Materials Literature
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Two octacyanometallate-based clusters, {CoII9[WV(CN)8]6.(CH3OH)24}.19H2O (1) and {CoII9[MoV(CN)8]6.(CH3OH)24}.4CH3OH.16H2O (2), have been synthesized. Both complexes show the single-molecule magnet behavior.
The oxygen-exchange behavior has been studied in half-doped manganese and cobalt perovskite oxides. We have found that the oxygen diffusivity in Gd0.5Ba0.5MnO3−δ can be enhanced by orders of magnitude by inducing crystallographic ordering among lanthanide and alkali-earth ions in the A-site sublattice. Transformation…
Growing holes: With the aid of a new technique highly organized surface layers of TiO2 nanotubes that are open at one end (see picture) are formed by the anodization of titanium. The pore structure is determined by the pH gradient within the forming pore, this in turn is controlled by the electrochemical sweep rate an…
Trash content of raw cotton is a critical quality attribute. Therefore, accurate trash assessment is crucial for evaluating cotton’s processing and market value. Current technologies, including gravimetric and surface scanning methods, suffer from various limitations. Furthermore, worldwide, the most commonly used met…
The electrochemical synthesis in acid aqueous solution of the brown six-electron reduced β- and γ-12-tungstosilicates, abbreviated VI′, is described. Their mechanism of formation has been deduced from controlled potential electrolyses and polarographic analysis of the transformations. They are obtained by successive r…
Abstract Colquiriite‐type crystals like LiCaAlF 6 , LiSrAlF 6 , LiCaGaF 6 , and LiSrGaF 6 are interesting host crystals for Cr 3+ or Ce 3+ laser ion doping. Although the Ca compounds show interesting optical properties, the growth of these crystals is difficult due to incongruent melting. LiCaGaF 6 crystallizes with C…
Ordered YBa 2 Cu 3 O y nanowires have been fabricated by filling YBa 2 Cu 3 O y melting liquid into the pores of the anodized alumina templates. X-ray powder diffraction proves that YBa 2 Cu 3 O y nanowires crystallized in the Y-123 structure. The temperature dependence of ac susceptibility indicates a superconducting…
Abstract The effects of SEBS as a compatibilizer on the interfacial tension and rheological properties of LDPE/PS blend have been studied. Interfacial tension was measured by the breaking thread method. The measured interfacial tension of the LDPE/PS blend was 8.26 dyn/cm. It decreased rapidly with SEBS contents to 1…
The influence of interface porosity on the wetting properties of colloid-polymer mixtures is studied within density functional theory for the Asakura-Oosawa-Vrij model at the surface of a quenched hard-sphere matrix. While the porosity hardly changes the location of the transition from partial to complete wetting at c…
Abstract LiY 1‐ x Eu x F 4 ( x = 0; 0.1 nominally) crystals were obtained by a modified Bridgman‐Stockbarger technique. Europium was found to coexist in the LiYF 4 :Eu crystal in two valence states, Eu 3+ and Eu 2+ , the content of the latter being enhanced in the near‐to‐surface region. The presence of bulk divalent…
The ferroelectric properties of Bi3.15Nd0.85Ti3O12 and Bi3.25La0.75Ti3O12 thin films under applied uniaxial stress were investigated. It was observed in both films that the remnant polarization (Pr) increased with tensile stress, while it decreased with compressive stress. On the contrary, the coercive field (Ec) decr…
Silicon nitride (Si 3 N 4 ) nanowires and nanobelts have been successfully prepared via direct crystallization of amorphous Si 3 N 4 nanoparticles under high temperature in a N 2 flow. The products were characterized by X‐ray powder diffraction, scanning electron microscopy, transmission electron microscopy, high‐reso…
Abstract Evolution of stresses developing in Cu thin films during and after deposition by thermal evaporation in UHV system is studied. Thin films were deposited on 100 µm thick Si substrate at room temperature. Deposition rates for the films were changed between 0.2 Å/s and 2.0 Å/s, while the total thickness was chan…
${\mathrm{K}}_{2}{\mathrm{Bi}}_{8}{\mathrm{Se}}_{13}$ belongs to a class of complex chalcogenides that shows potential for superior thermoelectric performance. This compound forms in two distinct phases, $\ensuremath{\alpha}$ and $\ensuremath{\beta}$. The $\ensuremath{\beta}$ phase, which has several sites with mixed…
A novel method has been developed to improve protein-crystal perfection during crystallization in a high magnetic field and structural studies have been undertaken. The three-dimensional structure of orthorhombic hen egg-white (HEW) lysozyme crystals grown in a homogeneous and static magnetic field of 10 T has been de…
Abstract Luminescence of the excitons and the role of anti‐site defects, as well as the peculiarities of energy transfer to the Ce 3+ activator ions were investigated in Lu 3 Al 5 O 12 :Ce compound. The measurements of time–resolved emission spectra and decay kinetics at 9 K and 300 K under the excitation by synchrotr…
The great potential of high‐energy X‐ray diffraction to determine fine details in the atomic scale structure is discussed and illustrated with an example of a successful study on GeSe 2 glass.
Abstract The rheological behaviors of high‐impact polystyrene (HIPS) and HIPS/TiO 2 composites were investigated by use of a rheometer in the present article. HIPS exhibited a constant critical stress of the sharkskin in various temperatures, and the analysis indicated that the mechanism of sharkskin of HIPS was wall–…
We have found a new composite SnO 2 –Zn 2 SnO 4 varistor material and the effect of different content ratios of SnO 2 to Zn 2 SnO 4 on this system is investigated. The lowest breakdown voltage ( E B = 6.4 V/mm) and the highest relative dielectric constant (ε r = 1.54×10 4 ) with higher nonlinear coefficient (α = 4.5)…
Using both theory and computer simulation, we study the dewetting problem of a polymer layer grafted on a surface in a poor solvent. We find that in the regime of moderate grafting density the layer is unstable to the formation of finite-sized holes. The formation of these holes is a result of the tradeoff between min…