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 41, Issue 8
Displaying 1-8 of 8 articles from this issue
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  • High Speed and Large Area Coating by Silica Thin Film with Self-organized Two Dimensional Macro Pores
    Shigeki Chujo, Hideshi Sasakura, Yukio Yamaguchi
    2004 Volume 41 Issue 8 Pages 566-570
    Published: August 10, 2004
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.41.566
    JOURNAL FREE ACCESS
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    Self-organized two-dimensional polystyrene spheres (PSL) were fabricated on a glass substrate by using a capillary coater. The coating speed was 100cm/min and the coating area was over 5×5cm2. The Voronoi polygon analysis was carried out for evaluating quantitatively the regularity of spheres or pores. The ratio of hexagons in all polygons, that is ordering factor; VP6, is defined as the quantitative measure of hexagonal closed-packed structures. The maximum VP6 of PSL spheres by Voronoi polygon analysis was 0.99. After the PSL spheres were completely decomposed at 400°C, the VP6 of the silica thin film with the pores was 0.98.
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  • Preparation of Bitter Taste Masked Ibuprofen Microspheres by Spherical Crystallization Technique and Their Tabletting
    Megumi Kameyama, Hiromitsu Yamamoto, Hirofumi Takeuchi, Yoshiaki Kawas ...
    2004 Volume 41 Issue 8 Pages 571-577
    Published: August 10, 2004
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.41.571
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    Bitter taste masked ibuprofen microsphere co-precipitated with enteric polymer was prepared by the spherical crystallization technique. Particle diameter of resultant microspheres could be controlled with agitation speed and feed rate of drug-polymer solution. Flowability and packability of microspheres were improved significantly compared to the original crystal. It was found that the microsphere reduced the drug releasing rate, causing the taste masking satisfactorily in vitro. Hardness of tablet of the microspheres was higher than that of the original crystal due to improved bonding of particles under compaction. Ibuprofen releasing rates from the tablets of microspheres and original crystals were very slow because no disintegration occurred during the dissolution test. By formulating a small amount of disintegrant into tablet, the microsphere tablet became disintegrable and capable of releasing the drug in a similar manner to the original microspheres, even though the original crystal tablet with disintegrant was not disintegrated.
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  • Dispersion of Agglomerated Nanoparticles by Fine Beads Mill
    Mitsugi Inkyo, Takashi Tahara
    2004 Volume 41 Issue 8 Pages 578-585
    Published: August 10, 2004
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.41.578
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    In a dispersion of agglomerated nanoparticle to primary particles by a beads mill, large-sized beads give excess impulsive power to the agglomerated nanoparticles, resulting in crushing and reagglomeration of particles. In this study, a bead mill with fine-sized beads (down to 0.03mm) was developed and the dispersion performance for agglomerated titania nanoparticles to its primary particles was investigated under various operating conditions. It is shown that the impulsive force produced by the beads during the dispersion can be controlled by varying the bead size and that the adverse effect of impulsive force on the crystallinity and the surface of particles can be suppressed. As a result, titania nanoparticles with diameter down to 20nm (close to the diameter of primary particles) and sharp size distributions can be obtained. These results suggested that the beads mill with small-sized beads can be applied in developing the nano-dispersion process for novel materials.
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  • Influence of Humidity on Binderless Granulation in a Spouted Bed
    Shigenobu Hatano, Keiko Kaneko, Yusuke Oura, Shigekatsu Mori
    2004 Volume 41 Issue 8 Pages 586-591
    Published: August 10, 2004
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.41.586
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    The binderless granulation method using a spouted bed is a method of using the adhesion force of raw powder. In order to increase the adhesion force among fine particles, the raw powder and the fluidizing gas were humidified. However, results of granulation revealed no significant effects of humidification. Humidification of raw powder did not change the behavior in the granulator. To clarify the cause, adhesion force and spatula angle of raw powders were measured. Consequently, we found that the cohesive fine powders suitable for binderless granulation formed agglomerates, while absorbing moisture within the agglomerates.
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  • Progress in Fine Grinding and Engineering Application of Mechanochemistry
    Fumio Saito
    2004 Volume 41 Issue 8 Pages 592-601
    Published: August 10, 2004
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.41.592
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  • [title in Japanese]
    Hiroshi Asaoka
    2004 Volume 41 Issue 8 Pages 611-612
    Published: August 10, 2004
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.41.611
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  • [title in Japanese]
    [in Japanese]
    2004 Volume 41 Issue 8 Pages 614
    Published: August 10, 2004
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.41.614
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  • [title in Japanese]
    [in Japanese]
    2004 Volume 41 Issue 8 Pages 615
    Published: August 10, 2004
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.41.615
    JOURNAL FREE ACCESS
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