Materials Literature
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Orbital ordering leads to an unconventional excitation spectrum that we investigate by resonance Raman scattering using incident photon energies between 1.7 and 5.0 eV. We use spectral ellipsometry to determine the corresponding dielectric function. Our results show resonant behavior of the phonon Raman cross section…
A novel photocontrollable magnetic thin film consisting of amphiphilic azobenzene cations, a smectite clay, and Prussian Blue has been designed and prepared by using the Langmuir−Blodgett method and an ion-exchange reaction. This magnetic thin film possesses a well-organized nanoscale layered structure. Reversible pho…
The ability to control the transformation process between polymorphs of crystalline materials is critical to ensure that the correct form is produced, and hence it is essential to learn which experimental factors affect this transformation reaction. In this contribution, the kinetics of the polymorphic transformation…
Synthesis of a highly ordered, two-dimensional hexagonal ( P 6 mm ) mesoporous benzene−silica composite having molecular-scale periodicity in the pore wall from the self-assembly of nonlinear symmetric 1,3-bis(triethoxysilyl)benzene and octadecyltrimethylammonium surfactant is described. The synthesis of hybrid organo…
Results from different sets of band calculations for undoped and doped HgBa$_2$CuO$_4$ show that small changes in localization can lead to very different ground states. The normal LDA results are compared with 'modified' LDA results, in which different linearization energies make the O-p band more localized. The groun…
Recent data from angle-resolved photoemission experiments published by Zhou et al. [Nature, Vol. 423, 398 (2003)] concerning a number of hole-doped copper-oxide-based high-temperature superconductors reveal that in the nodal directions of the underlying square Brillouin zones (i.e. the directions along which the d-wav…
We present a study of the dielectric function of metallic (III,Mn)V diluted magnetic semiconductors in the infrared regime. Our theoretical approach is based on the kinetic exchange model for carrier induced (III,Mn)V ferromagnetism. The dielectric function is calculated within the random phase approximation and, with…
We present electrical measurements of high-frequency magnetic dynamics excited by spin-polarized currents in Co/Cu/Ni80Fe20 nanopillar devices, with a magnetic field applied perpendicular to the sample layers. As a function of current and magnetic field, the dynamical phase diagram contains several distinguishable pre…
We present results from extensive numerical integration of the KPZ equation in $1 + 1$ dimensions aimed to check the long-time behavior of the dynamical structure factor of that system. Over a number of decades in the size of the structure factor we confirm scaling and stretched exponential decay. We also give an anal…
The effect of solvent quality on dilute and semi-dilute regimes of polymers in solution is studied by means of Monte Carlo simulations. The equation of state, adsorptions near a hard wall, wall-polymer surface tension and effective depletion potentials are all calculated as a function of concentration and solvent qual…
This paper was withdrawn by the authors.
We present the results of molecular dynamics computer simulations of a binary Lennard-Jones liquid confined between two parallel rough walls. These walls are realized by frozen amorphous configurations of the same liquid and therefore the structural properties of the confined fluid are identical to the ones of the bul…
We present results of a computational study of ZnO in the presence of Co and Mn substitutional impurities. The goal of our work is to identify potential ferromagnetic ground states within the (Zn,Co)O or (Zn,Mn)O material systems that are also good candidates for piezoelectricity. We find that robust ferromagnetism is…
The ability to localize, identify, and measure the electronic environment of individual atoms will provide fundamental insights into many issues in materials science, physics, and nanotechnology. We demonstrate, using an aberration-corrected scanning transmission electron microscope, the spectroscopic imaging of singl…
Abstract The macrokinetics of poly(trimethylene terephthalate) (PTT) polycondensation reaction during the high‐vacuum process was studied. The results showed that PTT polycondensation reaction may be considered as a second‐order reaction and thermal degradation is negligible in mathematical handling. The intrinsic vis…
Mild und praktisch: Eine Methode zur Beschichtung flacher Siliciumoberflächen mit organischen Monoschichten unter Bestrahlung mit sichtbarem Licht (447 nm; siehe Schema) wurde entwickelt, und der Mechanismus des Prozesses wurde untersucht. Mit winkelauflösender Röntgenphotoelektronenspektroskopie (ARXPS) konnten Tiefe…
Ein Hin und Her: Asymmetrisch substituierte Dimere von Ru3-Clustern, [Ru3O(OAc)6(L)(CO)(μ-pz)Ru3O(OAc)6(L′)(CO)] (pz=Pyrazin, L und L′ sind N-Liganden), zeigen bei elektrochemischer Reduktion eine Koaleszenz der IR-Spektrallinien in der νCO-Region. Die IR-Spektren sprechen für die Existenz von zwei möglichen „Ladungst…
Gut gecremt: Kreuzkupplungen in wässrigen Emulsionen als Reaktionsmedium führen zu kovalent vernetzten Polymerpartikeln (siehe Bild). Durch Änderung der Reaktionsbedingungen lässt sich die Größe der sphärischen Partikel leicht über mehrere Größenordnungen (mm bis nm) variieren. Diese Materialien können in Suspension v…
The interacting induced dipole polarization model is used for the calculation of the dipole–dipole polarizability α. The method is tested with single-wall carbon nanotubes (SWNTs) as a function of nanotube radius and elliptical deformation. The results are similar to ab initio reference calculations. For the zigzag tu…
Den ersten theoretischen Beleg für quadratisch-planar koordinierte Nichtmetalle im Zentrum quadratischer Hydrometallkomplexe M4H4X (M=Cu, Ni; X=B, C, N, O; siehe Bild) lieferten Ab-initio-Rechnungen. Daraus könnte eine neue Richtung für die Chemie nichtmetallzentrierter Hydrometalle mit potenziellen Anwendungen als Ka…