Materials Literature
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Ein quaternäres Amphiphil bildet eine neue komplexe Flüssigkristallphase, in der periodisch angeordnete drei- und sechseckige Zylinder mit Kohlenwasserstoff- bzw. fluorierten Ketten gefüllt sind. Somit entsteht eine Fluidstruktur mit nanoskaligen Kammern und Kagome-Geometrie. Die Dicke der Wände zwischen den Kammern e…
Abstract Self‐organizing structures of nanometer size are observed on the surface of CdZnTe crystal irradiated by strongly absorbed Nd:YAG laser radiation (LR) at intensities within 4–12 MW/cm 2 . The effect of exciton quantum confinement manifested by a shift to higher energies of the A 0 ,X exciton band of the photo…
Abstract Free‐standing films of polypyrrole doped with p ‐toluene sulfonate (PPy/pTS) were electropolymerized galvanostatically at different deposition current densities and their electrochemomechanical deformation (ECMD) properties were measured in situ during cyclic voltammetry experiments. It was found that films e…
Escherichia coli is exposed to wide extracellular concentrations of Ca2+, whereas the cytosolic levels of the ion are subject to stringent control and are implicated in many physiological functions. The present study shows that extracellular Ca2+ controls cPHB [complexed poly-(R)-3-hydroxybutyrate] biosynthesis throug…
In the present work the role played by the instrumental resolution function in elastic incoherent neutron scattering (EINS) experiment is discussed. An important result consists in the definition of an equivalent time t(*), which depends both on the characteristic system time and on the resolution time, for which the…
Large Au nanoparticles with an average size of approximately 10 nm supported on inert SiO(2) become active in low-temperature CO oxidation after the addition of NaNO(3). The catalyst structures have been characterized in detail by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, a…
The safety assessment of geological repositories for high-level nuclear waste and spent nuclear fuel requires an understanding of the response of materials to high temperatures and intense radiation fields. Clays, such as smectite, have been proposed as backfill material around waste packages, but their response to in…
Ordered Fe nanotube arrays with an average outer diameter of 50 nm were prepared in a porous anodic aluminium oxide template using an improved sol–gel reduction approach. The morphology was studied by transmission electron and field emission scanning electron microscopes. The x-ray diffraction result shows that the na…
As a model of bacterial photosynthetic light-harvesting antenna, a large number of porphyrin units were organized into barrel-shaped macrorings. Two imidazolylporphyrinatozinc(II) molecules were linked through either unsubstituted thiophenes or 3,4-dioctylthiophenes 1 a and 1 b, respectively. These structures were spo…
A density-functional-theory investigation of bcc ${\text{B}}_{80}$ and ${\text{K}}_{6}{\text{B}}_{80}$ is presented. The calculations show that ${\text{B}}_{80}$ cages pack closely on a bcc lattice, with bond formation between atoms on both nearest-neighbor and next-nearest-neighbor molecules. While the binding energy…
Centrifugation is applied to purify single-walled carbon nanotubes (SWCNTs) grown from MCM-41 containing cobalt (Co-MCM-41) catalysts by chemical vapor deposition. We demonstrated that an optimized centrifugation force can lead to analytically pure SWCNTs. Four criteria in terms of physical and chemical properties of…
Structural control by application of ligand-stabilized nanoparticles in heterogeneous catalysis: Highly active and structurally well-defined NiPt nanocrystals can be obtained by colloidal synthesis. When deposited on suitable supports they show immediate activity without any oxidative or thermal pretreatment. The pict…
Je kleiner, desto besser: Mithilfe von In-situ-Röntgenphotoelektronenspektroskopie mit Synchrotronstrahlung unter Umgebungsdruck gelang es, den Oxidationszustand der Oberfläche von Rhodium-Nanopartikeln (NPs) während der CO-Oxidation unter O2 zu bestimmen. 2 nm große NPs oxidieren bei 150–200 °C stärker als 7 nm große…
Need a new nose? Biocompatible, highly porous monolithic scaffolds have been prepared by electron-beam-initiated free-radical polymerization and ring-opening metathesis polymerization. These scaffolds can be used for the in vitro construction of equivalents to bone and fatty tissue. Thus, autologous stem cells have be…
Two dithienylpyrroles based on azo dyes, namely 2,5′-dimethyl-[4-(2,5-di-thiophen-2-yl-pyrrol-1-yl)-phenyl]azobenzene (SNS-AB2) and 2,5′-dimethyloxy-[4-(2,5-di-thiophen-2-yl-pyrrol-1-yl)-phenyl]azobenzene (SNS-AB3), were synthesized and their corresponding polymers (PSNS-AB2 and PSNS-AB3) were successfully obtained vi…
Ultraviolet laser excited surface-enhanced Raman scattering (UV−SERS) was obtained on platinum and palladium surfaces using adenine and SCN − as the probe molecules. Diverse Pt and Pd nanoparticles, i.e., Pt nanospheres, Pt nanocubes, and Au core Pt or Pd shell nanoparticles with different shell thicknesses, were synt…
Miscibility and intermolecular interactions of novel blends of poly(N-vinyl-2-pyrrolidone) (PVP) and acid functional polyester resins (APE) were studied by use of Differential Scanning Calorimetry (DSC), Attenuated Total Reflectance Fourier Transform Infrared (ATR-FTIR), Cross-Polarization Magic Angle Spinning (CPMAS)…
The crystal structures of KMn(4)(PO(4))(3) and KCo(4)(PO(4))(3) have been determined by neutron diffraction at room temperature. Both compounds are orthorhombic with similar cell parameters, but they crystallize in different space groups, Pnam for the Mn phosphate and Pnnm for the Co analogue. On the basis of the meta…
This Test Guideline describes a method to assess bioaccumulation of sediment-associated chemicals in endobenthic oligochaetes worms. It applies to stable, neutral organic chemicals having log Kow values between 3.0 and 6.0, superlipophilic substances that show a log Kow of more than 6.0, or stable metallo-organic comp…
Abstract In atomized spray quenching, the spraying water is atomized into fine droplets of the size of about 20 μm by compressed air and sprayed onto a hot surface. Only single droplets touch the surface, become deformed, and transfer heat. The drops partially evaporate and then move away from the superposed airflow.…