Materials Literature
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Ein Vanadium-substituiertes Polyoxomolybdat-Ion ([PV2Mo10O40]5−, oben rechts) aktiviert Distickstoffmonoxid und erleichtert dadurch die hoch selektive katalytische Oxidation von primären und sekundären Alkoholen zu Aldehyden bzw. Ketonen sowie die Oxidation einer Reihe von Alkylaren-Substraten (siehe Schema).
Epitaxial SrRuO3 thin films on (001) SrTiO3 substrates grown by pulsed laser ablation at deposition temperatures ranging between 690° and 810 °C have been examined. The correlations between dc and microwave resistivity, microstructure, and surface morphology are obtained. According to the x-ray measurements the struct…
The system poly-γ-benzyl-l-glutamate—dimethylformamide (PBG/DMF) is the most-studied of the rodlike polymer-solvent systems. However, up to now there is no satisfactory experimental phase diagram (PD) for this system in the entire range of concentrations. For all studied systems only fragments of the PD are known. Som…
Abstract The miscibility of thermotropic liquid crystalline polymers (TLCPs) and polyester blends was investigated with thermal and morphological analyses, as well as transesterification. TLCPs composed of 80 mol % para ‐hydroxybenzoate (PHB) and 20 mol % poly(ethylene terephthalate) (PET) or 60 mol % PHB and 40 mol %…
This article describes several aspects of the production of cross-linked polyethylene. Advantages and disadvantages of chemical, or electron beam irradiation, cross-linking processes are discussed. The material under test is thermoshrinking low density polyethylene, produced at the Megarad s.r.l. (Cassino, Italy) firm…
Die Elektronenstruktur von Eisen-Porphyrin-Komplexen und Iodbenzol-Derivaten beeinflusst deutlich die Bildung von Iodbenzol-Eisen(III)-Porphyrinintermediaten 2, die bei der Reaktion von Oxoeisen(IV)-Porphyrin-Radikalkationen 1 und Iodbenzol erhalten werden. Die Epoxidierung von Olefinen mit 2 liefert die Epoxidierungs…
We investigated water-soluble dendrimers and polymers as ligands for selective anion binding. PAMAM Starburst dendrimers and polyethylenimine have been chemically modified to incorporate new ligands or hydrogen bonding groups at the primary amines. These molecules, along with the unmodified parent compounds, bind arse…
Abstract Thin films of SnO 2 have been successfully deposited by atomic layer deposition (ALD) using the SnI 4 /O 2 precursor combination. Depositions were carried out in the temperature range 400–750 °C on SiO 2 /Si(100) and single‐crystalline α‐Al 2 O 3 (012) substrates. The films were found to grow as the tetragona…
Self-diffusion studies of boron in polycrystalline TiB2 were carried out as a function of temperature, using a specially designed experiment with stable B10 tracers, B−enriched11 TiB2 samples, and secondary ion mass spectrometry for depth profiling. The diffusivities were extracted from the isotope depth profiles in t…
Diamondlike carbon films have been deposited on polycarbonate by pulsed laser deposition technique by irradiating highly oriented pyrolytic graphite with high-energy excimer laser pulses (248 nm wavelength, 20 ns duration, and up to 37 J/cm2 energy density). Irradiations were performed in different atmospheres: (1) mo…
High-speed melt spinning of polylactides with various d-lactide contents was carried out and the structure and properties of the as-spun fibers were investigated. The highest take-up velocities attained for polylactides with low, middle, and high d-lactide contents (PLA-L, PLA-M, and PLA-H) were 10, 9, and 8 km/min, r…
A crosslinkable metallocene polyethylene–octene elastomer (POE) containing different amounts of dicumyl peroxide (DCP) was prepared in a mixer at 110°C to remove the methanol and to ensure a uniform distribution of DCP. A crosslinking reaction of the crosslinkable mixture was carried out for 20 min in a hot press at 1…
BaFe 12 O 19 films have been grown by pulsed laser deposition (PLD) on (001) sapphire using two different conditions (with and without oxygen). Layers grown in O2 atmosphere exhibit an epitaxial structure (stressed at the interface) with a perpendicular easy axis whereas magnetic anisotropy is randomly oriented in tho…
Rice husk powder (RHP) and silica-filled polystyrene (PS)/styrene butadiene rubber (SBR) composites were prepared by using the laboratory size internal mixer (Brabender Plasti-corder). The torque development, morphology, and mechanical properties such as tensile strength, elongation at break, Young modulus, and impact…
Effective medium theory was used to model optical properties in the 0.3 – 30 μm wavelength range for films comprised of nanoparticles of a transparent conducting oxide that are connected in a percolating network characterized by a filling factor f. The model is based on charge carrier density ne and resistivity ρ of t…
We have investigated the molecular orientation in the films of polyamic acid (PAA) with azobenzene units in the backbone structure. Anisotropic molecular orientation was induced by irradiation of linearly polarized ultraviolet light (LPUVL). The change in the molecular orientation caused by subsequent thermal imidizat…
Highly ordered macroporous titania films (see Figure) can be prepared over large areas using colloidal silica spheres as a template. This template material has a number of advantages over the more commonly used polystyrene spheres, such as easy removal of the template by immersion in a warm NaOH solution and shrinkage…
Ein Satz neuer Reifen: Die Substitution eines Chrom-Ions im Komplex [Cr8F8(O2CCMe3)16] durch andere Übergangsmetalle führte zu Heterometall-„Rad“-Komplexen (siehe Bild), die in ihren Zentren durch sekundäre Ammoniumionen gestützt werden. Sowohl 3d- (Mn, Fe, Co, Ni) als auch 4d-Metalle (Cd) wurden zur Herstellung derar…
Neutral alkyl-substituted spirobiphenalenyl radicals (see formula) were recently reported that exhibit bistability as a consequence of temperature-dependent hysteretic switching. The high- and low-temperature forms display significant differences in their electrical, optical, and magnetic properties.
Lightweight magnetic ceramics containing bimetallic (Co–Fe) nanoparticles in an essentially amorphous C/SiC matrix have been prepared from the pyrolysis of a polyferrocenylsilane with pendant cobalt clusters. The Figure shows a TEM image of the ceramic material formed at 600 °C under N 2 . Superparamagnetic or ferroma…