Materials Literature
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Dramatic fluorescence bursts (see Figure and cover) from conjugated polymers are observed upon exposure to air. The burst occurs prior to photo‐oxidation and is imaged in single molecules of a ladder‐type polymer, but is also found in bulk films. Triplet shelving is identified as an important mechanism limiting the fl…
Abstract The structure–property relationship of sugarcane bagasse fiber‐filled polyamide 6 blends at different blend compositions has been investigated. Blends were prepared in the composition of wt % PA6/wt % bagasse as follows: 98/2, 95/5, and 90/10 for three fiber length ranges (<100, <250, and <500 μm) us…
Abstract Small‐angle neutron scattering (SANS) and light scattering studies were carried out on an organogel consisting of a gelator, coded P‐1, and dimethyl sulfoxide (DMSO). The gelator was made of an oligosiloxane stem and about eight branches of an amino acid derivative combined with a long alkyl chain. The amino…
The vibrational heat capacity of aluminum at fixed volume is studied in molecular dynamics and Monte Carlo simulations, using effective interactions due to Ercolessi and Adams, Mishin et al., and Mei and Davenport. When experimental data are reduced to represent the classical vibrational heat capacity at fixed volume,…
Abstract Ultrafiltration membranes are largely applied as macromolecular solutes and heavy‐metal‐ion separation from aqueous streams. Cellulose acetate and poly(ether sulfone) blend ultrafiltration membranes were prepared by the precipitation phase‐inversion technique in 100/0, 95/5, 85/15, and 75/25% polymer blend co…
Abstract Films of amorphous polystyrene (PS) with a weight‐average molecular weight ( M w ) of 225 × 10 3 g/mol were bonded in a T‐peel test geometry, and the fracture energy ( G ) of a PS/PS interface was measured at the ambient temperature as a function of the healing time ( t h ) and healing temperature ( T h ). G…
Abstract Highly ordered mesoporous Ni particles have been prepared by electroless deposition using lyotropic liquid crystals as templates. The bath conditions, in particular the kind of the reducing agents, greatly affected the degree of the ordering of mesostructures. By using well chosen appropriate reducing agents…
Abstract For Abstract see ChemInform Abstract in Full Text.
Plasticity and microhardness of annealed metallic glass (MG) on the basis of cobalt were investigated. Pursuant to specificity of geometry of ribbon samples and amorphous state, measurement regime of true microhardness of MG is detected. It was found abnormal behavior of microhardness at the stage of transition from a…
Abstract For Abstract see ChemInform Abstract in Full Text.
Abstract Graft copolymerization of nitrile monomers, such as acrylonitrile and methacrylonitrile, onto bleached jute fiber was carried out by using K 2 S 2 O 8 /FeSO 4 redox system in nitrogen atmosphere and their effect on the textile characteristics was also investigated. Percent graft yield increased with the incre…
Graphitic platelets (wings) on carbon nanotubes are produced using a new two‐step chemical vapor deposition method (see Figure and inside cover). Chemical attack during the process, aided by curvature‐induced strain, rips open the outer nanotube walls and produces an irregular and corrugated surface. The new morpholog…
The magnetotransport properties of the spinel ${\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Cd}}_{x}{\mathrm{Cr}}_{2}{\mathrm{S}}_{4}$ have been studied. We found that the magnetic polarons dominate the conduction at temperatures above the Curie temperature ${\mathrm{T}}_{c}.$ Upon substitution of Fe by Cd, the carrier de…
Abstract To obtain a melt‐processable thermosetting polyimide having a high glass‐transition temperature ( T g ) and good solvent resistance, the effect of introducing a crosslinkable agent into the polymer chain ends of the melt‐processable polyimide on its physical properties was studied. The polyimide (calculated n…
We investigated the red-luminescence band at 1.9 eV in a $\ensuremath{\gamma}$ ray irradiated synthetic wet silica, under ultraviolet and vacuum-ultraviolet excitations in the temperature range 17--300 K. The excitation profile detected at $T=17\mathrm{K}$ evidences a broad band peaked at 6.4 eV, with full width at ha…
Abstract The catalytic reduction of NO with CO was investigated in the presence of oxygen over 16 supported metallic catalysts. Ir/WO3, Ir/ZnO, and Rh/Al2O3 showed the pronounced activity even in excess amount of oxygen. The effect of preparation conditions on the activity of Ir catalysts was further studied and it wa…
Abstract A novel, trifluoromethyl‐substituted, bis(ether amine) monomer, 1,4‐bis(4‐amino‐2‐trifluoromethylphenoxy)naphthalene, was synthesized through the nucleophilic displacement of 2‐chloro‐5‐nitrobenzotrifluoride with 1,4‐dihydroxynaphthalene in the presence of potassium carbonate in dimethyl sulfoxide, followed b…
A [100] twist low-angle grain boundary in ${\mathrm{SrTiO}}_{3}$ was systemically studied by means of conventional transmission electron microscopy, high-resolution transmission electron microscopy (HRTEM), lattice distortion analysis, and electron energy-loss spectroscopy (EELS). A dislocation network is formed in th…
We calculate thermal transport in the Falicov-Kimball model on an infinite-coordination-number Bethe lattice. We perform numerical calculations of the thermoelectric characteristics and concentrate on finding materials parameters for which the electronic thermoelectric figure-of-merit $\mathrm{ZT}$ is large, suggestin…
We have investigated the transport and magnetic properties of the perovskite ${\mathrm{LaCo}}_{1\ensuremath{-}y}{\mathrm{Ni}}_{y}{\mathrm{O}}_{3},$ an alloy of ${\mathrm{LaCoO}}_{3}$ (a semiconductor that exhibits spin-state transitions) and ${\mathrm{LaNiO}}_{3}$ (a paramagnetic metal). The metal-insulator transition…