Klaus Langer、Е. Тиллманнс、M. Kersten 等 5 位作者2002-11-01Zeitschrift für Kristallographie - Crystalline Materials
Abstract Six new structure refinements and eleven sets of polarised, single-crystal electronic absorption spectra, E ‖ X , Y and Z , in the energy range 35000–5000 cm –1 were obtained on natural and synthetic orthozoisite-type “thulites” and clinozoisite-type piemontites: Ca 2 (Al 3–p M p 3+ ) [OH|O|SiO 4 |Si 2 O 7 ]…
Geological and Geochemical AnalysisCrystal Structures and PropertiesClay minerals and soil interactions
Isa Nishiyama、Jun Yamamoto、John W. Goodby 等 4 位作者2002-11-01Liquid Crystals
A homologous series of chiral twin liquid crystals possessing identical chiral moieties at both peripheral ends, i.e. optically active α,ω -bis{4-[(4′-(1-methylheptyloxycarbonyl)-4-biphenylyl)oxycarbony]phenoxy}alkanes, has been prepared and their liquid crystalline properties investigated. The homologues preferred to…
Liquid Crystal Research AdvancementsOptical Polarization and EllipsometryMolecular spectroscopy and chirality
Jeyaraman Sankar、Venkatramanarao G. Anand、Sundararaman Venkatraman 等 5 位作者2002-11-01Organic Letters
[reaction: see text] Synthesis of mono meso-free modified corroles by a [3+1] methodology is reported.
Porphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation MechanismsSurface Chemistry and Catalysis
G. Giupponi、D. Martin A. Buzza2002-11-01Macromolecules
We present a configurational-biased lattice Monte Carlo scheme for simulating nonideal dendrimers that satisfies detailed balance. This corrects an important shortcoming in a previous lattice Monte Carlo scheme by Mansfield and Klushin: in a previous publication, we showed that the Mansfield and Klushin scheme did not…
Advanced Polymer Synthesis and CharacterizationChemical Synthesis and AnalysisDendrimers and Hyperbranched Polymers
Brigitte Vigolo、Cécile Zakri、F. Nallet 等 5 位作者2002-11-01Langmuir
Starting from gel suspensions of vanadium pentoxide (V 2 O 5 ), we have prepared a series of samples by dilution with aqueous solutions of HPF 6 or NH 4 OH to control the vanadium concentration and the pH. We have first accurately determined the limit of stability of V 2 O 5 ribbonlike particles from visual observatio…
Transition Metal Oxide NanomaterialsElectrochemical Analysis and ApplicationsIron oxide chemistry and applications
Szu Hwee Ng、Junmin Xue、John Wang2002-11-01Journal of the American Ceramic Society
Most of the chemistry‐based preparation routes for bismuth titanate (BIT) involve calcination at elevated temperatures in order to realize precursor‐to‐ceramic conversion. In a completely different approach using an amorphous BIT hydroxide precursor, nanocrystalline particles of layered perovskite BIT are synthesized…
Ferroelectric and Piezoelectric MaterialsMicrowave Dielectric Ceramics SynthesisDielectric properties of ceramics
Dario Bove、Dennis D. Eberl、Douglas K. McCarty 等 4 位作者2002-11-01American Mineralogist
Mean thickness measurements and crystal-thickness distributions (CTDs) of illite particles vary systematically with changes in hydrothermal alteration type, fracture density, and attendant mineralization in a large acid-sulfate/Mo-porphyry hydrothermal system at Red Mountain, near Lake City, Colorado. The hydrothermal…
Geological and Geochemical AnalysisClay minerals and soil interactionsMineralogy and Gemology Studies
Robert C. Reynolds、D. L. Bish2002-11-01American Mineralogist
Numerous studies have demonstrated the presence of at least two distinct kaolinites in individual kaolinite samples, one a low-defect material and the other a moderate- to high-defect material. Other studies have shown that some kaolinites contain the lowest-defect material in the coarsest size fractions whereas other…
Clay minerals and soil interactionsGeochemistry and Geologic MappingMineral Processing and Grinding
Maria Alfredsson、C. Richard A. Catlow2002-11-01Physical Chemistry Chemical Physics
We present periodic density-functional theory calculations within the GGA Hamiltonian for monolayers of Pd and Pt supported on the {111} surfaces of cubic-ZrO2 and CeO2. We find that the adsorption energies for the Pd-layer on both the zirconia and ceria supports are ca. 200 kJ mol−1, while the corresponding adsorptio…
Advanced Chemical Physics StudiesCatalytic Processes in Materials ScienceElectronic and Structural Properties of Oxides
Guillermo Antorrena、Scott Brownridge、T. Stanley Cameron 等 8 位作者2002-11-01Canadian Journal of Chemistry
Reduction of [([Formula: see text]) 2 ][As 6 ] 2 with triphenylantimony and tetrabutylammonium chloride produced the diradical 5,5'-bis(1,3,2,4-dithiadiazolyl) [[Formula: see text]-[Formula: see text]] in high yield as a black solid with widely ranging magnetic susceptibilities (e.g., 0.6 to 2.6 μ B ), which on oxidat…
Organometallic Complex Synthesis and CatalysisMagnetism in coordination complexesLanthanide and Transition Metal Complexes
Catherine Joubert、Philippe Cassagnau、Alain Michel 等 4 位作者2002-11-01Polymer Engineering and Science
