Yasuo Saegusa、Minoru Kuriki、Akihiro Kawai 等 4 位作者1990-11-01Journal of Polymer Science Part A Polymer Chemistry
Abstract A series of fluorine‐containing homopolycarbonate and copolycarbonates with a wide range of unit ratio were synthesized by the two‐phase phase‐transfer‐catalyzed plycondensation of 2,2‐bis (4‐hydroxyphenyl)‐1,1,1,3,3,3‐hexafluoropropane (Bisphenol AF) and/or 2,2‐bis (4‐hydroxy‐phenyl) propane (Bisphenol A) wi…
Surface Modification and SuperhydrophobicityMembrane Separation and Gas TransportSynthesis and properties of polymers
Joseph S. Francisco、Ian H. Williams1990-11-01The Journal of Physical Chemistry
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and spectral consequences of ion pairing. 4. Theoretical study of alkali metal tetrafluoroborates (M+BF4-; M = lithium, sodium, potassium, and rubidium)Joseph S. Francisco and Ian H. WilliamsCite this: J. Phys. Chem. 1990, 94, 23, 8522–8529Publication Date (Print)…
Luminescence Properties of Advanced MaterialsCrystal Structures and PropertiesSolid-state spectroscopy and crystallography
Stefanio Bonsignore、G. Cometti、Enrico Dalcanale 等 4 位作者1990-11-01Liquid Crystals
The effect of molecular structural changes on the mesomorphic nature of a new class of macrocyclic columnar liquid crystal is reported. Twenty-six new compounds with general molecular structure I were prepared, characterized and compared. Only dodecasubstituted ester derivatives 2d-h exhibit thermotropic mesophases. T…
Liquid Crystal Research Advancements
Marie‐Pierre Belleville、Jean Marc Brillouet、B. TARODO DE LA FUENTE 等 4 位作者1990-11-01Journal of Food Science
ABSTRACT Two red wines, from the same cultivar, differing by polysaccharide content were filtered using cross‐flow microfiltration with an alumina membrane, pore size 0.2 μm. Filtration flow rates were different. The wine richest in polysaccharides (A) showed a typical external fouling profile with progressive stabili…
Membrane Separation TechnologiesElectrospun Nanofibers in Biomedical ApplicationsPlant Surface Properties and Treatments
P. Luzeau、Xiang Xu、M. Laguës 等 9 位作者1990-11-01Journal of Vacuum Science & Technology A Vacuum Surfaces and Films
We present measurements of the oxidation level (Cu+ and Cu2+ concentration) of copper thin films deposited using a new type of oxygen plasma source. This oxygen plasma source is operated under ultrahigh vacuum, and allows one to oxidize copper up to nearly pure Cu2+ oxide at rather low temperature (<500 °C) and…
ZnO doping and propertiesSemiconductor materials and devicesCopper-based nanomaterials and applications
Erik C. Sowa、J. Macavei、H. Schultz1990-11-01Zeitschrift für Kristallographie - Crystalline Materials
La variete quartz du AlPO 4 cristallise dans P3 1 21 avec a=4,941 et c=10,940 A dans des conditions normales et a=4,605 et c=10,558 A a une pression de 8,51 GPa. L'augmentation de la presion entraine l'augmentation du rapport c/a et la diminution des angles (Al-O-P). Le changement du mode d'empilement de l'oxygene ind…
Glass properties and applicationsCrystal Structures and PropertiesSolid-state spectroscopy and crystallography
Yiqiang Zhang、J. Iwan D. Alexander1990-11-01Physics of Fluids A Fluid Dynamics
It has become evident that the float zone crystal growth method and isothermal liquid bridges may be very sensitive to the residual acceleration environment of a spacelab. Indeed, the shape equilibria show a high degree of sensitivity and, thus, even the small steady acceleration associated with the effective low grav…
Solidification and crystal growth phenomenaGeomagnetism and Paleomagnetism StudiesCharacterization and Applications of Magnetic Nanoparticles
Hans‐Peter Weitzel、Angelika Bohen、Kläus Müllen1990-11-01Die Makromolekulare Chemie
Abstract Some reactions for the synthesis of poly(phenylenevinylene), PPV, are examined for their capability to form poly(9,10‐anthrylenevinylene). The reasons for the failure of these reactions are described. Soluble oligomers with up to seven anthracene units are synthesized. The properties of the oligomers are stud…
Inorganic and Organometallic ChemistryMaterial Properties and ApplicationsSynthesis of Tetrazole Derivatives
Akira Mori、Hitoshi Takeshita、Katsuhiko Kida 等 4 位作者1990-11-01Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of 2-(alkanoyloxy)-5-alkoxytropones. Novel monocyclic rod-type liquid crystalsAkira Mori, Hitoshi Takeshita, Katsuhiko Kida, and Minoru UchidaCite this: J. Am. Chem. Soc. 1990, 112, 23, 8635–8636Publication Date (Print):November 1, 1990Publication History Published…
Liquid Crystal Research AdvancementsMolecular spectroscopy and chiralitySynthesis and Reactivity of Sulfur-Containing Compounds
Catherine J. Murphy、George C. Lisensky、Larry K. Leung 等 5 位作者1990-11-01Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoluminescence-based correlation of semiconductor electric field thickness with adsorbate Hammett substituent constants. Adsorption of aniline derivatives onto cadmium selenideCatherine J. Murphy, George C. Lisensky, Larry K. Leung, Glen R. Kowach, and Arthur B. EllisCite…
Perovskite Materials and ApplicationsQuantum Dots Synthesis And PropertiesAmmonia Synthesis and Nitrogen Reduction
