Materials Literature
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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…
Incorporation of Eu3+ and Tb3+ ions into single crystals of cubic boron nitride (c-BN) has been performed by mixing these fluorides into a solvent for crystal growth of c-BN under high pressure. This method consequently brings luminous features into c-BN. The doped c-BN single crystals show no discernible structural c…
Diblockcopolymere aus dem helicalen Polypeptid Poly(γ-benzyl-L-glutamat) und Zufallsknäuelpolymeren wie Polyferrocenylsilanen gelieren in verdünnter Lösung thermoreversibel (siehe Bild). Für die Selbstorganisation der Blockcopolymere aus helicalen Polypeptiden wird ein neuartiger Mechanismus vorgeschlagen.
Device structure dependence of the recording efficiency of organic bistable molecular memory using photochromic diarylethene (DAE) was studied. Devices with a thicker memory layer showed faster current decrease, that is, shorter writing time. This was attributed to effective isomerization at the many carrier traps in…
Knowledge about the structural features underlying cold adaptation is important for designing enzymes of different industrial relevance. Vibriolysin from Antarctic bacterium strain 643 (VAB) is at present the only enzyme of the thermolysin family from an organism that thrive in extremely cold climate. In this study co…
Abstract Summary: Plasma enhanced chemical vapor deposition was used to deposit organosilicate glass (OSG) thin films from trimethylmethoxysilane, dimethyldimethoxysilane, and methyltrimethoxysilane. Depositions were performed from the pure OSG precursor, as well as from mixtures where either oxygen or hydrogen was ad…