Materials Literature
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The curing characteristics of unaccelerated sulfur vulcanization of ENR 25 and ENR 50 were studied in the temperature range from 100–180°C. The range of sulfur loading was from 1.5 to 6.5 phr. The scorch time was determined by Mooney Shearing Disk Viscometer whereas the initial cure rate, maximum torque, and reversion…
This study deals with the analysis of structure, physical properties, and dyeing behavior of silk fibers with different filament sizes. Fine and coarse silk fibers were obtained from Akebono and Ariake cocoon varieties, respectively. Both samples exhibited a fairly similar x-ray crystallinity, while the degree of mole…
The effects of crossflow velocity and concentration of pectin on the retentive microfiltration by a titania microfiltration membrane with pectinase physically immobilized on it by a dynamic formation method were investigated to examine the potential of these reactive membranes in applications involving solutions conta…
Compatibility Qfmica glass-ceramics as gas-sealing matehal for sohd oxide fuel cells(SOFC)has been investigated，
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-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…
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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…
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 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 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 -…
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…
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…
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)…
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 (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…
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%…
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…
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…
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…