Abstract: The electrical and structural properties of the mixture of Co3O4 and In2O3 were studied.
All the samples were added with 2% nanocrystalline SiO2 and sintered at 1000°C for 2 hours. The
sintered bodies of the samples were of high density and the average particle size was ~2μm. The
materials showed the NTC behavior in a wide temperature range (100-350°C). The resistivity of the
materials at room temperature decreased with increase the content of the In2O3 from 0% to 10%.
The thermistor constant (B) values and activation energy(E) were 7835, 6637, 5903K, and 0.675,
0.572, and 0.509 eV as the content of In2O3 were 0%, 5% and 10%, respectively.
Abstract: Copper is a well-known alloying element which is used to improve the resistance to
general corrosion of stainless steels. Our previous experiments show that the increase of copper
content can acquire the excellent antibacterial properties and can also increase the tendency to cold
formability of the ferritic stainless steels. However, the effect of alloying Cu on the resistance to
localized corrosion has not been clarified sufficiently. In order to understand the effect of copper on
pitting corrosion resistance of the ferritic antibacterial stainless steel, the electrochemical
experiments were carried out and the anodic polarization curves were performed in 3.5% NaCl
solution for two kinds of steels. The results reveal that the ε-Cu phase in ferrite matrix diminishes
pitting corrosion resistance of the antibacterial stainless steel in the chlorides medium. It is connected
with the poor passive behavior of the ε-Cu phase inclusions.
Abstract: In diesel engine, generally, the removal of carbon nanoparticles has been based on a
filtration system or oxidation reactor with O2 at high temperatures of above 800 °C. Recently, NO2
has been found to be a more efficient oxidant than O2 at lower temperatures in the range of 200~500
°C. Small amounts of NO2 in the range of a few hundreds of ppm by volume can promote the
continuous oxidation of carbon particulates. Thus far, experiments involving diesel PM (particulate
matter) oxidation by NO2 are only practiced as regards the soot deposited on filters or plates.
However, in aerosol state, depending on the surrounding temperature and the NO2 concentration,
the carbon nanoparticle removal rate is significantly different. Therefore, the study of nano-sized
carbon aerosol oxidation in various gas circumstances is required. In this study, the oxidation
characteristics of nano-sized carbon aerosol particles in NO2 condition are investigated.
Abstract: The clay-based ceramic was produced by adding with the bottom ash from domestic
municipal solid waste incinerator plant in Thailand. The amount of the ash up to 60 wt% was
added. The samples were dry pressed and sintered at the temperature range between 1000 and
1125°C. The presence of quartz (SiO2), anorthite sodian (Ca,Na)(Si,Al)4O8, albite (Na(Si3Al)O8)
and mullite (Al6Si2O13) was observed in the sample with the addition of the bottom ash. The
physical and mechanical properties were also presented. The sintering temperature and the ash
addition revealed the effect on the properties of the product.
Abstract: Municipal incinerator residue (MIR) was used as raw material to replace clay to
manufacture bricks. Brick specimens were substituted from 0 to 50 wt% MIR by 10 wt% increment
for clay. Clay-MIR brick specimens were fired at 800~1050°C for 2 h. Firing shrinkage, bulk density,
water absorption rate and compressive strength were investigated. Leaching procedure tests were also
conducted to characterize toxicity. Increasing MIR contents resulted in a decrease in water absorption
rate, firing shrinkage and increase in compressive strength of bricks. It was found that when brick
specimen with 50 wt% of MIR content was heat-treated at 1000°C for 2 h, a brick specimen could be
generated, which was compressive strength of 1256 kg/cm2, water absorption ratio of 6.8% and firing
shrinkage of 3.5%. This indicates that MIR is indeed suitable for the partial replacement of clay in
Abstract: Porous carbon having surface area of 792 m2g-1 was prepared from barley straw by
carbonization at 800 oC at a heating rate of 5 oCmin-1 to test the chromium (VI) adsorption from
aqueous solution. The effects of pH, contact time and equilibrium Cr (VI) concentration on the
adsorption were studied in detail. The optimum pH for Cr (VI) removal was found to be 2. The
adsorption of Cr (VI) was very rapid and equilibrium was reached within 1 h. It was interpreted in
terms of adsorption-coupled reduction mechanism. Accompanied by the decrease of Cr (VI) ion, Cr
(III) ion was slightly released in the solution. Maximum loading capacity of total chromium was
found to be 2.35 molkg-1 at pH 2.
Abstract: A new Gelatin-glutaradehyde-Poly(vinyl alcohol) bioadsorbent was synthesized by
immobilizing Poly(vinyl alcohol) onto gelatin followed by cross-linking. This technique gives the
bioadsorbent of gelatin good chemical resistance and mechanical strength. SEM and FT-IR were
conducted for characterization of the bioadsrobent. A comprehensive adsorption study of Copper(II)
removal from synthetic aqueous solution by adsorption on this bioadsorbent was conducted
regarding the effects of initial pH, time, and copper(II) initial concentration. The adsorption data
were applied to Freundlich isotherm equation and its contents were calculated. The results obtained
showed that the new absorbent has good performance for the removal of copper(II).
Abstract: In this study, immobilized nanotubular TiO2 is used to reduce toxic Cr(VI) to non toxic
Cr(III) in aqueous solution under UV irradiation. To overcome the limitation of powder TiO2, a novel
technique of immobilization based on anodization was applied and investigated under various
experimental conditions. Among the samples tested under same anodizing condition, the nanotubular
TiO2 annealed at 450 oC and 550 oC showed higher reduction efficiencies of Cr(VI). In addition, the
surface characterizations (zeta potential, XRD and SEM) of these samples proved that the Cr(VI)
reduction efficiency was higher under acidic conditions and at a lower annealing temperature.
Through this study, it was concluded that anodized TiO2 has the potential to be useful technology for
environmental remediation as well as hydrogen production in water.
Abstract: The codeposition of fine WC and Co coated WC particles from nickel Watt’s bath has
been investigated. Electroplating of Ni/WC and Ni/WC(Co) composites coating were carried out
at different current density with variation of particle size. The effect of hydrodynamic conditions of
the codeposition of Ni/WC bath has been investigated. The Guglielmi adsorption mechanism is
applied to the electroplating of the fine WC and WC(Co) in Ni matrix. The adsorption rate of
determination step is controlled by the transferal process of loose adsorption to strong adsorption.
The embedded WC concentration can be increased both by increasing electrical current density and
additional WC concentration in the bath.
Abstract: Kenaf core was tested for its ability to sorb diesel oil from the pure diesel oil bath and the
diesel oil containing water bath after extracting with diethyl ether to remove wax from fiber surface,
grinding to disrupt lumen structure and presoaking in water. Oil sorption capacity was the highest as
8.0 g/g in diethyl ether extracted fiber in oil bath, and the lowest as 1.3 g/g in water soaked kenaf core
in water bath. Diesel oil sorption capacity was much higher in oil bath than in water bath. In diethyl
ether extraction the diesel oil sorption capacity was not changed much in kenaf core, compared to that
of control. Also, even after grinding and passing through 20 mesh screen (0.86mm) the diesel oil
sorption capacity was almost same. When kenaf core was presoaked in water the oil sorption capacity
was decreased to about half of control as 1.3g/g in water bath. Grinding, extracting and water
presoaking all contributed to the changes in oil sorption capacity. The results show that if in
lignocelluloscic fiber like kenaf core the fiber structure is not disrupted during processing and the
intact lumen structure can be kept, the oil sorption capacity may not be affected much by physical and