Attia、Cortlandt G. Pierpont1998-05-15Inorganic Chemistry
Irradiation of a THF solution containing Mn 2 (CO) 10 and 3,6-di- tert -butyl-1,2-benzoquinone (3,6-DBBQ) gave dark green crystals of Mn(thf) 2 (3,6-DBQ) 2 . Structural characterization has shown that the inner coordination geometry about the metal has the axially elongated trans structure that appears characteristica…
Metal complexes synthesis and propertiesLanthanide and Transition Metal ComplexesMagnetism in coordination complexes
Mikael Trollsås、Björn Atthoff、Hans Claesson 等 4 位作者1998-05-15Macromolecules
Novel hyperbranched poly(ε-caprolactone)s have been synthesized. The versatile synthesis utilizes AB 2 macromonomers and allows the thermo-physical properties of the polymers to be tailored. The ε-caprolactone-based AB 2 macromonomers were synthesized through living ring opening polymerization, using aluminum benzylox…
Dendrimers and Hyperbranched PolymersRNA Interference and Gene DeliveryPolymer Surface Interaction Studies
Ching‐I Huang、Timothy P. Lodge1998-05-15Macromolecules
We present a theoretical study of the influence of solvent on ordered block copolymer solutions. The phase behavior is examined as a function of solvent selectivity, temperature, copolymer concentration, composition, and molecular weight. Phase maps are constructed using self-consistent mean-field (SCMF) theory, via t…
Theoretical and Computational PhysicsRheology and Fluid Dynamics StudiesBlock Copolymer Self-Assembly
S. Semenovskaya、A. G. Khachaturyan1998-05-15Journal of Applied Physics
A para→ferroelectric stress-free transition in a random field of static defects is studied by the computer simulation method. It is shown that the electrostatic dipole–dipole interaction may produce in the ferroelectric transition the same “martensitelike” effects as the strain-induced interaction in the martensitic t…
Ultrasonics and Acoustic Wave PropagationAcoustic Wave Resonator TechnologiesFerroelectric and Piezoelectric Materials
K. T. Leung、Simone Pokrant、K. Birgitta Whaley1998-05-15Physical review. B, Condensed matter
The fine structure in the CdSe nanocrystal absorption spectrum is computed by incorporating two-particle electron-hole interactions and spin-orbit coupling into a tight-binding model, with an expansion in electron-hole single-particle states. The exchange interaction and spin-orbit coupling give rise to dark, low-lyin…
Chalcogenide Semiconductor Thin FilmsQuantum Dots Synthesis And PropertiesPerovskite Materials and Applications
H. Hubert、L. A. J. Garvie、Bertrand Devouard 等 6 位作者1998-05-15Chemistry of Materials
Boron suboxide, nominally B 6 O, was synthesized by reducing B 2 O 3 with B up to 10 GPa in a multianvil press at temperatures between 1200 and 1800 °C. The samples were characterized by powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and parallel electron energy-loss spectros…
Boron and Carbon Nanomaterials ResearchMXene and MAX Phase MaterialsAdvanced ceramic materials synthesis
R. Graupner、Florian Maier、J. Ristein 等 5 位作者1998-05-15Physical review. B, Condensed matter
The carbon $1s$ core levels of diamond (100) and (111) surfaces were investigated using high-resolution photoelectron spectroscopy. The surfaces were prepared in a hydrogen plasma, which is known to result in atomically flat surfaces. From the signature of the C $1s$ core-level spectra, four different surface terminat…
High-pressure geophysics and materialsDiamond and Carbon-based Materials ResearchAdvanced Chemical Physics Studies
François L. Huyskens、P. Huyskens、André Persoons1998-05-15The Journal of Chemical Physics
In this paper, the influence of solvents on the first hyperpolarizability β of nonlinear optical (NLO) molecules is studied at 25 °C for solutions of p-nitroaniline and N,N-dimethyl paranitroaniline in some 50 solvents belonging to different classes. The hyperpolarizabilities deduced from measured hyper-Rayleigh scatt…
Nonlinear Optical Materials ResearchChemical synthesis and pharmacological studiesPhotochemistry and Electron Transfer Studies
I. Jiménez、D. G. J. Sutherland、T. van Buuren 等 6 位作者1998-05-15Physical review. B, Condensed matter
We present a photoemission and x-ray-absorption study on boron carbide which identifies the spectroscopic features of this material, discussing them in connection with current structural models. A study on the surface thermal stability is also performed, revealing that despite the high melting point of boron carbide $…
Diamond and Carbon-based Materials ResearchAdvanced ceramic materials synthesisBoron and Carbon Nanomaterials Research
W. Shiramura、K. Takatsu、Budhy Kurniawan 等 9 位作者1998-05-15Journal of the Physical Society of Japan
The magnetic susceptibility and high-field magnetization process of NH 4 CuCl 3 with double chains of CuCl 3 have been measured using single crystals. No anomaly indicative of the three-dimensional ordering is observed in susceptibility data above 1.7 K. It is found, by magnetization measurement down to 0.5 K, that in…
