Izabela Schmidt、Piotr J. Chmielewski2001-12-11Chemical Communications
Reaction of 5,10,15,20-tetraphenyl-2-aza-21-carbaporphyrinatonickel(II) with dihalomethanes in the presence of a proton scavenger gives a 2,21'-CH2-linked dimer of Ni(II) inverted porphyrins with the yield reaching 90% and its 2,2'-linked isomer as a minor product.
Supramolecular Chemistry and ComplexesPorphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation Mechanisms
Hideki Abe、Yoshiharu Doi2001-12-11Biomacromolecules
Three types of random copolymers with 94 mol % (R)-3-hydroxybutyric acid (3HB) and 6 mol % (R)-3-hydroxyalkanoic acids with different side-chain lengths, (R)-3-hydroxypentanoic acid (3HV), (R)-3-hydroxyhexanoic acid (3HHx), and medium-chain-length (R)-3-hydroxyalkanoic acids (mcl-3HA, C8-C12), were prepared by biologi…
biodegradable polymer synthesis and propertiesMicroplastics and Plastic PollutionCarbon dioxide utilization in catalysis
Tomoki Ogoshi、Hideaki Itoh、Kyung Min Kim 等 4 位作者2001-12-11Macromolecules
Organic−inorganic polymer hybrids were prepared by an in-situ method. In the presence of ruthenium salt, the cross-linking reaction of bipyridyl-containing polymer was carried out together with the sol−gel reaction of tetramethoxysilane. This methodology includes the simultaneous formation of silica gel and organic ge…
Mesoporous Materials and CatalysisPolyoxometalates: Synthesis and ApplicationsSynthetic Organic Chemistry Methods
Yu‐Chuan Liu2001-12-11Langmuir
In this study, polypyrrole (PPy) films were electrochemically deposited on gold substrates roughened by a triangular-wave oxidation−reduction cycle (ORC) in an aqueous solution containing 0.1 N KCl. The results indicate that the intensity of surface-enhanced Raman scattering (SERS) of PPy significantly depends on the…
Electrochemical sensors and biosensorsConducting polymers and applicationsElectrochemical Analysis and Applications
Martinus H. V. Werts、Mathieu Lambert、Jean‐Philippe Bourgoin 等 4 位作者2001-12-11Nano Letters
Electron beam lithography on Langmuir−Blodgett films of alkanethiol-capped gold nanoparticles is shown to be a viable strategy to define nanometer scale structures of such particles. Sub-50 nm wide “nanowires”, the thickness of which is controlled at the single particle level, are created with e-beam doses in the mC/c…
Gold and Silver Nanoparticles Synthesis and ApplicationsQuantum Dots Synthesis And PropertiesMolecular Junctions and Nanostructures
M. Sahana、M. S. Dharmaprakash、S. A. Shivashankar2001-12-11Journal of Materials Chemistry
Thin films of vanadium dioxide have been deposited on glass by low pressure metal-organic chemical vapour deposition using the β-diketonate complex, vanadyl acetylacetonate, as the precursor. It is found that nearly monophasic, monoclinic VO2(M) films are formed in the narrow temperature range 475–520 °C, films formed…
ZnO doping and propertiesTransition Metal Oxide NanomaterialsGa2O3 and related materials
Kyungwha Park、M. A. Novotny、Naresh S. Dalal 等 5 位作者2001-12-11Physical review. B, Condensed matter
Electron paramagnetic resonance measurements on single crystals of the molecular magnets ${\mathrm{Fe}}_{8}$ and ${\mathrm{Mn}}_{12}$ reveal complex nonlinearities in the linewidths as functions of energy eigenstate, frequency, and temperature. Using a density-matrix equation with distributions of the uniaxial anisotr…
Magnetism in coordination complexesLanthanide and Transition Metal ComplexesElectron Spin Resonance Studies
Ji‐Zhao Liang2001-12-11Journal of Applied Polymer Science
Abstract The recent advances in the toughening and reinforcing methods and theories in rigid inorganic particulate (RIP)‐filled poly(propylene) (PP) composites have been reviewed. Studies have shown that under given conditions, in addition to the obvious increase of modulus, an obvious brittle–ductile transition also…
Mechanical Behavior of CompositesPolymer crystallization and propertiesFiber-reinforced polymer composites
Karine Masenelli‐Varlot、Emmanuelle Reynaud、Gérard Vigier 等 4 位作者2001-12-11Journal of Polymer Science Part B Polymer Physics
Abstract Intercalated and exfoliated nanocomposites were prepared by extrusion and injection of polyamide‐6 and highly swollen or slightly swollen montmorillonite, respectively. The microstructure of the nanocomposites has been studied previously. In this article, we investigated the influence of the preferential orie…
Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesTribology and Wear Analysis
Jun Pang、Ye Tao、Stephan Freiberg 等 6 位作者2001-12-11Journal of Materials Chemistry
Four novel blue luminescent star-shaped compounds 1,3,5-tris(di-2-pyridylamino)benzene, 1, 1,3,5-tris[p-(di-2-pyridylamino)phenyl]benzene, 2, 2,4,6-tris(di-2-pyridylamino)-1,3,5-triazine, 3, and 2,4,6-tris[p-(di-2-pyridylamino)phenyl]-1,3,5-triazine, 4, have been synthesized and fully characterized. Compounds 1, 2 and…
Organic Light-Emitting Diodes ResearchLuminescence and Fluorescent MaterialsSynthesis and Characterization of Heterocyclic Compounds
