Thomas Rüther、Victoria M. Hultgren、Brian P. Timko 等 6 位作者2003-07-24Journal of the American Chemical Society
Oxidative photocurrents measured upon irradiation by a 7-W visible light (wavelength 312-700 nm) demonstrated that the sulfo-polyoxometalate anion clusters [S2W18O62]4- (1a), [S2Mo18O62]4- (1b), and [SMo12O40]2- (2) may be activated photochemically to oxidize the organic substrates benzyl alcohol, ethanol, and (-)-men…
Polyoxometalates: Synthesis and ApplicationsChemical Synthesis and ReactionsAdvanced Nanomaterials in Catalysis
Sébastian Bareyt、Stergios Piligkos、Bernold Hasenknopf 等 7 位作者2003-07-24Angewandte Chemie International Edition
Making derivatives of organic side chains on polyoxometalates is an important prerequisite for their application in biology. Compounds α1- and α2-[P2W17O61{Sn(CH2)2CO2H}]7− (depicted) were prepared for the first time and coupled with alcohols and amines, including C-protected amino acids.
Metal-Organic Frameworks: Synthesis and ApplicationsPolyoxometalates: Synthesis and ApplicationsVanadium and Halogenation Chemistry
Hiroshi Ono、Akira Emoto、Fumihiro Takahashi 等 5 位作者2003-07-24Journal of Applied Physics
Highly stable polarization gratings have been prepared in photocrosslinkable polymer liquid-crystal films by the use of two orthogonally polarized He–Cd laser beams and subsequent annealing. The resulting pure polarization gratings exhibiting thermal stability up to 150 °C diffract the beam and convert the polarizatio…
Liquid Crystal Research AdvancementsAdvanced Fiber Laser TechnologiesPhotorefractive and Nonlinear Optics
Minoru Fujii、Kimiaki Toshikiyo、Yuji Takase 等 5 位作者2003-07-24Journal of Applied Physics
Photoluminescence (PL) properties of heavily P- and B-doped Si nanocrystals (nc-Si) are studied. By simultaneously doping two types of impurities, nc-Si exhibit strong PL at around 0.9 eV at room temperature. The temperature quenching of the PL is very small. Although the PL peak energy is very close to that of dangli…
Semiconductor materials and devicesSilicon Nanostructures and PhotoluminescenceSemiconductor materials and interfaces
Natasha Erdman、Oliver Warschkow、Mark Asta 等 6 位作者2003-07-24Journal of the American Chemical Society
We report the solution of the c(4 x 2) reconstruction of SrTiO(3) (001), obtained through a combination of high-resolution transmission electron microscopy, direct methods analysis, and density functional theory. The structure is characterized by a single overlayer of TiO(2) stoichiometry in which TiO(5) polyhedra are…
Ferroelectric and Piezoelectric MaterialsMagnetic and transport properties of perovskites and related materialsElectronic and Structural Properties of Oxides
L. Petit、A. Svane、Z. Szotek 等 4 位作者2003-07-24Science
The electronic structure of PuO(2+/-x) was studied using first-principles quantum mechanics, realized with the self-interaction corrected local spin density method. In the stoichiometric PuO2 compound, Pu occurs in the Pu(IV) oxidation state, corresponding to a localized f4 shell. If oxygen is introduced onto the octa…
Radioactive element chemistry and processingNuclear Materials and PropertiesNuclear materials and radiation effects
Naoya Hosoda、Ayae Sugawara‐Narutaki、Takashi Kato2003-07-24Macromolecules
Aragonite thin films of calcium carbonate are selectively formed on crystalline poly(vinyl alcohol) matrices in the presence of poly(acrylic acid) in CaCO 3 solution. For thin film formation, this is the first example in which aragonite is formed selectively by cooperation of only synthetic organic macromolecules. In…
biodegradable polymer synthesis and propertiesPolymer composites and self-healingCalcium Carbonate Crystallization and Inhibition
Wei Wu、Shuang Zhang、Yong Li 等 10 位作者2003-07-24Macromolecules
SWNTs are among the most attractive one-dimen-sional materials in the scientific world. Recently, con-siderable work has been done to modify SWNTs in order to bring these fascinating carbon structures into the fold of (macro)molecular chemistry and to endow SWNTs with ultimate new characteristics.1 The polymer wrap-pi…
Organic Electronics and PhotovoltaicsCarbon Nanotubes in CompositesConducting polymers and applications
Huaqiang Cao、Xianqing Qiu、Liang Yu 等 5 位作者2003-07-24Applied Physics Letters
Semiconductor In2O3 nanowires embedded in an alumina template were fabricated using template technology. Scanning electron microscopy and transmission electron microscopy observations show that the In2O3 nanowire single crystal has an average diameter around 80 nm and a length over 10 μm. A strong photoluminescence (P…
ZnO doping and propertiesGas Sensing Nanomaterials and SensorsNanowire Synthesis and Applications
R. Thayer、Clive A. Randall、Susan Trolier‐McKinstry2003-07-24Journal of Applied Physics
Thin films were fabricated via metalorganic decomposition methods with three compositions: Bi1.5Zn1.0Nb1.5O7, Bi1.5Zn0.5Nb1.5O6.5, and Bi2Zn2/3Nb4/3O7. The Bi1.5Zn0.5Nb1.5O6.5 composition is a low temperature phase with the cubic pyrochlore structure. This phase may undergo a peritectoid decomposition at 700 °C to the…
