Abstract: EIS is used in this paper to study the effects of anodic oxidation parameters on the film’s
ability, and multi-layer equivalent circuits are proposed. The oxidation time has great effect on
porous layer, the porous layer’s impedance increases as the anodic oxidation time prolong; anodic
current density has effect on both barrier layer and porous layer, higher current density gets higher
impedance values in both barrier layer and porous layer; anodic oxidation temperature has great
effect on barrier layer, when the temperature decreases, the barrier layer’s impedance increases.
Abstract: Nanosized silica powders were synthesized via w/o emulsion method using sodium
silicate as SiO2 source under ultrasonic process. The powders were prepared under conventional
process and ultrasonic process using the same reactants at ambient temperature for 1h varying the
concentration of Na2SiO3 solution while fixing the concentration of surfactant in cyclohexane. The
particle size of the silica powder decreased with decreasing the concentration of sodium silicate
solution under both conditions, with and without ultrasounds. However, the particle size and size
distribution of the silica powder with ultrasounds were smaller and narrower than those without
ultrasounds, establishing that ultrasound treatments decrease the particle size and become narrow in
particle size distribution.
Abstract: The feasibility of bubble templating method to prepare hollow particles was tested in this
paper by passing a bubble into a silica sol. The silica sol was prepared by mixing TEOS, water,
alcohol and hydrochloric acid. To control the gel point, the reactants and their concentrations were
varied in each experiment. After the sol was prepared, an ammonia bubble was introduced into the
prepared sol through a capillary tube. With the catalysis of ammonia, the silica sol gelled on the
surface of bubble and formed a hollow gel particle. The nucleation of silica gel on the surface of
bubble was discussed in this paper.
Abstract: Hollow calcium carbonate (CaCO3) particles were synthesized by bubbling CO2 in the
solution of calcium chloride (CaCl2) with the presence of ammonia at room temperature. Hollow
calcium carbonate is a potential component to be used as pharmaceuticals, agrochemicals, and
catalysis. This paper investigated the effect of additive on the hollow structure. In this study was used
vanadate ion as additive agent. Physical characteristics of precipitate were evaluated using scanning
electron microscopy (SEM) and X-ray diffraction (XRD).
Abstract: The control of particle dispersion is essential to the fabrication of highly designed ceramics.
In this study, a direct observation technique was employed to characterize the heterocoagulation of
particles in two-component slurry. TEM observation of solidified slurry composed of alumina and
silica particles was attempted to evaluate heterocoagulation. At 10 mass% solid loading, the TEM
showed the aggregation of silica with dispersed alumina particles at acidic region. A large scale of
aggregation caused by attractive force among alumina and silica particles was observed on the TEM
images at neutral region. At basic region, the aggregation of alumina with dispersed silica particles
was observed. The measurements of zeta potential and viscosity were conducted to explain the results
of the TEM observations.
Abstract: Centrifugal sintering is a novel process for the preparation of thick films. In this process,
high gravity such as 104g is applied at high temperatures. Because of the distinctive measure of
pressing by the centrifugal force, gradient of pressure arises in the specimen, resulting in the graded
porous structure during the progress of sintering. After the sintering, highly densified thick films are
obtained. Furthermore, crack formation was suppressed by this process.
Abstract: This paper shows a very promising approach for developing the structure of grain
orientation through weak magnetic interaction of ceramics particles in a high magnetic field. Grain
oriented bismuth titanate ceramics was successfully developed through a processing in a high
magnetic field. XRD and SEM show that c-axes of particles were oriented perpendicular to the
applied magnetic field. The orientation structure developed by sintering, and the orientation factor
achieved 0.85 as determined using the Lotgering method.
Abstract: Magnesium oxide (MgO) films are utilized for the anti-plasma sputtering coating with
excellent ability of secondary electron emission in plasma display panels (PDP). These properties
are degraded by the impurities adsorbed on the film surface. Therefore, we should obtain
impurity-free surface during the PDP manufacturing process. We have synthesized whisker and
continuous film types of metal oxide using a chemical vapor deposition (CVD) method operated
under atmosphere. In this study, a temperature programmed desorption method has been applied to
detect residual species adsorbed on the surface of the present films in the ultra-high vacuum
atmosphere. The amount of water adsorption was determined by this method.
Abstract: The amount of melted slag has substantially increased due to the rapidly expanding
Chinese industry in the recent years. The exiting methods to dispose such slag bring about some
problems which hinders its utilization. In the paper, a new method, realized by high pressure jet, is
put forward to simultaneously producing fine powder and increasing cementitious activity, and the
method would be useful to a benign recycle of resources, energy and environment.
Abstract: Filtration medium is one of the most important parts of air-filtration. A Micro-filtration
membrane made by expanded poly-tetra-fluoric-ethylene (ePTFE) was introduced in the dust removal
process in our previous work. Compared with conventional fabric media, ePTFE membrane has many
advantages, such as low residual pressure drop and high efficiency of dust removal, etc., because of its
characteristics of micro-porous structure and slippery surface. More importantly, the useful life of
ePTFE membrane is longer and the operating costs are lower during the surface-filtration process. In
this paper, the residual pressure drop of the ePTFE micro-filtration membrane and conventional
needle-felts fabric filtration medium were compared. The results clearly show that the residual
pressure drop of the conventional filter medium increases after several filtration cycles, but that of the
ePTFE membrane remains constant.