Materials Literature
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Photoinduced electron transfer in a size-quantized CdS/TiO2 composite system has been investigated using emission and transient absorption spectroscopy. Quantum-sized CdS and TiO2 particles were synthesized in reverse micelles using di-octyl sulfosuccinate (Aerosol-OT, AOT) as the surfactant stabilizer. The particle s…
Nanoparticles of cerium oxide with a narrow size distribution (±15%) are prepared by mixing cerium nitrate solution with an ammonium reagent. High-resolution transmission electron microscopy (TEM) indicates that over 99% of the synthesized particles are single crystals. TEM and photon absorption are used to monitor pa…
Much effort has been devoted to the study of the formation of superplastic in aluminum alloys on account of its cost and engineering advantages. From a mechanical point of view, the ability of a crystalline material to undergo superplastic behavior is usually linked to a submicrometer grain size. Equal channel angular…
Various kinds of fuels based on alcohols (methanol, ethanol, and isopropanol) and hydrocarbons (methane, ethane, and ethylene) were directly supplied to solid oxide fuel cells (SOFCs) to compare their power generation characteristics. The results on current-voltage characteristics and anodic polarization have revealed…
Dense amorphous poly(vinyl alcohol) (PVAL) built from a chain with 145 repeating units was studied by constant number of particles, pressure, and temperature-molecular dynamics simulations at temperatures between 400 and 527K. The results of the simulations were compared with pressure–volume–temperature data, solubili…
For the purpose of clarifying the reason why the discharge capacity of a misch metal (Mm)-based hydrogen storage alloy negative electrode in nickel-metal hydride battery drastically decreases at relatively low temperatures, the activation energies for hydrogen diffusion in the alloy bulk, charge-transfer reaction on t…
With an interest in obtaining data on laboratory glass samples to compare with simulated glasses produced by molecular dynamics computer simulations, we have explored, using calorimetric techniques, the fictive temperatures that can be obtained using different laboratory quenching methods. We describe some useful anal…
Ab initio calculations were carried out on zinc-porphyrins complexed to several amines: N-(3,5-dimethyl-pyridin-4-yl)-formamide, 1,4-diazabiciclo[2.2.2]octane (DABCO), and 1-azabiciclo[2.2.2]octane (quinuclidine). The proton chemical shifts of these complexes were calculated ab initio at the GIAO-HF/6-311G//HF/3-21G l…
*Reprinted from Star and Hyperbranched Polymers; Mishra, M.K., Kobayashi, S., Eds.; Marcel Dekker, Inc.: New York; 1999, 201–238.
Coumarin-endcapped tetrabranched liquid copolymers composed of epsilon-caprolactone and trimethylene carbonate (TMC), prepared using pentaerythritol or four-branched poly(ethylene glycol) (PEG) as an initiator, were ultraviolet irradiated to produce photocured solid biodegradable copolymers. The hydrolytic degradation…
The objective of this article is to overview processes of mechanical alloying/milling (MA/MM), and their modifications applied to produce nanostructured single- and multi-phase intermetallics, and their composites, for hydrogen storage. In the most typical processing, MA is used as a preliminary step in synthesizing a…
*Reprinted from Supramolecular Polymers; Ciferri, A., Ed.; Marcel Dekker, Inc.: New York; 2000, 565–613.
Silicas with large (about 10 nm in diameter), uniform, cage-like pores were synthesized from sodium silicate and poly(ethylene oxide)−poly(butylene oxide)−poly(ethylene oxide) B50-6600 triblock copolymer template (EO 39 BO 47 EO 39 ) under acidic conditions. The synthesis procedure was analogous to that reported by ot…
A series of subphthalocyanine-C(60) dyads in which the two subunits are placed at different distances have been prepared and their electrochemical properties measured. Photophysical measurements reveal energy transfer events following the initial photoexcitation of the subphthalocyanine chromophore.
Close contacts between chalcogen atoms in cyclic dienes and diynes are used to create columnar structures in the solid state. Rigid and fairly planar cycles with chalcogen centers are the preconditions for forming those columnar structures.
Intercalation of seven types of cationic surfactants, including polyfluorinated surfactants, into a cation-exchangeable clay mineral, saponite, was investigated. All of the surfactants were found to intercalate in amounts exceeding the cation exchange capacity (CEC). This tendency was more evident in the cases of the…
In the present review article, recent research work on polyaniline-type conducting polymers has been surveyed. Research and development work has been reviewed with special interest in chemical, electrochemical, doping processes, and polyaniline-based composite processes. Process development with high accuracy of produ…
Abstract Styrene‐butadiene rubber (SBR) vulcanizates with graded network‐chain densities in the thickness direction were prepared by layering and heat pressing the compounding sheets. The effect of the gradient of network‐chain density on the mechanical properties of the graded rubber vulcanizates was investigated in…
Abstract The effect of the addition of 5 and 10 phr of unsaturated polyester resin (UPE) on the compatibility and physicomechanical properties of styrene–butadiene (SBR) and acrylonitrile–butadiene (NBR) rubber blends was studied. Differential scanning calorimetry (DSC), scanning electron microscopy (SEM), electrical,…
Polycrystalline samples of BaLaMnO4, oxygen deficient and oxygen excess BaLaMnO4 ± δ and the solid solution BaxSr1 − xLaMnO4 have been prepared and investigated. Magnetic susceptibility, powder X-ray diffraction and variable temperature powder neutron diffraction data are presented for these compounds. BaLaMnO4 and Ba…