Ferroelectric and Piezoelectric MaterialsMicrowave Dielectric Ceramics SynthesisNuclear materials and radiation effects
Aline Percot、Christophe Viton、Alain Domard2003-07-24Biomacromolecules
The aim of this paper was to contribute to the interpretation of the mechanism of shrimp shell deproteinization. We used amino acid analysis to quantify the amount of proteins remaining in chitin. NaOH 1 M was added to a demineralized shrimp shell powder with a solution-to-solid ratio of 15 mL/g at ambient temperature…
Nanocomposite Films for Food PackagingProtein Hydrolysis and Bioactive PeptidesSilk-based biomaterials and applications
Nguyen Que Huong、Joseph L. Birman2003-07-24arXiv
We consider the effect of an extra electron injected into a doped quantum dot $ZnS:Mn^{2+}$. The Coulomb interaction and the exchange interaction between the extra electron and the states of the Mn ion will mix the wavefunctions, split the impurity energy levels, break the previous selection rules and change the trans…
Mesoscale and Nanoscale PhysicsMaterials Science
Gordon R. Johnson、Timothy J. Holmquist、Stephen R. Beissel2003-07-24Journal of Applied Physics
This article contains a description of a computational constitutive model for brittle materials subjected to large strains, high strain rates, and high pressures. The focus of this model is to determine the response of aluminum nitride under high velocity impact conditions that produce large strains, high strain rates…
High-pressure geophysics and materialsEnergetic Materials and CombustionHigh-Velocity Impact and Material Behavior
Graeme J. Ackland、Xiangyang Huang、Karin M. Rabe2003-07-24arXiv
We apply the pseudopotential density functional perturbation theory approach along with the quasiharmonic approximation to calculate the thermal expansion of tungsten and two important metallic alloys, NiAl and PdTi. We derive the theory for anisotropic crystal structures and test the approximation that the anisotropi…
Materials Sciencecond-mat.stat-mech
Michele Lazzeri、Francesco Mauri2003-07-24arXiv
We present a simple formalism for the calculation of the derivatives of the electronic density matrix at any order, within density functional theory. Our approach, contrary to previous ones, is not based on the perturbative expansion of the Kohn-Sham wavefunctions. It has the following advantages: (i) it allows a simp…
Materials Science
S. R. Schofield、N. J. Curson、M. Y. Simmons 等 7 位作者2003-07-24arXiv
We demonstrate the controlled incorporation of P dopant atoms in Si (001) presenting a new path toward the creation of atomic-scale electronic devices. We present a detailed study of the interaction of PH3 with Si (001) and show that it is possible to thermally incorporate P atoms into Si (001) below the H desorption…
Materials Science
O. Yaroshchuk、Alexei D. Kiselev、Yu. Zakrevskyy 等 7 位作者2003-07-24Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
We apply experimental technique based on the combination of methods dealing with principal refractive indices and absorption coefficients to study the photoinduced three-dimensional (3D) orientational order in the films of liquid crystalline (LC) azopolymers. The technique is used to identify 3D orientational configur…
Liquid Crystal Research AdvancementsNonlinear Optical Materials ResearchOptical Polarization and Ellipsometry
Jun Chen、Shaozhi Deng、Ning Xu 等 6 位作者2003-07-24Applied Physics Letters
Films of aligned cupric oxide nanobelts have been prepared in an aqueous solution at room temperature. Field-emission characteristics, including emission-current–applied-field plot and emission site distribution, have been studied using the transparent anode technique. In addition, the temperature dependence of the fi…
ZnO doping and propertiesNanowire Synthesis and ApplicationsCopper-based nanomaterials and applications
Alfons van Blaaderen2003-07-24Science
About a hundred years ago, Jean Perrin's experiments on colloids—particles a few nanometers to a few micrometers in diameter—convinced even the skeptics that matter consists of atoms and molecules. More recently, the analogy between atoms and colloids has led to insights into crystal nucleation and growth, the glass t…
Proteins in Food SystemsSurfactants and Colloidal SystemsPickering emulsions and particle stabilization
Tetsuya Tohei、H. Wada、T. Kanomata2003-07-24Journal of Applied Physics
The magnetocaloric effect of Mn3GaC, which shows an antiferromagnetic to ferromagnetic transition at 165 K has been investigated. In this compound, magnetocaloric effect obtained at the transition is opposite to that of ordinary ferromagnetic systems, namely, negative magnetocaloric effect. It was found that a large m…
Magnetic and transport properties of perovskites and related materialsMXene and MAX Phase MaterialsThermal Expansion and Ionic Conductivity