Materials Literature
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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…
The first dendrimers containing metallacarborane modules have been prepared and characterized. The acyl derivative nido -[η 5 -C 5 H 4 C(O)Cl]Co(2,3-Et 2 C 2 B 3 H 5 ) was treated with diaminobutane-dend(NH 2 ) 16 (DAB-16) and Et 3 N in CH 2 Cl 2 to give the 16- and 32-cobalt metallodendrimers DAB- dend -[NHC(O)-C 5 H…
The Fourier modal method for modelling crossed gratings is revisited in the case of symmetrical grating profiles. It is shown that when a plane wave is symmetrically incident on a grating, whose surface profile is mirror-reflection symmetric with respect to the two planes that are perpendicular to the grating plane an…
Abstract Nowadays, waste EPDM (ethylene propylene diene monomer) increasingly has been causing significant environmental problems with increasing numbers of vehicles. From the perspective of the environment and economics, recycling is the best method to treat waste materials. This study investigated waste EPDM/PP (pol…
Among the various materials currently being investigated for further development of Er 3 + -doped waveguide amplifiers (EDWAs), tellurite glasses are gaining attention because of their broad emission band around 1.5 μm. Wereport our results on the fabrication of optical waveguides in two kinds of these glasses. Tungst…
The long and the short of it: Copper(II) complexes of the pentadentate bispidine ligands exist in two isomeric forms (see structure) with bond-length differences up to 0.5 Å. The stabilization of either isomer may be achieved by a variation of the substituent at N7.
Nitrogen-atom transfer from a (nitrido)manganese(V) complex to a CrIII complex of the 5,10,15-tris(pentafluorophenyl)corrole trianion gave the stable CrV nitrido complex 1 (Ar=C6F5). In contrast, treatment of the same CrIII starting material with ammonia/sodium hypochlorite gave the CrVI analogue of 1.
Findings are given from the experimental observation of the vacuum breakdown of carbon-nanotube (CNT) field emitters on a Si tip. The CNTs were grown on the apex of a Si microtip by microwave plasma-enhanced chemical vapor deposition. The electrical contact of the CNT-Si junction was shown to be of ohmic type. A fine…