Materials Literature
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Core/shell-structured CdSe/CdS nanoparticles were prepared by a one-pot procedure. The interface effect was studied by steady-state and time-resolved photoluminescence spectroscopy. Coherency strain across the CdSe/CdS interface is addressed to rationalize the measured optical response. The optical properties of the d…
This communication describes a highly conducting, single-component molecular material [Ag2(ophen)2] (Hophen = 1H-[1,10]phenanthrolin-2-one) based on very strong off-set pi-pi stacking interactions with an unusually short ring-to-ring distance of ca. 3.15 A between adjacent molecules and silver(I)-pi interactions with…
Highly crystalline and monodisperse In 2 O 3 nanoparticles have been prepared by thermal decomposition of In(acac) 3 in oleylamine under inert atmosphere. The particle size of In 2 O 3 can be easily manipulated by changing the experimental conditions. A weak size dependence of photoluminescence is also demonstrated. T…
Fluorescent CdTe nanocrystal–polymer transparent composites have been fabricated by a combination of aqueous synthesis of nanocrystals, styrene extraction using polymerizable surfactants, and radical polymerization of monomer mixture containing composite nanocrystals. The Figure shows the photoluminescence of transpar…
A novel nanolayer‐rolled tubular structure of Cu(OH) 2 has been grown in solution at ambient temperature and pressure. Significantly, the Cu(OH) 2 nanotubes are phase‐pure single crystallites and are arrayed uniformly on copper substrates (see Figure). The reaction conditions for the fabrication of the nanotube arrays…
Gold nanoparticles were prepared in the presence of poly(amidoamine) (PAMAM) dendrimers (generations 3.0 and 5.0) or poly(propyleneimine) (PPI) dendrimers (generations 3.0 and 4.0) with surface amino groups by laser irradiation. UV−visible absorption, dynamic light scattering, and transmission electron microscopy have…
Polycrystalline ZnO nanowires have been grown in anodic aluminum oxide templates using a dry vapor‐deposition method. The nanowires have a high aspect ratio and a uniform density of 10 10 –10 11 cm –2 over a large area (∼ 20 mm 2 ). Room‐temperature photoluminescence measurements show lasing modes between 381 and 389…
Abstract Accumulative roll‐Bonding (ARB) is a severe plastic deformation (SPD) process invented by the authors in order to fabricate ultrafine grained metallic materials. ARB is the only SPD process applicable to continuous production of bulky materials. In the process, 50 % rolled material is cut into two, stacked to…
Abstract This report highlights developments in the fields of microporous and mesoporous materials that were published mostly during the year 2002. Selected examples are provided to illustrate new zeolite structures, porous coordination materials, mesoporous solids with new compositions, controlled morphologies, and i…
Alloyed semiconductor quantum dots (cadmium selenium telluride) with both homogeneous and gradient internal structures have been prepared to achieve continuous tuning of the optical properties without changing the particle size. Our results demonstrate that composition and internal structure are two important paramete…
Titanate nanotubes were synthesized under hydrothermal conditions. The optimized synthesis (100-180 degrees C, longer than 48 h), thermal and hydrothermal stability, ion exchangeability and consequent magnetic and optical properties of the titanate nanotubes were systematically studied in this paper. First, nanotubes…
Using thermodynamic integration, we calculate free energies of the melt and the crystalline phases of a model system of C198H398 with a realistic all-atom potential. We use the Gibbs–Duhem integration scheme to calculate the melting curve over the experimentally relevant pressure range. The crystal structure and the m…
In this work the study of the ferromagnetic resonance (FMR) and of the electrical conductivity in the perovskite sample, Sr2FeMoO6, is presented. The sample has been manufactured by conventional ceramic method sintering in inert gas atmosphere. Electrical conductivity, of about 1000–1200 S/m, has been measured in the…
Al substituted CoAlxFe2−xO4 powders were fabricated using the sol-gel method, and their magnetic and structural properties were studied with thermal analysis, x-ray, neutron diffraction, Mössbauer spectroscopy, and magnetization measurements. The crystals of the samples x=0.1 and 0.2 were found to have a cubic spinel…
Magnetic and magnetoresistive properties of La 0.7- x Pr x Pb 0.3 MnO 3 perovskite polycrystalline have been systematically studied. The substitution of La ions by Pr ions causes the structural change from rhombohedral to orthorhombic and the suppression of ferromagnetism. Ferromagnetic-paramagnetic and metal–insulato…
The influence of tensile stress on hysteresis loops and the magnetomechanical effect in high-magnetostrictive Fe-rich and low-magnetostrictive Co-rich amorphous ribbons were investigated. In the as-quenched Fe-rich alloy a very complex behavior is observed, which indicates the interplay of different types of magnetiza…
The influence of nickel and gallium excess on local structure and magnetic properties of Ni–Mn–Ga alloys has been studied. Nuclear magnetic resonance experiments showed that excessive Ni occupies Mn and Ga positions. This leads to the appearance of low-frequency line from the nearest Mn55 nuclei and generation of frac…
Numerical two-dimensional field investigations in the cross section of laminated nonoriented electrical steel sheet are performed in order to verify the possibilities and limitations of the two needle-probe technique for the measurement of local magnetic flux near the cutting edge. If one of the needles approaches the…
The electronic structure of the delafossite-type compound PdCoO2 is calculated by the full potential linear muffin-tin orbital method and the magnetic property of the composition modified (defect injection introduced) compound Pd0.72Co0.68O2 was investigated. The calculation reveals that the density of states of PdCoO…
In this article, magnetization loops under mechanical stress and magnetostriction loops under quasistatic magnetic excitation conditions are discussed. In both cases, the hysteresis loops are modeled using the Preisach theory. The identification procedure of the material parameters is described. The article discusses…