Materials Literature
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Self-assembled morphologies of grafted Y-shaped ABC triblock copolymers are investigated using a simulated annealing method. The block copolymers are composed of two incompatible arms (A and B) and a short stem (C), with the C-stems grafted onto a flat surface. A rich array of novel morphologies is discovered. The for…
Constitutive parameters for simplified cylindrical cloaks have been developed such that epsilon(z)micro(theta) and epsilon(z)micro(r) match those of the ideal cylindrical cloak. Although they are not perfect, simplified cylindrical cloaks have been shown to inherit many of the power-bending properties of the ideal clo…
This article discusses a method for synthesizing an environmentally friendly calcium oleate detergent using vegetable oil instead of mineral oil as the raw material. Reaction conditions including the molar ratio of total lime [Ca(OH) 2 and CaO] to oleic acid, the molar ratio of Ca(OH) 2 to CaO, the carbonation tempera…
An electrically tunable wettability in a liquid crystal/ polymer composite film is demonstrated, in which liquid crystal molecules are anchored among polymer grains. The tunable wettability of the composite films originates from the reorientation of the anchored liquid-crystal molecules, which is switched by an in-pla…
Fourier transform ion cyclotron resonance mass spectrometry was employed to study the products and kinetics of gas-phase reactions of Cm + and Cm 2+; parallel studies were carried out with La +/2+, Gd +/2+ and Lu +/2+ . Reactions with oxygen-donor molecules provided estimates for the bond dissociation energies, D[M +…
Abstract Monolayer assemblies of zeolite microcrystals, polymer nanobeads and caged proteins were successfully applied to a highly ordered MgAl‐LDH monolayer by using the electrostatic attractions between the negatively charged particles and positively charged MgAl‐LDH without chemical modifications. Ultrasonication l…
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…