Materials Literature
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Abstract Co–Fe Prussian blue thin films have been prepared by means of a modified Langmuir–Blodgett technique, in which the hybrid monolayer composed of amphiphiles and clay platelets plays a template role for the formation Co–Fe Prussian blue thin films. Photoinduced magnetization was observed in the thin films as ob…
Silver selenide (Ag 2 Se) nanocrystals were synthesized solvothermally using a single source precursor silver selenite (Ag 2 SeO 3 ) in the presence of dimethyl formamide (DMF) in an autoclave. The effect of time and temperature on the crystalline and morphological behavior of the products was investigated. The intera…
Abstract A tubular template self-assembled from secondary ammonium hydrochloride of a peptidic lipid was used for sol-gel transcription of tetraethoxysilane (TEOS). Very mild catalytic function of the terminal group enabled us to control the wall thickness of the resultant silica nanotubes within 4-nm precision, depen…
Einheitliche, thermisch stabile Silicatnanoröhren mit großer Oberfläche wurden hergestellt (siehe Bild). Erste Untersuchungen lassen vermuten, dass derartige Materialien großes Potenzial für Anwendungen in der Gasadsorption und -trennung sowie in der heterogenen Katalyse haben.
This paper proposes a new saturated single-phase transformer model and a three-phase three-legged transformer model for their implementation in a harmonic load flow. The nonlinear magnetizing behavior of the transformer is represented in both models by a simple saturated reluctance function. The procedure for the nonl…
Abstract The dispersion curves of the dielectric response of KH 2 PO 4 were obtained from 5 Hz to 13 MHz and over the temperature range 120–206 °C for both single crystal and polycrystalline samples. Both types of samples reveal dielectric relaxation at low frequency, for example around 10 4 Hz at 140 °C, which shifts…
Ultraschneller Energietransfer in gemischten supramolekularen Stapeln monofunktionalisierter Oligo(phenylenvinylene) (MOPVs) in Lösung: Columnare MOPV3-MOPV4-Aggregate löschen die MOPV3-Fluoreszenz sehr effizient, was dafür spricht, dass der Energietransfer (ENT) innerhalb der supramolekularen Stapel vom kürzeren zum…
Abstract Upon reaction of titanium propoxide and yttrium 2‐methoxyethoxide with a sevenfold excess of methacrylic acid, three different mixed‐metal clusters were obtained, depending on the titanium to yttrium alkoxide ratio. Clusters of the type Ti 4 Y 2 (μ 3 ‐O) 4 (μ 2 ‐methacrylate) 12 (μ 1 ‐methacrylate) 2 L 2 (L =…
FTIR spectroscopy in reflection mode combined with a focal plane array (FPA) detector was employed for high-throughput screening of activity of catalysts in n-pentane hydroisomerization. The reactor system was evaluated using reference catalysts Pt-MOR and gamma-alumina of known catalytic activity. By using the reflec…
New catalytic FeCrAlloy premixed fiber burners for natural gas combustion in domestic applications were developed according to an accurate microstructural design consisting of subsequent optimized steps: (i) optimal preoxidation of the FeCrAlloy fiber mat so as to develop the best possible Al 2 O 3 layer for simultane…
Abstract Electronic absorption, magnetic circular dichroism (MCD), IR spectra, and cyclic and differential pulse voltammograms of metal‐free and copper monoaza‐ and opposite diazaporphyrins are reported, together with molecular orbital (MO) calculations using the density functional theory (DFT) method. Introduction of…
We report results of integrated study of resistivity, magnetoresistance, Hall effect, thermopower, and magnetothermopower in ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ single crystals with $x=0.15,0.20,0.25.$ The focus is on the vicinity of the Curie temperature. It is shown that near ${T}_{…
The 295Pt and 205Tl NMR chemical shifts of the complexes [(NC)5Pt-Tl(CN)n]n- n=0-3, and of the related system [(NC)5Pt--Tl--Pt(CN)5]3- have been computationally investigated. It is demonstrated that based on relativistically optimized geometries, by applying an explicit first solvation shell, an additional implicit so…
Abstract Die Pyrrol‐Aldehyd‐Cyclokondensation gilt seit über einem halben Jahrhundert als die klassische Eintopfsynthese symmetrischer Porphyrine, lieferte aber auch viele nichtporphyrinartige Makrocyclen wie “N‐invertierte” Porphyrine, Corrole, Sapphyrine und expandierte Porphyrine. Sie erwies sich somit als vielseit…
A silica-supported, lowly loaded vanadium oxide (V2O5/SiO2) photocatalyst promotes the photocatalytic epoxidation of propene with O2 at steady state in a flow reactor system. Very little deep oxidation of propene into CO2 takes place over V2O5/SiO2, in contrast to the results obtained over a TiO2 photocatalyst in whic…
Helicale selbstorganisierte Säulen bilden supramolekulare chirale kubische und columnare flüssigkristalline Phasen (siehe Bild). Wasserstoffverbrückte Scheiben aus Folsäurederivaten, mit Oligo(glutaminsäure)-Domänen und lipophilen Alkylketten, ergeben durch Komplexierung mit nichtchiralen Ionen selbstorganisierte chir…
Spider silk is made and spun in a complex process that tightly controls the conversion from soluble protein to insoluble fiber. The mechanical properties of the silk fiber are modulated to suit the needs of the spider by various factors in the animal's spinning process. In the major ampullate (MA) gland, the silk prot…
Abstract Air‐formed oxide on a CuAl 2 model alloy is shown to be free of copper species, with copper enriching in the alloy. With thickening of the oxide by anodizing, copper enriches further to a critical concentration at which its oxidation proceeds with incorporation of Cu(II) species into the film. Such species mi…
Abstract Angle‐resolved XPS data (elemental quantification and high‐energy‐resolution C 1s) are presented for ten polymers with side‐chains of the form OCO(CF 2 ) y F, COO(CH 2 ) 2 OCO(CF 2 ) y F ( y = 1, 2, 3) and COO(CH 2 ) x (CF 2 ) y F ( x = 1, y = 1, 2, 3; x = 2, y = 8). Particular attention was paid to charge…
A hysteresis model based on the Jiles-Atherton theory is incorporated into a power transformer model in an electromagnetic transient program (EMTP)-type program. The eddy current effects are also included in the same model. Comparisons are made between recorded and simulated waveforms using a single-phase distribution…