Compatibility of Mica Glass-ceramics as Gas-sealing Materials for SOFC
Compatibility Qfmica glass-ceramics as gas-sealing matehal for sohd oxide fuel cells(SOFC)has been investigated，
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Valence Electron Cloud Asymmetry from Two Points of View: A Correlation between Mössbauer Quadrupole Splittings and 57Fe NMR Chemical Shifts of Diamagnetic Iron(II) Porphyrinates
We have prepared a series of 94.5%-enriched 57 Fe(II) complexes of tetramesitylporphyrin and octaethylporphyrin having various bis- or mixed axial ligation and investigated them by both NMR and Mössbauer spectroscopy. The results obtained, and literature values for MbCO and cytochrome c, show a rough correlation betwe…
Microstructure-Property Relations of Solid Oxide Fuel Cells. Microstructural Design of Cathodes and Current Collectors
Microstructure-propey relati )ns ofsolid oxide fuel cells are studied using ZrO2-ln203as a model electroiyteelectrodeImd ZK2(Y203)Laog5SrM5MnO3-Pt mesh as a model electrolyteelectrodecuent collectorEiectrochemical performmce ofthe cells depellds strongly on the microstructure of electrode as well as the geometry ofthe…
Suppression of Chromium Diffusion to an SOFC Cathode from an Alloy Separator by a Cathode Second Layer
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Interaction between Microstructure and Electrical Properties of Screen Printed Cathodes in SOFC Single Cells
The relationship between mlcrostructural and electrical properties of screen printed cathodes has been investigated by testing single cells with different cathode microstructures undeHealistic working conditionsTo determine the lnfluence of various microstructural properties on the different loss mechanisms occuring d…
Absence of Platinum Enhancement of a Photoreaction on TiO2−CO Photooxidation on Pt/TiO2(110)
The influence of deposited Pt metal clusters on the CO photooxidation reaction on the TiO 2 (110) surface was investigated. An enhancement in the CO photooxidation reaction rate or yield is not observed in the presence of Pt metal clusters on the TiO 2 (110) surface. These results indicate that kinetic models involvin…
Tissue engineering lamb heart valve leaflets
Tissue engineered lamb heart valve leaflets (N - 3) were constructed by repeatedly seeding a concentrated suspension of autologous myofibroblasts onto a biodegradable synthetic polymeric scaffold composed of fibers made from polyglycolic acid and polylactic acid. Over a 2-week period the cells attached to the polymer…
The Slowest Water Exchange at a Homoleptic Mononuclear Metal Center: Variable-Temperature and Variable-Pressure 17O NMR Study on [Ir(H2O)6]3+
The rate constants and activation parameters for water exchange on hexaaqua and monohydroxy pentaaqua iridium(III) have been determined by 17 O NMR spectroscopy as a function of temperature (358−406 K) and pressure (0.1−210 MPa) at several acidities (0.5−5.0 m ). Noncoordinating trifluoromethanesulfonate (CF 3 SO 3 -…
Semiempirical Hartree-Fock calculations for KNbO3
In applying the semiempirical intermediate neglect of differential overlap (INDO) method based on the Hartree-Fock formalism to a cubic perovskite-based ferroelectric material KNbO3, it was demonstrated that the accuracy of the method is sufficient for adequately describing the small energy differences related to the…
Multiple-Scattering Theory of X-Ray Magnetic Circular Dichroism: Implementation and Results for Iron K-edge
An implementation of the multiple-scattering approach to x-ray magnetic circular dichroism (XMCD) in K-edge x-ray absorption spectroscopy is presented. The convergence problems due to the cluster size and the relativistic corrections are solved using an expansion of the Dirac Green function for complex energies up to…
Rapid Synthesis of Dendrimers by an Orthogonal Coupling Strategy
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTRapid Synthesis of Dendrimers by an Orthogonal Coupling StrategyFanwen Zeng and Steven C. ZimmermanView Author Information Department of Chemistry, University of Illinois Urbana, Illinois 61801 Cite this: J. Am. Chem. Soc. 1996, 118, 22, 5326–5327Publication Date (Web)…
Structural Studies by Exciton Coupled Circular Dichroism over a Large Distance: Porphyrin Derivatives of Steroids, Dimeric Steroids, and Brevetoxin B
The present study (see ref 1) delineates the scope and limitations of porphyrin chromophores for structural studies by the exciton coupled circular dichroic (CD) method. A distance dependency of the porphyrin coupling was investigated in the range between 10 and 50 Å. Over short interchromophoric distances, significan…
Charge transfer excitons in C60-dimers and polymers
Charge-transfer (CT) exciton effects are investigated for the optical absorption spectra of crosslinked C60 systems by using the intermediate exciton theory. We consider the C60-dimers, and the two (and three) molecule systems of the C60-polymers. We use a tight-binding model with long-range Coulomb interactions among…
Femtosecond dephasing in porous silicon
We determine dephasing times T2 in free standing porous silicon samples using nondegenerate four-wave mixing. Within the framework of an idealized inhomogeneously broadened two-level system, values of 20 fs for different porosities are obtained. Fast energy relaxation times are found in the range of 1.5–3.5 ps for 64%…
Knotted Heterodinuclear Complexes
Surprisingly stable is the dinuclear complex cation [1CuCu]2+ with entwined ligand 1 (shown on the right; •, ○ = Cu+) that can be demetalated in a stepwise manner. The singly demetalated complex [1Cu]+ can be converted to give dissymmetrical heterodi-nuclear complexes [1CuAg]2+ and [1CuZn]3+ (○ = Ag+ and Zn2+, respect…
Self‐Organized Superlattices of Nanoparticles
Completely new materials arise when semiconductor nanoparticles are periodically ordered in superlattices. First pioneering preparations of such superlattices were achieved by self-organization of ligand-stabilized CdSe and CdS nanoparticles. The block polymerization to give micelles in the presence of gold salts and…
Electroluminescence of erbium–oxygen-doped silicon diodes grown by molecular beam epitaxy
We have fabricated erbium–oxygen-doped silicon light emitting diodes with molecular beam epitaxy by simultaneously evaporating erbium and silicon and providing a suitable background pressure of oxygen. In reverse bias, the diodes show intense room-temperature electroluminescence at λ=1.54 μm, originating from the intr…
Relaxed excited state structure and luminescence of thallium-doped caesium chloride and bromide
Four bands, all belonging to the main thallium centres, have been detected in the emission spectra of CsCl:Tl and CsBr:Tl crystals. Their spectral, polarization and kinetic characteristics have been studied from 0.45 up to 360 K. It has been shown that the new model proposed by us recently for the relaxed excited stat…
The local field distribution of in transition metal fluoride glasses investigated by electron paramagnetic resonance
The EPR spectra of in two transition metal fluoride glasses (PZG and PBI) have been extensively studied as functions of temperature, concentration and microwave frequency (S, X, K and Q bands). The marked changes observed in the EPR spectra with temperature and concentration imply the existence of pairs of ions. The s…
A cubic approximant of the icosahedral phase in the (Al - Si) - Cu - Fe system
We present a stable simple cubic structure in the quaternary system (Al - Si) - Cu - Fe with the composition which corresponds to the p/q = 1/1 cubic approximant of the icosahedral Al - Cu - Fe phase. This cubic structure, with lattice parameter a = 12.330 Å and density , contains roughly 135 atoms per unit cell. Prel…