Materials Literature
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Single-crystal CaAl2O4 fibers doped with Ce3+ or Tb3+ or double doped with Tb3+ and Ce3+ were prepared by the laser-heated pedestal-growth method. Ce3+-doped CaAl2O4 was found to have persistent phosphorescence in the blue violet lasting more than 10 h, while Tb3+-doped CaAl2O4 showed only a weak afterglow. However, l…
Although autogenous saphenous vein remains the standard for coronary and infrapopliteal bypass, many patients do not have a suitable vein. Attempts at developing a small-caliber vascular graft have failed largely due to occlusion, neointimal hyperplasia, or aneurismal degradation. We have designed and characterized a…
Aligned MWNT–PPy composite films show exceptional charge storage capacities and improved response times. The superior performance of these composites, compared to pure PPy films, is demonstrated and discussed. The Figure shows an SEM image of the fractured film cross section, illustrating the thickness of the PPy coat…
We report here synthesis of phase-pure magnetoelectric BiFeO3 thin films with controlled oxygen stoichiometry on Pt/TiO2/SiO2/Si substrate using pulsed-laser deposition technique. Saturated ferroelectric hysteresis loop has been observed in phase-pure and highly resistive BiFeO3 thin films. The dielectric response stu…
We report on the realization of wide band gap (5–6 eV), single-phase, metastable, and epitaxial MgxZn1−xO thin-film alloys grown on sapphire by pulsed laser deposition. We found that the composition, structure, and band gaps of the MgxZn1−xO thin-film alloys depend critically on the growth temperature. The structural…
We considered the trans → cis photoisomerization dynamics of the S 2 -excited azobenzene derivatives in terms of the potential energy gap between the n-π* (S 1 ) and the π-π* (S 2 ) state. The photoisomerization dynamics of trans -4-aminoazobenzene ( trans -4-AAB) which has an energy gap (3000−4000 cm -1 ) rather smal…
The specific surface area of amorphous Aerosil 200 and silica particles with 270 nm diameter prepared by the Stoeber method was investigated by a variety of experimental methods: nitrogen adsorption at 77 and 253 K; adsorption from ethanol/cyclohexane mixture; heats of wetting measurements; small-angle X-ray scatterin…
Supported transition metal oxides and vanadium-containing multi-metallic oxides were investigated to develop new catalysts for the catalytic destruction of highly toxic polychlorinated aromatic pollutants such as polychlorinated benzenes, polychlorinated dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs), and/or bipheny…
Silver nanoparticles with an average size of ∼5 nm were deposited on the surface of preformed silica submicrospheres with the aid of power ultrasound. Ultrasound irradiation of a slurry of silica submicrospheres, silver nitrate, and ammonia in an aqueous medium for 90 min under an atmosphere of argon to hydrogen (95:5…
Relationship among Wigner crystal, charge order and Mott insulator is studied by the path-integral renormalization group method for two-dimensional lattices with long-range Coulomb interaction. In contrast to Hartree-Fock results, the solid stability drastically increases with lattice commensurability. The transition…
This paper proposes a method to analyze a magnetic frequency tripler using the Preisach model. Waveforms of the triple-frequency output voltage and the input current are calculated. The calculated results are in good agreement with the measured ones under both open circuit condition and loading condition. The proposed…
Abstract Energy calibration in an Auger electron analyser has been studied using elastically backscattered primary electrons (BPEs), with a feasibility of 15 meV(σ) for the kinetic energies of 10–1200 eV in which our improved cylindrical mirror analyser (CMA) has been used. An electron gun with a special tungsten cath…
The current-voltage (I-V) characteristics of PbGa2Se4 single crystals grown by the Bridgman-Stockbarger method with a resistivity of 1010–1012 Ω cm were measured. The value of the majority carrier mobility μ=14 cm2 V−1 s−1, calculated by the differential method of analysis of I-V characteristics, makes it possible to…
We study the dynamics of the Na atoms in amorphous Na2O-4SiO2 by means of molecular dynamics computer simulations. We find that at low temperatures the preferential pathways of these atoms form a well-connected network of pockets and channels that is quickly explored by each atom. We show that even for long times the…
Tetramethylammoniumcyansulfit zersetzt sich in SO2 bei -70 °C in HCN, [(CH3)4N]+HSO4- � SO2 und [(CH3)4N+]2S2O72- �2SO2. Eine Reaktionsfolge der Zersetzung wird diskutiert. Die gebildeten Salze werden durch Infrarot- und Ramanspektroskopie sowie durch Einkristallröntgenstrukturanalyse charakterisiert. [(CH3)4N]+HSO4-…
Abstract An experimental study of the characterization melt spinning cyclopolyolefins is presented. The shear and complex viscosities were measured and the data was found to fit the Cox-Merz relation. The birefringence of the melt-spun filaments was determined and correlated with spinline stress. These were found to b…
A novel method to reduce eddy currents within the iron pole plates of a 0.3 T NdFeB MRI magnet is presented. Using an ANSYS code the effect of the eddy currents on build-up of the gradient fields is firstly investigated. Based on the simulated analysis, a couple of eddy current suppressing layers are designed to be di…
The correlation of deposition parameters with output functions when using a novel rotating cryostat (RC) system to produce magnetic materials has been investigated here. In order to do this, an orthogonal design technique was applied for magnetic material production using a resistively heated furnace. The results of o…
End amino functional groups of the hyperbranched aromatic polyamide were chemically modified with acryloyl chloride or methacryloyl chloride. Self-crosslinking reactions of the acryloyl and methacryloyl functionalized hyperbranched aromatic polyamides were carried out in the DMF solution containing AIBN at 100 'C for…
Photoluminescence of porous silicon with different nanostructure morphologies and silicon monocrystalline wafers used as substrates was studied comparatively. The photoluminescence intensity of mesoporous and nanoporous silicon was established to be related to the excitation intensity by the quadratic and linear depen…