Materials ScienceSoft Condensed Matter
O. A. Yeshchenko、M. M. Biliy、Z. Z. Yanchuk2002-05-07arXiv
Excitonic absorption, reflection and photoluminescence spectra of mixed Zn(P_{1-x}As_{x})_{2}crystals over the full range of x (0 < x < 1) and Zn_{1-x}Cd_{x}P_{2} crystals at 0 < x < 0.05 have been studied at low temperatures (1.8 K). The decrease of the energy gap in Zn(P_{1-x}As_{x})_{2} at the increase of x occurs…
Materials Science
Joseph P. Heremans、C. M. Thrush、Donald T. Morelli 等 4 位作者2002-05-07OpenAlex
Because of the increase in the electronic density of states in low-dimensional systems, semiconductor quantum wires constitute a most promising thermoelectric material. We report here the first experimental observation of a very large enhancement of the thermoelectric power of composites containing bismuth nanowires w…
Advanced Thermoelectric Materials and DevicesThermal properties of materialsThermal Radiation and Cooling Technologies
Bin Ding、Hak Yong Kim、Se‐Chul Lee 等 8 位作者2002-05-07OpenAlex
Abstract Nanoscale poly(vinyl alcohol) (PVA) fiber (100–500 nm) aggregates were prepared with an electrospinning technique. Additionally, a chemical crosslinking method was used to crosslink the nanoscale PVA fiber aggregates. Differential scanning calorimetry, wide‐angle X‐ray diffraction, and scanning electron micro…
Advanced Sensor and Energy Harvesting MaterialsElectrospun Nanofibers in Biomedical ApplicationsConducting polymers and applications
Ken Kuriki、Yasuhiro Koike、Yoshi Okamoto2002-05-07OpenAlex
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPlastic Optical Fiber Lasers and Amplifiers Containing Lanthanide ComplexesKen Kuriki, Yasuhiro Koike, and Yoshi OkamotoView Author Information Faculty of Science and Technology, Keio University, Yokohama, Kanagawa 223-8522, Japan, JST ERATO, Koike Photonics Polymer Project,…
Organic Light-Emitting Diodes ResearchLanthanide and Transition Metal ComplexesLuminescence Properties of Advanced Materials
Beatrice Cobucci‐Ponzano、Marco Moracci、Barbara Di Lauro 等 6 位作者2002-05-06Proteins Structure Function and Bioinformatics
Biochemical, crystallographic, and computational data support the hypothesis that electrostatic interactions are among the dominant forces in stabilizing hyperthermophilic proteins. The thermostable beta-glycosidase from the hyperthermophile Sulfolobus solfataricus (Ssbeta-gly) is an interesting model system for the s…
Protein Structure and DynamicsEnzyme Production and CharacterizationEnzyme Structure and Function