B. M. Choudary、Naidu S. Chowdari、Sateesh Madhi 等 4 位作者2003-02-07The Journal of Organic Chemistry
A heterogeneous bifunctional catalyst composed of OsO4(2-)-WO4(2-) and a trifunctional catalyst comprising PdCl4(2-)-OsO4(2-)-WO4(2-), designed and prepared by an ion-exchange technique using layered double hydroxides (LDH) as an ion-exchanger and their homogeneous bifunctional analogue, K2OsO4-Na2WO4 and trifunctiona…
Mesoporous Materials and CatalysisPolyoxometalates: Synthesis and ApplicationsLayered Double Hydroxides Synthesis and Applications
V. A. Chernenko、Victor A. L’vov、S. P. Zagorodnyuk 等 4 位作者2003-02-07Physical review. B, Condensed matter
A consistent consideration of ferromagnetic alloys undergoing a cubic-tetragonal martensitic transformation on cooling is carried out within the framework of Landau theory. The concept of two different Curie temperatures, corresponding to the parent (austenitic) and resultant (martensitic) phases, is substantiated by…
Microstructure and Mechanical Properties of SteelsShape Memory Alloy TransformationsMagnetic Properties and Applications
Tanya Knickerbocker、Todd Strother、Michael P. Schwartz 等 7 位作者2003-02-07Langmuir
Preparation and hybridization of DNA-modified polycrystalline diamond substrates with fluorescently labeled complementary and noncomplementary oligonucleotide sequences were investigated. Hydrogen-terminated, free-standing diamond substrates were photochemically modified to produce amine-terminated surfaces. X-ray pho…
Semiconductor materials and devicesDiamond and Carbon-based Materials ResearchMolecular Junctions and Nanostructures
Xiaohong Wang、Jingfu Liu、Michael T. Pope2003-02-07Dalton Transactions
Using a reversed-phase microemulsion polymerization method, polyoxometalate (POM) CoW11TiO40 loaded starch nanoparticles have been prepared and structurally characterized by elemental analyses, IR spectra, UV-vis and ESR spectroscopy. The particle size of CoW11TiO40/starch was estimated by transmission electron micros…
Metal-Organic Frameworks: Synthesis and ApplicationsPolyoxometalates: Synthesis and ApplicationsAdvanced Nanomaterials in Catalysis
Nikolai Gaponik、Igor L. Radtchenko、Maria R. Gerstenberger 等 6 位作者2003-02-07Nano Letters
Microcapsules consisting solely of biocompatible components were prepared in water by a colloidal templating technique on soluble carbonate cores using alginic acid sodium salt, protamine sulfate, dextrane sulfate, and chitosan. These microcapsules, as well as capsules made from synthetic polyelectrolytes, were labele…
Quantum Dots Synthesis And PropertiesChalcogenide Semiconductor Thin FilmsNanocluster Synthesis and Applications
N.M. Shavaleev、Simon J. A. Pope、Zöe R. Bell 等 5 位作者2003-02-07Dalton Transactions
Reaction of the potentially bis-bidentate bridging ligand 3,6-bis(2-pyridyl)tetrazine (BPTZ) with various lanthanide complexes [Ln(tta)3(H2O)2] [Htta = thenoyl(trifluoro)acetone; Ln = La, Nd, Gd, Er, Yb] in aqueous ethanol afforded the mononuclear complexes [Ln(tta)3(BPTZ)] (Ln = La, Nd) or the dinuclear complexes [{L…
Medical Imaging Techniques and ApplicationsLuminescence and Fluorescent MaterialsLanthanide and Transition Metal Complexes
Jin Zhao、Jinlong Yang、Junfeng Hou2003-02-07Physical review. B, Condensed matter
The geometric and electronic properties of small two-dimensional (2D) ${\mathrm{Au}}_{N}$ $(N=2--20)$ clusters are studied using the density-functional method. The lowest-energy geometries of a closed-packed nature are selected for 2D ${\mathrm{Au}}_{2}\ensuremath{-}{\mathrm{}\mathrm{Au}}_{8}$ clusters. A clear odd-ev…
Graphene research and applicationsMolecular Junctions and NanostructuresSurface and Thin Film Phenomena
Hiroshi Uyama、Mai Kuwabara、Takashi Tsujimoto 等 4 位作者2003-02-07Biomacromolecules
Epoxide-containing polyesters were enzymatically synthesized via two routes using unsaturated fatty acids as starting substrate. Lipase catalysis was used for both polycondensation and epoxidation of the unsaturated fatty acid group. One route was synthesis of aliphatic polyesters containing an unsaturated group in th…
biodegradable polymer synthesis and propertiesSynthetic Organic Chemistry MethodsCarbon dioxide utilization in catalysis
S Bellucci、J. Gonzalez、P. Onorato2003-02-07arXiv
We develop a dimensional regularization approach to deal with the low-energy effects of the long-range Coulomb interaction in 1D electron systems. The method allows us to avoid the infrared singularities arising from the long-range Coulomb interaction at D = 1, providing at the same time insight about the fixed-points…
Materials ScienceStrongly Correlated Electronshep-th
N. Naka、N. Nagasawa2003-02-07arXiv
Density distribution of cold exciton clouds generated into a strain-induced potential well by two-photon excitation in Cu$_2$O is studied at 2 K. We find that an anomalous spike, which can be interpreted as accumulation of the excitons into the ground state, emerges at the potential minimum. The accumulation can be du…
