Materials Literature
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We calculate the logarithmic moment of the phonon frequency spectrum at a single density for 29 monatomic liquids using two methods, both suggested by Wallace's theory of liquid dynamics: The first method relies on liquid entropy data, the second on neutron scattering data in the crystal phase. This theory predicts th…
Through the hysteresis loop and magnetization spatial distribution we study and compare two models for surface anisotropy in nanomagnets: a model with transverse anisotropy axes and Néel's model. While surface anisotropy in the transverse model induces several jumps in the hysteresis loop because of the cluster-wise s…
We have investigated the doping dependencies of the basal areas in single-layer high-T_c cuprates La_{2-x}Sr_xCuO_4 and HgBa_2CuO_x, as well as in two-layer Y_{1-y}Ca_yBa_2Cu_3O_x and HgBa_2CaCu_2O_x. The basal areas not only tend to shrink on hole doping, as expected from single electron quantum chemistry, but exhibi…
Magnetischer Schulterschluss: Der ringförmige Riesencluster {Mn84} (Ø ca. 4.2 nm) verhält sich wie ein Einzelmolekülmagnet und kristallisiert in Form stapelförmiger Aggregate. Molekulare (bottom-up) und klassische Ansätze (top-down) zum Aufbau nanoskaliger magnetischer Materialien werden hierdurch kombiniert.
We have designed oxidation-responsive vesicles from synthetic amphiphilic block copolymers ("polymersomes") of ethylene glycol and propylene sulfide. Thioethers in the hydrophobic poly(propylene sulfide) block are converted into the more hydrophilic sulfoxides and sulfones upon exposure to an oxidative environment, ch…
We report the preparation of composite foils consisting of two layers, one solid gold and one nanoporous gold. Tip displacements of several millimeters are observed when the foils are immersed in aqueous electrolytes and the electrochemical potential varied. This suggests that nanoporous metals could be used as the ac…
Supported gold nanoparticles exhibit high catalytic activity not only at low temperatures, but also under the presence of moisture. The effect of moisture on CO oxidation over Au/TiO2, Au/Al2O3, and Au/SiO2 was studied at 273 K. It was found that the catalytic activities are enhanced by moisture by up to two orders of…
A meeting of two magnetic worlds: The giant (ca. 4.2 nm) {Mn84} cluster, shown, has a torus structure and is a single-molecule magnet (SMM). It represents a meeting of the molecular (bottom-up) and classical (top-down) approaches to nanoscale magnetic materials, and it crystallizes as nanotubular stacks.
Abstract The magnetization reversal in nanocomposite two‐phase grains embedded in a soft magnetic matrix is calculated using Brown's equation. The grains are spherical, consisting of a soft core surrounded by a hard shell. The calculation yields nonlinear algebraic expressions whose solutions describe the nucleation f…
Abstract An atomistic calculation of the Peierls stress in Al and Cu is undertaken in order to assess consistency with experiments. The measured yield stress extrapolated to 0 K results at least one order of magnitude smaller than the Peierls stress commonly derived from internal friction data. On the theoretical side…
Evolution von Feststoffkatalysatoren: IR-Thermographie und kombinatorisches Bibliotheksdesign führen in wenigen Generationen zu neuen edelmetallfreien Katalysatoren für die Tieftemperaturoxidation von CO in Luft. Das Bild zeigt das emissivitätskorrigierte IR-Thermogramm einer Katalysatorbibliothek; rote Punkte markier…
During the past decade there has been a major change, often described as a paradigm shift, in passive infrared (IR) detection, due to the rapid development of microbolometer IR detectors fabricated by MEMS/MST technology. Microbolometers are now replacing the elegant but costly cryogenically cooled photon detector tec…
The polymorphism and side group location of a series of ethylene−vinyl acetate copolymers (EVA) and their hydrolytic products (EVOH) have been investigated by high-resolution cryogenic Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectroscopy. The experimental results indicated that FTIR spec…
We report susceptibility and nuclear magnetic resonance (NMR) measurements in a polyoxovanadate compound with formula $(\mathrm{NHEt}{)}_{3}[{\mathrm{V}}_{8}^{\mathrm{IV}}{\mathrm{V}}_{4}^{\mathrm{V}}{\mathrm{As}}_{8}{\mathrm{O}}_{40}({\mathrm{H}}_{2}\mathrm{O})]\ensuremath{\cdot}{\mathrm{H}}_{2}\mathrm{O}\ensuremath{…
In the search for new thermostable acentric nonlinear optical (NLO) crystalline materials, several polar imine derivatives with the general structure D-π-A(D‘) were synthesized and studied. Introduction of the amino group (D‘) into the acceptor moiety of these molecules was supposed to bring hydrogen bonds into the cr…
For developing a system capable of on-line detecting and localizing PDs in MV power cables, the choice of the sensor type is crucial. Sensors for detecting PDs can be divided into two main groups: capacitive and inductive sensors. In this paper, the advantages and disadvantages of these two types of sensors are discus…
Abstract Solvothermal reactions between mononuclear halooxomolybdates( V ) and oxalic acid afforded smaller oligonuclear complexes with the oxalate ion engaged in different binding modes. The oxalate ion coordinates as a bidentate terminal ligand to each metal centre of the {Mo 2 O 4 } 2+ unit to form the anion of (Me…
Two new hexanuclear oxamatocopper(II) complexes 3 and 4 have been synthesized from the binuclear copper(II) complexes of the meta- and para-phenylenebis(oxamate) ligands, respectively. Complexes 3 and 4 possess an overall ladderlike structure made up of two oxamate-bridged linear trinuclear units ("rails") connected t…
Polymeric insulators are widely used for high voltage outdoor insulating application due to their substantial advantages compared to the porcelain and glass insulators. Although polymer materials have been proven good, research on development of new polymer-based materials is still on going since the benefits of using…
Nanostructured films from two conducting polymers, poly(o-methoxyaniline) (POMA) and poly(3-thiopheneacetic acid) (PTAA), were fabricated with the layer-by-layer (LBL) technique. The electrochemical response of the LBL films differs from that of a POMA cast film, even in a potential range where PTAA is inactive. This…