Materials Literature
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The simple shearing of a suspension of charge-stabilized, colloidal particles close to the melting line is investigated by massively parallel, nonequilibrium Brownian dynamics (NEBD) simulation. The suspension undergoes a discontinuous transition from a distorted fluid structure to an ordered ‘‘string’’ phase. Compari…
The elasticity of gelatin gels at large deformation has been measured for various experimental conditions. The general pattern is that stress increases with strain in a nonlinear way up to the point where the gel fails. To interpret this nonlinear stress increase, we studied a number of molecular models by Monte Carlo…
A new concept of conversion distribution applied to the continuous chemical modification and polymerization of polymers in a twin screw extruder was discussed. The kinetics and the residence time distribution function (RTD) are two undissociable parameters in reactive extrusion because their combination reflects the d…
This work discusses the potential of calorimetric (DSC) measurements to study the deformation process of semicrystalline polymer samples. It has been pointed out that parameters such as lamellar fragmentation and the parameter of intrachain melting cooperativity suffered significant changes, showing that the stretchin…
The influence of an air gap on the formation of a filament spun from a solution of cellulose in N-methylmorpholine N-oxide was studied. A number of parameters were investigated, principally, air-gap length, temperature, and humidity and the water content in the polymer solution. Their effect on the draw-down profile a…
The thermal and mechanical properties of blends, obtained by mixing polyamide 6 (PA6) and an amorphous aromatic copolyamide G21 (ISO nomenclature PA 6I/6T), were investigated by differential scanning calorimetry, dynamic mechanical analysis, and mechanical tensile tests. Quenched blends show a single glass transition…
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)…