Sébastien Kerisit、Stephen C. Parker2003-12-19Chemical Communications
Molecular dynamics simulations of the calcite-water interface have shown that the free energy of adsorption of water is relatively small compared to the previously calculated enthalpy of adsorption implying a large entropy change and that the free energy profile of a calcium adsorbing on the surface correlates with th…
Calcium Carbonate Crystallization and InhibitionMinerals Flotation and Separation TechniquesCrystallization and Solubility Studies
Rajendra R. Bhat、M. Tomlinson、Jan Genzer2003-12-19Macromolecular Rapid Communications
Abstract Summary: We report on preparing poly(2‐(dimethylamino)ethyl methacrylate) (PDMAEMA) gradient substrate, wherein molecular weight (MW) and grafting density ( σ ) of the surface‐anchored PDMAEMA chains vary continuously in two orthogonal directions. Such a specimen is used to control the assembly of charged gol…
Nanoparticle-Based Drug DeliveryGold and Silver Nanoparticles Synthesis and ApplicationsPolymer Surface Interaction Studies
Yanqin Wang、Bodo Zibrowius、Chia‐Min Yang 等 5 位作者2003-12-19Chemical Communications
Ordered mesoporous silicas SBA-15 with high loadings of pendant vinyl groups have been synthesized via co-condensation of tetraethoxysilane (TEOS) and triethoxyvinylsilane (TEVS) templated with a triblock copolymer.
Catalytic Processes in Materials ScienceMesoporous Materials and CatalysisPolyoxometalates: Synthesis and Applications
Takamitsu Fukuda、Е. А. Макарова、E. A. LUK'YANETS 等 4 位作者2003-12-19Chemistry - A European Journal
Benzene- or 2,3-naphthalene-ring-expanded tetraazachlorins (TACs), tetraazabacteriochlorins (TABCs), and tetraazaisobacteriochlorins (TAiBCs) have been synthesized by using tetramethylsuccinonitrile as a source of hydrogenated sites. The derived compounds were characterized by using NMR spectroscopy, X-ray crystallogr…
Photosynthetic Processes and MechanismsPorphyrin and Phthalocyanine ChemistryPhotodynamic Therapy Research Studies
Jun Terao、Andrew Tang、Jasper J. Michels 等 5 位作者2003-12-19Chemical Communications
PPV-based polyrotaxanes have been prepared by coupling vinyl boronic acids to aryl iodides in the presence of cyclodextrins, and the crystal structure of a [2]rotaxane of this type has been determined.
Supramolecular Chemistry and ComplexesPorphyrin and Phthalocyanine ChemistryLuminescence and Fluorescent Materials
N. Ott、M. Nerding、G. Müller 等 5 位作者2003-12-19Journal of Applied Physics
We investigate the structural changes in porous silicon multilayers during annealing. Porous silicon multilayers play an important role in layer transfer technologies, where a thin crystalline silicon layer is separated from a wafer and transferred to a foreign substrate. High processing temperatures during epitaxial…
Silicon and Solar Cell TechnologiesSilicon Nanostructures and PhotoluminescenceNanowire Synthesis and Applications
Luca Gregoratti、A. Barinov、E. Benfatto 等 11 位作者2003-12-19Review of Scientific Instruments
We show that it is possible to use a multichannel electron detector in a zone plate based photoemission spectromicroscopy in a snap shot mode to reduce the total acquisition time for a given counting time by 50% relative to the standard scanning mode while preserving the feature of the spectra. We describe the result…
Advancements in Photolithography TechniquesX-ray Spectroscopy and Fluorescence AnalysisElectron and X-Ray Spectroscopy Techniques
Myung‐Seok Choi、Tomoko Yamazaki、Iwao Yamazaki 等 4 位作者2003-12-19Angewandte Chemie
Abstract Jüngste Fortschritte bei Grundlagenstudien zu Multiporphyrinsystemen geben Aufschluss über die maßgeblichen Strukturparameter für das Molekulardesign von künstlichen Lichtsammelantennen, die die radähnlichen Antennenkomplexe photosynthetischer Purpurbakterien imitieren. “Kovalente” und “nichtkovalente” Ansätz…
Photosynthetic Processes and MechanismsSupramolecular Chemistry and ComplexesPorphyrin and Phthalocyanine Chemistry
Éric Rose、Qizhi Ren、Bruno Andrioletti2003-12-19Chemistry - A European Journal
A new chiral binaphthyl-strapped iron-porphyrin 4 b that exhibits unprecedented catalytic activity toward the enantioselective epoxidation of terminal olefins was synthesized. Typical enantiomeric excesses (ee) of 90 % were measured with a maximum of 97 % for the epoxidation of styrene, whereas the turnover numbers (T…
Porphyrin and Phthalocyanine ChemistryMetalloenzymes and iron-sulfur proteinsMetal-Catalyzed Oxygenation Mechanisms
Francesco Lufrano、P. Staiti、Maurizio Minutoli2003-12-19Journal of The Electrochemical Society
The effects of Nafion loading in electrodes on the performance of supercapacitors have been investigated in this work. Electrodes based on carbon material were prepared with Nafion loading varying from 10 to 50 wt %, and the optimal loading was investigated by electrochemical impedance spectroscopy. The capacitors wit…
Supercapacitor Materials and FabricationFuel Cells and Related MaterialsAdvanced battery technologies research
Xin Guo、Yong Ding2003-12-19Journal of The Electrochemical Society
