Materials Literature
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Strahlendes Beispiel: Eine bemerkenswerte Verstärkung der Lumineszenz des TbIII-Komplexes 1 wird bei Zugabe von ZnII-Ionen beobachtet (siehe Bild). Durch seine ausgeprägte Selektivität für ZnII-Ionen und eine Lumineszenz-Lebensdauer im Millisekundenbereich eignet sich 1 hervorragend als Prototyp für die Entwicklung la…
Using ab initio and self-consistent-charge density functional based tight-binding electronic structure calculations the possibility that a recently synthesized layered structure of ${\mathrm{Si}}_{2}{\mathrm{CN}}_{4}$ can lead to superhard structures in the spinel or the $\ensuremath{\beta}$ phase is discussed. Both m…
Large arrays of aligned CN x nanotubes were synthesized by radiofrequency magnetron sputtering of a mixture of nanometre-sized graphite and nickel powders in a nitrogen atmosphere. The CN x nanotubes produced assembled into bundle-like arrays standing perpendicularly on the silicon substrates. The nickel nanoparticles…
Co doping on the Mn sublattice of layered ${\mathrm{LiMnO}}_{2}$ suppresses the Jahn-Teller-driven monoclinic distortion in favor of a layered rhombohedral structure. First-principles calculations (within the local-spin-density approximation--generalized-gradient approximation frame-work) using the VASP code, as well…
The first series of lanthanide(III) monobenzoporphyrin liquid crystalline compounds, meso -tetraalkyltetrabenzoporphyrin (TATBP) ytterbium hydroxy, and relative transition metal benzoporphyrin liquid crystalline compounds (4 series, 24 kinds) are reported that display a hexagonal columnar discotic columnar ( Col h, pr…
The intense environment of an electric arc has been used to create MoS 2 core–shell particles. Instead of running the arc in a vacuum chamber under reduced pressure conditions, an arc discharge in water was employed. The arc was run between a carbon cathode and a Mo hollow rod anode whose interior was packed with MoS…
Glass formers are defined as "type B" when they exhibit a distinct Johari-Goldstein (JG) relaxation, but lack an excess loss ("excess wing," EW) in their structural relaxation peak. By studying the dielectric spectra of a well-known type-B glass former under high pressure, we unequivocally show the existence of an EW,…
We have carried out thermally stimulated current measurements on as-grown TlGaS 2 layered single crystals in the temperature range of 10–60 K with various heating rates. We found experimental evidence for the presence of three trapping centres in TlGaS 2 , located at 6, 12 and 26 meV. We have determined the trap param…
The interaction of 4-(2-mercaptoethyl)pyridinium (HMEP + ) hydrochloride with chromate was investigated using surface-enhanced Raman spectroscopy (SERS) and molecular modeling. It was shown that HMEP + on the gold surface attracted chromate to the SERS surface and that the adsorption of chromate onto the substrate is…
A window of opportunity: The ligand-centred redox activity of complex 1 (depicted) is exploited to make an electrochromic window, which demonstrates rapid and reversible changes in optical transmission at 940 nm. The window is made by adsorbing 1 onto a nanocrystalline Sb-doped SnO2 film attached to a transparent cond…
Mesoporous pure silica (MPS-9) is prepared using an assembly of preformed Silicalite-I nanoclusters with a triblock copolymer surfactant. The results of X-ray diffraction, transmission electron microscopy, and N 2 adsorption show that MPS-9 has a mesostructure that is similar to that of other mesoporous materials prep…
An Gasblasen wurden erstmals ZnSe-Halbleiter-Mikrokügelchen aus Nanokristallen definierter Größe synthetisiert. Die Farbe der Probe hängt dabei von Größe und Struktur der Nanokristalle ab (siehe Bild).
In the strive to find a straightforward method for determining the spin polarization, the analysis of the Andreev reflection process in point contact junctions has attracted much interest. However, the prerequisite for an evaluation of the transport spin polarization in this scheme is the existence of elastic (ballist…
▪ Abstract Solid oxide fuel cells operating at temperatures below 800°C require the use of supported thin film solid electrolytes. A variety of processing methods are reviewed that can deliver electrolyte films with satisfactory performance. These include vapor phase, sol-gel, and powder methods such as colloidal depo…
In past years carbon nanotubes have been the subject of intensive experimental and theoretical efforts, probing their structural, energetic, mechanical, and electronic properties. Recently the successful synthesis of silicon nanotubes (SiNT) has been reported, making these once-hypothetical structures a new candidate…
The metal−support interaction in a Cu/ZnO catalyst is investigated using in situ electron energy loss spectroscopy (EELS) with a resolution better than 1.3 eV. We focus on the energy loss near edge structure (ELNES) at the Cu L 3 ionization edge. The intensity of the ELNES changes, reflecting modifications in the elec…
The special branch: The design of novel T-shaped peptides that coassemble with linear peptides to produce branched fibers is described (see picture). The bottom-up assembly of peptide-based nanostructures of this type holds promise for the development of novel scaffolds for applications in nanobiotechnology.
Olanzapine, a novel benzodiazepine agent used in the treatment of schizophrenia and related psychoses, crystallizes in 25+ crystal forms, seven of which are pharmaceutically relevant: three anhydrates (I−III), three dihydrates (B, D, and E), and a higher hydrate. X-ray crystal structures of the thermodynamically stabl…
First principles density functional calculations are used to study the early oxidation stages of the Mg(0001) surface for oxygen coverages 1/16 <= Theta <= 3 monolayers. It is found that at very low coverages O is incorporated below the topmost Mg layer in tetrahedral sites. At higher oxygen-load the binding in on-sur…
▪ Abstract The use of chemical potential diagrams to examine interface chemistry is discussed in terms of the chemical reactions among oxides and associated interdiffusion across the interface. The driving force for both processes can be determined from the chemical potential values. The geometrical features of the ch…