Yuqing Wang、Fengqiu Zhang、Peter M. A. Sherwood1999-08-17Chemistry of Materials
The paper examines the interaction of a carbon fiber surface, surface-treated by galvanostatic electrochemical oxidation in nitric acid solution, with poly(vinyl alcohol) (PVA). The surface chemistry of the fiber before and after interaction was examined by core and valence band X-ray photoelectron spectroscopy (XPS),…
Fiber-reinforced polymer compositesRecycling and Waste Management TechniquesElectron and X-Ray Spectroscopy Techniques
Elka S. Basheva、Theodor D. Gurkov、Ivan Ivanov 等 6 位作者1999-08-17Langmuir
In this work we study experimentally the lifetime of oil droplets pressed by buoyancy against a large oil/water interface, in a system containing protein (bovine serum albumin). The stability of the drops depends strongly on their size, which can be explained with the hydrodynamics of thinning of the gap region. Two d…
Fluid Dynamics and Heat TransferPickering emulsions and particle stabilizationFluid Dynamics and Thin Films
Eric W. Bohannan、Mark G. Shumsky、Jay A. Switzer1999-08-17Chemistry of Materials
Epitaxial electrodeposition was used to crystallize a 0.5 μm thick film of Cu2O onto single-crystal Au(100) from an alkaline copper lactate solution at room temperature. The film showed strong out-of-plane and in-plane orientation, with no rotation of the respective crystallographic directions of the Cu2O overlayer re…
ZnO doping and propertiesElectrodeposition and Electroless CoatingsCopper-based nanomaterials and applications
Michael T. Green1999-08-17Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTEvidence for Sulfur-Based Radicals in Thiolate Compound I IntermediatesMichael T. GreenView Author Information Department of Chemistry and Beckman Institute California Institute of Technology 1200 East California, Pasadena, California 91125 Department of Chemistry and…
Perovskite Materials and ApplicationsOrganic and Molecular Conductors ResearchSolid-state spectroscopy and crystallography
Alexandre Dokoutchaev、J. Thomas James、Shannon C. Koene 等 6 位作者1999-08-17Chemistry of Materials
Three different methods are described for uniformly anchoring metal colloids (Pt, Pd, and Au) onto the surface of polystyrene microspheres (PSMS). The first method we have employed is electrostatic deposition of preformed anionic colloidal particles onto a polycationic surface. In this method the functional groups on…
Gold and Silver Nanoparticles Synthesis and ApplicationsQuantum Dots Synthesis And PropertiesPolymer Surface Interaction Studies
Dmitry N. Chigrin、Andrei V. Lavrinenko、Dmitry A. Yarotsky 等 4 位作者1999-08-17arXiv
A remarkable property of one-dimensional all-dielectric periodic structures has recently been reported, namely a one-dimensional lattice can totally reflect electromagnetic wave of any polarization at all angles within a prescribed frequency region. Unlike their metallic counterpart, such all-dielectric omnidirectiona…
Materials ScienceSoft Condensed Matter
M. W. Cole、V. H. Crespi、G. Stan 等 6 位作者1999-08-17arXiv
Helium atoms are strongly attracted to the interstitial channels within a bundle of carbon nanotubes. The strong corrugation of the axial potential within a channel can produce a lattice gas system where the weak mutual attraction between atoms in neighboring channels of a bundle induces condensation into a remarkably…
Materials Sciencecond-mat.stat-mech
Ines Batinic̈‐Haberle、Ivan Spasojević、Peter Hambright 等 6 位作者1999-08-17Inorganic Chemistry
The log k cat values for the dismutation of O 2 • - by a series of monohydroxoiron(III) and aquamanganese(III) porphyrins, including ortho, meta, and para isomers of 5,10,15,20-tetrakis( N -alkylpyridiniumyl)porphyrins, were found to vary linearly with the metal-centered redox potentials ( E 1/2 ) for the M(III)/M(II)…
Porphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation MechanismsHemoglobin structure and function
Zeev Gross、Nitsa Galili1999-08-16Angewandte Chemie
Obwohl sie schon seit fast 35 Jahren bekannt sind, wurde erst jetzt erkannt, daß N-substituierte Corrole chiral sind. In einer einfachen Zweischrittsynthese wurden mehrere dieser Verbindungen hergestellt; ihre Trennung in die Enantiomere gelang durch HPLC. Vom abgebildeten Corrol wurde auch der Zink(II)-Komplex synthe…
Porphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation MechanismsSurface Chemistry and Catalysis
Yoichi Takanishi、Hideo Takezoe、Yoshiichi Suzuki 等 7 位作者1999-08-16Angewandte Chemie International Edition
Right- and left-handed homochiral domains segregate in a fluid smectic phase of the racemic (R*,S*)-beta-Me-TFMHPOBC analogue shown. This CF(3)-containing liquid crystalline compound exhibits an electrooptic response in a homogeneous cell, although no macroscopic dipole is expected to exist. Moreover, the homeotropic…
Liquid Crystal Research AdvancementsOrigins and Evolution of LifeMolecular spectroscopy and chirality
S. Manotas、F. Agulló‐Rueda、José David Moreno 等 6 位作者1999-08-16Applied Physics Letters