According to the space charge concept, oxygen vacancies are depleted in the grain boundary space charge layers of acceptor-doped whereas electrons are expected to accumulate in the space charge layers if present, leading to significant changes in the grain boundary electrical properties. In this work, electrons were i…
Advancements in Solid Oxide Fuel CellsSemiconductor materials and devicesElectronic and Structural Properties of Oxides
Chunxiang Xu、Xiao Wei Sun、B. J. Chen 等 6 位作者2003-12-19Journal of Applied Physics
Nanostructural zinc oxide fibers have been fabricated by a simple vapor transport method of heating the mixture of zinc oxide, gallium oxide, and carbon powders in air. The zinc oxide nanofibers showed cauliflower-like, disordered, vertically and horizontally aligned morphologies in different temperature regions. The…
ZnO doping and propertiesGas Sensing Nanomaterials and SensorsGa2O3 and related materials
Sang Sub Kim、Jongun Moon、Byung‐Teak Lee 等 5 位作者2003-12-19Journal of Applied Physics
Heteroepitaxial growth behavior of Mn-doped ZnO thin films (Zn1−xMnxO) on Al2O3 (0001) substrates by pulsed laser deposition was investigated particularly as a function of Mn content (0.00⩽x⩽0.35) using synchrotron x-ray scattering and atomic force microscopy. The undoped ZnO film was grown epitaxially with a 30° rota…
ZnO doping and propertiesCopper-based nanomaterials and applicationsGa2O3 and related materials
Viola Birss、Shen Xia、R. Yue 等 4 位作者2003-12-19Journal of The Electrochemical Society
The characteristics of the oxide film formed on a Mg-based WE43 alloy using ac/dc anodization techniques in an alkaline silicate solution have been investigated using scanning electron microscopy and Rutherford back-scattering spectroscopy, and the corrosion resistance of these films has been determined using the ac i…
Corrosion Behavior and InhibitionConcrete Corrosion and DurabilityAnodic Oxide Films and Nanostructures
L. Lian、N. R. Sottos2003-12-19Journal of Applied Physics
Residual stress development during processing of sol-gel derived ferroelectric thin films influences electromechanical properties and performance. The present work investigates the effects of stress on field-induced polarization switching in ferroelectric Pb(Zr0.52Ti0.48)O3 (PZT) (52/48) thin films. Film response is m…
Ferroelectric and Piezoelectric MaterialsAcoustic Wave Resonator TechnologiesDielectric materials and actuators
Thomas F. Jaramillo、Sung‐Hyeon Baeck、Alan Kleiman‐Shwarsctein 等 4 位作者2003-12-19Macromolecular Rapid Communications
Abstract Summary: Automated electrochemical synthesis was used to create combinatorial libraries of mesoporous materials using tri‐block copolymers as structure directing agents (SDA). An example library of 56 ZnO samples was synthesized, varying concentrations (0–15 wt.‐%) of poly(ethylene oxide)‐block‐poly(propylene…
Advanced Photocatalysis TechniquesMesoporous Materials and CatalysisPolyoxometalates: Synthesis and Applications
Yutaka Matsuo、Ayako Muramatsu、Ryo Hamasaki 等 6 位作者2003-12-19Journal of the American Chemical Society
Hexagonal or tetragonal packing of columnar stacks in crystals and liquid crystals has been observed for a series of molecules possessing a fullerene apex and an aromatic cone that are connected with a Si-C connection. The columnar stacking of the new shuttlecock molecules is constitutionally stable but conformational…
Carbon Nanotubes in CompositesGraphene research and applicationsFullerene Chemistry and Applications
Hongzhi Wang、Xianying Li、Masato Uehara 等 8 位作者2003-12-19Chemical Communications
ZnS-coated CdSe composite particles have been continuously synthesized in a microfluidic reactor. By using this system, CdSe particles and a ZnS coating can be produced in sequence, and the particle size and layer thickness can be directly adjusted by the residence time. It demonstrated that the continuous synthesis i…
Gold and Silver Nanoparticles Synthesis and ApplicationsQuantum Dots Synthesis And PropertiesInnovative Microfluidic and Catalytic Techniques Innovation
Richard A. van Delden、Tommaso Mecca、Carlo Rosini 等 4 位作者2003-12-19Chemistry - A European Journal
Two new structurally related photoswitches are described, in which azobenzene photochromism is combined with the chirality of a 2,2'-dihydroxy-1,1'-binaphthyl unit. In system 1 the chiral binaphthyl moiety is bridged by a methylene tether, locking the biaryl chirality while in system 2 the biaryl core is unbridged and…
Porphyrin and Phthalocyanine ChemistryPhotochromic and Fluorescence ChemistryMolecular spectroscopy and chirality
Yu‐Chih Tseng、Peiqi Xuan、Ali Javey 等 7 位作者2003-12-19Nano Letters
An integrated circuit combining single-walled carbon nanotube (SWNT) devices with n-channel metal oxide semiconductor (NMOS) field effect transistors was fabricated. SWNTs were grown, using chemical vapor deposition, from catalyst islands located on an NMOS decoder circuit. Massive arrays of nanotube devices, each add…
Carbon Nanotubes in CompositesMechanical and Optical ResonatorsNanotechnology research and applications