Materials Literature
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Double-layer structures consisting of alternating polar and non-polar layers have been prepared using Mn2+ ions and o-hydroxynaphthoic acids. The polar layers contain the Mn2+ ions, carboxylate groups, hydroxy groups and water molecules. The non-polar layers are built up from the naphthalene moieties. In catena-poly[[…
Unerwartet klein: Der Kristallfeldparameter von CoII in CoFe-Preußisch-Blau-Analoga ist kleiner als bei irgendeiner anderen oktaedrischen CoII(High-Spin)-Moleküleinheit, und er scheint vorrangig durch die Geometrie des Co-Koordinationspolyeders bestimmt zu sein, die eher durch schwache und starke kooperative Wechselwi…
Abstract New optically active tetra‐ ortho ‐substituted biphenyl chiral dopants for nematic liquid crystals are described. It was shown, with respect to our previous results, that biphenyl chiral dopants bearing only mesogenic residues on their 2,2'‐positions and without any substituents on their 4,4'‐positions gave r…
Abstract Summary: The new nanocomposites consisting of metallocene poly(ethylene‐octene) (POE), silicate clay and wood flour (WF) were prepared by means of a melt blending method. In addition, maleic anhydride grafted poly(ethylene‐octene) (POE‐g‐MAH) was studied as an alternative to POE. The samples were characterize…
The dispersion of copper in ceria-supported catalysts was investigated. By variation of the copper loading in a series of Cu x Ce 1 - x O 2 - x samples, it was possible to separate the oxidation of the copper component and the cerium oxide support during N 2 O temperature-programmed oxidation (TPO). Quantitative analy…
We consider the problem of phase separation in eutectic alloy such as e.g. SnPb . For this we derive a phase field model from an atomistic point of view. We find the surface energy to be anisotropic, having in general a nonlinear dependence on concentration. We use matched asymptotic analysis to obtain a corresponding…
A molecular-dynamics model for crack propagation under steady-state conditions is used to study dynamic instabilities along a grain boundary in aluminum that occur when the crack speed approaches 1/3 of the material's Rayleigh wave speed. Instead of crack branching, as is characteristic for a crack propagating in a ho…
Abstract We introduce a simple method to create nanosized, ordered, and highly luminescent thin film of Eu (III)–block copolymer complex. Micelles of polystyrene–block‐poly(4‐vinylpyridine) (PS‐b‐P4VP) in P4VP‐selective solvents (ethanol/ N , N ‐dimethylformamide (DMF) mixture) serve as nanoreactors for the synthesis…
Thin, freestanding porous metal films bearing a dense two-dimensional array of submicroscopic pores were prepared by covering the surface of porous polymeric membranes with a gold/palladium alloy and subsequently removing the polymeric template (see picture). The polymeric membrane itself was prepared on a water surfa…
We show in simulations that a rich variety of interesting orderings such as pinwheel and star states can be realized for colloidal molecular crystal mixtures at rational ratios of the number of colloids to the number of minima from an underlying periodic substrate. These states can have multistep melting transitions a…
Data on the synthesis, structure and physicochemical properties of liquid-crystalline ionomers, a new class of mesomorphous polymeric compounds, are summarised. The main classes of the liquid-crystalline ionomers studied to date (including comb-like and linear) and liquid-crystalline chelato-telechelic polymers are co…
Core-shell Au-Pt nanoparticles were synthesized by using a seed growth method and characterized by transmission electron microscopy, X-ray diffraction, and UV-vis spectroscopy. Au(core)-Pt(shell)/GC electrodes were prepared by drop-coating the nanoparticles on clean glassy carbon (GC) surfaces, and their electrochemic…
A fine mechanical analysis of a polycrystalline material subjected to large stresses must distinguish between intergranular and crystalline matter because they have different mechanical properties. Homogeneity is an illusion at the grain level. It is shown that a grain boundary under the action of a strong enough in-p…
In this study, gypsum, a common amendment for sodic soil reclamation, was compared with langbeinite, a lesser used and known mineral. A column leaching experiment using sodic water was conducted on a sodic, non-saline soil (fine, montmorillonitic, thermic Ruptic Vertic Albaqualf) dominated by smectitic clays. Soil was…
Die Kopf-Schwanz-Selbstorganisation zweier Imidazolylphthalocyaninatozink(II)- oder -magnesium(II)-Einheiten durch wechselseitige Imidazol-Metall-Wechselwirkungen führt zu stark fluoreszierenden Dimeren (siehe Bild, ΦF=Fluoreszenzquantenausbeute) mit Assoziationskonstanten, die auf über 1011 M−1 in Toluol geschätzt wu…
Este trabalho teve como objetivo estudar os efeitos das espécies e adição de parafina nas propriedades de painéis OSB. Foi concluído que as espécies estudadas são homogêneas entre si e produzem painéis de qualidade semelhante, a adição de parafina melhora substancialmente a estabilidade dimensional dos painéis. Os pai…
Host-guest interactions between the periphery of adamantylurea-functionalized dendrimers (host) and ureido acetic acid derivatives (guest) were shown to be specific, strong and spatially well-defined. The binding becomes stronger when using phosphonic or sulfonic acid derivatives. In the present work we have quantifie…
Abstract Diesel particulate filter (DPF) behavior depends strongly on the microstructural properties of the deposited soot aggregates. In the past the issue of the growth process of soot deposits in honeycomb ceramic filters has been addressed under nonreactive conditions, and the influence of the filter operating con…
Most practical reactions that occur in synthesizing or processing materials are heterogeneous. These include oxidation, reduction reactions, dissolution of solids in liquids, and most solid-state phase transformations. Consider the oxidation of a metal by exposure of a solid metal to an atmosphere with a finite partia…
We develop a theory of the Auger neutralization rate of ions on solid surfaces in which the matrix elements for the transition are calculated by means of a linear combination of atomic orbitals technique. We apply the theory to the calculation of the Auger rate of ${\mathrm{He}}^{+}$ on unreconstructed Al(111), (100),…