Solid-state spectroscopy and crystallographyPerovskite Materials and ApplicationsAdvanced Condensed Matter Physics
E. Knoesel、A. Hötzel、Martin Wolf1998-05-15Physical review. B, Condensed matter
Time-resolved two-photon photoemission (2PPE) at various photon energies is used to investigate the relaxation dynamics of hot electrons in Cu(111), applying auto- and cross-correlation techniques. The relaxation times vary from 250 fs at 0.1 eV above the Fermi level to 20 fs at 2 eV and show a strong wavelength depen…
Advanced Chemical Physics StudiesSurface and Thin Film PhenomenaElectron and X-Ray Spectroscopy Techniques
Volker Eyert、K.‐H. Höck1998-05-15Physical review. B, Condensed matter
We present results of all-electron electronic-structure calculations for semiconducting vanadium pentoxide. The calculations are based on density-functional theory within the local-density approximation and employ the augmented spherical wave method in its scalar-relativistic implementation. The electronic properties…
Transition Metal Oxide NanomaterialsGa2O3 and related materialsCatalysis and Oxidation Reactions
Donny Wang、Yevgeniy Fotinich、Greg P. Carman1998-05-15OpenAlex
This paper presents research results on the electro–thermomechanical behavior of piezoelectric ceramics for use in actuator applications with an emphasis on ferroelectric fatigue. The material being investigated is a lead zirconate titanate piezoelectric ceramic with the composition PbZr0.53Ti0.47O3 (PZT-5H). Results…
Numerical methods in engineeringFerroelectric and Piezoelectric MaterialsUltrasonics and Acoustic Wave Propagation
Hatsumi Mori、Shōji Tanaka、Takehiko Mori1998-05-15OpenAlex
The behavior of the phase transitions is mapped out as a function of the dihedral angle (\ensuremath{\theta}) or the transfer integral $(t)$ between donor columns for \ensuremath{\theta}-type BEDT-TTF [BEDT-TTF: bis(ethylenedithio)tetrathiafulvalene, abbreviated as ET] salts involving the series $\ensuremath{\theta}\e…
Organic and Molecular Conductors ResearchMagnetism in coordination complexesMolecular Junctions and Nanostructures
K. Ueda、Hitoshi Tabata、Tomoji Kawai1998-05-15OpenAlex
Ferromagnetic spin order has been realized in the LaCrO3-LaFeO3 superlattices. Ferromagnetic coupling between Fe3+ and Cr3+ through oxygen has long been expected on the basis of Anderson, Goodenough, and Kanamori rules. Despite many studies of Fe-O-Cr-based compounds, random positioning of Fe3+ and Cr3+ ions has frust…
Advanced Condensed Matter PhysicsMagnetic and transport properties of perovskites and related materialsMultiferroics and related materials
Tsuneya Ando、Takeshi Nakanishi1998-05-15OpenAlex
The effective potential of an impurity in a k · p scheme is derived in two-dimensional graphite sheet. When the potential range is smaller than the lattice constant, it has an off-diagonal matrix element between K and K ′ points comparable to the diagonal element. With the increase of the range, this off-diagonal elem…
Graphene research and applicationsCarbon Nanotubes in CompositesThermal properties of materials
Jye‐Shane Yang、Timothy M. Swager1998-05-15OpenAlex
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPorous Shape Persistent Fluorescent Polymer Films: An Approach to TNT Sensory MaterialsJye-Shane Yang and Timothy M. SwagerView Author Information Department of Chemistry Massachusetts Institution of Technology 77 Massachusetts Ave., Cambridge, Massachusetts 02139 Cite…
Luminescence and Fluorescent MaterialsOrganic Electronics and PhotovoltaicsPhotochemistry and Electron Transfer Studies
V. Srikant、David R. Clarke1998-05-15OpenAlex
Three different values (3.1, 3.2, and 3.3 eV) have been reported for the optical band gap of zinc oxide single crystals at room temperature. By comparing the optical properties of ZnO crystals using a variety of optical techniques it is concluded that the room temperature band gap is 3.3 eV and that the other values a…
Ga2O3 and related materialsZnO doping and propertiesGas Sensing Nanomaterials and Sensors
Diana L. Wertz、Marlene F. Sisemore、Matthias Selke 等 5 位作者1998-05-14Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMimicking Cytochrome P-450 2B4 and Aromatase: Aromatization of a Substrate Analogue by a Peroxo Fe(III) Porphyrin ComplexDiana L. Wertz, Marlene F. Sisemore, Matthias Selke, Jennifer Driscoll, and Joan Selverstone ValentineView Author Information Department of Chemistr…
Porphyrin and Phthalocyanine ChemistryPorphyrin Metabolism and DisordersPhotosynthetic Processes and Mechanisms
B. A. Ivanov、H. J. Schnitzer、F. G. Mertens 等 4 位作者1998-05-14arXiv
We calculate the magnon modes in the presence of a vortex in a circular system, combining analytical calculations in the continuum limit with a numerical diagonalization of the discrete system. The magnon modes are expressed by the S-matrix for magnon-vortex scattering, as a function of the parameters and the size of…
Materials Science