Materials Literature
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Evidence is presented that the well-established phenomenon of promotion of Ce0.5Zr0.5O2 reduction by suitable treatment procedures may be controlled by adjusting the conditions; and that such reduction leads to the formation of the pyrochlore structure at extremely low temperature.
UV-vis absorption, luminescence and field emission properties have been studied in pristine multiwalled carbon nanotubes (MWNTs) and MWNTs with different functionalized groups, i.e., MWNT attached with the carboxylic and hydroxyl group ( s -MWNT), MWNT attached with dodecylamine (MWNT-CONHC 12 H 25 ) and MWNT attached…
A new synthesis of benzo[1,2]oxasiloles is described, wherein an unprecedented intramolecular allylic transposition takes place probably involving a pentavalent silicon intermediate.
Abstract Stereoregular poly(methyl methacrylate) (PMMA)–silica nanocomposites were prepared using stereocomplex formation between i ‐PMMA and s ‐PMMA by an in situ method. The methodology adopted here is the simultaneous formation of organic gel and inorganic gel, the so‐called interpenetrating polymer network (IPN) f…
The sandwiched structures with a layer of amorphous silicon (a-Si) between two a-SiNx layers have been fabricated by plasma enhanced chemical vapor deposition technique. Si nanocrystal (nc-Si) layer was formed by crystallization of the a-Si layer according to the constrained crystallization principle after thermal ann…
Abstract Minority structures are considered to be defect structures that are formed during polyethylene (PE) preparation and during the crosslinking process in PE. The minority structures that play the predominant role in PE crosslinking are vinyl double bonds. Moreover, the decomposition of dicumyl peroxide in PE doe…
In order to optimize the fullerene synthesis process based on an electric arc with graphite electrodes, an experimental study using a reactor geometry optimized for plasma spectroscopy is performed to correlate the arc properties with the fullerene formation. Emission spectroscopy studies based on the use of the Swan…
Well-aligned and randomly grown multiwall nanotubes (MWNTs) fabricated by the radio-field-induced self-bias hot-filament chemical vapour deposition method demonstrate that the growth mechanisms are either 'tip growth' or 'base growth' depending on the size of the catalyst metal particles involved. The carbon nanotubes…
Poly(beta-malic acid) hydrophobic derivatives are promising polymers for biomedical and pharmaceutical applications. The objectives of the present work were to study the in vitro degradation profile of three PMLA hydrophobic derivatives and to evaluate their cytotoxicity before and after degradation. For this purpose,…
Platin-, Palladium- und Silber-Nanoröhren mit 6–7 nm Außendurchmesser wurden in einer Templatsynthese durch Reduktion der Metallsalze erhalten (siehe Bild). Die als Templat fungierenden Flüssigkristalle wurden durch 1:1-Kombination von mittleren und großen Tensidmolekülen zu hexagonal angeordneten zylindrischen Micell…
A layered phase (SmA) was observed in a novel linked disc-rod mesogen, containing a triphenylene mesogen and attached to three cyanobiphenyl moieties.
A simple bottom-up approach allows the aggregation of nanoparticles to a variety of superlattices with controlled collective properties. For example, monodisperse magnetic Fe2O3 nanocrystals (blue) and PbSe semiconductor quantum dots (red) form a binary three-dimensional AB13-type superlattice by self-assembly (see pi…
Using Al-Cu alloys, containing between 0.1 and 26 atom % Cu, deposited by magnetron sputtering and etching in sodium hydroxide solution, enrichments of copper have been developed selectively in the alloys. Rutherford backscattering spectroscopy and medium energy ion scattering quantified the enrichments and their loca…
We investigated the microscopic structure of FePtCu ternary ordered alloys from both theoretical and experimental points of view. From the theoretical viewpoint, first principles calculation was carried out based on the full-potential linear augmented plane wave method in order to obtain the electronic structure and m…
The conductivity κ of propylene carbonate-diethyl carbonate (PC-DEC) and PC-EC (ethylene carbonate) solutions of was experimentally determined at temperatures θ from 60 to −80°C and at salt molalities m from 0.2 to and solvent compositions w from 0 to 0.7 weight fraction of DEC for the former solution and from 0.3 to…
Three conducting BEDT-TTF charge-transfer salts with tris(oxalato)metallate anions have unit cells containing both[small alpha] and [small beta][double prime] donor packing motifs.
Abstract Summary: Piezoelectric properties of a chiral smectic liquid crystalline elastomer are investigated by means of dynamic electromechanical measurements. We have confirmed that the piezoelectric constant is fairly large in the chiral smectic C (SmC*) phase. A relaxation of the piezoelectric constant is observed…
Photoluminescence measurements were used to investigate the effect of atomic and molecular hydrogen on the passivation of Si nanocrystals in SiO2. Significant increases in the luminescence intensity and lifetime were found in samples coated with a thin Al layer prior to a standard anneal in molecular hydrogen. This is…
Two metastable calcium carbonate polymorphs, hemispherical vaterite and needle-like aragonite, are selectively formed at the air/water interface by the mediation of poly(ethyleneimine)(with molecular weights of 25000 and 2000, respectively) dissolved in supersaturated calcium bicarbonate solution.
An anhydrous and crystalline ruthenium oxide thin film electrode with high specific capacitance and good high rate capability was prepared by the electrostatic spray deposition technique for use in a supercapacitor electrode material. Various experimental techniques were used to observe physical, chemical, and electro…