Materials Literature
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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…
The phase transformation and magnetic properties of nanocomposite Nd 2 Fe 14 B/α-Fe magnets with W and Co additions, according to the composition formula (1- x wt%- y wt%) Nd 8.6 Fe 85 B 6.4 + x wt% W{} + {} y wt% Co, prepared by mechanical alloying, have been systematically studied. It has been observed that separati…
Abstract The conformational characteristics, as embodied in the unperturbed mean‐square end‐to‐end distances (〈 r 2 〉 o ) and the characteristic ratios of the dimensions [ C n = 〈 r 2 〉 o /( n 〈 l 2 〉] are calculated for the para, meta, and ortho isomers of poly(ethylene phthalate)s: poly(ethylene terephthalate) (PET)…
An extensive extended x-ray absorption fine-structure (EXAFS) study at the Mn K edge of the La 1- x Ca x MnO 3 and Tb 1- x Ca x MnO 3 ( x ⩾0.5) series, as a function of temperature up to values around 600 K, has been performed. An accurate multiple-scattering analysis has been carried out; it shows that the paramagnet…
We present three-dimensional simulations of field emission through an oscillating barrier from ideally open (10,0) and (5,5) carbon nanotubes without adsorption, by using a transfer-matrix methodology. By introducing pseudopotentials for the representation of carbon atoms and by repeating periodically a basic unit of…
Nanometre-sized domains of block copolymers can be utilized as so-called nanoreactors to synthesize a variety of nanoparticles. In this nanoreactor scheme, the domain size and period of block copolymers should be expanded to incorporate nanoparticles. We investigated changes in the domain period by gold nanoparticles,…
Al 2 O 3 −SiO 2 glasses were prepared for doping with Sm 3+ ions using a sol−gel method, followed by X-ray irradiation, in which formation of the Sm 2+ ions and persistent spectral hole burning (PSHB) were investigated. The X-ray irradiation brought about hole centers in the oxygen ions bound with Al 3+ ions. And the…
Abstract The residual entropy of amorphous polyethylene (PE) at 0 K is discussed within the framework of the heat capacity ( C p ). The measured C p of the liquid was extended from the glass transition to low temperature by separately finding its three parts—the vibrational, conformational, and external contributions—…