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第 183511 / 191078 页 · 当前展示 3,670,201–3,670,220 / 3,821,557 条匹配结果 · 摘要仅作预览

Juliá-Colonna Asymmetric Epoxidation in a Continuously Operated Chemzyme Membrane Reactor

Svetlana B. Tsogoeva、Jens Wöltinger、Carsten Jost 等 7 位作者2002-01-01Synlett

Two novel soluble polymer-bound oligo-l-leucines 2 and 5, which can be retained by a membrane reactor system, have been prepared and used as catalysts for the continuously operated asymmetric epoxidation of chalcone. The optimized batch reaction conditions yield epoxychalcone in high enantioselectivities (up to 94%) a…

Electrochemical sensors and biosensorsEnzyme Catalysis and ImmobilizationPorphyrin and Phthalocyanine Chemistry

Interactions of H2O with SrTiO3(100) surfaces

Li‐Qiong Wang、Kim F. Ferris、G. S. Herman2002-01-01Journal of Vacuum Science & Technology A Vacuum Surfaces and Films

Interactions of H2O with SrTiO3(100) surfaces were investigated using temperature-programed desorption (TPD) spectroscopy. TPD spectra show that water desorbs below 300 K on stoichiometric TiO2–terminated SrTiO3(100) surfaces. TPD features at 200–300 K are attributed to the nondissociative adsorption of H2O on cation…

Advancements in Solid Oxide Fuel CellsMagnetic and transport properties of perovskites and related materialsElectronic and Structural Properties of Oxides

Photodynamic Properties of Amphiphilic Derivatives of Aluminum Tetrasulfophthalocyanine¶

Cynthia M. Allen、Réjean Langlois、Wesley M. Sharman 等 5 位作者2002-01-01Photochemistry and Photobiology

Photodynamic therapy (PDT) is a promising treatment modality that has recently been accepted in clinics as a curative or palliative therapy for cancer and other nonmalignant conditions. Phthalocyanines (Pc) are attractive photosensitizers for PDT because of their enhanced photophysical and photochemical properties. Th…

Nanoplatforms for cancer theranosticsPorphyrin and Phthalocyanine ChemistryPhotodynamic Therapy Research Studies

Bottom-up Filling of Submicrometer Features in Catalyst-Enhanced Chemical Vapor Deposition of Copper

Kew-Chan Shim、Hyun-Bae Lee、Oh-Kyum Kwon 等 6 位作者2002-01-01Journal of The Electrochemical Society

A formation process for copper bottom-up filling of submicrometer via holes and trenches using iodine as a catalytic surfactant and hexafluoroacetylacetonate-copper-vinyltrimethylsilane in catalyst-enhanced chemical vapor deposition of copper is presented. The film growth rate of copper at the bottom of the submicrome…

Semiconductor materials and devicesAdvanced Surface Polishing TechniquesCopper Interconnects and Reliability

Fast x-ray scattering measurements on molten alumina using a 120° curved position sensitive detector

Louis Hennet、Dominique Thiaudière、M. Gailhanou 等 6 位作者2002-01-01Review of Scientific Instruments

Fast x-ray scattering measurements on molten alumina were performed on the H10 beam line at the DCI Synchrotron of LURE (Orsay, France). A high-temperature chamber with a levitation device was coupled with the four-circle goniometer of the beam line. A 100 W CO2 laser was used to melt the sample and the temperature wa…

High-pressure geophysics and materialsX-ray Spectroscopy and Fluorescence AnalysisX-ray Diffraction in Crystallography

A novel organometallic columnar complex containing endohedral silver( i )–ethynediyl binding and exterior silver( i )–aromatic interaction

Quan‐Ming Wang、Thomas C. W. Mak2002-01-01Chemical Communications

Unprecedented eta 3 pi-donor behavior of the benzyltrimethy-lammonium ion is observed in the polymeric silver(I) complex [(PhCH2NMe3)Ag7(C2)(CF3CO2)6]n that comprises a columnar backbone constructed from the fusion of Ag8 square antiprisms each enclosing an acetylide dianion.

