Materials Literature
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Numerical solutions of the Landau-Lifshitz-Gilbert micromagnetic model incorporating thermal fluctuations and dipole-dipole interactions (calculated by the Fast Multipole Method) are presented for systems composed of nanoscale iron pillars of dimension 9 nm x 9 nm x 150 nm. Hysteresis loops generated under sinusoidall…
We calculate magnetic anisotropy energy of Fe and Ni by taking into account the effects of strong electronic correlations, spin-orbit coupling, and non-collinearity of intra--atomic magnetization. The LDA+U method is used and its equivalence to dynamical mean--field theory in the static limit is emphasized. Both exper…
We used scattering dichroism to study the combined effects of viscous and magnetic forces on the dynamics of dipolar chains induced in magnetorheological suspensions under rotating magnetic fields. We found that the chains adjust their size to rotate synchronously with the field but with a constant phase lag. Two diff…
We consider the adsorption at an oil−water interface of spherical particles of two types. The first type has a homogeneous surface of uniform wettability. The second type, so-called “Janus” particles, has two surface regions of differing wettabilities. Homogeneous particles are strongly surface active but are not amph…
We introduce a phenomenological continuum model for the mode III dynamic fracture that is based on the phase-field methodology used extensively to model interfacial pattern formation. We couple a scalar field, which distinguishes between "broken" and "unbroken" states of the system, to the displacement field in a way…
Hydrogen-bond formation with the terminal oxygen atom is considered to be the basis of dioxygen molecule activation by cytochrome P450. In order to verify the effect of this hydrogen bond, we have undertaken the synthesis of a model complex: a binaphthyl-bridged porphyrin bearing hydroxy groups at suitable positions (…
Interfacial effects of nucleation inhibition and promotion were identified from the nucleation of paracetamol. Unlike the classic interfacial effects, which are caused by the change in nucleation barrier, the nonepitaxial interfacial effects are only associated with kink integration kinetics. Methylparaben inhibits nu…
Hochaktiv, zeitlich stabil und wasserresistent ist der hier vorgestellte Katalysator Mn/TiO2 für die selektive Reduktion von NO durch NH3 [Gl. (1)]. Mit ihm beträgt wie mit den analogen Cu- und Cr-haltigen Katalysatoren die Ausbeute an N2 bei Temperaturen ≤120°C bereits 100 %. Die Lewis-Acidität, die Redoxeigenschafte…
Ab durch die Mitte: Cyclische D,L-α-Peptide ordnen sich in Lipiddoppelschichten zu membrandurchspannenden Ionenkanälen an, die einen effizienten Transport von Glutaminsäure ermöglichen (siehe Bild). Der Molekültransport ist größen- und formselektiv, wie die hohen Transportgeschwindigkeiten zeigen, die nur mit den küns…
A liquid-crystal (LC) photoalignment method, based on the use of low-molecular-weight photo-cross-linkable (LMWPC) composites is proposed. The basic idea of this method is that cross linking or both cross linking and polymerization of LMWPC composites are realized immediately on the substrate simultaneously with the p…
We present an electrical transport study of the two-dimensional (2D) organic conductor $\ensuremath{\tau}\ensuremath{-}[\mathrm{P}\ensuremath{-}(S,S)\ensuremath{-}\mathrm{DMEDT}\ensuremath{-}\mathrm{TTF}{]}_{2}({\mathrm{AuBr}}_{2})$ $({\mathrm{AuBr}}_{2}{)}_{y}$ (where $y\ensuremath{\sim}0.75)$ at low temperatures and…
Glacial phase clustering and growth in triphenyl phosphite is observed in the temperature interval of 210 K to 214 K by small angle neutron scattering performed at the NIST Center for Neutron Research. Presented are the radius, volume fraction, and polydispersity of clusters of glacial phase surrounded by a supercoole…
Assuming the sample to consist of ferromagnetic metallic (FMM) particles with a volume fraction (f ) randomly distributed over the paramagnetic insulating background, Monte Carlo simulations of electrical conductivity show excellent fits to the data measured in (La1−xYx)2/3Ca1/3MnO3 (x=0, 0.1 and 0.2). We find that th…
A universal expression of localization lengths for all metallic carbon nanotubes has been found. Our results indicate that all types of metallic nanotubes behave as molecular quantum wires, which can be explained by a new microscopic mechanism for it. We have shown that the micron-sized localization lengths in them st…
Gleich zwei Synthesewege zu den ersten Tetrathiafulvalen-anellierten Porphyrinen wurden entwickelt. Diese neuartigen Verbindungen (siehe Bild; Pe=Pentyl) wurden durch verschiedenste Methoden charakterisiert, darunter EPR-Spektroskopie, Cyclovoltammetrie und Massenspektrometrie. Weitere Untersuchungen durch Röntgenbeug…
Hydrogenated amorphous carbon films were deposited with and without hydrogen gas dilution in a small dc bias-assisted plasma chemical vapor deposition system. The field emission characteristics were investigated and compared. It was found that the vacuum electron emission with a very low turn-on electric field (∼0.5 V…
Abstract The frequency‐dependent conductivity of interpenetrating polymer network composites of polypyrrole (PPy) and poly(vinyl acetate) (PVAc) synthesized by FeCl 3 ‐impregnated PVAc films being dipped into solutions of pyrrole in water was investigated over a frequency range of 100 Hz to 2 MHz and a temperature ran…
Two moieties of mono- and trimethincyanines as well as those of styryl dyes were connected by a saturated alkyl tether made from compounds 3a-c, 5, 7, and 9a,b. In most cases, cyclic voltammetry and spectroelectrochemistry for these dyes together with the data for their monomeric models 4, 6, 8, and 10 reveal electroc…
The effects of the hydrodynamic interactions on the short-time dynamics of colloidal, hard-sphere-like particles confined between two parallel walls are measured by digital videomicroscopy. We find that such effects can be described in terms of an effective two-dimensional hydrodynamic function H(k), defined as a stra…
Abstract The effect of crystallization from the glassy state (cold crystallization) on the oxygen‐barrier properties of copolyesters based on ethylene terephthalate with up to 10 mol % isophthalate, phthalate, or naphthalate was examined. Generally, crystallization affected diffusivity D more than solubility S; thus,…