Dominique Roberto、Renato Ugo、Francesca Tessore 等 11 位作者2001-12-11Organometallics
Coordination to a Zn(II) center of chelating π-delocalized nitrogen donor ligands such as 5-X-1,10-phenanthrolines (X = OMe, NMe 2, trans- CH CHC 6 H 4 - 4‘ - NMe 2, trans,trans -(CH CH) 2 C 6 H 4 - 4‘ - NMe 2 ) produces a significant enhancement of their quadratic hyperpolarizability measured either by the EFISH tech…
Metal complexes synthesis and propertiesCrystal structures of chemical compoundsNonlinear Optical Materials Research
Sonal Desai、I. M. Thakore、Anthony B. Brennan 等 4 位作者2001-12-11Journal of Applied Polymer Science
Abstract Interpenetrating networks (IPNs) of polybutadiene‐based polyurethane (PU) and poly(methyl methacrylate) (PMMA) were synthesized. The effect of the incorporation of 2% glycidyl methacrylate (GMA) and 2‐hydroxyethyl methacrylate (2‐HEMA) on the thermal, mechanical, and morphological properties of IPNs was inves…
Advanced Polymer Synthesis and CharacterizationPolymer Nanocomposites and PropertiesPolymer composites and self-healing
José Antonio Diego Más、Ana Vidaurre、José Meseguer 等 10 位作者2001-12-11Journal of Applied Polymer Science
Abstract Blends of polycarbonate (PC) and poly(acrylonitrile‐ co ‐butadiene‐ co ‐styrene) (ABS) with different compositions are characterized by means of dynamic mechanical measurements. The samples show phase separation. The shift in the temperatures of the main dynamic mechanical relaxation shown by the blend with r…
Polymer crystallization and propertiesMaterial Dynamics and PropertiesPolymer Nanocomposites and Properties
E. Assouline、Ellen Wachtel、S. Grigull 等 6 位作者2001-12-11Macromolecules
γ orthorhombic isotactic polypropylene transcrystallinity nucleated on aramid fibers under high pressure was investigated by synchrotron X-ray diffraction and by scanning electron microscopy. It was determined that the c axes of the lamellae (the growth axes) are distributed radially about the fiber and that the lamel…
Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesFiber-reinforced polymer composites
J. C. F. Pereira、C. Richard A. Catlow、G. D. Price2001-12-11The Journal of Physical Chemistry A
We use molecular dynamics simulations to model realistic silica-based sol−gel solutions containing water, the simplest alcohols (MeOH and EtOH), the simplest silica alkoxides (Si(OMe) 4 and Si(OEt) 4 ), and small silica clusters (Si(OH) 4, Si 2 O(OH) 6, and Si 3 O 3 (OH) 6 ), at ambient conditions. This work builds on…
Zeolite Catalysis and SynthesisMesoporous Materials and CatalysisSpectroscopy and Quantum Chemical Studies
Nirmalya K. Chaki、Surendra G. Sudrik、Harikrishan R. Sonawane 等 4 位作者2001-12-11Chemical Communications
A simple and reproducible single phase preparation of 2.5 nm silver nanoclusters is described using silver benzoate along with triethylamine (TEA) and dodecanethiol (DDT); these spontaneously self-assemble to a two-dimensional array whereas in the absence of thiol only polydispersed nanoclusters are obtained.
Gold and Silver Nanoparticles Synthesis and ApplicationsNanocluster Synthesis and ApplicationsNanomaterials for catalytic reactions
H.‐G. Boyen、G. Kästle、F. Weigl 等 7 位作者2001-12-11Physical Review Letters
The cluster compound Au55(PPh3)12Cl6 has been reanalyzed by photoelectron spectroscopy giving direct evidence for a nonmetallic behavior of the individual Au clusters as long as their ligand shell remains intact. The exposure to x-rays during the measurements is found to partly decompose the shell by removal of the ch…
Nanocluster Synthesis and ApplicationsInorganic Chemistry and MaterialsX-ray Diffraction in Crystallography
Wei Zhao、Chulho Song、Bo Zheng 等 5 位作者2001-12-11The Journal of Physical Chemistry B
The thermal recovery behavior of fluorinated single-walled carbon nanotubes has been systematically examined by UV−vis−near-IR absorption spectroscopy, IR absorption spectroscopy and electric resistance measurements under different annealing temperatures. The decrease in the IR intensity of C−F stretch bands centered…
Carbon Nanotubes in CompositesGraphene research and applicationsThermal properties of materials
Lehui Lu、Haishui Wang、Shiquan Xi 等 4 位作者2001-12-11Journal of Materials Chemistry
A new approach to the preparation of large palladium nanoparticles with diameters between 25 and 100 nm is presented. In this approach PdCl42− ions are reduced on the surface of performed 12-nm-diameter gold “seeds” by the introduction of ascorbic acid. The resultant particles exhibit improved monodispersity relative…
Gold and Silver Nanoparticles Synthesis and ApplicationsNanomaterials for catalytic reactionsNanoporous metals and alloys
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