Molecular Sensors and Ion DetectionMagnetism in coordination complexesPorphyrin and Phthalocyanine Chemistry

Direct‐Write Fabrication of Zinc Oxide Varistors

Valeria Tohver、Sherry L. Morissette、Jennifer A. Lewis 等 6 位作者2002-01-01Journal of the American Ceramic Society

Zinc oxide (ZnO)‐based pastes with tailored rheological properties have been developed for direct‐write fabrication of thick‐film varistor elements in highly integrated, multifunctional electroceramic devices. Such pastes exhibited pseudoplastic behavior with a low shear apparent viscosity of roughly 1 × 10 4 Pa·s. Up…

Ferroelectric and Piezoelectric MaterialsMicrowave Dielectric Ceramics SynthesisElectrical and Thermal Properties of Materials

Theoretical Study on the Chemistry of Intergranular Glassy Film in Si 3 N 4 –SiO 2 Ceramics

Masato Yoshiya、K. Tatsumi、Isao Tanaka 等 4 位作者2002-01-01Journal of the American Ceramic Society

The intergranular glassy film (IGF) composed of silicon oxynitride in a Si 3 N 4 ceramic material has been studied by molecular dynamics calculations. Structural analyses showed that the presence of an IGF having both nitrogen and oxygen reduces the number of dangling bonds at the junction between the IGF and adjacent…

Advanced ceramic materials synthesisSemiconductor materials and devicesGlass properties and applications

Theoretical investigation of the spin crossover transition states of the addition of methane to a series of Group 6 metallocenes using minimum energy crossing points

Jennifer C. Green、Jeremy N. Harvey、Rinaldo Poli2002-01-01Journal of the Chemical Society Dalton Transactions

Density functional calculations are reported on the addition of methane to Group 6 metallocenes, M(η-C5H5)2 (M), M(CH2(η-C5H4)2) (a-M) and M(η-C5Me5)2 (M*) where M = Mo and W. Full geometry optimisations were carried out on the singlet and triplet 16 electron complexes, 1[M] and 3[M], the η2-methane complexes, 1[M(η2-…

Advanced Chemical Physics StudiesMagnetism in coordination complexesMolecular Junctions and Nanostructures

Electrochemical Characterization of Polyacetylene Ionomers and Polyelectrolyte-Mediated Electrochemistry toward Interfaces between Dissimilarly Doped Conjugated Polymers

Mark C. Lonergan、Calvin H. W. Cheng、Brandi L. Langsdorf 等 4 位作者2002-01-01Journal of the American Chemical Society

The electrochemical characterization of thin films of the ionically functionalized polyacetylene analogues poly(tetramethylammonium 2-cyclooctatetraenylethanesulfonate) (P(A)) and poly[(2-cyclooctatetraenylethyl)trimethylammonium trifluoromethanesulfonate] (P(C)) is reported along with an electrochemical approach to t…

Conducting polymers and applicationsElectrochemical Analysis and ApplicationsAnalytical Chemistry and Sensors

Strong intramolecular chromophore interactions in novel bis([60]fullerene)–oligoporphyrin nanoarrays

Davide Bonifazi、François Diederich2002-01-01Chemical Communications

Novel nanodimensional dyads were prepared by Bingel reaction of meso, meso-linked oligoporphyrin bis-malonates with C60. Distinct conformational effects were observed as a result of strong fullerene-porphyrin interactions, which also lead to efficient quenching of the porphyrin luminescence.

Graphene research and applicationsPorphyrin and Phthalocyanine ChemistryFullerene Chemistry and Applications

Red and near-infrared photoluminescence from silica-based nanoscale materials: Experimental investigation and quantum-chemical modeling

A. S. Zyubin、Yu. D. Glinka、Alexander M. Mebel 等 6 位作者2002-01-01The Journal of Chemical Physics

Experimental study of room temperature photoluminescence (PL) from silica nanoparticles and mesoporous silicas induced by ultraviolet and visible laser light (λEXC=266 and 532 nm or 4.66 and 2.33 eV, respectively) reveals several well-defined PL bands in the red- and near-infrared spectral range, which are peaked at 1…

Luminescence Properties of Advanced MaterialsGlass properties and applicationsSilicon Nanostructures and Photoluminescence

Effects of Oxygen Partial Pressure and Annealing Temperature on the Formation of Sputtered Tungsten Oxide Films

Carla Bittencourt、Richard Landers、Eduard Llobet 等 8 位作者2002-01-01Journal of The Electrochemical Society

Thin films of tungsten oxide were deposited on silicon substrates using reactive radio frequency sputtering. The structure of the films strongly depends on the conditions of deposition and post-treatment. Important issues are the influences of oxygen pressure during deposition and annealing temperature on the morpholo…

ZnO doping and propertiesGas Sensing Nanomaterials and SensorsTransition Metal Oxide Nanomaterials

Fabrication of Fine-grained High Nitrogen Austenitic Steels through Mechanical Alloying Treatment.

