Steven M. LeCours、Charles M. Phillips、Julio C. de Paula 等 4 位作者1997-12-01Journal of the American Chemical Society
symmetric [5,15-bis[(4'-nitrophenyl)ethynyl]-10,20-diphenylporphinato]copper(II) (I) and electronically asymmetric [5-[4'-(dimethylamino)phenyl]ethynyl]-15-[(4''-nitrophenyl)ethynyl]-10,20-diphenylporphinato]copper(II) (II), which bears both electron-releasing and electron-withdrawing groups conjugated directly to the…
Metal complexes synthesis and propertiesMagnetism in coordination complexesPorphyrin and Phthalocyanine Chemistry
Olivier Noiset、Yves‐Jacques Schneider、Jacqueline Marchand‐Brynaert1997-12-01Journal of Polymer Science Part A Polymer Chemistry
Using the wet-chemistry technique, we selectively reduced the surface of the PEEK film (PEEK-OH), and covalently fixed hexamethylene diisocyanate by addition onto the hydroxyl functions. The resulting PEEK-NCO film displayed free isocyanate termini, the basic hydrolysis of which gave the PEEK-NH2 film in 85% extent of…
Advanced Sensor and Energy Harvesting Materialsbiodegradable polymer synthesis and propertiesSynthesis and properties of polymers
Rosa Vargas-Poussou、Lionel Forestier、M D Dautzenberg 等 6 位作者1997-12-01Journal of the American Society of Nephrology
Congenital nephrogenic diabetes insipidus (CNDI) is a rare inherited disorder characterized by renal tubular insensitivity to the antidiuretic effect of arginine vasopressin (AVP). In a large majority of the cases, nephrogenic diabetes insipidus is an X-linked recessive disorder caused by mutations in the AVP V2 recep…
Ion Transport and Channel RegulationHydrogen Storage and MaterialsElectrolyte and hormonal disorders
J.‐P. Rivera、H. Schmid1997-12-01Ferroelectrics
The birefringence dispersion of a ferroelastic single domain of magnetoelectric BiFeO3 crystal has been measured at room temperature (24°C) in the rhombohedral phase. A thin (11μm) (110)cubic cut was used although it was not a principal cut. The optical axis (and spontaneous polarization) formed an angle of 35° with t…
Ferroelectric and Piezoelectric MaterialsMultiferroics and related materialsMagneto-Optical Properties and Applications
Sung-Cheng Hu、Yu-Wen Chen1997-12-01Industrial & Engineering Chemistry Research
The partial hydrogenation of benzene to cyclohexene at 2.34−5.10 MPa of hydrogen, 125−175 °C, was studied over Ru catalysts supported on lanthanum and zinc binary oxides with various atomic ratios in a stirred autoclave and in the presence of an aqueous sodium hydroxide solution. Due to the very small particle size of…
Catalytic Processes in Materials ScienceCatalysts for Methane ReformingCatalysis and Hydrodesulfurization Studies
R. Kiebooms、А. Н. Алешин、Katherine A. Hutchison 等 4 位作者1997-12-01The Journal of Physical Chemistry B
Structure and electrophysical properties of poly(3,4-ethylenedioxythiophene) (PEDOT) films electrochemically doped with PF 6 -, BF 4 -, and CF 3 SO 3 - have been studied. According to SEM and XRD studies, doped PEDOT films have amorphous fibrillar structure. Thermal studies show that continuous degradation occurs abov…
Organic Electronics and PhotovoltaicsConducting polymers and applicationsSemiconductor materials and interfaces
Adrian H. Elcock、Gary Huber、J. Andrew McCammon1997-12-01Biochemistry
Recent simulation work has indicated that channeling of charged substrates between the active sites of bifunctional enzymes or bienzyme complexes can be significantly enhanced by favorable interactions with the electrostatic field of the enzymes. The results of such simulations are expressed in terms of transfer effic…
Protein Structure and DynamicsEnzyme Structure and FunctionBiochemical and Molecular Research
C. Mosser、Laurent J. Michot、F. Vlllieras 等 4 位作者1997-12-01Clays and Clay Minerals
Abstract Two clay minerals, a dioctahedral, Na-montmorillonite from Wyoming and a trioctahedral, synthetic Na-laponite, were exchanged by cupric (Cu(II)) ions and subsequently heated at 100 °C intervals up to 500 °C. The resulting materials were analyzed by chemical analysis, X-ray diffraction (XRD), cation exchange c…
Clay minerals and soil interactionsIron oxide chemistry and applicationsChemical Synthesis and Characterization
Antonio Montalbán、Steven J. Lange、L. Scott Beall 等 8 位作者1997-12-01The Journal of Organic Chemistry
Linstead macrocyclization of dinitrile 1 gave [octakis(dimethylamino)porphyrazinato]magnesium(II) 2 and the seco-porphyrazine 4 from adventitious oxidation. The structure of the latter has been unequivocally established by an X-ray crystallographic study. Alternatively, compound 4 was obtained in high yield from the m…
Magnetism in coordination complexesPorphyrin and Phthalocyanine ChemistryPorphyrin Metabolism and Disorders
Glenn H. Fredrickson、Frank S. Bates1997-12-01Journal of Polymer Science Part B Polymer Physics
Recent experiments suggest that thermodynamically stable, bicontinuous microemulsions can be achieved in symmetric ternary blends of two homopolymers and a diblock copolymer by formulating alloys with compositions near mean-field isotropic Lifshitz points. We argue that practical application of this design criterion m…
