Materials Literature
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The first hyperpolarizability of aqueous suspensions of polyphosphate stabilized CdS nanocrystals of different mean sizes and of Cd x Zn 1 - x S nanocrystals ( x = 0, 0.25, 0.75, 1) was determined by the hyper-Rayleigh scattering technique. We report the first experimental observation that the first hyperpolarizabilit…
Lipophilic guanosine derivatives are self-assembled into ribbonlike aggregates, both in the crystal state and in solution. The structure of the ribbons has been characterised by single-crystal X-ray diffraction and, in solution, by NMR spectroscopy and ESI-MS. Two different ribbons with different patterns of hydrogen…
Photochemical energy transfer of cationic porphyrins on an “anionic-type” clay (Sumecton SA) surface was investigated. Two types of complexes were formed between the cationic porphyrin and the “anionic-type” clay depending on the conditions. With the first type, the porphyrin molecules are adsorbed on both surfaces of…
Silica fibrils with a novel double stranded helical structure are prepared by sol-gel transcription of twisted bilayer ribbons formed by cationic gemini surfactants.
Progress reports are a new type of article in Advanced Engineering Materials, dealing with hot current topics, and providing readers with a critically selected overview of important progress in these fields. It is not intended that the articles be comprehensive, but rather insightful, selective, critical, opinionated,…
Fast switching redox processes in aqueous media can be obtained in poly(3,4-ethylenedioxythiophene)/poly(allylamine hydrochloride) (see Figure for chemical structure) multilayer films. Due to the intense near-infrared charge carrier transition of the oxidized form tailing through the visible region, these films provid…
X-ray absorption fine structure measurements of the Sr and La K edges of the solid solution La(1-x)SrxMnO3 reveal a consistent deviation from a random distribution of Sr at the La/Sr sites for x less than or similar to 0.3. Local structural disorder on the cation sublattice in the low-x samples is also observed to dif…
Polypropylenes with long chain branches were obtained using reactive extrusion in the presence of peroxide, a polyfunctional acrylate monomer and a co-reactant: a sulfide compound such as thiuram disulfide. By thermal decomposition, the thiuram disulfide gives two dithiocarbamate radicals. These radicals can be reacte…
We apply the density-matrix renormalization group technique to magnetic molecules in order to evaluate the low-lying energy spectrum. In particular, we investigate the giant Keplerate molecule Mo72Fe30 where 30 Fe3+ ions (spins 5/2) occupy the sites of an icosidodecahedron and interact via nearest-neighbor antiferroma…
Narrow Bi2Te3 nanowire arrays, where the individual wires are dense and parallel, have been fabricated by electrodeposition. The array–template composites have a high wire density over a large area (see Figure) and are relatively thick, which makes them ideally suited for direct incorporation into existing device stru…
By means of an analysis on evanescent waves in left-handed materials (LHM), we show that within a slab of such a medium, sandwiched between two positive refraction media, there is amplification of evanescent waves in ideal lossless, dispersiveless media; however, contrary to previous claims, this is limited to a finit…
An overview is given on lanthanide-containing liquid crystals. As such, the compounds are classified according to their chemical composition. The Schiff's base complexes, the alkanoates, and the phthalocyanines are discussed in depth. In addition, the lanthanide-containing surfactants, with emphasis on the behavior of…
Conducting polymer anodes for photovoltaic cells based on polyethylendioxythiophene (PEDOT) and its derivatives (see Figure) are reported. The results presented here show that it is feasible to use processable conducting (macro)molecular materials instead of indium tin oxide (ITO) for fabricating polymer photovoltaic…
Thermogravimetric analysis (TGA) has demonstrated that multiwalled nanotubes (MWNTs) annealed at 2200 to 2800 °C are more air stable than as-produced MWNTs, diamond, graphite, and annealed diamond. The annealed MWNTs are similar in stability to annealed graphite. Defect sites along the walls and at the ends of the raw…
Progress reports are a new type of article in Advanced Materials, dealing with the hottest current topics, and providing readers with a critically selected overview of important progress in these fields. It is not intended that the articles be comprehensive, but rather insightful, selective, critical, opinionated, and…
A green chemistry approach to nanoparticle synthesis is the exciting possibility opened up by the fungus Fusarium oxysporum. The fungus (shown in the flask on the left), when exposed to aqueous AuCl4− ions, reduces the metal ions; this leads to the extracellular formation of gold nanoparticles (shown in the flask on t…
In the processes that are used to produce single-walled nanotubes (electric arc, laser ablation, and chemical vapor deposition), the typical lengths of tangled nanotube bundles reach several tens of micrometers. We report that long nanotube strands, up to several centimeters in length, consisting of aligned single-wal…
A novel compound Nd 3 Fe 26.5 Re 2.5 was synthesized. The structure and magnetic properties of the compound were investigated by means of x-ray powder diffraction (XRD) analysis and magnetic measurements. Nd 3 Fe 26.5 Re 2.5 crystallizes in a monoclinic Nd 3 (Fe, Ti) 29 structure with space group A 2/ m . The lattice…
The crystal structure and electronic properties of δ-phase bronze Tl x V 2 O 5 , where 0.47⩽ x ⩽0.496, have been explored by means of x-ray four-circle diffraction and through measurements of lattice constants, electrical resistivity, thermoelectric power, magnetization, and electron paramagnetic resonance. The struct…
An effective thermal conductivity in layer melt crystallization was explored based on a model considering inclusions inside a crystalline layer during crystal growth, molecular diffusion of inclusions migration due to temperature gradient and heat generation due to recrystallization of inclusions in the crystalline la…