Materials Literature
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A new technique is described for specific recognition of protein analytes by observing protein-induced changes in the drying/crystallization patterns (DCP) of an array of microdroplets containing solutions of different reporter substances. Recognition is based on a difference in interaction of the protein analyte crys…
In this work, hydrogen absorption in a LaNi5-H2 reactor is investigated experimentally and numerically. Experimental measurements were carried out on a cylindrical metal-hydride reactor filled with LaNi5 alloy. During the experiments hydrogen was charged at a constant pressure. The performance of the reactor during hy…
The polymerization of polymide6/montmorillonite (MMT) nanocomposites in a twin-screw reactive extruder is introduced in this article. Samples with different amount, of montmorillonite were measured and characterized by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The results indicate that the c…
The development of patterned surfaces for liquid crystal (LC) alignment has attracted much attention because it is applicable to bistable displays allowing the complete control of LC alignment. In this work we propose a method of preparing patterned substrates for LC alignment combining two surface treatments that lea…
Ein selbstorganisierter Film aus Bornitridnanoröhren-Polyanilin(BNNT-PANI)-Kompositen wird durch eine einfache Lösungsmethode hergestellt. Wegen der starken Wechselwirkungen zwischen den Komponenten sind die BNNTs komplett durch PANI ummantelt (siehe Bild). Mechanisch beanspruchbare BNNTs könnten als stabilisierende A…
Polyelectrolyte multilayer microcapsules were used as templates to prepare monodisperse poly(ethylene glycol) (PEG) hydrogel microspheres, which can react with amine-bearing molecules.
We have fabricated near-infrared electroluminescent (EL) devices utilizing single-wall carbon nanotubes (SWNTs) finely dispersed in a polymer, such as poly[2-methoxy-5-(2′-ethylhexyloxy]-1,4-phenylenevinylene (MEHPPV). Al/SWNT-MEHPPV/indium tin oxide thin-film devices exhibit a very promising EL response over a broad…
We investigated the retention behavior of Pb(Zr,Ti)O3 (PZT) capacitors with Ir∕SrRuO3 (SRO) top electrodes. The capacitors with Pt and Ir∕IrO2 top electrodes were also prepared for comparison. The opposite state retention characteristic of the PZT capacitor was significantly improved by using an Ir∕SRO top electrode s…
CaCu 3 Ti 4 O 12 (CCTO) film is attractive for microelectronic device applications due to its high dielectric constant. However, its dielectric loss has to be lowered. In this study, a thin layer SiO 2 was inserted into the CCTO films prepared on Pt/Ti/SiO 2 /Si substrates by the pulsed laser deposition method, in an…
Liganden, die sich winden: In Einklang mit thermodynamischen Rechnungen liegt das Tripelhelicat [Ln4L3]12+ mit vier Lanthanoidionen (siehe Bild) – trotz seiner hohen positiven Ladung – bei millimolaren Konzentrationen in Lösung als Hauptspezies vor. Für den Europiumkomplex wurde diese nanometergroße tripelhelicale Str…
Aligned micro-sized carbon tubes have been successfully synthesized on silicon substrate by pyrolysis of cyclohexane/ferrocene in the presence of water, a spectacular feature of which is that the multi-wall carbon nanotubes formed in situ act as the basic building blocks for the construction of micro-tubes via a "mult…
[reaction: see text] The syntheses of three new 2,2'-bipyridinium tetrafluoroborate sensitizers are reported. Their preliminary electrochemical and photophysical properties are compared to the properties of the more widely used pyrylium cation sensitizers. In addition, the first examples of triplet-triplet absorption…
We present a novel model system for nanoparticle electrocatalysts. A surface consisting of alternating (100) and (111) facets, several nanometers across and nearly 1 microm long, were self-assembled by annealing Pt single crystal surfaces initially cut at the midpoint between [111] and [100] directions, i.e., Pt(1+ sq…
High pressure Raman experiments were performed on the model system of double-wall carbon nanotubes. Changes in the resonance Raman profile of the radial breathing modes provide a unique demonstration of the inner tubes' band gap reduction with pressure. The overall trend of the internal tubes' normalized mode pressure…
The glass-forming reactions between sodium carbonate (Na2CO3) and silica (SiO2) have been investigated by 23Na, 29Si, and 13C magic-angle spinning (MAS) NMR spectroscopy. The multinuclear MAS NMR approach identifies and quantifies reaction products and intermediates, both glassy and crystalline. A series of powdered b…
Nematic liquid crystals are well modeled as a fluid of rigid rods. Starting from this model, we use a Poisson-bracket formalism to derive the equations governing the dynamics of nematic liquid crystals. We treat the spin angular momentum density arising from the rotation of constituent molecules about their centers of…
Caught in the net: A series of mixed copper(I)–silver(i) cyanide complexes of the form A[Ag2Cu(CN)4] (A=K, Rb, Cs) have been found to form interpenetrating layer structures and three-dimensional networks (see picture). Two different forms of the Rb and Cs compounds are observed, which are both topological isomers and…
The effect of confinement on the phase changes and dynamics of acetonitrile in mesoporous MCM-41 was studied by use of adsorption, FT-IR, DSC, and quasi-elastic neutron scattering (QENS) measurements. Acetonitrile molecules in a monolayer interact strongly with surface hydroxyls to be registered and perturb the triple…
The discovery of the fullerene molecule C60by Kroto, Heath, and Smalley in 1985 and the subsequent discovery of carbon nanotubes by Iijima in 1991 have launched entirely new fields of materials research and development. Carbon nanotubes are single molecules that can extend to lengths approaching 0.01 mm, and they are…
Bänderspiele: Lange Alkylketten werden durch Reaktion von Stearoylchlorid mit den Aminogruppen von Bornitridnanoröhren (BNNTs) an die BNNTs gebunden. Die funktionalisierten BNNTs (siehe Bild) sind in vielen organischen Solventien löslich. Kathodolumineszenz- und UV/Vis-Absorptionsexperimente deuten an, dass die langen…