Materials Literature
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Polyoxometalates (POMs) are a subset of metal oxides that represent a diverse range of molecular clusters with an almost unmatched range of physical properties and the ability to form dynamic structures that can range in size from the nano- to the micrometer scale. Herein we present the very latest developments from s…
Optical transmission spectra of nominally pure BaWO 4 and SrMoO 4 and doped BaWO 4 :La 3+ and SrMoO 4 :Yb 3+ crystals are measured after irradiation with a 6-MeV 5-μs pulse electron beam at room temperature. It is shown that the irradiation effect strongly depends on the crystals composition, the type, and the concent…
Salinity was the important factor that determined the composition of diatoms in the five separate wetlands of the Salt Lake Basin. Diatoms were divided into six groups with 40 taxa belonging to freshwater forms, 19 to freshwater-brackish, 21 to brackish, 9 to brackish-saline, and 16 to saline forms. Also, 45 taxa with…
Acetylation-substituted N-ethylcarbazole at the 3-position was synthesized in 80% yield using ZnCl2 as catalyst, and its corresponding functionalized bis-β-diketone compounds 2a and 2b were prepared by Claisen condensation with acceptable yields. Lanthanide complexes with the two compounds could be used as potential l…
Abstract Ethylene–(vinyl alcohol) (EVOH)/organo‐modified montmorillonite clay (OMMT) composites were prepared using commercial OMMTs with two different organo‐modifiers. The first one has polar groups, which interact with EVOH chains, whereas the second one is non‐polar. Composites with a high weight percentage of OMM…
The crystallization morphology and activation energy of fluorapatite formation in apatite-mullite glass-ceramics has been examined. A systematic change in the amount of network modifier in the base glass has demonstrated that increasing levels of network modifier cause a corresponding increase in activation energy for…
This paper reports the demonstration of microwave-assisted magnetization reversal (MAMR) in large-damping materials and the observation of a saturation effect for the enhancement in the MAMR process. The experiments were carried out on ${\text{Fe}}_{70}{\text{Co}}_{30}$ thin films. A reduction in the switching field w…
Abstract A general and facile surfactant‐assisted solvothermal route was developed for the synthesis of CoTe, Ag 2 Te/Ag, and CdTe nanostructures using the corresponding metal salt,Na 2 TeO 3 , ascorbic acid, and polyvinyl pyrrolidone (PVP) or cetyltrimethylammonium bromide (CTAB) in mixed solvents of ethanolamine and…
Abstract In this article, we report on the mass production of carbon nanotubes using a continuous production system based on a rotary tube furnace. At first, we have optimized the composition of the metallic nanoparticles. Bimetallic Fe 2 Ni and Fe 2 Co alloys exhibit higher catalytic activity than pure Fe, Co or Ni.…
The activity and stability of Au/TiO 2 catalysts depend on several different factors such as the anchoring strength of the Au particles at the TiO 2 surface, the particle sintering, and the surface mobility of individual gold atoms and/or gold particles. Au/TiO 2 catalysts can be made resistant to sintering by atomic…
While shape memory alloys (SMAs) have many actuation benefits, their frequencies are commonly restricted by slow cooling times caused by limitations in convective heat transfer. To increase the cooling speed and at the same time reduce excess power consumption from overheating, it is critical to understand the heat tr…
Synthesis methods used to produce poly(2-methoxyaniline-5-sulfonic acid) (PMAS), a water-soluble, self-doped conducting polymer, have been shown to form two distinctly different polymer fractions with molecular weights of approximately 2 kDa and 8-10 kDa. The low molecular weight (LMWT) PMAS fraction is redox inactive…
The synthesis and characterization of a Keggin-type mono-rhenium(V)-substituted polyoxotungstate are described. The dimethylammonium salt [Me2NH2]4[PW11ReVO40] was obtained as analytically pure homogeneous black-purple crystals by reacting mono-lacunary Keggin polyoxotungstate with [ReIVCl6]2- in water, followed by cr…
Crystals of La(2)Pb(SiS(4))(2), dilanthanum(III) lead(II) bis[tetrasulfidosilicate(IV)], were obtained from the La-Pb-Si-S system and structurally characterized using X-ray single-crystal diffraction. The La and Pb atoms are coordinated in bicapped trigonal prisms of S atoms, with the Si atoms in tetrahedra. An occupa…
We report on measurements and calculations of the ultrafast exciton relaxation dynamics in ZnO. Time-resolved differential reflectivity measurements of bulk ZnO were performed as a function of excitation wavelength. Bi-exponential decays of the A and B exciton states are observed with a fast (~2-5 ps scale) and a slow…
The preparation and characterization of conducting polycarbazole (PCz) hybrid films with a colorless transparency are described. They were prepared by the vacuum evaporation of tin, aluminum, or gallium onto anion-doped green-colored PCz films, or by applying gallium to the films, followed by their exposure to ambient…
The changes in crystal growth habit of electrodeposited zinc oxide with zinc nitrate concentration are explained by changes in the levels of saturation at the electrode. Three growth regimes are found between 0.5 and 50 mM. For concentrations less than 2 mM, the growth is one-dimensional. Nanorods grow by screw disloc…
Abstract Organically modified sol‐gel coatings have been investigated as potential replacements for chromate conversion treatments of an AA1050 aluminium alloy. The coatings were prepared by combination of a completely hydrolysable precursor of tetra‐ n ‐propoxyzirconium (TPOZ), with a partially hydrolysable precursor…
Abstract Multi‐walled boron nitride nanotubes were irradiated with low and medium energy argon and helium ions at room and elevated temperatures. The irradiated samples were characterized by transmission electron microscopy and Raman spectroscopy, and a comparison to the response of carbon nanotubes to irradiation was…
We present a first-principles systematic study of the electronic structure of ${\text{SiO}}_{2}$ including the crystalline polymorphs $\ensuremath{\alpha}$ quartz and $\ensuremath{\beta}$ cristobalite, and different types of disorder leading to the amorphous phase. We start from calculations within density functional…