Abstract The elaboration of a TPV based on copolymer of ethylene and vinyl acetate (EVA) and polypropylene (PP) as thermoplastic phase was investigated in a batch mixer. The crosslinking reaction is carried out through a transesterification reaction between ester groups of EVA and alcoxysilane groups of the crosslinke…
Polymer crystallization and propertiesPolymer Nanocomposites and Propertiesbiodegradable polymer synthesis and properties
José F. Bartolomé、M. Dı́az、José S. Moya2002-11-01Journal of the American Ceramic Society
The R ‐curve for mullite–molybdenum (32 vol%) composites, which were obtained at 1650°C under reducing conditions with three different Mo average grain sizes (1.5, 3, and 9 μm), was estimated by the indentation‐strength method and compared with that monolithic mullite obtained under similar conditions. The composites…
Advanced ceramic materials synthesisAluminum Alloys Composites PropertiesAdvanced materials and composites
André R. Studart、V. C. Pandolfelli、Elena Tervoort 等 4 位作者2002-11-01Journal of the American Ceramic Society
This paper proposes a novel direct casting method of alumina suspensions using alginic acid salt and the coagulation agent hydroxyaluminum diacetate (HADA). These two compounds allowed the consolidation of alumina suspensions through a simultaneous time‐delayed physical and chemical gelation process. The physical gel…
Advanced ceramic materials synthesisAerogels and thermal insulationElectrophoretic Deposition in Materials Science
Katsuyuki Ogura、Rui Zhao、Hiroyuki Yanai 等 7 位作者2002-11-01Bulletin of the Chemical Society of Japan
Abstract The derivatives of 1-phenyl-2-(2-thienyl)-5-[5-(tricyanoethenyl)-2-thienyl]pyrrole (1a) formed crystals with gold-like or bronze-like metallic luster. When a small substituent is located at the para position of the 1-phenyl group, gold-like lustrous crystals were formed. In contrast, the derivatives of 1 havi…
Magnetism in coordination complexesPorphyrin and Phthalocyanine ChemistryOrganic and Molecular Conductors Research
Edson Minatti、Rédouane Borsali、Michel Schappacher 等 7 位作者2002-11-01Macromolecular Rapid Communications
Micelles made from linear polystyrene-block-polyisoprene (PS/PI) in decane are spherical. The differences in the structure of micelles made from linear and cyclic PS/PI were investigated using small-angle X-ray scattering at rest and under shear flow. The effect of shear revealed that micelles made from cyclic copolym…
Advanced Polymer Synthesis and CharacterizationSurfactants and Colloidal SystemsBlock Copolymer Self-Assembly
Tadanori Koga、Young‐Soo Seo、Xin Hu 等 9 位作者2002-11-01Europhysics Letters (EPL)
In situ neutron reflectivity and dynamic secondary ion mass spectrometry measurements were used to investigate the dynamics of polystyrene thin films in supercritical carbon dioxide (scCO 2 ). The results show that the large degree of anomalous swelling observed is associated with a decrease in glass transition temper…
Polymer crystallization and propertiesPhase Equilibria and ThermodynamicsPolymer Foaming and Composites
B. A. DiDonna、Randall D. Kamien2002-11-01Physical Review Letters
We report on a construction for smectic blue phases, which have quasi-long-range smectic translational order as well as long-range cubic or hexagonal order. Our proposed structures fill space with a combination of minimal surface patches and cylindrical tubes. We find that for the right range of material parameters, t…
Liquid Crystal Research AdvancementsPhotonic Crystals and ApplicationsOcular Surface and Contact Lens
Roberto Rivelino、Kaline Coutinho、Sylvio Canuto2002-11-01The Journal of Physical Chemistry B
The solvation shift of the lowest absorption transition of furfural in water is analyzed as a function of the rotation angle for the interconversion between the two conformations, OO-cis and OO-trans, of furfural. In total, 20 Monte Carlo NPT simulations are performed, corresponding to different rotation angles of the…
Nonlinear Optical Materials ResearchPhotochemistry and Electron Transfer StudiesMolecular spectroscopy and chirality
Charoen Nakason、Azizon Kaesaman、N. Yimwan2002-11-01Journal of Applied Polymer Science
Abstract Deproteinized natural rubber (DPNR) latex was prepared by the incubation of fresh natural latex with a proteolytic enzyme. The DPNR latex was later used to prepare a graft copolymer with methyl methacrylate (MMA). High ammonia (HA) concentrated latex was also used to prepare a graft copolymer with MMA. The ap…
biodegradable polymer synthesis and propertiesElectrospun Nanofibers in Biomedical ApplicationsMicroplastics and Plastic Pollution
K. Haas‐Santo、Oliver Görke、Peter Pfeifer 等 4 位作者2002-11-01CHIMIA International Journal for Chemistry
Catalytic active coatings for microchannels have been developed for metallic microstructure reactors in heterogeneous catalyzed gas phase reactions. To enhance the inner surface of microchannel reactors, porous metal oxide coatings have been made by various deposition techniques such as sol–gel processes, anodic oxida…
Catalytic Processes in Materials ScienceSemiconductor materials and devicesAnodic Oxide Films and Nanostructures