Hydrogen-related optical centers in natural diamond: An update
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Solubility prediction of drugs in water-cosolvent mixtures using Abraham solvation parameters.
PURPOSE: To provide predictive cosolvency models, the Abraham solvation parameters of solutes and the solvent coefficients were combined with the Jouyban-Acree and the log-linear models. These models require two and one solubility data points to predict the solubility of drugs in water-cosolvent mixtures. Ab initio pr…
Synthesis and oxidation of Zr3Al3C5 powders
Abstract Predominantly single phase Zr 3 Al 3 C 5 powders were synthesized in an Ar atmosphere using Zr – Al intermetallics and graphite as starting materials. The reaction path of Zr 3 Al 3 C 5 synthesis was discussed based on differential scanning calorimetry and X-ray diffraction results. Lattice parameters of Zr 3…
Electrochemical Dilatometry Study on Si-Embedded Carbon Nanotube Powder Electrodes
Si-embedded carbon nanotube powders were prepared by dispersing carbon nanotubes (CNTs) and Si in the tetrahydrofuran solution containing poly(vinyl chloride) (PVC) as a dispersion agent, and then carbonizing the PVC. A better cycle performance was observed with the containing larger void volume. The origin of this fe…
2H-solid state NMR and DSC study of isobutyric acid in mesoporous silica materials
Solid state deuterium NMR has been used to study the molecular motion of d(6)-isobutyric acid (d(6)-iBA) in the pure (unconfined) state and confined in the cylindrical pores of two periodic mesoporous silica materials (MCM-41, pore size 3.3 nm and SBA-15, pore size 8 nm), and in a controlled pore glass (CPG-10-75, por…
Highly crystalline anisotropic superstructures via magnetic field induced nanoparticle assembly
A magnetic field is successfully utilized to induce the fabrication of size controllable one-dimensional (1-D) supercrystals which are composed of a highly crystalline assembly of fcc-packed cobalt nanoparticles; the anisotropy associated supercrystal magnetism is enhanced with four times higher coercivity than that o…
New synthesis of zinc tetrakis(arylethynyl)porphyrins and substituent effects on their redox chemistry
Sonogashira coupling of zinc 5,10,15,20-tetraethynylporphyrin with various phenyl iodides under mild conditions afforded good yields of the corresponding zinc porphyrins. This method is applicable to a variety of aryl iodides including meso-substituted iodoporphyrin to form a conjugated star-shaped multiporphyrin. The…
Amine-induced growth of an In 2 O 3 shell on colloidal InP nanocrystals
A simple and rapid method for the growth of an In2O3 shell on colloidal InP nanocrystals is described, increasing their fluorescence efficiency by one order of magnitude.
Creep Parameters in a Die-Cast Mg-Al-Ca Alloy
Tensile creep tests were conducted to determine the creep parameters for a die-cast Mg-Al-Ca alloy AX52 (X representing calcium) in a temperature range from 423 to 498 K. The stress exponent of the minimum creep rate, n, increases at the yield stress of the alloy, and it lowers at higher temperatures. The activation e…
Thermal sensitivity of tellurite and germanate optical fibers
The temperature coefficients of optical phase have been measured at 1536 nm wavelength for short fiber Fabry-Perot cavities of tellurite and germanate glass fibers spliced to silica fiber. The results are consistent with the thermal expansion and thermo-optic coefficients of the bulk glasses.
Preparation of graphitic carbon with high surface area and its application as an electrode material for fuel cells
Nanostructured graphitic carbon materials have wide applications. However, the synthesis of such materials with a high surface area is still a great challenge. In this study, graphitic carbon nanocages with a surface area as high as 400–800 m2 g−1 were synthesized by pyrolysis of ethanol with dissolved iron carbonyl.…
Femtosecond laser induced space-selective precipitation of nonlinear optical crystals in rare-earth-doped glasses
We report on space-selective precipitation of nonlinear optical crystals in an Er(3+)-doped BaO-TiO(2)-SiO(2) glass by using a focused femtosecond laser with 800 nm, 250 kHz and 150 fs. An intense green emission due to upconversion luminescence is observed around the focal point of the femtosecond laser beam at the in…
Modification of Surface-Oxidized Copper Alloy by Coupling of Viologens for Inhibiting Microbiologically Influenced Corrosion
Microbiologically influenced corrosion (MIC) is extremely harmful to maritime industries and to the environment. A surface modification technique was developed in this work to impart antibacterial and corrosion-inhibition properties onto the surface-oxidized alloy to inhibit MIC. Thus, 4-(chloromethyl)phenyl tricholor…
Catalytic partial oxidation of methane to synthesis gas over a ruthenium catalyst: the role of the oxidation state
The catalytic partial oxidation of methane to synthesis gas over ruthenium catalysts was investigated by thermogravimetry coupled with infrared spectroscopy (TGA-FTIR) and in situ X-ray absorption spectroscopy (XAS). It was found that the oxidation state of the catalyst influences the product formation. On oxidized ru…
Homogeneous dispersion and enhanced thermal properties of polystyrene-layered double hydroxide nanocomposites prepared by in situ reversible addition–fragmentation chain transfer (RAFT) polymerization
Polystyrene (PS)/layered double hydroxide (LDH) nanocomposites were successfully prepared by in situ reversible addition–fragmentation chain transfer (RAFT) polymerization using the multifunctional RAFT agent SBC, sodium 4-(benzodithioyl)-4-cyanopentanoic salt. The LDH layers are well dispersed in the obtained PS/LDH…
Sol-gel Synthesis of Macroporous YAG from Ionic Precursors via Phase Separation Route
Yttrium aluminum garnet, Y3Al5O12, (YAG) monoliths with well-defined macropores have been prepared from ionic precursors using the sol-gel method accompanied by phase separation. The addition of propylene oxide to the starting solution controls the gelation, while the addition of poly(ethylene oxide) induces the phase…
A novel Ir-hexaaluminate catalyst for N2O as a propellant
Aiming for designing a novel catalyst for N(2)O as a green propellant, Ir-substituted hexaaluminate, which can initiate N(2)O decomposition at 623 K and can sustain the stability at 1473 K, has been developed for the first time.
Microstructural Design of Dielectrics for Ni-MLCC with Ultra-thin Active Layers
The influence of raw BaTiO3 (BT) powder characteristics such as particle size and crystallinity on the microstructure as well as the electrical properties of X7R-type multilayer ceramic capacitors with Ni internal electrodes (Ni-MLCCs) was investigated in the BT-Ho-Mg-Mn system. For the MLCC samples, the dielectric co…
Electrically switchable and optically rewritable reflective Fresnel zone plate in dye-doped cholesteric liquid crystals
This work demonstrates a reflective Fresnel zone plate based on dye-doped cholesteric liquid crystals (DDCLC) using the photo-induced realignment technique. Illumination of a DDCLC film with a laser beam through a Fresnel-zone-plate mask yields a reflective lens with binary-amplitude structures - planar and focal coni…
GIS partial discharge quantitative measurements using UHF microstrip antenna sensors
In view of the structure characteristic and operation performance of the field gas insulation switchgear (GIS), an external ultra high frequency (UHF) sensor, a novel microstrip antenna, is designed to detect UHF partial discharge (PD) signals for the field GIS. The microstrip antenna, which receives the UHF electroma…