Materials Literature
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Free-standing graphite sheets with thickness less than 1nm, “carbon nanosheets,” were synthesized on a variety of substrates by radio-frequency plasma-enhanced chemical vapor deposition without any catalyst or special substrate treatment. The nanosheets consist of one to three graphene layers with a large smooth surfa…
Carbon nanotubes (CNTs) revealing metallic or semiconductive properties depending on the folding modes of the nanotube walls represent a novel class of nanowires. Different methods to separate semiconductive CNTs from conductive CNTs have been developed, and synthetic strategies to chemically modify the side walls or…
Abstract Rapid passage of titania powder as an aerosol through a plasma generated with a low power microwave torch, resulted in many changes to the powder. Some or all of the titania became spherical, its phase changed, the level of carbon impurity changed, and its surface area declined. The final state of the titania…
Abstract Lossy purely LH and generalized CRLH TL metamaterials are analyzed using both an ideal approach, assuming perfectly homogeneous media, and a lumped‐element approach, taking into account the real periodic LC configuration of artificial metastructures. The effects of losses are identified and discussed. A CRLH…
In nature there are numerous layered compounds, some of which could be curved so as to form fascinating nanoshapes with novel properties. Graphite is at present the main example of a very flexible layered structure, which is able to form cylinders (nanotubes) and cages (fullerenes), but there are others. While fullere…
Abstract Blends of styrene–butadiene rubber (SBR) and poly(ethylene‐ co ‐vinyl acetate) (EVA) with different ratios were prepared with a two‐roll mixing mill and were vulcanized by three different crosslinking systems, namely, sulfur (S), dicumyl peroxide, and a mixture consisting of S and peroxide (mixed). The vulcan…
Abstract A series of soluble novel polyesterimides was synthesized from diamines [a mixture of 2,2‐bis(4‐(4‐aminophenoxy)phenyl)propane (BAPP) with amine‐terminated polysiloxane (ATPS) in various mole ratios] and the ester‐group‐containing dianhydrides. The ester group containing dianhydrides in turn was synthesized b…
Hochreaktive Zwischenstufen treten unter bestimmten Bedingungen im hypergolen Gemisch aus Monomethylhydrazin und Distickstofftetroxid auf (siehe Bild) und führen zu einem unkontrollierten Reaktionsverhalten. Car-Parrinello-Moleküldynamiksimulationen ermöglichen einen Einblick in das komplexe Reaktionsgeschehen auf kür…
Abstract A polymeric surfactant based on carboxymethyl cellulose and alkyl poly(etheroxy) acrylate (CMC‐A9) was used in ultrasonically irradiated emulsion polymerization of styrene. Polystyrene nanoparticles (30–60 nm) with high molecular weight were prepared. Compared with the conventional emulsion polymerization, th…
Ähnlich und doch anders: Die Kristallstrukturen von sechs Alkoholsolvaten des Tris(2-picolylamin)eisen(II)-dichlorids (siehe Formel) sind bei 200 K sehr ähnlich, ihr Spin-Crossover- und Phasenumwandlungsverhalten unterscheidet sich aber deutlich. Konsequenzen dieser Beobachtung für das Kristall-Engineering werden erör…
Abstract We have successfully prepared a series of blend membranes from cellulose and soy protein isolate (SPI) in NaOH/thiourea aqueous solution by coagulating with 5 wt % H 2 SO 4 aqueous solution. The structure and properties of the membranes were characterized by Fourier transform infrared spectroscopy, ultraviole…
The structures of ${\text{Al}}_{12}\mathrm{C}$ and ${\text{Al}}_{12}{\mathrm{C}}^{\ensuremath{-}}$ clusters are studied by using the density functional theory. We find that the charging on the icosahedral ${\text{Al}}_{12}\mathrm{C}$ cluster drives the carbon atom from the center of the cluster to its surface. The opt…
Abstract The thermal behavior of an acrylic binder resin used in back coatings for textile applications was studied. The influence of the crystalline form of the fire‐retardant additive on the thermal behavior was investigated. This resin formed a carbon char during its thermal degradation, so it may be assumed that i…
Abstract Nanocomposites of nanosized CaCO 3 /polypropylene–ethylene copolymer (PPE) and nanosized CaCO 3 /PPE/styrene–butadiene–styrene (SBS) were prepared by using a two‐roll mill and a single‐screw extruder. By adding CaCO 3 nanoparticles into the PPE matrix, the toughness of the matrix substantially improved. At a…
Pt2-Hantel geclustert: Bei der Reaktion von Platinnitrat mit konzentrierter Schwefelsäure bei 350 °C bildet sich das tiefrote Oxidsulfat (NH4)Pt3O2(SO4)3, in dem sechs Pt26+-Hanteln durch Oxidionen und Sulfatgruppen zu dem Clusteranion [Pt12O8(SO4)12]4− verknüpft sind (siehe Bild). Der Grundkörper dieses Anions entspr…
The aim of this work is the production of fibers from biodegradable polymers to obtain 3D scaffolds for tissue engineering of hard tissues. The scaffolds required for this highly demanding application need to have, as well as the biological and mechanical characteristics, a high degree of porosity with suitable dimens…
The highly chemo-, regio-, and diastereoselective and stereospecific epoxidation of various allylic alcohols with only one equivalent of hydrogen peroxide in water can be efficiently catalyzed by the dinuclear peroxotungstate, K2[[W(=O)(O2)2(H2O)]2(mu-O)].2H2O (I). The catalyst is easily recycled while maintaining its…
Platinum dumbbells: The reaction of platinum nitrate with concentrated sulfuric acid at 350 °C leads to the deep red oxide–sulfate (NH4)Pt3O2(SO4)3, in which six [Pt2]6+ dumbbells are linked by oxide ions and sulfate groups to the novel cluster anion [Pt12O8(SO4)12]4− (see picture). The structure of the core of this a…
Abstract The effect of stearic acid modification on the dispersity of silica nanoparticles and the adhesion between the filler and polymer matrix with stearic acid concentration were investigated. The wettability of silica nanoparticles was improved by the addition of stearic acid. The presence of adsorbed stearic aci…
Phonons are calculated for single wall carbon nanotubes. Eigenvalues and eigenvectors are presented for armchair and zig-zag tubes. The model contains just three adjustable spring constants: two for first and second nearest neighbor directed bonds, and a third for radial bond-bending interactions. There are four low f…