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Volume 42, Issue 1
Displaying 1-8 of 8 articles from this issue
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Katsuo Saito2005 Volume 42 Issue 1 Pages 4-10
Published: January 10, 2005
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSNickel ultrafine particles (UFPs) produced by spraying method of nickel acetate tetrahydrate solution into an RF plasma have been characterized. Specific surface area of UFPs, Sw, depended on the liquid feeding rate, JL, and their relation was described as Sw=fJ-nL, where f and n were the constants determined experimentally. Brownian coagulation mechanism as one of UFPs formation mechanisms was discussed based on the value of index n determined from the experiments. Particle diameter of UFPs measured from TEM photographs was expressed by a log-normal distribution with the geometrical standard deviation of smaller than 2.View full abstractDownload PDF (2976K) -
Tetsuji Yamaguchi, Yasushi Azuma, Kikuo Okuyama2005 Volume 42 Issue 1 Pages 11-16
Published: January 10, 2005
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA photon correlation spectroscopy (PCS) instrument for the size measurement of nanometer-sized particles below 10nm in diameter has been developed. This instrument incorporates a correlator that utilizes a novel digital signal processing technique. The correlator uses a rapid, multi-bit, photon counting technique with correlation channels of equal time intervals. The instrument is able to measure accurate size distributions of nanometer-sized particles. The accuracy in size measurement is confirmed by using the standard particles of polystyrene latexes, gold, and silica. Almost all of the measured size distributions agreed with the values determined by image analysis using an electron microscope. Rapid measurement with PCS technique may provide a distinct advantage over other measurement techniques for nanometer-sized particles of below 10nm.View full abstractDownload PDF (3831K) -
Hiroshi Tsunakawa2005 Volume 42 Issue 1 Pages 17-23
Published: January 10, 2005
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper discusses the estimation of critical outlet diameter of a silo in a centrifugal field and the scale-up of silo from the centrifugal field to the gravitational field. A differential equation of the stresses of powder in the silo is obtained from the force balance acting on an elemental slice of powder layer in the silo. The stresses of powder are computed numerically considering the variation in the flow properties (the angle of internal friction, the angle of wall friction, the bulk density, the adhesive strength) of powder with the compression stress.
The computational results of the critical outlet diameter are in good agreement with the experimental results of the flow patterns, such as the arch, the rat hole or the funnel flow of a kaolin powder obtained by using the miniature silos with the diameter of 40mm in the centrifugal field. Furthermore, experimental results in the gravitational field agree with the computational results of the critical outlet diameter of silo in the gravitational field, which is obtained by scaling up the results in centrifugal field.View full abstractDownload PDF (791K) -
Takeshi Konno, Mikihiko Kobayashi, Mitsuru Egashira, Norio Shinya2005 Volume 42 Issue 1 Pages 24-30
Published: January 10, 2005
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA new manipulation method using a dipole electrode probe has been developed for particle assemblage. The method is able to manipulate submillimeter-sized particles. A tungsten needle, an alumina tube and a stainless tube were concentrically arranged in order inside the probe. The tip of the probe was shaped hemispherically by an insulating resin. It was found that the probe attracts both a conductive particle and a dielectric particle by applying voltage between two electrodes, i. e., the tungsten needle and the stainless tube. The particles were attracted and adhered at the tip of the probe when voltage was applied, and were released by cutting the power off. The electrostaic attractive force was estimated both by experiments and by calculation of FEM analysis at various voltages. Both the measured values and calculated values increased linearly with the square of the voltage. The experimental values are three times greater than those of calculated values. The difference may be attributed to the incompleteness in the shape of the probe model.View full abstractDownload PDF (2547K) -
Kunihiro Fukui, Mayumi Takiguchi, Tatsunori Noriyasu, Hideto Yoshida2005 Volume 42 Issue 1 Pages 31-38
Published: January 10, 2005
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper proposes a new multi-stage synthesis method of phillipsite at a high purity and an improved yield from coal fly ash and rice husk ash. Fly ashes are treated hydrothermally with NaOH solution to form aluminate ion and silicate ion and they are separated from insoluble residues of fly ash for the preparation of phillipsite. The products of phillipsite obtained from coal fly ash and rice husk ash are over 90% in purity and the adsorption performance is comparable to the artificial zeolite available on the market. Total yield of phillipsite is also improved to 35.0% from 25.0% which was attained in our previous work (Fukui, et al., J. Society of Powder Technology, Japan, 40, 497-504, 2003). It is also found that the aluminate ion concentration is higher at a higher NaOH concentration and that the generated amount of phillipsite increases with the aluminate ion concentration.View full abstractDownload PDF (900K) -
Takafumi Seto2005 Volume 42 Issue 1 Pages 39-44
Published: January 10, 2005
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (6087K) -
2005 Volume 42 Issue 1 Pages 49-50
Published: January 10, 2005
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (4734K) -
Tatsushi Matsuyama, Fumio Saito2005 Volume 42 Issue 1 Pages 51-54
Published: January 10, 2005
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (2148K)
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