Wing-Yin Lo、Chi-Ho Lam、Vivian Wing‐Wah Yam 等 10 位作者2004-05-20Journal of the American Chemical Society
A series of soluble trinuclear copper(I) and silver(I) complexes containing bicapped diynyl ligands, [M(3)(micro-dppm)(3)(micro(3)-eta(1)-C triple bond CC triple bond CR)(2)]PF(6) (M = Cu, R = Ph, C(6)H(4)-CH(3)-p, C(6)H(4)-OCH(3)-p, (n)C(6)H(13), H; M = Ag, R = Ph, C(6)H(4)-OCH(3)-p), has been synthesized and their e…
Organometallic Complex Synthesis and CatalysisFluorine in Organic ChemistryMagnetism in coordination complexes
Uri Raviv、Susan Perkin、Pierre Laurat 等 4 位作者2004-05-20Langmuir
A surface force balance with extremely high sensitivity and resolution for measuring shear forces across thin films has been used to investigate directly the dynamic properties of salt-free water (so-called conductivity water) in a gap between two atomically smooth solid surfaces. Our results reveal that no shear stre…
nanoparticles nucleation surface interactionsForce Microscopy Techniques and ApplicationsMaterial Dynamics and Properties
Ulas Coskun、Tzu-Chieh Wei、Smitha Vishveshwara 等 5 位作者2004-05-20Science
We report experiments on quantum dot single-electron-tunneling (SET) transistors made from short multiwall nanotubes and threaded by magnetic flux. Such systems allow us to probe the electronic energy spectrum of the nanotube and its dependence on the magnetic field. Evidence is provided for the interconversion betwee…
Quantum and electron transport phenomenaGraphene research and applicationsCarbon Nanotubes in Composites
Andrés Vega、Jean‐Yves Saillard2004-05-20Inorganic Chemistry
DFT calculations on Cu(4)(mu3-X)4L4 (X = H, CH(3), CCH, F, Cl, Br, I; L = NH(3), PH(3)) indicate that, regardless of its nature, X- acts essentially as a two-electron sigma-type ligand and that the covalent part of the Cu...Cu bonding depends mainly upon the a1 component of the orbital interaction between the L4Cu4(4+…
Nanocluster Synthesis and ApplicationsMagnetism in coordination complexesOrganometallic Complex Synthesis and Catalysis
Sampyo Hong、Abdelkader Kara、Talat S. Rahman 等 5 位作者2004-05-20arXiv
We have calculated the surface stress induced on adsorption of c(2x2) overlayers of O and C, using first principles electronic structure calculations based on density functional theory within the local density approximation(LDA) and non-local pseudopotentials. Most remarkable result is found in the case of the C overl…
Materials Science
Yongqiang Xue、Mark A. Ratner2004-05-20arXiv
We analyze non-equilibrium current transport in molecular electronic devices, using as an example devices formed by two terphenyl dithiol molecules attached to gold electrodes. Using a first-principles based self-consistent matrix Green's function method, we show that the spatially resolved current density profiles an…
Materials ScienceMesoscale and Nanoscale Physics
Haruhiko Udono、Isao Kikuma、Tsuyoshi Okuno 等 5 位作者2004-05-20arXiv
We investigated optical absorption spectra near the fundamental absorption edge of beta-FeSi2 single crystals by transmission measurements. The phonon structure corresponding to the emission and absorption component was clearly observed in the low-temperature absorption spectra. Assuming exciton state in the indirect…
Materials Science
H. F. Tian、H. C. Yu、X. H. Zhu 等 7 位作者2004-05-20arXiv
Epitaxial Ba0.5Sr0.5TiO3 thin films grown on the (001) LaAlO3 substrates with the ferroelectric transition of about 250K have been investigated by TEM and off-axis electron holography. Cross-sectional TEM observations show that the 350nm-thick Ba0.5Sr0.5TiO3 film has a sharp interface with notable misfit dislocations.…
Materials ScienceStrongly Correlated Electrons
S. Piskunov、E. A. Kotomin、E. Heifets2004-05-20arXiv
We present the results of first-principles calculations on two possible terminations of the (001) surfaces of SrTiO3 (STO), BaTiO3 (BTO), and PbTiO3 (PTO) perovskite crystals. Atomic structure and the electronic configurations were calculated for different 2D slabs, both stoichiometric and non-stoichiometric, using hy…
Materials Science
A. L. Efros2004-05-20arXiv
I estimate maximum thermal conductivity $κ$ of a perfectly aligned bundle of single wall carbon nanotubes. Each row of aligned nanotubes has a discrete structure. It consists of segments of nanotubes with length $L$. The spacing between the segments block the phonon path through the row. Only the scattering due to the…
Materials Science
Zhiwei Hu、Hua Wu、M. W. Haverkort 等 13 位作者2004-05-20Physical Review Letters
Using soft-x-ray absorption spectroscopy at the Co L(2,3) and O K edges, we demonstrate that the Co3+ ions with the CoO5 pyramidal coordination in the layered Sr2CoO3Cl compound are unambiguously in the high spin state. Our result questions the reliability of the spin state assignments made so far for the recently syn…
Advanced Condensed Matter PhysicsThermal Expansion and Ionic ConductivityMagnetic and transport properties of perovskites and related materials
Matthias Bartholmai、Bernhard Schartel2004-05-20Polymers for Advanced Technologies
Abstract Polymeric nanocomposites are discussed as one of the most promising advanced materials whose nanoscale effects can be exploited for industry. Layered silicate polypropylene‐graft‐maleic anhydride nanocomposites are investigated as a model to clarify the potential of such materials in terms of fire retardancy.…
Flame retardant materials and propertiesPolymer crystallization and propertiesPolymer Nanocomposites and Properties
S. Zaric、G. N. Ostojic、Junichiro Kono 等 9 位作者2004-05-20OpenAlex
We report interband magneto-optical spectra for single-walled carbon nanotubes in high magnetic fields up to 45 tesla, confirming theoretical predictions that the band structure of a single-walled carbon nanotube is dependent on the magnetic flux phi threading the tube. We have observed field-induced optical anisotrop…
Carbon Nanotubes in CompositesMechanical and Optical ResonatorsGraphene research and applications
Hashem Sharghi、Alireza Hassani Nejad2004-05-19ChemInform
Abstract For Abstract see ChemInform Abstract in Full Text.
