R. Carlisle Chambers、Craig L. Hill1990-11-01Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox catalysis involving substrate photooxidation with catalyst regeneration by substrate reduction. Simultaneous oxidative C-H bond cleavage and reductive C-S bond cleavage in thioethers catalyzed by polyoxotungstate, W10O324-R. Carlisle Chambers and Craig L. HillCite this…
Advanced Photocatalysis TechniquesPolyoxometalates: Synthesis and ApplicationsAdvanced Nanomaterials in Catalysis
H. Leube、Heino Finkelmann1990-11-01Die Makromolekulare Chemie
Abstract New side‐on liquid‐crystalline side‐chain polymers (LCSCP's) are presented as having a systematic variation of the anisotropy of polarizability with respect to the mesogenic short axis. Starting from hydroquinone as core of the rod, the polarizability perpendicular to the mesogenic long axis is increased step…
Liquid Crystal Research AdvancementsSynthesis and Properties of Aromatic CompoundsSynthesis and properties of polymers
Fu Jya Tsai、John M. Torkelson1990-11-01Macromolecules
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicroporous poly(methyl methacrylate) membranes: effect of a low-viscosity solvent on the formation mechanismFu Jya Tsai and John M. TorkelsonCite this: Macromolecules 1990, 23, 23, 4983–4989Publication Date (Print):November 1, 1990Publication History Published online1 May 2…
Surfactants and Colloidal SystemsPolymer Surface Interaction StudiesBlock Copolymer Self-Assembly
Lu Cheng、Wilson Tam、D. F. EATON1990-11-01Organometallics
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuadratic hyperpolarizabilities of Group 6A metal carbonyl complexesL. T. Cheng, W. Tam, and D. F. EatonCite this: Organometallics 1990, 9, 11, 2856–2857Publication Date (Print):November 1, 1990Publication History Published online1 May 2002Published inissue 1 November 1990ht…
Magnetism in coordination complexesNonlinear Optical Materials ResearchAdvanced NMR Techniques and Applications
Steve W. Martin、Donald R. Bloyer1990-11-01Journal of the American Ceramic Society
Preparation schemes for high‐purity vitreous B 2 S 3 ( v ‐B 2 S 3 ) with a S:B ratio of 1.478 ± 0.032 are described. Preparation schemes reported in the literature are shown by very sensitive FT‐IR measurements to yield v ‐B 2 S 3 with significant oxygen contamination. Through extreme care taken in carbonizing silica…
Glass properties and applicationsCrystal Structures and PropertiesOrganometallic Compounds Synthesis and Characterization
David Collison、Anne K. Powell1990-11-01Inorganic Chemistry
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron spin resonance studies of "FeO6" tris chelate complexes: models for the effects of zero-field splitting in distorted S = 5/2 spin systemsDavid Collison and Anne K. PowellCite this: Inorg. Chem. 1990, 29, 23, 4735–4746Publication Date (Print):November 1, 1990Publicat…
Magnetism in coordination complexesLanthanide and Transition Metal ComplexesElectron Spin Resonance Studies
Manuel Prieto Rubio、Andrew Putnis、Lurdes Fernández-Dı́az1990-11-01Geological Magazine
Abstract The nucleation of barite has been studied in a system involving the doublediffusion of Ba 2+ and SO 4 2- in an Na-rich aqueoussolution, through a porous medium. The evolution of the concentration profiles in the medium, which is a column of porous silica gel, has been determined as a function of time by direc…
Calcium Carbonate Crystallization and InhibitionMinerals Flotation and Separation TechniquesCrystallization and Solubility Studies
G. N. Riley、D. L. Kohlstedt、P. M. Richter1990-11-01Geophysical Research Letters
To investigate the kinetics of porous flow in partially molten peridotite, a melt migration couple – formed from a disc of fine‐grained olivine plus ∼15% of a synthetic K‐Al silicate glass and a disc of poly crystalline olivine – was heated at 1255°C under a confining pressure of 300 MPa for 2 hr. Driven by capillary…
Geological and Geochemical AnalysisHigh-pressure geophysics and materialsGlass properties and applications
Hannelore Håkansson、Hedy Kling1990-11-01Diatom Research
The morphology of some very small Stephanodiscus and Cyclostephanos species from Canada, USA and Europe has been studied by light and electron microscopy. The possible influence of the environment on the variation of those characters often used in the diagnosis of species is discussed and an attempt is made to improve…
Aquatic Ecosystems and Phytoplankton DynamicsFreshwater macroinvertebrate diversity and ecologyDiatoms and Algae Research
P. M. Hergenrother1990-11-01Angewandte Chemie International Edition in English
Abstract Research on high‐temperature organic polymers was initiated in the late 1950s primarily to meet the needs of the aerospace and electronics industry. Since then, many different heat‐resistant polymer systems have been reported, of which several are now commercially available. These polymers are used in many di…
Epoxy Resin Curing ProcessesSynthesis and properties of polymersTribology and Wear Analysis
H.‐J. Fecht、John H. Perepezko、M. C. Lee 等 4 位作者1990-11-01Journal of Applied Physics
