Journal of the Society of Powder Technology, Japan
Online ISSN : 1883-7239
Print ISSN : 0386-6157
ISSN-L : 0386-6157
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Volume 44, Issue 9
Displaying 1-10 of 10 articles from this issue
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  • The 44th Symposium on Powder Science and Technology
    Hiroyuki Kage
    2007 Volume 44 Issue 9 Pages 637
    Published: September 10, 2007
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.44.637
    JOURNAL FREE ACCESS
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  • Chemical Looping Gasification and Combustion Processes for CO2 Sequestration
    Hiroyuki Hatano, Yashizo Suzuki, Koichi Matsuoka, Shinji Fujimoto
    2007 Volume 44 Issue 9 Pages 638-644
    Published: September 10, 2007
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.44.638
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    Chemical looping gasification and combustion using lattice oxygen was proposed for carbon dioxide separation and withdrawal without energy penalty in the energy conversion process. Pretest using polyethylene showed the potentiality for the low temperature gasification lower than 873K due to the large amount of hydrogen formation during reduction of NiO as well as CO, CO2 and hydrocarbons. Quartz reactor, 20mm I. D. and 1120mm height, was used for the repeated reaction test of the NiO reduction with methane and Ni oxidation with air to confirm the function of the lattice oxygen. Carbon dioxide was observed with sufficient amount of lattice oxygen. However, carbon monoxide was generated with insufficient lattice oxygen. Hydrogen is probably generated at the same time. Decrease in the reactivity of the lattice oxygen was not observed until the reaction reaches 90 times cycles except for the minor decrease in the initial five cycles.
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  • Electrostatic Separation of a Binary Solid Mixture Using a Rotating Conical Vessel
    Yumi Honda, Kenichi Yamamoto, Hiroko Ogura, Hiroyuki Sasakawa, Masunor ...
    2007 Volume 44 Issue 9 Pages 645-652
    Published: September 10, 2007
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.44.645
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    In order to develop a simple electrostatic separator for solid mixtures, discharge rates of particles through orifices in each end-wall of a horizontal rotating conical vessel were measured for a binary mixture of polypropylene and polystyrene particles which were loaded in the vessel. Acrylic resin (PMMA), stainless steel and polypropylene were used as the end-wall materials of the conical vessel. The particle discharge rates were strongly dependent on the humidity of surrounding air, the electrification characteristics of particles againt end-wall materials (e. g., polarity of particle charge), and the axial segregation characteristics of particles in the vessel. The binary solid mixture with almost the same density could be separated effectively by using the both effects of the electrification and segregation of each component particles in the mixture during their cascading flow in the rotating conical vessel.
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  • Development and Application of Single-wire-sliding-type Friction Tester for Cosmetics
    Eiichiro Misaki, Takanori Igarashi, Yoshimune Nonomura, Akio Kashimoto ...
    2007 Volume 44 Issue 9 Pages 653-657
    Published: September 10, 2007
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.44.653
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    Pleasant feeling when using makeup cosmetics is an essential factor. Therefore, we have to pay attention to the physical properties of cosmetic powders, especially frictional property, but it is difficult to measure it without the skill of experts. We heve developed a friction tester, which measures the friction exerting on a wire when it is pulled out from the powder bed. The single-wire-sliding-type friction tester can readily measure the friction characteristic of powder while controlling the pressure acting on the bed. This tester had a high sensitivity with a good reproducibility. The frictional property of cosmetics materials like flake powder can be evaluated by the tester. For an example, we have tried to make the spray-dried powder containing Ca-LT in order to improve the rough touch of TiO2.
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  • Preparation of Thermo-sensitive Nano Capsules by Using AOT Reverse Micellar Method
    Shiro Kiyoyama, Kosuke Minamihata, Koichiro Shiomori, Hidekazu Yoshiza ...
    2007 Volume 44 Issue 9 Pages 658-663
    Published: September 10, 2007
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.44.658
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    We report on the preparation of thermo-sensitive nano capsules using AOT reverse micellar method. Poly-N-isopropyl acryl amide that is thermo-sensitive material was prepared by AOT reverse micellar method, and we coat it by in-situ polymerization of divinylbenzene. Effect of preparation conditions on the nano capsule morphology, encapsulation efficiency of core meterial and release characteristics for temperature alteration were investigated. The morphology of nano capsules was globular shape and their diameter was affected by AOT concentration and divinylbenzene concentration. The encapsulation efficiency of core material was affected by the AOT concentration, the polymerization time of poly-n-isopropyl acryl amide and the DVB concentration. The encapsulation efficiency of core material was well correlated to the encapsulation efficiency of water. The release characteristic of core material from the thermo-sensitive nano capsules was significant over the phase transition temperature of poly-n-isopropyl acryl amide. These results confirm that the preparation method of thermo-sensitive nano capsules described in the present study is a novel and effective preparation method of nano capsules.