Materials Sciencecond-mat.stat-mech
Ronald Fisch2003-02-07arXiv
Heat bath Monte Carlo simulations have been used to study a four-state clock model with a type of random field on simple cubic lattices. The model has the standard nonrandom two-spin exchange term with coupling energy $J$ and a random field which consists of adding an energy $D$ to one of the four spin states, chosen…
cond-mat.dis-nnMaterials Science
Pil-Ryung Cha、Dong_Hee Yeon、Jong-Kyu Yoon2003-02-07arXiv
Coherent misfitting precipitates in elastically stressed media such as $γ\prime$ particles in nickel-based super-alloys show various splitting patterns such as doublets, quartets, or octets due to their misfit strain energy. While it is an interesting instability phenomenon defying conventional surface thermodynamics,…
Materials Science
Ole Becker、Yi‐Bing Cheng、Russell J. Varley 等 4 位作者2003-02-07Macromolecules
This paper investigates the relationship between cure temperature, morphology, and mechanical properties of di-, tri-, and tetrafunctional high-performance, epoxy layered-silicate nanocomposites. Wide-angle X-ray analysis (XRD) was carried out at different stages of cure to monitor organoclay exfoliation kinetics. It…
Polymer Nanocomposites and PropertiesPolymer Nanocomposite Synthesis and IrradiationSilicone and Siloxane Chemistry
Chun‐Lin Jia、Markus Lentzen、K. Urban2003-02-07OpenAlex
Using an imaging mode based on the adjustment of a negative value of the spherical-aberration coefficient of the objective lens of a transmission electron microscope, we successfully imaged all types of atomic columns in the dielectric SrTiO3 and the superconductor YBa2Cu3O7. In particular, we were able to view the ox…
Advanced Electron Microscopy Techniques and ApplicationsElectron and X-Ray Spectroscopy TechniquesElectronic and Structural Properties of Oxides
Jun Li、Xi Li、Hua‐Jin Zhai 等 4 位作者2003-02-07OpenAlex
Photoelectron spectroscopy revealed that a 20-atom gold cluster has an extremely large energy gap, which is even greater than that of C60, and an electron affinity comparable with that of C60. This observation suggests that the Au20 cluster should be highly stable and chemically inert. Using relativistic density funct…
Fullerene Chemistry and ApplicationsNanocluster Synthesis and ApplicationsInorganic Chemistry and Materials
Yoshihiko Komori、Shigenobu Hayashi2003-02-06Langmuir
Reversible color change of a neutral chromophore in a cationic zeolite was achieved by controlling the direct interaction between alkali-metal cations and chromophores. As a typical combination of the cationic host and the neutral chromophore, Na + -type mordenite accommodating N,N -dimethyl- p -nitroaniline (DMpNA) w…
Conducting polymers and applicationsMesoporous Materials and CatalysisElectrochemical Analysis and Applications
Hong Meng、Dmitrii F. Perepichka、Fred Wudl2003-02-06Angewandte Chemie
Geringes Erhitzen genügt, um kristallines 2,5-Dibrom-3,4-ethylendioxythiophen in ein gut leitendes, bromdotiertes Poly(3,4-ethylendioxythiophen) (PEDOT) zu überführen. Die Leitfähigkeit des Polymers kann durch Dotierung mit Iod weiter erhöht werden. Mit dieser Methode können auch dünne Filme von PEDOT mit einer Leitfä…
Organic Electronics and PhotovoltaicsConducting polymers and applicationsAnalytical Chemistry and Sensors
M. A. Hernández、José A. Velasco、M. Asomoza 等 8 位作者2003-02-06Energy & Fuels
Microporous silica solids of SiO 2 and Ag/SiO 2 (a microporous SiO 2 substrate containing 5 wt % Ag) are synthesized by the sol−gel method and analyzed through several characterization techniques. The type I shapes of N 2 sorption isotherms at 76 K on these materials indicate large micropore contents as well as import…
Zeolite Catalysis and SynthesisMesoporous Materials and CatalysisCovalent Organic Framework Applications
Jeong Won Kang、Sung‐Ho Hwang2003-02-06Nanotechnology
This study shows the response of silicon nanotubes (SiNTs) under axial compression using an atomistic simulation based on the Tersoff potential. The application of pressure, proportional to the deformation within Hook’s law, eventually led to a collapse of the SiNT and an abrupt change in structure. Using the sum of t…
Carbon Nanotubes in CompositesGraphene research and applicationsBoron and Carbon Nanomaterials Research
Nobuhiro Watanabe、Nobuhiro Kihara、Yoshio Furusho 等 6 位作者2003-02-06Angewandte Chemie
Ein Through-Space-Superaustausch scheint für die Ladungsrekombination (CR) nach Photoanregung und Ladungstrennung (CS) in Zinkporphyrin-C60-Rotaxanen maßgeblich zu sein (siehe Bild). Darauf weist die niedrige Aktivierungsenergie dieses Prozesses hin, an dem außerdem ein relativ langlebiger Ladungstrennungszustand bete…
Graphene research and applicationsPorphyrin and Phthalocyanine ChemistryFullerene Chemistry and Applications