We have measured depth-resolved microphotoluminescence (PL) and micro-Raman spectra on the cross section of porous silicon multilayers to sample different layer depths. The PL emission band gets stronger, blueshifts, and narrows at the high porosity layers. On the contrary, the Raman band weakens and broadens. This ba…
Semiconductor materials and devicesSilicon Nanostructures and PhotoluminescenceNanowire Synthesis and Applications
Yoshiki Shimizu、Yusuke Moriyoshi、Hideki Tanaka 等 4 位作者1999-08-16Applied Physics Letters
Boron nitride (BN) nanotubes were prepared by a high-temperature plasma jet method. While the BN nanotubes were found in quantity on the surface of a BN sintered disk, amorphous BN webs were found dominant in the water-cooled collector. These structures were studied on the basis of transmission electron microscopy obs…
Diamond and Carbon-based Materials ResearchFullerene Chemistry and ApplicationsBoron and Carbon Nanomaterials Research
Kee-Won Kwon、Hoo-Jeong Lee、Robert Sinclair1999-08-16Applied Physics Letters
This letter describes the formation of a thin amorphous layer at the tetragonal-Ta/Cu interfaces, which appear in copper metallization structures of microelectronic devices. The disordered layer grows up to 4 nm when annealed at between 400 and 600 °C. Since Ta and Cu are immiscible according to thermodynamic data, th…
Metal and Thin Film MechanicsSemiconductor materials and devicesCopper Interconnects and Reliability
Philipp Gütlich、Klaus‐Jürgen Range、Claudia Felser 等 7 位作者1999-08-16Angewandte Chemie International Edition
The hitherto controversial valence states of nickel and tin in the ternary chalcogenide Ni(3)Sn(2)S(2) (see structure) have been determined by photoelectron and Mössbauer spectroscopy ((61)Ni, (119)Sn). Results from band structure calculations confirmed that this shandite phase is a metal and that the approximate dist…
Crystal Structures and PropertiesIron-based superconductors researchInorganic Chemistry and Materials
Zeev Gross、Nitsa Galili1999-08-16Angewandte Chemie International Edition
Although known for almost 35 years, N-substituted corroles have only now been recognized as being chiral. Several examples of these species were prepared in a facile two-step synthesis and separated into their enantiomers by HPLC. The zinc(II) complex of the corrole shown schematically was also synthesized.
Porphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation MechanismsSurface Chemistry and Catalysis
Tsutomu Shimizu-Iwayama、D.E. Hole、Ian W. Boyd1999-08-16Journal of Physics Condensed Matter
A possible mechanism for the photoemission from Si nanocrystals in an amorphous SiO 2 matrix fabricated by ion implantation is reported. We have measured the implantation dose and the temperature dependence as well as the oxidation effect of the photoluminescence behaviour of Si nanocrystals in SiO 2 layers fabricated…
Semiconductor materials and devicesSilicon Nanostructures and PhotoluminescenceNanowire Synthesis and Applications
Zhishan Bo、Jürgen P. Rabe、A. Dieter Schlüter1999-08-16Angewandte Chemie International Edition
Langmuir monolayers are formed from an amphiphilically decorated poly(para-phenylene), which indicates that its hydrophilic and hydrophobic parts segregate lengthwise along the polymer backbone in this nanometer-sized cylinder as illustrated in A. This polymer differs from known amphiphiles in that it consists of a li…
Advanced Polymer Synthesis and CharacterizationPolymer Surface Interaction StudiesDendrimers and Hyperbranched Polymers
E. Poles、Donald C. Selmarten、O. I. Mićić 等 4 位作者1999-08-16Applied Physics Letters
We report anti-Stokes photoluminescence (photon energy up-conversion) from size-quantized CdSe and InP nanocrystalline colloids. The observed up-conversion is highly efficient and occurs at very low excitation intensities. With low temperatures the intensity of the up-converted photoluminescence decreases while that o…
Quantum Dots Synthesis And PropertiesChalcogenide Semiconductor Thin FilmsNonlinear Optical Materials Studies
L. Bellaïche、David Vanderbilt1999-08-16Physical Review Letters
First-principles supercell calculations and the modern theory of polarization are used to compute the ${e}_{33}$ piezoelectric coefficients of $\mathrm{Pb}({\mathrm{Zr}}_{0.5}{\mathrm{Ti}}_{0.5}{\mathrm{O}}_{3})$ (PZT) and $0.60\mathrm{Pb}({\mathrm{Mg}}_{1/3}{\mathrm{Nb}}_{2/3}){\mathrm{O}}_{3}+0.40{\mathrm{PbTiO}}_{3…
Ferroelectric and Piezoelectric MaterialsAcoustic Wave Resonator TechnologiesMicrowave Dielectric Ceramics Synthesis
D. K. Petrov、L. Krusin‐Elbaum、J. Z. Sun 等 5 位作者1999-08-16Applied Physics Letters
We report significant enhancements of magnetoresistance in granular (La0.67Ca0.33MnO3)x/(SrTiO3)1−x. The system exhibits a conduction threshold at x=xc∼60%, around which magnetoresistance versus x has a maximum. The composition xc at which maximum enhancement in magnetoresistance is observed is the same at high (aroun…
Magnetic and transport properties of perovskites and related materialsAdvanced Condensed Matter PhysicsElectronic and Structural Properties of Oxides