Probabilistic and Robust Engineering DesignRheology and Fluid Dynamics StudiesBlock Copolymer Self-Assembly
Edgar Lara‐Curzio1997-12-01Journal of the American Ceramic Society
The stress‐rupture behavior of plain‐weave CG‐Nicalon/enhanced SiC was studied in air at 950°C. It was found that this material exhibits delayed failure and that the lives of specimens subjected to constant stress levels of 80, 100, and 120 MPa were 21.6, 9.6, and 2.7 h, respectively. The strain histories of these tes…
Concrete and Cement Materials ResearchAdvanced ceramic materials synthesisAluminum Alloys Composites Properties
Maria Laura Di Lorenzo、Mariaenrica Frigione1997-12-01Journal of Polymer Engineering
Polymer blends have been widely studied for the property improvement of commercial polymers. Most polymer blends, however, present coarse and unstable phase morphologies and poor adhesion at the interface, which is due to their immiscibility. Such problems have often been overcome with the addition of a proper compati…
Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesEpoxy Resin Curing Processes
K. G. Neoh、T. T. Young、N. T. Looi 等 5 位作者1997-12-01Chemistry of Materials
Polyaniline (PAN) and polypyrrole (PPY) were coated on pristine and acrylic acid graft copolymerized low-density polyethylene (LDPE) films and exposed to chloroauric acid solutions. The reduction of Au(III) ions in solution was followed using ultraviolet−visible absorption spectroscopy. The structures of the PAN and P…
Conducting polymers and applicationsElectrochemical Analysis and ApplicationsAnalytical Chemistry and Sensors
David Durban、N.A. Fleck1997-12-01Journal of Applied Mechanics
A finite strain analysis is presented for the pressurized spherical cavity embedded in a Drucker-Prager medium. Material behavior is modeled by a nonassociated deformation theory which accounts for arbitrary strain-hardening. The governing equations of spherically symmetric response are reduced to a single differentia…
Metal Forming Simulation TechniquesElasticity and Material ModelingHigh-Velocity Impact and Material Behavior
Leroy E. Laverman、Mikio Hoshino、Peter C. Ford1997-12-01Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA Dissociative Mechanism for Reactions of Nitric Oxide with Water Soluble Iron(III) PorphyrinsLeroy E. Laverman, Mikio Hoshino, and Peter C. FordView Author Information Department of Chemistry, University of California, Santa Barbara, California 93106, and Institute of…
Nitric Oxide and Endothelin EffectsPorphyrin and Phthalocyanine ChemistryHemoglobin structure and function
Jorge Luis González-Velázquez、Roman Ramirez、J.M. Hallen 等 4 位作者1997-12-01CORROSION
A mathematical model was proposed for determining the crack growth rate of hydrogen-induced cracking (HIC) in steel plates exposed to a sour gas. The model assumes that the extension of an embedded circular crack results from accumulation of internal hydrogen pressure that produces a rise of the stress intensity facto…
Hydrogen embrittlement and corrosion behaviors in metalsNon-Destructive Testing TechniquesMaterial Properties and Failure Mechanisms
Yasuteru Urano、Tsunehiko Higuchi、Masaaki Hirobe 等 4 位作者1997-12-01Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPronounced Axial Thiolate Ligand Effect on the Reactivity of High-Valent Oxo−Iron Porphyrin IntermediateYasuteru Urano, Tsunehiko Higuchi, Masaaki Hirobe, and Tetsuo NaganoView Author Information Graduate School of Pharmaceutical Sciences The University of Tokyo 7-3-1…
Porphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation MechanismsPorphyrin Metabolism and Disorders
Yonghao Zhao、K. Lu1997-12-01Physical review. B, Condensed matter
Quantitative x-ray-diffraction measurements in a temperature range 88--325 K were performed on porosity-free nanocrystalline (nc) elemental Se samples with a hcp structure. The nc-Se samples with different grain sizes were synthesized by crystallizing a melt-quenched amorphous-Se solid. Thermal-expansion coefficients…
High-pressure geophysics and materialsPhase-change materials and chalcogenidesNuclear materials and radiation effects
Katja Loos、Reimund Stadler1997-12-01Macromolecules
In the present communication we demonstrate the synthesis of a hybrid block copolymer based on the combination of a biopolymer (amylose) with a synthetic block (polystyrene). To obtain such materials, amino-functionalized polymers were modified with maltoheptaose moieties that serve as initiators for the enzymatic pol…
Advanced Polymer Synthesis and CharacterizationSurfactants and Colloidal SystemsBlock Copolymer Self-Assembly
Yun‐Dong Wu、Kyle W. K. Chan、Cong-Ping Yip 等 6 位作者1997-12-01The Journal of Organic Chemistry
Density functional calculations have been carried out on free-base porphyrin ( 1 ) and its seven possible isomers ( 2 − 8 ) with an N 4 -metal coordination core. A total of 27 structures resulting from geometrical isomerism (( E / Z )-configurations) and NH tautomerism were studied. Geometries were fully optimized wit…
Supramolecular Chemistry and ComplexesPorphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation Mechanisms