Materials Literature
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We report muon spin rotation measurements of the local magnetic susceptibility around a positive muon in the paramagnetic state of the quasi one-dimensional spin 1/2 antiferromagnet KCuF$_3$. Signals from two distinct sites are resolved which have a temperature dependent frequency shift which is different than the mag…
Adsorption of submonolayer amounts of Ag on vicinal Cu(111) induces periodic faceting. The equilibrium structure is characterized by Ag-covered facets that alternate with clean Cu stripes. In the atomic scale, the driving force is the matching of Ag(111)-like packed rows with Cu(111) terraces underneath. This determin…
Mesoporous silica vesicles have been prepared by an ultrasound-mediated supramolecular templating technique using cetyltrimethylammonium bromide as the surfactant. Cooperative assembly of the surfactant and silicate species near the air–water interface of the cavitating bubbles results in a vesicular morphology. The v…
This study showed the structures and the thermal behaviors of Si nanocages and nanotubes using classical molecular dynamics simulations based on the Tersoff potential. For hypothetical Si nanotubes based on the Tersoff potential, Si-Si bond length, cohesive energies per atom, diameters, and elastic energy to curve the…
Ordered arrays of ultra-high-density, nanoscopic, cylindrical domains have been prepared in thin block copolymer films directly by spin coating. The process is extremely rapid and reproducible. These oriented arrays result from the competition between solvent evaporation and ordering of the copolymer and a solvent gra…
Chemically functionalized carbon nanotubes (see Figure) are shown to produce composites with improved uniformity and dispersion. At low nanotube loading, a significant enhancement of the mechanical properties can be obtained. Moreover, the polymer/nanotube composites show efficient load transfer between the fillers an…
Anisotropic carbon nanotube–polyester composites have been realized by polymerization of the nanotube–monomer dispersion in a constant magnetic field (see Figure for method). Magnetic susceptibilities, electrical conductivities, and mechanical properties of the composite show clear anisotropy, indicating magnetic fiel…
Gold−silver alloy nanoparticles were synthesized via reduction of varying mole fractions of HAuCl 4 and AgNO 3 by sodium borohydride in the presence of sodium citrate as a capping agent, in water. Solution concentrations were adjusted to avoid the precipitation of AgCl during the course of the reaction. The plasmon ab…
Abstract The objective of this article was to review the use of carbon black (CB) as a conductive filler in polymers and polymer blends. Important properties of CB related to its use in conducting polymers are discussed. The effects of polymer structure, molecular weight, surface tension, and processing conditions on…
Monodispersed superparamagnetic nanoparticles were synthesized from aqueous iron chloride solutions and were modified with poly(ethylene glycol) self assembled monolayers to improve their dispersion, biocompatibility and intracellular uptake for biomedical applications. Transmission electron micrographs (TEM) and atom…
Abstract Superconducting permanent magnets form a completely new class of permanent magnets. Of course, they must be cooled to 77 K or below. At very low temperatures (24 K) their magnetization can be a factor of 10 higher than that of the best conventional magnets, providing magnetic forces and energies which are up…
Osteoporosis represents a major healthcare problem affecting elderly person. Urinary level of the crosslinked N-telopeptide of type I collagen is a sensitive marker of bone resorption. Ten overlapping peptides covering the N-telopeptide of alpha-2 type I collagen were synthesized, purified, and assayed for their relat…
The equivalent properties of a symmetric three-layer structure are derived by a nontraditional method that provides useful insights and a simplified application to some thin-film design problems. The equations derived from this method may be used to design a three-layer replacement for a single layer in an interferenc…
Abstract Phthalic anhydride and maleic anhydride could be completely oxidised to CO2 and H2O over Co-Mg-O/Al2O3 and V-Mg-O/TiO2 catalysts. Experimental results showed that the cobalt and vanadium oxide catalysts promoted with MgO had superior combustion activity than the unpromoted catalysts.
Abstract We show that the damping of longitudinal mechanical oscillations in soft magnetic amorphous ribbons can be significantly reduced by domain refinement. The latter is realized by an out-of-plane anisotropy induced by magnetic field annealing. The phenomena is interpreted in terms of micro eddy currents associat…
Hungarian red clays are the result of soil formation from previous geologic periods. They were spread over areas which were dry during the Tertiary Period and were not covered by sediments. The climate of the Quaternary Period eroded them, so that today they can only be found in areas where they were protected against…
Abstract In this paper, production of precipitated calcium carbonate (PCC) with required particle size and morphological structure, along with its dependence on technological parameters and the properties of Ca(OH) 2 , is discussed. The effect of the reaction environment on the kinetics of CaO hydration and the format…
This paper reports a refined model to predict the tensile behavior of rotor spun yarn from the knowledge of specimen specifications and yarn strain. Fundamental approaches used in modeling include a discrete fiber-modeling principle, an energy method, and a "shortest-path" hypothesis. The study is based on a coaxial-h…
Abstract The U.S. Environmental Protection Agency (EPA) has issued a proposed rule for control of hazardous air pollutants from cellulose manufacturing operations. Both the hydrogen sulfide and carbon disulfide emissions must be controlled. An activated carbon‐based process has been developed which effectively removes…
Abstract Numerous cyclic dibutyltin alkoxides were prepared by condensation of Bu 2 Sn(OMe) 2 with various short or long α,ω‐diols. Insertion of lactones or lactide into the SnO bonds resulted in ring‐expansion polymerizations which allowed a control of the ring size (chain length) via the monomer initiator ratio. Wh…