Jonathan L. Sessler、Wyeth B. Callaway、Stephen P. Dudek 等 6 位作者2003-01-01Chemical Communications
Aliphatic derivatives of hydrazinophyrin, a new type of tetrapyrrolic macrocycle prepared by the condensation of 2,5-diformylpyrroles with hydrazine, exhibit liquid crystalline properties as judged from polarising optical microscopy; these hydrazinophyrins appear to be the first mesogens derived from an expanded porph…
Porphyrin and Phthalocyanine ChemistryPhotochemistry and Electron Transfer StudiesLuminescence and Fluorescent Materials
Hiroyuki Watanabe、Toshiji Mukai、S. Kamado 等 5 位作者2003-01-01MATERIALS TRANSACTIONS
Fine-grained WZ73 magnesium alloy with the grain size of 1.6 μm was produced by Equal-Channel-Angular Extrusion. The material exhibited tensile yield strength of 293 MPa, tensile strength of 350 MPa and relatively large elongation of 18% at room temperature. The yield strength was almost unchanged up to 473 K. In addi…
Microstructure and mechanical propertiesMagnesium Alloys: Properties and ApplicationsAluminum Alloys Composites Properties
Randolf D. Köhn、Zhida Pan、Mary F. Mahon 等 4 位作者2003-01-01Chemical Communications
Reaction of [Cu(MeCN)4](BF4) with N,N',N"-trimethyl-1,3,5-triazacyclohexane in CH2Cl2 leads to two Cu6 clusters containing the triazacyclohexane as a ligand to triangular Cu3 units with the abstraction and incorporation of chloride and hydride.
Metal complexes synthesis and propertiesMagnetism in coordination complexesLanthanide and Transition Metal Complexes
Satoru Inoue、Song‐Zhu Kure‐Chu、Kenji Wada 等 5 位作者2003-01-01Science and Technology of Advanced Materials
New processes for the preparation of nanostructure on glass surfaces have been developed through anodic oxidation of sputtered aluminum. Aluminum thin film sputtered on a tin doped indium oxide (ITO) thin film on a glass surface was converted into alumina by anodic oxidation. The anodic alumina gave nanometer size por…
Semiconductor materials and devicesNanowire Synthesis and ApplicationsAnodic Oxide Films and Nanostructures
K. Wójcik、K. Zieleniec、M. Milata2003-01-01Ferroelectrics
Results of electric permittivity measurement for PbFe 1/2 Nb 1/2 O 3 (PFN) single crystal and for both undoped and doped with lithium ceramic samples of PFN are presented. Marked influence of the type of electrical conductance on values and on the shape of the dependence of permittivity versus temperature. The dielect…
Advancements in Battery MaterialsMagnetic Properties and Synthesis of FerritesElectrical and Thermal Properties of Materials
Krystyna Rózga‐Wijas、Julian Chojnowski、Witold Fortuniak 等 6 位作者2003-01-01Journal of Materials Chemistry
Silica hybrids of functionalised polysiloxanes of well-defined structures, having various topologies (linear, comb-branched and dendritic-branched) and various densities of functional groups, were prepared. These hybrids were generated by the grafting of the polysiloxane to the prefunctionalised surface of porous sili…
Mesoporous Materials and CatalysisSynthetic Organic Chemistry MethodsDendrimers and Hyperbranched Polymers
Byoung‐Ki Lee、Yang‐Il Jung、Suk‐Joong L. Kang 等 4 位作者2003-01-01Journal of the American Ceramic Society
Two series of experiments were performed to study the experimental conditions for the formation of {111} twins and related microstructures in barium strontium titanate ((Ba, Sr)TiO 3 ). In the first series, the phase equilibria in the BaTiO 3 –SrTiO 3 –TiO 2 system were determined. XRD and WDS analysis, done in the Ba…
Ferroelectric and Piezoelectric MaterialsAdvanced ceramic materials synthesisElectronic and Structural Properties of Oxides
Alexandre Tomas、Romeo Iulian Olariu、Ian Barnes 等 4 位作者2003-01-01International Journal of Chemical Kinetics
Abstract The kinetics of the reaction of O 3 with the aromatic vicinal diols 1,2‐benzenediol, 3‐methyl‐1,2‐benzenediol, and 4‐methyl‐1,2‐benzenediol have been investigated using a relative rate technique. The rate coefficients were determined in a 1080‐L smog chamber at 298 K and 1 atm total pressure of synthetic air…
Atmospheric chemistry and aerosolsAdvanced Combustion Engine TechnologiesCatalytic Processes in Materials Science
Atsushi Takahashi、V. Ajay Mallia、Nobuyuki Tamaoki2003-01-01Journal of Materials Chemistry
Liquid crystalline, thermoptical and glass-forming properties of a series of novel supramolecular hydrogen bonded cholesteric mesogens have been described. These assemblies were built via intermolecular hydrogen bonding between cholesteric esters containing pyridine groups and cholesterol containing carboxylic acid mo…
Liquid Crystal Research AdvancementsMaterial Dynamics and PropertiesSurfactants and Colloidal Systems
Hyung-Hwan Kim、Ju-Wan Lim、Jung-Joong Lee2003-01-01ISIJ International
The oxidation behavior of high-speed steel (HSS), which is used as the work rolls in hot strip mills, was examined under both wet and dry oxidation conditions. In a dry atmosphere, carbides as well as the martensite matrix were oxidized, while only the matrix was oxidized in the wet atmosphere. After dry oxidation, th…
High-Temperature Coating BehaviorsAdvanced materials and compositesMetal Alloys Wear and Properties
Alain Miranville2003-01-01Journal of Applied Mathematics
We present some models of Cahn‐Hilliard equations based on a microforce balance proposed by M. Gurtin. We then study the existence and uniqueness of solutions.