The heat capacities of liquid and crystalline Au-Pb-Sb alloys in the glass-forming composition range were measured with droplet emulsion and bulk samples. Based on the measured Cp data, the entropy, enthalpy, and Gibbs free-energy differences between the eutectic solid mixture and undercooled liquid were determined as…
Material Dynamics and PropertiesMetallic Glasses and Amorphous AlloysPhase-change materials and chalcogenides
Val M. Runge、Daphna Y. Gelblum、Mattia Pacetti 等 5 位作者1990-11-01Radiology
As part of a phase II clinical trial, 14 patients with presumed intracranial neoplastic disease underwent magnetic resonance (MR) imaging before and after intravenous injection of gadolinium 1,4,7-tris(carboxymethyl)-10-(2'-hydroxypropyl)-1,4,7,10-tetraazacycl ododecane (HP-DO3A). This neutral (nonionic) gadolinium ch…
Medical Imaging Techniques and ApplicationsLanthanide and Transition Metal ComplexesMRI in cancer diagnosis
Takeo Sàegusa、Yoshiki Chujo1990-11-01Journal of Macromolecular Science Part A - Chemistry
Poly(N-acetylethylenimine) (polyoxazoline) (POZO) with a terminal triethoxysilyl group was successfully synthesized by the ring-opening polymerization of 2-methyl-2-oxazoline followed by termination with 3-aminopropyltriethoxysilane. Triethoxysilyl-terminated telechelic POZO was prepared by using a bifunctional initia…
Synthetic Organic Chemistry MethodsSynthesis and properties of polymersSilicone and Siloxane Chemistry
Zhi‐Xun Shen、R. S. List、D. S. Dessau 等 9 位作者1990-11-01Physical review. B, Condensed matter
We present results of resonant-photoemission and high-resolution x-ray-photoemission-spectroscopy (XPS) studies on single-crystalline CuO, which confirms most of the earlier data obtained from polycrystalline samples. However, some minor differences with earlier results were also observed, which are concentrated on a…
ZnO doping and propertiesCopper-based nanomaterials and applicationsElectronic and Structural Properties of Oxides
Hyung Jik Lee、Keisuke Eguchi、Toyonobu Yoshida1990-11-01Journal of the American Ceramic Society
Ultrafine Si 3 N 4 and Si 3 N 4 + SiC mixed powders were synthesized through thermal plasma chemical vapor deposition (CVD) using a hybrid plasma which was characterized by the superposition of a radio‐frequency plasma and an arc jet. The reactant, SiCl 4 , was injected into an arc jet and completely decomposed in a h…
Advanced ceramic materials synthesisDiamond and Carbon-based Materials ResearchHigh-Temperature Coating Behaviors
Andrea E. Hoyt、Brian C. Benicewicz1990-11-01Journal of Polymer Science Part A Polymer Chemistry
Abstract Nine rigid rod ester monomers endcapped with maleimide, nadimide, and methylnadimide groups were prepared and studied by DSC and hot stage polarized light microscopy. All of the monomers showed thermotropic nematic liquid crystalline phases and could be thermally crosslinked in the nematic phase. The nematic…
Liquid Crystal Research AdvancementsSurfactants and Colloidal SystemsSynthesis and properties of polymers
Geoffrey E. Quelch、Henry F. Schaefer、Colin J. Marsden1990-11-01Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTResolution of a long-standing problem in elemental sulfur chemistry: a theoretical study of tetrasulfurGeoffrey E. Quelch, Henry F. Schaefer III, and Colin J. MarsdenCite this: J. Am. Chem. Soc. 1990, 112, 24, 8719–8733Publication Date (Print):November 1, 1990Publication His…
Thermal and Kinetic AnalysisOrganic Chemistry Cycloaddition Reactions
Akikazu Matsumoto、T. Tarui、Takayuki Otsu1990-11-01Macromolecules
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDilute solution properties of semiflexible poly(substituted methylenes): intrinsic viscosity of poly(diisopropyl fumarate) in benzeneAkikazu Matsumoto, Tetsuya Tarui, and Takayuki OtsuCite this: Macromolecules 1990, 23, 24, 5102–5105Publication Date (Print):November 1, 1990P…
Polymer crystallization and propertiesAdvanced Polymer Synthesis and CharacterizationPolymer Nanocomposites and Properties
Paul G. Williard、Mark J. Hintze1990-11-01Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMixed aggregates: crystal structures of a lithium ketone enolate/lithium amide and of a sodium ester enolate/sodium amidePaul G. Williard and Mark J. HintzeCite this: J. Am. Chem. Soc. 1990, 112, 23, 8602–8604Publication Date (Print):November 1, 1990Publication History Publi…
Ionic liquids properties and applicationsSolid-state spectroscopy and crystallographyCoordination Chemistry and Organometallics
Subhash C. Goel、Michael Y. Chiang、William E. Buhro1990-11-01Inorganic Chemistry
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of six lead(II) dialkoxides, x-ray crystal structures of [Pb(.mu.,.eta.1-OCH2CH2OMe)2].infin. and [Pb3(.mu.-O-tert-Bu)6], and hydrolysis studiesSubhash C. Goel, Michael Y. Chiang, and William E. BuhroCite this: Inorg. Chem. 1990, 29, 23, 4640–4646Publication Date…
Metal complexes synthesis and propertiesPolyoxometalates: Synthesis and ApplicationsOrganometallic Compounds Synthesis and Characterization