R. Gunnarsson、A. Kadigrobov、Z. Ivanov2001-12-11arXiv
We have studied the temperature dependence of low-field magnetoresistance and current-voltage characteristics of a low-angle bi-crystal grain boundary junction in perovskite manganite La_{2/3}Sr_{1/3}MnO_3 thin film. By gradually trimming the junction we have been able to reveal the non-linear behavior of the latter.…
Materials Science
Q. Zhan、R. Yu、L. L. He 等 7 位作者2001-12-11arXiv
A reversible structural transition of an epitaxial La2/3Sr1/3MnO3 film deposited on the LaAlO3 substrate has been investigated by means of in situ high-resolution transmission electron microscopy (HREM) and electron diffraction, combined with image and diffraction calculations. We observe that the crystallographic sym…
Materials ScienceStrongly Correlated Electrons
Francesca Colaiori、Andrea Gabrielli、Stefano Zapperi2001-12-11arXiv
We analyze the demagnetization properties of the random-field Ising model on the Bethe lattice focusing on the beahvior near the disorder induced phase transition. We derive an exact recursion relation for the magnetization and integrate it numerically. Our analysis shows that demagnetization is possible only in the c…
Materials Sciencecond-mat.stat-mech
Hideo Aoki、Mikito Koshino、Daiki Takeda 等 5 位作者2001-12-11Physical review. B, Condensed matter
The electronic band structure for electrons bound on periodic minimal surfaces is differential-geometrically formulated and numerically calculated. We focus on minimal surfaces because they are not only mathematically elegant (with the surface characterized completely in terms of ``navels'') but represent the topology…
Advanced Chemical Physics StudiesGraphene research and applicationsFullerene Chemistry and Applications
P. M. Gehring、S. Wakimoto、Zuo‐Guang Ye 等 4 位作者2001-12-11Physical Review Letters
We report neutron inelastic scattering measurements of the lowest-energy transverse optic (TO) phonon branch in the relaxor Pb(Mg1/3Nb2/3)O3 from 400 to 1100 K. Far above the Burns temperature T(d) approximately 620 K we observe well-defined propagating TO modes at all wave vectors q, and a zone center TO mode that so…
Ferroelectric and Piezoelectric MaterialsPhotorefractive and Nonlinear OpticsAcoustic Wave Resonator Technologies
Branton J. Campbell、R. Osborn、D. N. Argyriou 等 10 位作者2001-12-11Physical review. B, Condensed matter
A system of strongly interacting electron-lattice polarons can exhibit charge and orbital order at sufficiently high polaron concentrations. In this study, the structure of short-range polaron correlations in the layered colossal magnetoresistive perovskite manganite ${\mathrm{La}}_{1.2}{\mathrm{Sr}}_{1.8}{\mathrm{Mn}…
Magnetic and transport properties of perovskites and related materialsMultiferroics and related materialsAdvanced Condensed Matter Physics
В. Е. Асадчиков、Inna Bukreeva、Angela Duparré 等 10 位作者2001-12-10Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
The analysis of the roughness of B<SUB>4</SUB>C films of different thickness as well as W/B<SUB>4</SUB>C multilayer mirrors of different periods is performed basing on AFM and x-ray scattering (XRS) measurements. It is demonstrated that the linear model of a film growth is able to describe the whole set of experimenta…
Electron and X-Ray Spectroscopy TechniquesX-ray Diffraction in CrystallographySurface Roughness and Optical Measurements
G. C. Papavassiliou、George A. Mousdis、Ioannis Koutselas 等 4 位作者2001-12-10International Journal of Modern Physics B
The photoconductivity (PC) spectra of the compounds CH 3 NH 3 PbI 3 , [CH 3 NH 3 ][CH 3 C 6 H 4 CH 2 NH 3 ] 2 Pb 2 I 7 , [CH 3 C 6 H 4 CH 2 NH 3 ] 2 PbI 4 , [H 2 NC(I)=NH 2 ] 3 PbI 5 as well as the spectra of similar compounds bases on C 10 H 21 SC(NH 2 ) 2 , H 3 N(CH 2 ) 6 NH 3 , C 14 H 9 CH 2 SC(NH 2 ) 2 , SnI 4 , P…
Luminescence Properties of Advanced MaterialsPhotochemistry and Electron Transfer StudiesSolid-state spectroscopy and crystallography
Joonghoe Dho、W. S. Kim、Nam Hwi Hur2001-12-10Physical review. B, Condensed matter
We have investigated the magnetic and transport properties of the Gd-doped layered manganite $({\mathrm{La}}_{0.8}{\mathrm{Gd}}_{0.2}{)}_{1.4}{\mathrm{Sr}}_{1.6}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}.$ The Gd-doped compound shows the nonmetallic spin-glass-like state below 30 K, driven by competing interaction between the…
Magnetic and transport properties of perovskites and related materialsMultiferroics and related materialsAdvanced Condensed Matter Physics
Elizabeth C. Dickey、Craig A. Grimes、Mahaveer K. Jain 等 8 位作者2001-12-10Applied Physics Letters
Visible photoluminescence at 515 nm of ruthenium-doped multiwall carbon nanotubes, fabricated on quartz substrates using a chemical vapor deposition technique, is reported. The well-aligned nanotubes serve as templates for the luminescent, residual ruthenium–iron catalyst particles contained within the nanotubes, rest…
Carbon Nanotubes in CompositesMechanical and Optical ResonatorsNanotechnology research and applications