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 38, Issue 5
Displaying 1-9 of 9 articles from this issue
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  • [title in Japanese]
    Toyokazu Yokoyama
    2001 Volume 38 Issue 5 Pages 315
    Published: May 10, 2001
    Released on J-STAGE: July 11, 2011
    DOIhttps://doi.org/10.4164/sptj.38.315
    JOURNAL FREE ACCESS
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  • Interaction Forces between Silica Surfaces in Wet Cyclohexane
    Yoichi Kanda, Tomo Nishimura, Ko Higashitani
    2001 Volume 38 Issue 5 Pages 316-322
    Published: May 10, 2001
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.38.316
    JOURNAL FREE ACCESS
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    Interaction forces between silica surfaces in wet and dry cyclohexane are measured using atomic force microscopy. A strange (strong?) attractive force acts between the surfaces with increasing water concentration, which is much further and stronger than the van der Waals attractive force. The attractive force decreases monotonically as the approaching velocity between two surfaces increases. The following results are obtained concerning the adhesion force: i) the probability for strong adhesion force increases with water concentration, ii) a finite contact time is required for the appearance of strong adhesion force, iii) hydrophobilization of one surface brings a sharp decrease in adhesion force. These results suggest that the strong adhesion force is caused by the formation of water bridge.
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  • Release Process of Enzymes from Baker's Yeast by Disruption in Agitating Bead Mill
    Shoichi Morohashi, Tomokazu Tachibana, Noriyasu Takai, Kazuhiro Hoshin ...
    2001 Volume 38 Issue 5 Pages 323-330
    Published: May 10, 2001
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.38.323
    JOURNAL FREE ACCESS
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    Release process of enzymes from baker's yeast was investigated experimentally by using an agitating bead mill. The enzymes examined were acid phosphatase, alcohol dehydrogenase, alkaline phosphatase, and invertase. The release process of enzymes was affected significantly by operating conditions of the mill, such as the concentration of cell suspension, the agitating speed of impeller, the volume of cell suspension, and the mass of glass beads. During the disruption of baker's yeast, the release of invertase in the cell wall was the fastest, followed by acid phosphatase and alcohol dehydrogenase in the periplasm and cytoplasm, and alkaline phosphatase bound with the cell membrane was the slowest. The release rate of enzymes was directly proportional to the product of the activity of unreleased enzymes and the agitating speed of impeller. Experimental models based on the kinetics were found to describe the release process of enzymes from baker's yeast disrupted by the agitating bead mill.
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  • Grinding Aluminum Hydroxide and its Effect on Properties of Hardened Cement Material Forming Calcium Aluminate
    Miyuki Miyazaki, Makoto Kitamura, Masataka Kamitani, Junya Kano, Fumio ...
    2001 Volume 38 Issue 5 Pages 331-337
    Published: May 10, 2001
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.38.331
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    Aluminum hydroxide (gibbsite) powder was ground in air by a double rotating cylinders mill (UF mill) under two different grinding conditions: one is grinding by rotating both cylinders inversely, called Case-1, and the other grinding by rotating the inner cylinder only, called Case-2. The ground powder was mixed together with cement powders with water to form a hardened body to investigate the effect of grinding on hardened body properties. The impact energy density of balls in Case-1 is higher than that in Case-2. The reactivity of product ground in Case-1 is lower than that in Case-2, when they are compared at the same degree of amorphization for the gibbsite sample. This leads to the formation of calcium aluminate hydrate with dense phase in the hardened body prepared in the Case-1. The compressive strength of hardened body prepared in Case-1 is higher than that in Case-2. The grinding gibbsite sample in Case-1 is suitable for the product to form the hardened body with a high compressive strength.
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  • Crystallization and Densification of Cordierite Ceramics using Kaolinite as Raw Material
    Yuichi Kobayashi
    2001 Volume 38 Issue 5 Pages 338-346
    Published: May 10, 2001
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.38.338
    JOURNAL FREE ACCESS
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    The objective of this work is to find essential conditions for the formation of dense cordierite ceramics from natural raw materials, kaolin and talc powders, without addition of fusing agents such as B2O3, P2O5 or feldspar. Solid state reactions, crystallization and sintering behaviors were investigated by using elutriated kaolinite and talc powders with alumina or submicron Mg(OH)2 particles. For specimens containing kaolinite and talc with Al2O3, elutriation facilitated the thermal diffusion of MgO from decomposed talc to kaolinite, so that the sintering proceeded sufficiently at temperatures between 1000 and 1200°C. For specimens containing kaolinite and Mg(OH)2 with SiO2, decomposed magnesia disappeared completely by reacting with decomposed kaolinite to form uniform amorphous materials below 900°C. Single phase cordierite ceramics with a relative density larger than 97% were obtained by firing at 1350°C, using elutriated kaolinite and talc with boehmite sol.
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  • Separation and Sorting of Solid Waste Particles
    Shigehisa Endoh
    2001 Volume 38 Issue 5 Pages 347-354
    Published: May 10, 2001
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.38.347
    JOURNAL FREE ACCESS
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  • Comminution Energy
    Yoshiteru Kanda
    2001 Volume 38 Issue 5 Pages 355-364
    Published: May 10, 2001
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.38.355
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  • [title in Japanese]
    Masayoshi Fuji
    2001 Volume 38 Issue 5 Pages 365-369
    Published: May 10, 2001
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.38.365
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    2001 Volume 38 Issue 5 Pages 370
    Published: May 10, 2001
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.38.370
    JOURNAL FREE ACCESS
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