Tsang‐Tse Fang、Horng‐Bin Lin、Jim‐Bin Hwang1990-11-01Journal of the American Ceramic Society
Thermal analysis was performed on coprecipitated materials and on individual components. The detailed decomposition schemes of coprecipitates and individual components are proposed and discussed. According to the proposed decomposition schemes, the values of the observed weight loss are in good agreement with those of…
Calcium Carbonate Crystallization and InhibitionThermal and Kinetic AnalysisChemical Synthesis and Characterization
John Kouvetakis、V. Patel、Chadd Miller 等 4 位作者1990-11-01Journal of Vacuum Science & Technology A Vacuum Surfaces and Films
The composition and structure of boron nitride films prepared by thermal and plasma enhanced chemical vapor deposition (CVD) using borazine as a precursor have been studied. Thermal CVD at temperatures between 475 and 550 °C using either a hot-wall or cold-wall reactor results in amorphous boron-rich films of approxim…
Advanced ceramic materials synthesisMetal and Thin Film MechanicsBoron and Carbon Nanomaterials Research
John Arnold、Caroline G. Hoffman1990-11-01Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA novel synthetic route to scandium porphyrin derivatives and the first structurally characterized metalloporphyrin-.eta.5-cyclopentadienyl sandwich compoundJohn Arnold and Caroline G. HoffmanCite this: J. Am. Chem. Soc. 1990, 112, 23, 8620–8621Publication Date (Print):Novem…
Porphyrin and Phthalocyanine ChemistrySynthetic Organic Chemistry MethodsMetal-Catalyzed Oxygenation Mechanisms
Shankar P. Das1990-11-01Physical Review A
The implications of a self-consistent mode-coupling theory of dense fluids for the liquid-glass transition are considered. First, we show that when higher-order corrections are ignored from our model, there is a dynamic transition of the hard-sphere fluid at an intermediate density to an ideal glassy phase. This is in…
Phase Equilibria and ThermodynamicsMaterial Dynamics and PropertiesThermodynamic properties of mixtures
Elliott B. Slamovich、Frederick F. Lange1990-11-01Journal of the American Ceramic Society
Micrometer size polydispersed spheres of zirconia were produced via electrostatic atomization and pyrolysis of aqueous zirconium acetate‐yttrium acetate precursors. Varying the precursor composition in the ZrO 2 ‐rich region of the ZrO 2 ‐Y 2 O 3 binary system resulted in the production of either single‐crystal (0 and…
Catalytic Processes in Materials ScienceCoagulation and Flocculation StudiesPickering emulsions and particle stabilization
Louise Goulet、Robert E. Prud’homme1990-11-01Journal of Polymer Science Part B Polymer Physics
Abstract Spherulitic growth rates and overall rates of crystallization of poly(ε‐caprolactone‐co‐ε‐methyl‐ε‐caprolactone), poly(CL‐co‐MCL), were analyzed over a composition range from pure poly (ε‐caprolactone) (PCL) to a copolymer containing 40% MCL with an equation which contains the classical nucleation and transpo…
Polymer crystallization and propertiesPolymer Nanocomposites and Propertiesbiodegradable polymer synthesis and properties
F.W.H. Kampers、C.W.R. Engelen、J.H.C. van Hooff 等 4 位作者1990-11-01The Journal of Physical Chemistry
The size of Pt particles introduced into the channels of ZSM-5 zeolite by two different preparation methods has been studied\nwith EXAFS. ZSM-5 was loaded with 2 wt 5% Pt by ion exchange and by impregnation. By careful calcination of the catalysts\nthe dispersion was maintained. The EXAFS measurements were performed o…
Catalytic Processes in Materials ScienceCatalysis and Hydrodesulfurization StudiesCatalysis and Oxidation Reactions
Mingtang Zhao、Marek Samoć、Paras N. Prasad 等 10 位作者1990-11-01Chemistry of Materials
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of third-order optical nonlinearities of model compounds containing benzothiazole, benzimidazole and benzoxazole unitsMingtang Zhao, Marek Samoc, Paras N. Prasad, Bruce A. Reinhardt, Marilyn R. Unroe, Mark Prazak, Robert C. Evers, James J. Kane, Chetan Jariwala, and…
Nonlinear Optical Materials ResearchPhotochemistry and Electron Transfer StudiesNonlinear Optical Materials Studies
T. H. P. Chang、D. P. Kern、L. P. Muray1990-11-01Journal of Vacuum Science & Technology B Microelectronics Processing and Phenomena
The performance of miniaturized electron optical systems comprising a field emission microsource and a microlens for probe forming has been studied. A complete system measuring millimeters in length and diameter with performance exceeding that of a conventional system over a wide range of potentials (100 V–10 kV) and…
Advancements in Photolithography TechniquesElectron and X-Ray Spectroscopy TechniquesSurface and Thin Film Phenomena
Alan C. Newell、T. Passot、M. Souli1990-11-01Journal of Fluid Mechanics
We derive the phase diffusion and mean drift equations for the Oberbeck–Boussinesq equations in large-aspect-ratio containers. We are able to recover all the long-wave instability boundaries (Eckhaus, zigzag, skew-varicose) of straight parallel rolls found previously by Busse and his colleagues. Moreover, the developm…
Theoretical and Computational PhysicsSolidification and crystal growth phenomenaCharacterization and Applications of Magnetic Nanoparticles