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.
Materials Literature
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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…
Preparation of BaTiO3 nanocrystals using a two-phase solvothermal method
A two-phase solvothermal synthesis approach for the preparation of hydrophobic BaTiO3 nanocrystals is reported. Three organic solvents, hexadecene, toluene, and heptane were used as the oil phase and compared to each other with respect to the product quality. The BaTiO3 particles are crystalline with a mean size of 3.…
ω-Mercapto-functionalized hafnium- and zirconium-oxoclusters as nanosized building blocks for inorganic–organic hybrid materials: synthesis, characterization and photothiol-ene polymerization
Two isostructural mercapto-functionalized zirconium- and hafnium-oxoclusters [M12(μ3-O)8(μ3-OH)8(MP)24·n(MPA), MPA = HS–(CH2)2–C(O)OH; MP = HS–(CH2)2–C(O)O−; M= Zr, Hf; n = 4 for Zr, n = 5 for Hf] were prepared by reacting 3-mercaptopropionic acid with zirconium and hafnium butoxide, respectively, in an alkoxide : aci…
Synthesis and characterization of inorganic silicon oxycarbide glass thin films by reactive rf-magnetron sputtering
Silicon oxycarbide glasses have been of interest because of the potential range of properties they might exhibit through a change in carbon-to-oxygen ratio. They are metastable materials and, as such, their structures and properties are very dependent upon the synthesis method. Silicon oxycarbide bonding has been seen…
Synthesis and structure of the new complex hydride Li2BH4NH2
The structure of the new complex hydride Li(2)BH(4)NH(2), determined through Rietveld analysis of synchrotron X-ray and neutron powder diffraction data, comprises a hexagonal array of discrete (LiNH(2))(6) clusters dispersed in a LiBH(4) matrix.
Mechanism of quenching by oxygen of the excited states of ruthenium( ii ) complexes in aqueous media. Solvent isotope effect and photosensitized generation of singlet oxygen, O 2 ( 1 Δ g ), by [Ru(diimine)(CN) 4 ] 2− complex ions
In this study we report on the photophysical properties of some [RuL(CN)4](2-) complex ions where L = 2,2'-bipyridine (bpy), 5,5'-dimethyl-2,2'-bipyridine (dmb), 1,10-phenanthroline (phen), 1-ethyl-2-(2-pyridyl)benzimidazole (pbe), 2,2':6',2'''-terpyridine (tpy) and [RuL3](2+) where L = bpy or phen. Measurements were…
Magnetic polymer microspheres with polymer brushes and the immobilization of protein on the brushes
Precursor particles, monodisperse magnetic microspheres with diameter of 0.52 µm, were produced by deposition of Fe3O4 nanoparticles within crosslinked poly(acrylic acid) microspheres prepared by distillation–precipitation copolymerization. Subsequently, magnetic microspheres with atom transfer radical polymerization…
Hydrazide-based organogels and liquid crystals with columnar order
We report on the synthesis and self-assembly of a new series of compounds containing a hydrazide unit in the rigid core and three alkoxy chains with varying lengths. The compounds N-(3,4,5-cetyloxybenzoyl)-N′-(4′-nitrobenzoyl) hydrazine (C16) and N-(3,4,5-dodecyloxybenzoyl)-N′-(4′-nitrobenzoyl) hydrazine (C12) exhibit…