Materials Literature
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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.
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.…
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…
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…
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…
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…
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…
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.
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…
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…
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…
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.…
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…
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…
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.
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…
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…
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…
We report the synthesis and characterization of a new heptanuclear cadmium cluster complex formed within a Schiff base macrocycle and study its surprising dimerization in the solid-state and solution to form capsules.
Chemical grafting of anti-oxidant molecules with an additional hydrophobic polymer coating directly onto TiO(2) particle surfaces, using sonochemistry, is found to eliminate photocatalytic degradation enabling highly effective screening against UV radiation.