Toshihiro Tsuchiyama、Hiroyuki Uchida、Kouta Kataoka 等 4 位作者2002-01-01ISIJ International

Mechanical alloying (MA) treatment was applied for the fabrication of fine-grained high nitrogen stainless steels. Chromium nitride (Cr2N) powder was mixed with Fe-Cr binary alloy powder to control its mean chemical composition to be Fe-23mass%Cr-1mass%N which is enough to stabilize austenitic structure at room temper…

Metal and Thin Film MechanicsMicrostructure and Mechanical Properties of SteelsMetal Alloys Wear and Properties

[Mn 2 (bipym)(H 2 O) 8 ] 4+ and [Fe(bipy)(CN) 4 ] − as building blocks in designing novel bipym- and cyanide-bridged heterobimetallic complexes (bipym = 2,2′-bipyrimidine and bipy = 2,2′-bipyridine)

Luminita Marilena Toma、Rodrigue Lescouëzec、Liviu Toma 等 7 位作者2002-01-01Journal of the Chemical Society Dalton Transactions

Two new cyano complexes, K[Fe(bipy)(CN)4]·H2O (1) and (μ-bipym)[Mn(H2O)3{Fe(bipy)(CN)4}]2[Fe(bipy)(CN)4]2·12H2O (2), have been synthesised and their structures determined by single-crystal X-ray diffraction. Complex 1 is made up of mononuclear [Fe(bipy)(CN)4]− anions, potassium cations and water molecules of crystalli…

Metal-Organic Frameworks: Synthesis and ApplicationsMetal complexes synthesis and propertiesMagnetism in coordination complexes

Silica–alumina catalysts prepared in sol–gel process of TEOS with organic additives

Miyuki Yabuki、Ryōji Takahashi、Satoshi Sato 等 5 位作者2002-01-01Physical Chemistry Chemical Physics

Amorphous silica–alumina catalysts were prepared in the sol–gel reaction of tetraethoxysilane in the presence of aluminium nitrate and various organic additives, and the effects of the additives on both pore formation and acid-site generation were investigated. Macropores with bicontinuous morphology are formed in the…

Zeolite Catalysis and SynthesisMesoporous Materials and CatalysisMembrane Separation and Gas Transport

Optical rotation in RbTiOAsO4(point groupmm2)

Werner Kaminsky、P. A. Thomas、A. M. Glazer2002-01-01Zeitschrift für Kristallographie - Crystalline Materials

Abstract Measurement of optical rotation in RbTiOAsO 4 (RTA) with the tilter method resulted in an optical rotation of ρ 12 = +17(3) o /mm at a wavelength of 670nm, when a (100) sample was tilted about [001]. A tilt about [010] showed no rotation, as expected from the directional dependence of optical rotation calcula…

Crystal Structures and PropertiesPhotorefractive and Nonlinear OpticsMolecular spectroscopy and chirality

Synthesis and characterization of poly(methyl silsesquioxane)–titania optical thin films

Wen‐Chang Chen、Long‐Hua Lee、Bofu Chen 等 4 位作者2002-01-01Journal of Materials Chemistry

Poly(methyl silsesquioxane) (MSQ)–titania optical thin films were synthesized and characterized in this study. An MSQ precursor with a mixed cage and network structure was prepared first, which had end groups of Si–OH and Si–OCH3. Then, it was reacted with titanium(IV) n-butoxide, followed by spin-coating and multi-st…

Advanced Surface Polishing TechniquesCopper Interconnects and ReliabilitySilicone and Siloxane Chemistry

Study on δ-Form Complex in a Syndiotactic Polystyrene/Organic Molecules System, 1. Preferential Complexing Behavior of Xylene Isomers

M. Sivakumar、Yusuke Yamamoto、Devaraj Amutharani 等 6 位作者2002-01-01Macromolecular Rapid Communications

To investigated the preferential complexing behavior of isomeric xylenes, syndiotactic polystyrene (sPS) membranes are prepared using varying compositions of p- and m-xylene. Complex formation between sPS and xylenes was studied by means of thermogravimetric and FT-IR analyses to determine the exact amounts of solvent…

Polymer crystallization and properties

Chemical Limitations of Macropore Formation on Medium-Doped p-Type Silicon

S. Lust、Claude Lévy‐Clément2002-01-01Journal of The Electrochemical Society

A systematic study of the influence of the nature of organic electrolytes on the formation and morphology of the macropores obtained on various medium- and low-doped p-type silicon samples (15-0.015 Ω cm) during anodization is presented. Optimizing the HF/organic solution composition allows extension of the limit of m…

Semiconductor materials and devicesSilicon Nanostructures and PhotoluminescenceNanowire Synthesis and Applications