Abstract: Influence of steam, loading amounts of Pd (viz., 0.7, 2.1, 5.4 wt %) and other
process parameters (viz. GHSV and temperature) on methane-based MCFC anodeeffluents
over Pd-based La2O3-Al2O3 supported on honeycomb substrate have been
investigated. TGA study reveals precise temperature of decomposition of Pd-O in
catalytic combustion at high temperature. An increase in methane conversion at elevated
temperature is attributable to decomposition of PdO to Pd active phase. The XRD
analysis of spent catalysts suggests that the reflections corresponding to PdO gradually
become weaker with increase in the Pd loading. The addition of 4% water in the feed
decreases the methane conversion due to the reversible reaction of PdO with water
adduct resulting in the formation of inactive Pd(OH)2 phase. However, the methane
conversion remains unaffected and increases monotonously with 100% water
concentration in the feed.
Abstract: Mechanical processing of nanocrystalline Y2O3 and transition alumina (AlOOH) was
performed, using a Spex mixer mill under atmospheric conditions, to synthesize yttrium aluminum
garnet (YAG, Y3Al5O12) powder at lower temperature. The reaction of nanocrystalline Y2O3 with
AlOOH was activated by mechanical energy and use of fine instead of heat energy, leading to the
direct formation of pure YAG without second phases at a lower temperature, 800°C, which is
significantly lower than that required by the conventional solid-state reaction process.
Abstract: The formation of hollow zinc oxide has been studied by oxidation and subsequent
thermal treatment of nanometer-sized zinc particles using in-situ TEM. The zinc particles produced
under UHV condition were exposed to air at room temperature for 0.6 ks, which resulted in the
formation of oxide layer with thickness of 3 nm. Subsequent heating inside UHV chamber of TEM
induced the evaporation of the inner zinc, which resulted in the formation of hollow zinc oxide. The
produced hollow zinc oxide had the wurtzite structure. Based upon the vapor pressure of the inner
zinc, it seems reasonable to consider that the internal zinc vapor leaks away through the interface
between the oxide layer and the amorphous carbon film used as a supporting substrate.
Abstract: The antifungal effectiveness against rose powdery mildew using antimicrobial nanosilver
colloidal solution was investigated. Double-capsulized nanosilver was prepared by chemical
reaction of silver ion with aid of physical method, reducing agent and stabilizers. The average
diameter of nanosilver was about 1.5 nm. They were highly stable and very well dispersive in
aqueous solution. The Transmission electron microscopy and UV-vis spectrometer were used
for measurements of size analysis and their stability, respectively. The nanosilver colloidal
solution of concentration of 5000 ppm was diluted in 10 ppm of 500 kg and sprayed at large
area of 3306 m2polluted by rose powdery mildew. The white rose powdery mildew fade out
above 95 % after 2 days and was not recurred for a week. The antifungal effects were observed
by an optical microscope and photographs.
Abstract: In this study, we have successfully developed the technology to grow the nanotube
array thin films from dip-coated titania using hydrothermal method. The nanotube
array thin film strongly adhered onto the substrate, was formed in short time reaction
at 140°C. Even a self-supporting films, consisted of vertically aligned nanotube in
large part, were formed after long time reactions at 140°C with 10 μm in thickness.
The most probable formation mechanism of TiO2-based nanotube array thin films is
Abstract: Lanthanum hydroxide and oxide were prepared by the precipitation method in an aqueous
medium at room temperature. The precipitate was examined using thermal analysis, X-ray diffraction
and Scanning Electron Microscopy to investigate the phase evaluation and the thermal
transformation by decomposition. The as-precipitated powder from the precipitation method was
hexagonal La(OH)3. The lanthanum hydroxide was decomposed to oxide in two-steps as La(OH)3 →
LaOOH + H2O and 2LaOOH → La2O3 + H2O.
Abstract: In this study, two-dimensional (2D) ordered macroporous SiCN ceramics were prepared
by infiltrating sacrificial colloidal silica (SiO2) templates with the low molecular weight preceramic
polymer, polysilazane. This was followed by a thermal curing step, pyrolysis at 1250°C in a N2
atmosphere, and finally the removal of the templates by etching with diluted HF. In particular,
100large-scale monolayer silica crystals were prepared on the cleaned Si substrates by spin coating.
Two-dimensional SiCN ordered pore arrays were fabricated by a solution-dipping template strategy.
Abstract: Reflectometry technique has been successfully applied to investigate the correlation
between the porosity and optical property (refractive index) of the ordered mesoporous thin film
deposited on silicon wafer substrates. The measured optical spectra were simulated by the Effective
Medium approximation model. The reflectometry technique has been found to be appropriate for the
measurement of thickness of thin films as well as thick layer films. The mesoporous silica films
prepared from tri-block copolymer (F-127) as a surfactant and polypropylene oxide as a swelling
agent were subsequently exposed to the ammonia vapors to enhance thermal stability and shrinkage
minimization of the film that results in increased film thickness.