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  • Development of Visible Light Sensitive Titanium Dioxide Loaded with Fe2O3 Nanoparticles and Evaluation of their Photocatalytic Activities
    Kazumoto Nishijima, Teruhisa Ohno
    2007 Volume 44 Issue 9 Pages 664-672
    Published: September 10, 2007
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.44.664
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    We have succeeded in preparing doped TiO2 powders after the calcinations of the mixture TiO2 and organic compounds such as urea or thiourea. In order to improve the photoactivity of the doped TiO2, we investigated the doped TiO2 loaded with Fe2O3 nanoparticles. The photoactivities of doped TiO2 loaded with Fe2O3 nanoparticles for decomposition of 2-propanol and acetaldehyde were higher than that of doped TiO2 without Fe2O3 nanoparticles. ESR analyses suggested that photoexcited electrons generated in TiO2 during photoirradiation were efficiently trapped by Fe3+ ions loaded on TiO2, which resulted in the formation of Fe2+ ions. When the doped TiO2 photocatalysts loaded with Fe2O3 nanoparticles was treated with NaBH4 and air oxidation, their photocatalytic activities were 1.5 times that of the one without the treatment of NaBH4. The improvement of photocatalytic activity was due to a decrease in diameter of Fe2O3 nanoparticles on the doped TiO2, which was supported by the results of TEM and EDX analyses.
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  • Development of a Novel Mechanoluminescent Material with Water-Resistance
    Lin Zhang, Hiroshi Yamada, Yusuke Imai, Nao Terasaki, Yoshio Adachi, K ...
    2007 Volume 44 Issue 9 Pages 673-679
    Published: September 10, 2007
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.44.673
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    Mechanoluminescence (ML) materials have attracted lots of attention due to the potential application in novel stress indicators. SrAl2O4: Eu2+ (SEAO) that exhibits green emission is a well-known ML material. However the ML performance would markedly be degraded when it is put into water environment due to a hydrolysis reaction. In this study we have synthesized a novel ML material, calcium aluminosilicate doped with europium (CaAl2Si2O8: Eu2+) using the solid state reaction process. X-ray diffraction, photoluminescence and mechanoluminescence were measured to characterize the crystallinity and optical properties. The developed ML material showed a strong resistance to water compared to SEAO. It was shown that the introduction of SiO4 tetrahedra leads to the water resistance of calcium aluminosilicate.
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  • Synthesis and Self-Assembly of Particles
    Mikio Konno, Daisuke Nagao, Yoshio Kobayashi
    2007 Volume 44 Issue 9 Pages 680-686
    Published: September 10, 2007
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.44.680
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    This review provides wet chemical synthetic methods for micrometer-sized polymer particles with low polydispersity, highly monodisperse silica particles and functional composite particles such as fluorescent polymer particles, magnetic polymer particles and magnetic silica particles. The micrometersized polymer particles were synthesized in surfactant-free polymerization with amphoteric initiator. The silica particles were prepared by Stöber method with basic catalysts such as ammonia and amine. It is found that electrostatic interaction between particles is the important factor for controlling particle size distributions in both synthetic methods. The electrostatic interaction was controlled in the preparation of functional composite particles. Affinity between the component materials in a composite particle was improved with coupling agents for both methods. Monodisperse polystyrene and silica particles in different sizes were used to fabricate two-dimensionally ordered structures of the particles. A simple dip-coating method could be applied to the fabrication of various double-layered particle arrays including a honeycomb structure of silica particles under the monolayer of hexagonally arranged polystyrene particles.
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  • Doctoral Thesis Introductions
    2007 Volume 44 Issue 9 Pages 687-688
    Published: September 10, 2007
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.44.687
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  • Report of Working Group on Advanced Grinding Operations and Processes
    Fumio Saito
    2007 Volume 44 Issue 9 Pages 689
    Published: September 10, 2007
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.44.689
    JOURNAL FREE ACCESS
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