Materials Literature
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Die wunderschönen nanoskaligen Architekturen der Schalen von Diatomeen (die Zellwand von Stephanopyxis turris ist im Bild zu sehen) haben eine Hierarchie hexagonaler Silicatstrukturen als Hauptmotiv. Die Annahme, dass langkettige Polyamine – ein Bestandteil von Biosilicaten – an der Musterbildung beteiligt sind, wurde…
Calculations of complete energy level schemes for 4 f n and 4 f n -1 5 d 1 electronic configurations of free trivalent rare-earth ions have been performed. Semi-empirical Hamiltonian was used for the calculation of 4 f n configuration while a fully relativistic first-principles many-electron method was used for the ca…
In this work, a kinetic study of the selective catalytic reduction of NO with NH 3 has been carried out in an effort to analyze the effects of the gas composition (NO, NH 3, and O 2 partial pressures) and temperature (125−175 °C) on the catalytic activity of vanadium oxide supported on carbon−ceramic cellular monolith…
A metal-coated carbon nanotube (CNT) tip for scanning tunneling microscope (STM) has been developed. By pulsed laser deposition (PLD), a CNT attached to a tungsten tip was uniformly coated with 3–6 nm of tungsten thin layer. The observation of a Si(111)-7×7 surface using the tungsten-coated CNT tip demonstrated stable…
The reversible crystal−glass and glass−crystal transitions discovered in KSb 5 S 8 were studied in detail with nonisothermal scanning calorimetry techniques. When cooled, molten KSb 5 S 8 becomes a metastable glass, which can quantitatively revert to the crystalline form if heated above 277 °C. Crystalline KSb 5 S 8 i…
A variety of microstructures have been observed in plasma-sprayed yttria-partially stabilized zirconia (YSZ) thermal barrier coatings. Control of the coating microstructures requires a good understanding of the heat transfer and solidification during the process. This article presents a quantitative analysis of heat t…
Thin films of $(1\ensuremath{-}x){\mathrm{PbMg}}_{1/3}{\mathrm{Nb}}_{2/3}{\mathrm{O}}_{3}\ensuremath{-}x{\mathrm{PbTiO}}_{3}$ (PMN-PT) with $x=0,$ 0.1, 0.3, 0.35, and 0.4 have been fabricated on (001)MgO single-crystal substrates by pulsed laser deposition (PLD). X-ray diffraction (XRD), scanning electron microscopy (…
Generell anwendbar ist eine neue Herstellungsmethode für Perowskit- und verwandte Nanomaterialien. So reagierten Alkali- oder Erdalkalimetalle in Benzyl alkohol mit Übergangsmetallalkoxiden zu Perowskit-Nanopartikeln. Nebenstehend ist die Synthese von BaTiO3-Nanokristallen vor dem Hochauflösungs-TEM-Bild eines Nanopar…
Characterization of the potential energy surface is one of the essential problems to understand the mechanism of the ion conduction in glasses. In this work, ion dynamics in several lithium silicate glasses are examined by using molecular dynamics simulations. The number of ion sites, site energy, and the respective s…
Aufgetakelt: Einen Grundzustand mit sehr hohem Spin (vermutlich S=14) haben die ferromagnetischen Austauschwechselwirkungen zur Folge, die die ungewöhnlichen μ4:η1-Azidobrücken in einem neunkernigen FeII-Komplex (siehe Bild) induzieren. Die Kombination aus hohem S-Wert und magnetischer Anisotropie der Eisen(II)-Zentre…
A novel method for preparing silica membranes with controlled pore size and porosity is reported. Mesoporous silica membranes were modified at near room temperature, using catalyzed atomic layer deposition (C-ALD) of silicon dioxide within the membrane. The catalyst, pyridine, in addition to reducing the reaction temp…
Water interactions in extruded zein films were investigated through moisture sorption isotherms. Sorption isotherms of zein products were affected by composition and structure morphology. Zein powder showed moisture sorption hysteresis, which was not observed in extruded samples. Extruded samples held less moisture th…
Hochgradig winklig: Durch Insertion eines Azidoliganden in ein Polyoxometallat entsteht KRb5[(PW10O37){Ni(H2O)2}(μ-N3)]⋅19 H2O mit ferromagnetischer Kopplung der NiII-Zentren (siehe Bild). Die {Ni(μ-1,1-N3)Ni}-Einheit in diesem ersten einfach verbrückten Azido-NiII-Fragment zeichnet sich durch den größten bekannten Ni…
Better by degrees: Insertion of an azido ligand in a polyoxometalate led to the complex KRb5[(PW10O37){Ni(H2O)2}(μ-N3)]⋅19 H2O, in which the NiII centers are ferromagnetically coupled (see picture). The {Ni(μ-1,1-N3)Ni} core constitutes the first monobridged azido NiII complex obtained. The Ni-N-Ni angle is the larges…
Using the coupled-cluster methodology and large correlation consistent basis sets, we have examined the BX and YBBY ( 1 Σ g + ) molecules, where X = He, Ne, Ar, Kr, CO, CS, and N 2 and Y = Ar, Kr, CO, CS, and N 2 . For the B−X series we have constructed full potential energy curves reporting total energies, equilibriu…
The atomic scale ordering and properties of cubic silicon carbide (β-SiC) surfaces and nanostructures are investigated by atom-resolved room and high-temperature scanning tunnelling microscopy (STM) and spectroscopy (STS), synchrotron radiation-based valence band and core level photoelectron spectroscopy (VB-PES, CL-P…
Auf Draht: Nanodrähte des Titandioxid-Polymorphs TiO2-B erhält man direkt und in hohen Ausbeuten durch Hydrothermalreaktion von NaOH mit TiO2-Anatas, Waschen mit Säure und anschließende Wärmebehandlung (siehe Bild). Die TiO2-B-Nanodrähte können reversibel mit Li+-Ionen oder Elektronen beladen und damit in Ionen- bzw.…
We investigate electronic transport properties of single-walled carbon nanotubes (SWNT's) under hydrostatic pressure, using first-principles quantum transport calculations aided by molecular-dynamics simulation and continuum mechanics analysis. We demonstrate a pressure-induced metal-to-semiconductor transition in arm…
The crystal structure of NAD(+)-dependent alcohol dehydrogenase from Bacillus stearothermophilus strain LLD-R (htADH) was determined using X-ray diffraction data at a resolution of 2.35 A. The structure of homotetrameric htADH is highly homologous to those of bacterial and archaeal homotetrameric alcohol dehydrogenase…
Abstract This work investigated the ion exchange of ammonia on clinoptilolite obtained from mineral deposits located in San Luis Potosi and Sonora, Mexico. Experimental ion exchange isotherm data were obtained in a batch adsorber. The effects of temperature and solution pH on the ion exchange capacity were studied and…