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 34, Issue 3
Displaying 1-8 of 8 articles from this issue
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  • [title in Japanese]
    Shun-ichi MIZUKAMI
    1997 Volume 34 Issue 3 Pages 153
    Published: March 10, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.34.153
    JOURNAL FREE ACCESS
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  • The Electrostatic Force Between a Charged Dielectric Particle and a Conducting Plane
    Tatsushi MATSUYAMA, Hideo YAMAMOTO
    1997 Volume 34 Issue 3 Pages 154-159
    Published: March 10, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.34.154
    JOURNAL FREE ACCESS
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    The electrostatic force between a uniformly charged dielectric particle and a conducting plane was carefully calculated including the effect of higher-order polarizations. The potential distribution problem was solved using spherical coordinates by considering the symmetry of the image and using a re-expansion technique of the Legendre functions. On the basis of the results, the electrostatic force was calculated using the orthogonality of the Legendre terms. In this method, numerical calculations are required for each condition, such as the contact gaps and the dielectric constants of the particle. This would be avoidable if an approximate formula was available. Thus, for convenience, an approximate formula was searched for by trial and error, and Fe=Fe(d=0)/{1+(d/a)α}β was found to be a good approximation. This was the simple expansion of the contact gap dependence of the particle with a relative dielectric constant ε=1, i. e., with no effect of polarization.
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  • Production of Monodispersed TiO2 Particles by the Three-Phase Alkoxide Method
    Tomoko MIMEO, Atsushi TSUTSUMI, Kunio YOSHIDA
    1997 Volume 34 Issue 3 Pages 160-164
    Published: March 10, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.34.160
    JOURNAL FREE ACCESS
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    The production of monodispersed fine TiO2 particles by Three-Phase Alkoxide Method was examined in a three-phase reactor of titanium tetraisopropoxide (TTIP) ethanol solution by the addition of water vapor, under various operating conditions. The rate of water vapor supplied to the reactor and the flow rate of the carrier gas ranged from 0.15 to 0.36g/min and from 3600 to 6000ml/min, respectively.
    It was possible to obtain monodispersed fine TiO2 particles under almost all of the operating conditions examined. The rate of water supplied was found to affect the fractional conversion to fine TiO2 particles and the particle size of the products.
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  • The Formation of Dispersed Calcium Hydroxide Fine Particles by Alkoxide Method
    Takumi TSURUOKA, Masashi YOKOTA, Makoto SAKURAI, Atsushi TSUTSUMI, Kun ...
    1997 Volume 34 Issue 3 Pages 165-169
    Published: March 10, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.34.165
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    Ca(OH)2 particles were precipitated by hydrolysis of a Ca(OC2H5)2 solution with irradiation of ultrasonic wave. The mechanism of the formation of dispersed fine particles was studied by particle size analysis and SEM observation of the samples during the precipitation of particles. The agglomeration of Ca(OH)2 primary particles of 20-30nm in diameter takes place to produce agglomerates with a size of 10-100μm. The agglomerates were subdivided into small clusters with a size of 0.2-0.5μm by ultrasonic irradiation and were stably dispersed in ethanol for at least one month. On the other hand, the effect of stirring during ultrasonic irradiation was found to prevent the stable dispersion of fine particles.
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  • Preparation of Fine Mullite Powders with High Surface Area by Agglomeration Control of Alkoxide-derived Precursor Sol
    Hisao SUZUKI, Masanori SHIMIZU, Hidehiro KAMIYA, Minoru TAKAHASHI, Tos ...
    1997 Volume 34 Issue 3 Pages 170-175
    Published: March 10, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.34.170
    JOURNAL FREE ACCESS
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    Ultra-fine mullite precursor powders were prepared by the hydrolysis of molecular-designed Al, Si-complex alkoxide. The surface areas of the resulting mullite powders derived from sol-gel route varied depending upon the aging and/or drying condition. This was due to the different agglomeration states of their primary particles, which precipitated by the hydrolysis of the precursor solutions. A thin electrical double layer was formed on the primary particles of the solvents with low dielectric constants, and then primary particles agglomerated into coarse secondary agglomerates, leading to mullite powders with high surface areas even after high-temperature calcination. A thick electrical double layer on the primary particles resulted in the uniform packing, which formed relatively dense secondary agglomerates during drying. This resulted in the lower surface areas when solvents with high dielectric constants were used during aging. This agglomeration behavior was confirmed by pore-size distributions and the observation of SEM of the mullite powders.
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  • Bed Porosity Effect on the Values of Specific Surface Area Measured by Air Permeability and Evaluated with Carman's Equation
    Influence of Agglomerated Secondary Particles
    Egure MURATA, Takanobu FURUKAWA, Aki OKADA, Akira SUGANUMA, Tositaka H ...
    1997 Volume 34 Issue 3 Pages 176-180
    Published: March 10, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.34.176
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1997 Volume 34 Issue 3 Pages 181-187
    Published: March 10, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.34.181
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1997 Volume 34 Issue 3 Pages 188-189
    Published: March 10, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.34.188
    JOURNAL FREE ACCESS
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