Solidification and crystal growth phenomenaAdvanced Mathematical Modeling in EngineeringFluid Dynamics and Thin Films
Ann M. Chippindale、Fabrice Gaslain、Andrew D. Bond 等 4 位作者2003-01-01Journal of Materials Chemistry
A new layered ammonium manganese(II) diphosphate, (NH4)2[Mn3(P2O7)2(H2O)2], has been synthesised under solvothermal conditions at 433 K in ethylene glycol and the structure determined at 293 K using single-crystal X-ray diffraction data (Mr = 584.82, monoclinic, space group P21/a, a = 9.4610(8), b = 8.3565(7), c = 9.4…
Crystal Structures and PropertiesChemical Synthesis and CharacterizationX-ray Diffraction in Crystallography
Yanqing Tian、Eiichi Akiyama、Yu Nagase2003-01-01Journal of Materials Chemistry
A series of new cyclic tetramethyltetrasiloxanes with coumarin units were synthesized. By a comparative study with their related vinyl terminated precursors, the liquid crystalline properties of the cyclic tetramethyltetrasiloxanes were investigated. The results show that the thermal properties of the cyclic tetrameth…
Liquid Crystal Research AdvancementsPolymer composites and self-healingSilicone and Siloxane Chemistry
Csilla Keresszegi、Jan‐Dierk Grunwaldt、Tamás Mallát 等 4 位作者2003-01-01Chemical Communications
In situ, time-resolved XAS studies on a Bi-Pd/Al2O3 catalyst indicate that Pd, and Bi located on the Pd surface, are in a reduced, metallic state during the oxidation of 1-phenylethanol with molecular oxygen--a key for understanding the role of promoter in the reaction mechanism.
Catalytic Processes in Materials ScienceCatalysis and Oxidation ReactionsOxidative Organic Chemistry Reactions
M. Kunat、U. Burghaus、Christof Wöll2003-01-01Physical Chemistry Chemical Physics
The interaction of atomic and molecular hydrogen with the polar oxygen-terminated ZnO(000-1) surface has been studied by He atom scattering, LEED, and He atom reflectivity measurements. Whereas the sticking coefficient S0 for molecular hydrogen is so low that only an upper limit can be given (S0 < 3 × 10−7), adsorptio…
Advanced Chemical Physics StudiesPhysics of Superconductivity and MagnetismZnO doping and properties
Hiroshi Yokota、Masahiro Ibukiyama2003-01-01Journal of the American Ceramic Society
β‐Si 3 N 4 ceramics sintered with Yb 2 O 3 and ZrO 2 were fabricated by gas‐pressure sintering at 1950°C for 16 h changing the ratio of “fine” and “coarse” high‐purity β‐Si 3 N 4 raw powders, and their microstructures were quantitatively evaluated. It was found that the amount of large grains (greater than a few tens…
Advanced ceramic materials synthesisMXene and MAX Phase MaterialsAdvanced materials and composites
Luis A. Pérez‐Maqueda、M. J. Diáñez、F.J. Gotor 等 6 位作者2003-01-01Journal of Materials Chemistry
Needle-like BaTiO3 particles with controlled microstructure have been prepared from the thermal decomposition of a metal-organic precursor under sample controlled reaction temperature (SCRT) conditions. In a first step, a mixed barium and titanium citrate precursor consisting of a single phase compound with controlled…
Bone Tissue Engineering MaterialsFerroelectric and Piezoelectric MaterialsElectronic and Structural Properties of Oxides
Seong-Su Kim、Dong-Keun Lee、Jainisha Shah 等 4 位作者2003-01-01Chemical Communications
The in-situ graphitization of an as-made, large pore silica mesostructure templated by nonionic Pluronic 123 surfactant micelles provides a low cost pathway to the nanocasting of linear carbon nanotubes.
Zeolite Catalysis and SynthesisPhotonic Crystals and ApplicationsMesoporous Materials and Catalysis
J. E. de Albuquerque、W. L. B. Melo、Roberto Mendonça Faria2003-01-01Review of Scientific Instruments
Photothermal spectroscopies, photopyroelectric and photoacoustic, were used to obtain physical parameters of polyaniline–emeraldine base (PANI-EB) and poly(o-methoxyaniline)–emeraldine base (POMA-EB), such as thermic parameters like thermal diffusivity, thermal conductivity, and specific heat. These studies were done…
Conducting polymers and applicationsTransition Metal Oxide NanomaterialsThermography and Photoacoustic Techniques
Hiroshi Hatta、Takayuki Sohtome、Yutaka Sawada 等 4 位作者2003-01-01Advanced Composite Materials
Crack sealant required for an anti-oxidation SiC-coating on C/C composites was investigated with the intention of finding material effective up to approximately 1800 K. As a sealant, B2O3 is known to be effective. However, B2O3 rapidly evaporates at temperatures exceeding 1000 K. Hence, mixtures of SiO2 /B2O3 at vario…
Advanced ceramic materials synthesisNuclear Materials and PropertiesAdvanced materials and composites