Porphyrin and Phthalocyanine ChemistryFluorine in Organic ChemistryMarine Toxins and Detection Methods
Manal Issa、Maria José Abreu、Laurence Schacher 等 5 位作者2004-05-19European Journal of Applied Physiology
Surgical clothing and sheets have to meet all the requirements set in the health-care industry regarding body comfort, absorption capacity and general recognition of physiological safety and sterilisation capacity. The disposable surgical gown market is growing and the demand will increase in all product groups and ma…
Additive Manufacturing and 3D Printing TechnologiesThermoregulation and physiological responsesTextile materials and evaluations
Kunio Kimura、Ai Nishichi、Yuhiko Yamashita2004-05-19Polymers for Advanced Technologies
Abstract Novel thermally crosslinkable fluorine‐containing poly(arylene ether ketone)s comprised of 2,3,5, 6‐tetrafluoro‐1,4‐phenylene moiety were synthesized by the termination of polymer chain ends with propargyl ether groups in order to improve solvent resistance. Crosslinking reaction occurred over 250°C through t…
Synthesis and properties of polymers
A. Srinivasan、Tomoya Ishizuka、Hiromitsu Maeda 等 4 位作者2004-05-19Angewandte Chemie
Umgedreht: Die [3+2]-Kupplung von invertiertem Tripyrran und invertiertem Dipyrromethandicarbinol mit anschließender Oxidation führt zu Pentafluorphenyl-substituierten, doppelt N-invertierten Oxopentaphyrinen (siehe Struktur im Kristall; grün F, blau N, rot O). Die Oxopyrrol-Einheiten bilden leicht intra- und intermol…
Porphyrin and Phthalocyanine ChemistryPorphyrin Metabolism and DisordersSupramolecular Chemistry and Complexes
İbrahi̇m Erol2004-05-19Journal of Polymer Science Part A Polymer Chemistry
Abstract A new type of methacrylate monomer, [2‐oxo‐2‐(4‐acetyl) phenyl amino] ethylene methacrylate (APEMA), was synthesized. The oxime, 2,4‐dinitrophenylhydrazone, and thiosemicarbazone derivatives of poly{[2‐oxo‐2‐(4‐acetyl) phenyl amino] ethylene methacrylate} [poly(APEMA)] were prepared with hydroxylamine hydroch…
Synthesis and properties of polymersInorganic and Organometallic ChemistryThermal and Kinetic Analysis
Patrick Hogan、Todd Stefanik、Charles B. Willingham 等 4 位作者2004-05-19Defense Technical Information Center (DTIC)
Yttria (Y2O3) has excellent optical performance through the full mid wavelength infrared (MWIR) atmospheric transmission band at both ambient and elevated temperatures. Current state-of-the-art yttria's thermomechanical properties are adequate for a number of IR window and dome applications, but only marginal for the…
Energetic Materials and CombustionHigh-pressure geophysics and materialsAdvanced ceramic materials synthesis
V. V. Ursaki、I. M. Tiginyanu、V.V. Zalamai 等 7 位作者2004-05-19Semiconductor Science and Technology
The emission from ZnO layers grown on the surface of bulk opals using chemical deposition is studied under excitation by the 351.1 nm line of an Ar + laser at different excitation power densities and temperatures. The emission spectrum exhibits narrow photoluminescence (PL) bands associated with the recombination of b…
Chalcogenide Semiconductor Thin FilmsQuantum Dots Synthesis And PropertiesZnO doping and properties