Materials Literature
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We report the observation of current-induced abrupt transition from a metallic to an insulating state in a bilayered manganite ${\mathrm{La}}_{1.2}{\mathrm{Sr}}_{1.8}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$ single crystal. A colossal electroresistance effect $[\ensuremath{\rho}(50\phantom{\rule{0.3em}{0ex}}\mathrm{mA})\ensu…
The structural characterization of several novel complexes of gallium(iii) and indium(iii) nitrates, crystallized with 2,2'-bipyridyl (bpy) and 1,10-phenanthroline (phen) from nitromethane solution, is presented. The adduct In(NO3)3:bpy (1:2) is of the form [(ONO2)(O2NO)2In(bpy)2], rather than [(ONO2)3ML2] as found fo…
This paper describes enumeration of a class of topologically distinct periodic divisions of a stripe. Optimization of the geometry of these periodic tilings--optimization that yields minimum total perimeter of the tiles--gives a set of physically plausible periodic structures of monodisperse, two-dimensional foams bou…
Acousticlike vibrations were observed in spontaneous Raman measurements on $\mathrm{Cd}{\mathrm{Te}}_{0.68}{\mathrm{Se}}_{0.32}$ quantum dots embedded in a borosilicate matrix and ascribed to the $l=0$, $l=2$, and $l=1$ modes of a spherical particle. Pump-probe stimulated Raman measurements on the same sample reveal o…
Abstract Blends of modified polypropylene (PP) with poly( R , S )‐β‐hydroxybutyrate (PHB) were prepared by casting polymer solutions, followed by compression molding into thin films. The modified polypropylene was obtained by oxidation with hydrogen peroxide. Oxidation of polypropylene produced new functional groups s…
Abstract Mixtures of liquid‐crystalline di‐oxetanes and mono‐oxetanes are made for the purpose of making birefringent films by photopolymerization. The composition of a di‐oxetane mixture that forms spin‐coated films of planarly aligned nematic monomers is reported. These films are photopolymerized in air. The molecul…
The new selenophosphate Rb4P6Se12 features the trans-decalin-like, [P6Se12]4- anion, a phosphorus-rich species that possesses three parallel P-P bonds and formally P2+ and P4+ centers. The synthesis of Rb4P6Se12 was accomplished with the reductive addition of P to RbPSe6 and represents an interesting example of how al…
Pressure-induced spin transitions of the ${\mathrm{Fe}}^{2+}$ and the ${\mathrm{Mn}}^{2+}$ ions in the ${\mathrm{Fe}}_{x}{\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{S}}_{2}$ system are investigated using calculations based on density-functional theory within the generalized gradient approximation $(\mathrm{GGA})+U$ forma…
This paper sets out the results of mathematical modeling and numerical simulations with regard to the influences of the type and thickness of electrolyte on Solid Oxide Fuel Cell Hybrid System (SOFC-HS) performance. A change of electrolyte materials can result in total hybrid system efficiency increasing from around 4…
Abstract Blends of two biodegradable semicrystalline polymers, poly( p ‐dioxanone) (PPDO) and poly(vinyl alcohol) (PVA) were prepared with different compositions. The thermal stability, phase morphology and thermal behavior of the blends were studied by using thermogravimetric analysis (TGA), scanning electron microsc…
Treatment of mer-VCl3(THF)3 with KTp [Tp = hydridotris(3,5-dimethylpyrazol-1-yl)borate], followed by [NEt4]CN in acetonitrile, affords [NEt4][(Tp)V(III)(CN)3].H2O (1.H2O); aerobic oxidation affords [NEt4][(Tp)V(IV)(O)(CN)2] (2). Subsequent treatment of 2 with Mn(II)(OTf)2 (OTf = trifluoromethanesulfonate) and 2,2'-bip…
Verhaltensänderung: Bei der Abscheidung von atomarem Sauerstoff auf Au-Nanopartikel, die weniger oder mehr als etwa 0.7 nm hoch sind (durch STM ermittelt, siehe Bild), entstehen Sauerstoffspezies mit sehr verschiedenem Oxidationsverhalten gegenüber CO bei Raumtemperatur. Röntgenphotoelektronenspektroskopie wurde einge…
A dielectric relaxation process with nonmonotonic temperature dependence was observed in $\mathrm{KTN}:\mathrm{Cu}$ at the ferroelectric phase. The kinetics of this process were interpreted in terms of the free volume model. It is argued that in this system the small ${\mathrm{Cu}}^{+}$ ions that are frozen in an off…
Abstract Using polarized optical microscopy (POM) equipped with a hot stage, morphological investigations of an isotactic polypropylene (iPP) matrix, induced by a homogeneous iPP fibre and heterogeneous pure/modified nylon 6 fibres, were carried out. With respect to transcrystallization related to heterogeneous nuclea…
The spreading behavior of non-polar polymers in the nanometer thickness range is revisited. By incorporating a distance of closest approach d 0 corresponding to the unbonded atom-atom distance, to the classical London slab-slab interaction energy, we demonstrate that the spreading profiles of a non-polar perfluoropoly…
Self-assembled lamellar structures composed of block copolymers are simulated by molecular dynamics. The response of a bulk system to external shear is investigated, in particular, the average energy, the entropy production, and the stability of the lamellae's orientation. We distinguish two orientations, a parallel o…
High-density polyethylene with shish-kebab structure, prepared by a melt extrusion drawing, was employed to investigate the effect of the well-defined lamellar orientation on the deformation characteristics under uniaxial tensile deformation along the drawing direction. This was done by investigating the true stress−t…
In some polymers, in addition to the usual structural alpha relaxation, a slower alpha' relaxation is observed with a non-Arrhenius temperature dependence. In order to understand better the molecular origin of this alpha' relaxation in poly(methylphenylsiloxane) (PMPS) we have studied, for the first time, the pressure…
9,10-Phenanthrenequinone (PQ) and 1,10-phenanthroline-5,6-dione (PTQ) form 1:1 and 2:1 complexes with metal ions (M (n+)=Sc (3+), Y (3+), Mg (2+), and Ca (2+)) in acetonitrile (MeCN), respectively. The binding constants of PQ--M (n+) complexes vary depending on either the Lewis acidity or ion radius of metal ions. The…
A change of behavior: Deposition of atomic oxygen on Au nanoparticles larger and smaller than about 0.7 nm (as determined by STM, see image) in height results in the formation of oxygen species that exhibit very different oxidation behaviors toward CO at room temperature. X-ray photoelectron spectroscopy has been used…