Materials Literature
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With a facile one-pot strategy, up-conversion and down-conversion luminescent LaF3 and NaLaF4 nanorods are successfully prepared. Owing to their high up-conversion and down-conversion luminescence, ease of processing, and simple fabrication, these luminescent inorganic nanocrystals may find great potential application…
Benzin mit B und N? Der Ammoniak-Boran-Komplex, H3NBH3, besteht zu 19.6 Gew.-% aus Wasserstoff und wird daher als H2-Quelle für Automobil-Brennstoffzellen in Erwägung gezogen. Hier werden aktuelle Fortschritte vorgestellt, besonders bei der übergangsmetall- und säurekatalysierten H2-Freisetzung unter milden Bedingunge…
Abstract We study the segmental dynamics of poly(ethylene oxide) (PEO) from microscopic simulations in the neat polymer and a polymer electrolyte (PEO/LiBF 4 ) by analyzing the normal modes. We verify the applicability of the Rouse theory, specifically for the polymer electrolyte where dynamic heterogeneities, arising…
We calculated functions for the potential, Vch, in the channel of a field effect transistor with various densities of the localized states (DOS) by using a device simulator. In the saturation condition, Vch is found to fit satisfactorily to the analytical function, Vch(y)=Vg(1-(1-y/L) k), where Vg is the gate bias, y…
We report on the electrical resistivity, magnetic susceptibility and heat-capacity measurements on a new intermetallic compound CePd5Al2, crystallizing in the ZrNi2Al5-type tetragonal structure, with lattice parameters a = 4.156 A and c = 14.883 A. The compound presents Kondo lattice behavior and an easy-plane antifer…
Not a bit like his brother: DFT studies show that ammonia–borane dehydrogenations by iridium pincer complexes occur by concerted hydride and proton transfer from ammonia–borane to the catalyst, not through BH activation and subsequent β-hydride elimination from the nitrogen end, as had been suggested. Such a concerte…
The direct synthesis of H2O2 at low temperature (2 degrees C) from H2 and O2 using carbon-supported Au, Pd and Au-Pd catalysts is described and contrasted with data for TiO2, Al2O3 and Fe2O3 as supports. The Au-Pd catalysts all perform significantly better than the pure Pd/TiO2 and Au/ TiO2 materials. The Au Pd/carbon…
Monodisperse ternary ferrite (MFe 2 O 4, M = Co, Ni, Mn, and Fe) nanocrystals have been synthesized through a facile and general route involving thermolysis of an intimately mixed binary metal−oleate complex with similar decomposition temperature of the constituents.
Improved electron transport along a carbon nanotube (CNT) fiber when it is spun from an array of longer nanotubes is reported. The effect of chemical post-treatments is also demonstrated. For example, the covalent bonding of gold nanoparticles to the CNT fibers remarkably improves conductivity (see figure), whereas an…
The B all and N all? Ammonia–borane (AB, H3NBH3) contains 19.6 weight % H, and is one of the materials currently being examined as a possible H2 source for use in fuel cells to power automobiles. Challenges for this technology are noted, and recent advances, especially in the development of both transition-metal and a…
A strong substrate-graphite bond is found in the first all-carbon layer by density functional theory calculations and x-ray diffraction for few graphene layers grown epitaxially on SiC. This first layer is devoid of graphene electronic properties and acts as a buffer layer. The graphene nature of the film is recovered…
A form of optical circuitry is overviewed in which a tapestry of subwavelength nanometer-scale metamaterial structures and nanoparticles may provide a mechanism for tailoring, patterning, and manipulating local optical electric fields and electric displacement vectors in a subwavelength domain, leading to the possibil…
The mechanism that drives a metal-insulator transition in an undoped quasi-one-dimensional Mott insulator is examined in the framework of the Hubbard model with two different hoppings t(perpendicular1) and t(perpendicular2) between nearest-neighbor chains. By applying an N(perpendicular)-chain renormalization group me…
A new occurrence of authigenic albite was found in a Jurassic sedimentary succession of the Glarus Nappe near Walenstadt (eastern Switzerland). The euhedral shape and the chemical purity of these albites are evidence for their authigenic origin. The crystals are irregularly distributed in the sediment, highlighting th…
Self-assembled films from WO 3 and polyallylamine (PAH) were prepared by the Layer-by-Layer (LbL) method. The electroinsertion of lithium ions into these LbL films treated at room temperature and at 150 °C was examined. More specifically, the electrochemical and chromogenic properties were investigated by cyclic volta…
A carbothermal reaction of silica–phenol resin hybrid gels prepared from a two‐step sol–gel process was conducted in atmospheric nitrogen. The gels were first pyrolyzed into homogeneous silica–carbon mixtures during heating and subsequently underwent a carbothermal reaction at higher temperatures. Using a gel‐derived…
2, 6, 12, and 20 electron quantum dots have been studied using coupled cluster at singles and doubles level and extensive multireference coupled cluster (MRCC) method. A Fock-space version of MRCC (FSMRCC) containing single hole-particle excited determinants has been used to calculate low-lying excited states of the a…
We present the analysis of a single exciton eigenstate in a spherical quantum shell and its linear optical absorption by using the parabolic band model and a matrix diagonalization method. The result shows that the confinement effect for an exciton in a spherical quantum shell structure is stronger than that in a sphe…
Parallel nanochains of ZnS and ZnxCd1−xS alloys, and polygonal nanoplates of CdS were prepared at the air/water interface under Langmuir monolayers of 5,10,15,20-tetra-4-oxy(2-stearic acid) phenyl porphyrin (TSPP) at room temperature and characterized by transmission electron microscopy (TEM), high-resolution TEM (HRT…
Abstract A reasonable analytical basis for dispersion‐related descriptions of the temperature dependences of harmonic parts of isochoric heat capacities is given by a three‐oscillator model for phonon density of states (PDOS) spectra of semiconductors with a relatively large degree of phonon dispersion. Within this mo…