Materials Literature
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Als Kontrastmittel mit deutlich gesteigerter Empfindlichkeit erweist sich das supramolekulare Addukt aus einer diamagnetischen Komponente mit vielen austauschbaren Protonen (Poly-L-arginin) und einem paramagnetischen Verschiebungsreagens ([Tm(Hdotp)]4−): Die Differenz der chemischen Verschiebungen zweier Ensembles aus…
Magnetostriction is typically used for actuation and its reverse effect, known as the magnetomechanical effect, for sensing. Giant magnetostrictive materials, such as Terfenol-D, are capable of producing large strains when placed in a magnetic field and changes in the magnetization on application of an applied stress.…
Extended x-ray absorption fine structure measurements have been used to characterize the low-temperature, thermally induced structural relaxation of amorphous InP. We show reductions in both chemical and structural disorder associated with homopolar and heteropolar bonding, respectively, are operative during structura…
The microstructural evolution of Mn-implanted p-type GaN has been studied using cross-sectional transmission electron microscopy. As Mn3Ga nanoclusters (3–7 nm) with a hexagonal structure were produced by annealing (⩽800 °C), the weak ferromagnetic property emerged. Higher-temperature annealing (⩾900 °C) reduced the f…
We have performed Sawyer–Tower hysteresis measurements on micron sized Pb(Zr,Ti)O3 (PZT) capacitors prepared on Pt/Ti/SiO2/Si substrates and patterned with a focused ion beam. Owing to a numerical compensating technique, we show that the increase of both linear dielectric constant εr and maximum polarization Pmax, whe…
A method based on the pulse transient hot strip (PTHS) technique is developed for studies of thermal effusivity of insulating liquids only requiring a drop-size sample. The original technique is here extended to single-sided measurements of liquids with a known solid background, using a probe calibrated against a liqu…
New grades of sintered (polycrystalline) corundum ceramics have been shown to exhibit a ballistic shielding power close to SiC/B4C composites when manufactured with a grain size of about 500 nm. It is demonstrated here that these Al<sub>2</sub>O<sub>3</sub> ceramics become transparent when their residual porosity is d…
Zeolite NaY-supported Ir 4 (CO) 12 was prepared by direct deposition onto the outside surface of the zeolite crystals and by reductive carbonylation of Ir(CO) 2 (acac) sorbed in its pores. These samples and the products of their decarbonylation and subsequent recarbonylation were characterized by infrared and extended…
Quantum-confined semiconductor nanorods are used as highly polarized nanoemitters to actively control the polarization state of microcavity photons. A wet-chemical method to tangentially align CdSe nanorods on a polymer surface is applied to a spherical R≈2λ-microcavity. The cavity emission is studied by imaging spect…
Die Vorteile von Polyelektrolyt-Mikrokapseln (Kontrolle der Aufnahme- und Freisetzungseigenschaften über pH-Wert und Ionenstärke) und anorganischen Werkstoffen (hohe mechanische Stabilität) sind in anorganisch-organischen Polyelektrolyt-Mikrokapseln vereint (siehe Syntheseschema). Weder die sphärische Form noch die Fr…
The dependence on stress of the low frequency Young's modulus and mechanical losses of unpoled ferroelectric ceramics has been studied as a function of temperature. The Young's modulus of unpoled Pb(Zr,Ti)O3 (PZT) showed a Rayleigh type dependence, analogous to the one already described for the longitudinal piezoelect…
Ein einziges Signal im Zentrum bewirkt die Freisetzung aller Endgruppen von Dendrimeren, die zwei oder mehr Generationen geeigneter Verzweigungsbausteine enthalten (siehe Schema). Eine mögliche Anwendung für derartige Systeme ist die gezielte Wirkstoff-Freisetzung, die durch krankheits- oder organspezifische Signale a…
Abstract A study of the kinetic and thermal characterization of an epoxy resin (DGEBA) polymerized with a methyl tetrahydrophthalic anhydride reinforced with montmorillonite‐layered silicates is presented. The nanoreinforcement used was compatibilized by exchanging the cations between the silicate layers with alkylamm…
Coiled carbon nanotubes exhibit excellent mechanical and electrical properties because of the combination of coil morphology and properties of nanotubes. They could have potential novel applications in nanocomposites and nano-electronic devices as well as nano-electromechanical systems. In this work, synthesis of regu…
Release 2002/2 of the Inorganic Crystal Structure Database (FIZ Karlsruhe, Germany, and Institute Laue-Langevin, Grenoble, France) contains 62 entries in space group P3(1) and ten entries in space group P3(2) for 49 different materials including eight families with two or more isostructural members. The structural cri…
Abstract Electrochemical preparation of poly(2‐bromoaniline) (PBrANI) and poly(aniline‐ co ‐2‐bromoaniline) [P(An‐ co ‐2‐BrAn)] was carried out in an acetonitrile solution containing tetrabutylammonium perchlorate (TBAP) and perchloric acid (HClO 4 ). The cyclic voltammograms during the copolymerization had many featu…
Commerically available yttrium oxide nanopowders were evaluated as starting materials for preparation of transparent materials. The objective is an yttria optical ceramic exhibiting approximately one micrometer grain size to provide increased strength and thermal shock resistance. Three vendors were selected to provid…
Using scanning nonlinear dielectric microscopy (SNDM), we measured the linear dielectric constant of a domains (c axis in the plane of the film) and c domains (c axis perpendicular to the film surface) in PbZr0.2Ti0.8O3 (PZT) thin film to confirm that the dielectric constant of the a domain is higher than that of the…
The segmental dynamics of a poly(styrene- co-p -hydroxystyrene) random copolymer [SHS, 50 wt % HS] and its amorphous, melt-miscible blends with poly(ethylene oxide) were investigated using broadband dielectric relaxation spectroscopy. The fragility of the neat copolymer was found to be close to that of polystyrene wit…
Regular model sets, describing the point positions of ideal quasicrystallographic tilings, are mathematical models of quasicrystals. An important result in mathematical diffraction theory of regular model sets, which are defined on locally compact Abelian groups, is the pure pointedness of the diffraction spectrum. We…